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Open Access Article
1 - Simulation and Dynamic-Thermal Analysis of Ceramic Disc and Brake Pad for Optimization by Finite Element Method
Navvab Gholami Ahmad Afsari Seyed Mohammad Reza Nazemosadat Mohammad Javad AfsariThe braking system in cars is directly deals with the issue of safety, and as a result, it is essential to pay attention to this matter. One of the materials used to make disc and brake pads in disc brakes is a ceramic material. This research aims to simulate and analyz MoreThe braking system in cars is directly deals with the issue of safety, and as a result, it is essential to pay attention to this matter. One of the materials used to make disc and brake pads in disc brakes is a ceramic material. This research aims to simulate and analyze the dynamic-thermal ceramic brake disc during the braking operation using the finite element method. Currently, the conventional brake disc is used in the Peugeot 206 car (domestic production), which has low efficiency in terms of life, wear, etc. Therefore, in this research, considering the significant production of Peugeot 206 car in the country, the disc and brake pads of this car have been selected, which were first modeled by Catia software, and after transferring the model to Abacus software and defining the types of ceramics and Cast iron was analyzed by finite element method. Compared the results of the Peugeot 206 ceramic brake disc and pad analysis were with the results of the standard (cast iron) discs in this car. The results showed that the maximum von Mises stress in the ceramic disc was 260.7 MPa, while the maximum von Mises stress in the cast iron disc was 293.3 MPa. The amount of heat produced in the ceramic disc during the braking action in 4 seconds was almost 84% less than the cast iron disc in the same period. Also, the results showed that the ceramic disc has a higher safety factor (1.98) than the cast iron disc (1.45). Manuscript profile -
Open Access Article
2 - Evaluation of Critical Buckling Load in FG Plate using Analytical and Finite Elements Methods
Hossein Ahmadi Rashid AMIR GHIASVAND Maziar Mahdipour Jalilian Mahdi Kazemi -
Open Access Article
3 - Determination of thermal distribution in compact substations
meisam baharvandTransformers are one of the most important components of compact substations, and the study of their magnetic and thermal behavior inside compact substations is very important. Determining the thermal distribution inside transformers is often difficult due to the geomet MoreTransformers are one of the most important components of compact substations, and the study of their magnetic and thermal behavior inside compact substations is very important. Determining the thermal distribution inside transformers is often difficult due to the geometric complexity of the transformer structure, the dependence of the properties of the materials used on the temperature, and the nonlinearity of their magnetic behavior. In the meantime, the use of numerical methods such as finite elements is an efficient method to determine the thermal distribution inside the transformer and also to determine the maximum temperature of the transformer windings. In this dissertation, using magnetic and two-dimensional thermal analysis of finite elements by Ansys software, the thermal distribution of transformer windings in normal outdoor operation conditions and also in conditions where the transformer is located inside the compact post is determined and according to The temperature difference of the maximum temperature of the coils in the two conditions determines the thermal class of the compact substation. Manuscript profile -
Open Access Article
4 - A New Numerical Study Method of Thermal Stress Distribution and Tortuosity Effectiveness in an Anode Porous Electrode for a Planar Solid Oxide Fuel Cell
I.E Fahs M Ghasemi -
Open Access Article
5 - Static Analysis and Fatigue of DHS Implants to Treatment Femoral and Intertrochanteric Neck Fractures Using Ti6Al4V and SS316 Alloys, A Finite Element Analysis
A Shokrgozar Navi S Etemadi Haghighi M Haghpanahi A Momeni -
Open Access Article
6 - Mixed-Mode Stress Intensity Factors for Surface Cracks in Functionally Graded Materials Using Enriched Finite Elements
J Sheikhi M Poorjamshidian S Peyman -
Open Access Article
7 - Mechanical Buckling Analysis of Composite Annular Sector Plate with Bean-Shaped Cut-Out using Three Dimensional Finite Element Method
H Behzad A.R Shaterzadeh M Shariyat -
Open Access Article
8 - تحلیل پایداری سد خاکی مارون توسط نرم افزار ANSYS و Geo Studio
علی دلوری نژاد هوشنگ حسونی زاده امیرعباس کمان بدست از نکات مهم طراحی، آنالیز نشست و تحلیل پایداری است که با کمک نرم افزارهای عددی پیشرفته متوازن قبل یا بعد از احداث به دست می آید. هدف مطالعه حاضر تحلیل سد خاکی توسط نرمافزار Ansys 12 در برابر عوامل تأثیرگذار بر پایداری آن صورت گرفته است. سدمورد مطالعه، سدخا More از نکات مهم طراحی، آنالیز نشست و تحلیل پایداری است که با کمک نرم افزارهای عددی پیشرفته متوازن قبل یا بعد از احداث به دست می آید. هدف مطالعه حاضر تحلیل سد خاکی توسط نرمافزار Ansys 12 در برابر عوامل تأثیرگذار بر پایداری آن صورت گرفته است. سدمورد مطالعه، سدخاکی مارون بود که این سد در 19 کیلومتری شمال بهبهان و بر رودخانه مارون احداث شده است. این سد از نوع خاکی – سنگریزه‌ای می باشد. در این تحقیق سعی شده تا پایداری سد را توسط روش المان محدود با کمک نرمافزار Ansys (civil fem) انجام داده و سپس با نتایج نرم‌افزاری همچون Geo-studio مقایسه شود. سپس به بررسی پایداری شیب‌های سد پرداخته شده و با روشهای مختلف رفتار سد شبیه سازی شده است و نتایج نسبتا یکسان درارتباط با فاکتور ایمنی و محل سطح ناپایدار به دست آمد و فاکتور ایمنی به روش بیشاپ در ansys برای بالا دست سد عدد 4.21 و در geo studio عدد 4,71 بدست آمد. در پایان با تحلیل تنش و کرنش و جابجایی مقادیر حداکثر و حداقل تنش محاسبه و مناطق دچار نشست و مناطقی که در اثر اختلاف نشست امکان ترک خوردگی در آنها وجود دارد مشخص می شود که در این قسمت هر دو نرم افزار نتایج نسبتا یکسانی ارائه دادند و میزان حداکثر جابجایی قائم در سد 5 تا 6 متر برآورد شده است. Manuscript profile -
Open Access Article
9 - Analysis and simulation of temperature distribution on the roller body during the hot rolling process
Amirheshmat Khedmati Bazkiaei Ali SozangarThe rolling industry is the most common and prosperous method of producing metal products. The first goal of the rolling process is to reduce the cross-sectional area or the thickness of the workpiece, this process is done in two ways, hot and cold rolling, the metal pa MoreThe rolling industry is the most common and prosperous method of producing metal products. The first goal of the rolling process is to reduce the cross-sectional area or the thickness of the workpiece, this process is done in two ways, hot and cold rolling, the metal passes between two rollers to take the shape of the groove (calibre) of the roller, so the rolling rollers of the components They are essential in climbing factories. This research aims to analyze heat transfer in hot rolling conditions and find the heat distribution in rolling rollers using the finite element method. The simulation is non-linear and assumes that the roller is homogeneous, isotropic, and without cracks and thermal strain. And the ambient temperature is considered negligible. The heat distribution in the roller in this research has been obtained in two ways using the spray cooling system and without using this system, and then the results obtained from the finite element simulation have been verified with the extracted experiment data, The highest percentage of relative error in prediction was 08.334%, which indicated the matching of the results obtained from the numerical solution with the extracted data. Manuscript profile -
Open Access Article
10 - Simulation of thermal stress in the hot rolling process and its effect on roller failure
Amirheshmat Khedmati Bazkiaei Ali SozangarThe rolling process is actually the shaping of steel, in which rollers are used to change the shape, improve the mechanical properties of the material, and eliminate the uniformity of the metal. Steel can be rolled in two forms, hot and cold, each of which has its chara MoreThe rolling process is actually the shaping of steel, in which rollers are used to change the shape, improve the mechanical properties of the material, and eliminate the uniformity of the metal. Steel can be rolled in two forms, hot and cold, each of which has its characteristics. The purpose of this research was to investigate the effect of thermal stress during the rolling process on the failure of rollers using finite element simulation. This construction is non-linear and it is hypothesized that the roller is isotropic, without cracks and thermal strain, and the temperature of the environment is similar to the room. In this research, the effect of basic and accurate cooling during the rolling process has also been investigated. The results obtained in six hot rolling are created according to the highest number of rollers and the number of rollers in the rollers, which is shown and the extent of the role of thermal stresses on the failure of the rollers is stated Manuscript profile -
Open Access Article
11 - Numerical modeling of soil bearing capacity coefficients under earthquake load
Pezhman Fazeli سهیل GHorehEvaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results hav MoreEvaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results have been obtained. In this research,evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finiteelements software Plaxis and the obtained results have been compared with those from other publishedstudies. Moreover, the effect of the inertia of the underpinning soil on the soil bearing capacitycoefficients was modeled in the pseudo- static mode and the results indicated that bearing capacitycoefficients obtained from pseudo-static gave good agreement with other methods. However,comparison of these two results revealed that the results obtained from numerical modeling are moreconservative and are on the safety side. Finally, since the pseudo –static load is not characterized as anappropriate alternative for the earthquake load; the effect of underpinning soil on the manner oftransferring the earthquake waves until reaching the foundation bed has been also investigated.Evaluation of soil bearing capacity coefficients of has been the focus of a significant amount of studiesby various researchers. In all conducted studies and analyses, by considering different forms ofearthquake load with pseudo-static performance, different results have been obtained. In this research,evaluation of soil bearing capacity coefficients under earthquake load has been carried out using finiteelements software Plaxis and the obtained results have been compared with those from other publishedstudies. Manuscript profile -
Open Access Article
12 - Comparison Study on Neural Networks in Damage Detection of Steel Truss Bridge
Hassan Aghabarati Mohsen Tabrizizadeh -
Open Access Article
13 - Mechanical Stability of RCSed and ECAPed Intramedullary 316L Stainless Steel Nails in the Treatment of Diaphyseal Bone Fractures
Abdolreza Rastitalab Salar Khajehpour Ahmad Afsari Shahin Heidari Javad Dehghani -
Open Access Article
14 - An Investigation of Using RCS-processed Intramedullary Stainless Steel 316L Nail in the Treatment of Diaphyseal Bone Fractures
Abdolreza Rastitalab Salar Khajehpour Ahmad Afsari Shahin Heidari Javad Dehghani -
Open Access Article
15 - Numerical analysis of the effects of a wall barrier with eco-line spheres on diverting the rupture path of a 45-degree reverse dip-slip fault
Nima Ajeli Lahiji Behnam Adhami Gholamreza Ghodrati Amiri Elham RajabiPassing through the different soil layers, earthquake-induced faulting can reach the ground surface and cause serious damage to infrastructure, especially bridge structures. Therefore, it is necessary to divert the rupture path from the vicinity of the structure using m MorePassing through the different soil layers, earthquake-induced faulting can reach the ground surface and cause serious damage to infrastructure, especially bridge structures. Therefore, it is necessary to divert the rupture path from the vicinity of the structure using modern techniques. Embedding a barrier wall on the rupture path is an efficient solution to mitigate the secondary effects of this phenomenon (such as ground surface displacements, and foundation and pier rotations). In this paper, a numerical study is carried out on a barrier wall filled with eco-line spheres near a concrete bridge foundation as a novel faulting rupture path diversion technique. Moreover, the effects of different parameters including changes in width, depth, and barrier wall-bridge foundation distance on rupture path, 45-degree reverse dip-slip fault, and changes in the vertical displacement and the rotation of the foundation have been studied. The results have shown that when the barrier wall is placed on the rupture path, it can effectively divert the waves and reduce plastic strains, soil strain energy, and ground surface deflections by up to 100 percent and mitigate structural response by up to 50 percent, hence effectively preventing damage to both the ground surface and the structure. Manuscript profile -
Open Access Article
16 - Numerical investigation of new steel connection using short stub column
Farzad Hatami mehrdad taheripour Reza RaoufiLittle evidence of the formation of plastic zones is seen in damaged structures in various earthquakes. Most of the conducted studies have focused on creating a plastic hinge in a part of the beam making irreparable damage to the beam. If the plastic joint in the beam d MoreLittle evidence of the formation of plastic zones is seen in damaged structures in various earthquakes. Most of the conducted studies have focused on creating a plastic hinge in a part of the beam making irreparable damage to the beam. If the plastic joint in the beam does not occur, a force will be created which is more than the plastic moment of the beam to be transferred to the connection and the column. This will either cause the brittle failure of the connection or damage to the panel zone of the column. Therefore, in this research, four connections with new geometry have been proposed aimed at reducing damage in beams and columns and the possibility of replacing damaged parts. In general, the proposed connections are suggested by replacing an H or I-shaped section with a companion, or instead of an end-plate, as a short stub column. In this study, first, a finite element model of the end-plate connection, which is a combination of welding and screwing, subjected to cyclic loading, was selected. Then, after the validation of Abaqus software, a study was carried out on the proposed connections. The results show that the stable region, with its nonlinear behavior, creates a controlled limited joint with extraordinary ductility. Yielding in the stub causes its fusion behavior and prevents damage to beams and columns It also significantly reduces the plastic stress and strain in the panel zone of the column. Manuscript profile -
Open Access Article
17 - The Effect of Simultaneous and Multi-Stage Explosions on the Response of Structures Buried in Soil
Saeid Firouzabadi Hadi Dashti Alireza FiouzUnderground structures are the best options to build command posts, shelters, weapons depots, important equipment, and defense industries. The manner in which a loading is caused by launch of airplane bombs on buried underground structures is among major issues on which MoreUnderground structures are the best options to build command posts, shelters, weapons depots, important equipment, and defense industries. The manner in which a loading is caused by launch of airplane bombs on buried underground structures is among major issues on which relatively few studies have been carried out, and may not be considered in design of such structures. The simultaneous and Multi-step explosions of missile launches from aircraft and drones also affect the buried structural response. Therefore, in the present study, after verifying the validity of the numerical model with a real model, a comparative study on the effect of simultaneous and multi-stage bombs on response of secure buried structures in soil was carried out using finite element method. This issue has been investigated in four cases with constant burial depth and different explosion location. The results of maximum stresses presented that, in the case of multiple-stage bombing loads, underground structures under study, in all considered situations, experienced more stress than the simultaneous explosive loading mode. The difference of these changes has been observed in some places up to about 15%. Manuscript profile -
Open Access Article
18 - Numerical investigation of the new steel connection using short stub column
mehrdad taheripour Farzad Hatami Reza RaoufiThere is little evidence of the formation of plastic zones in damagd structures in diffrent types of earthquakes. Most of the conducted studies have focused on creating a plastic hinge in a part of the beam making irreparable damage to the beam. If the plastic joi MoreThere is little evidence of the formation of plastic zones in damagd structures in diffrent types of earthquakes. Most of the conducted studies have focused on creating a plastic hinge in a part of the beam making irreparable damage to the beam. If the plastic joint in the beam does not occur, a force will be created which is more than the plastic moment of the beam and will be transferred to the connection and finally to the column. This will either cause the brittle failure of the connection or damage to the panel zone of the column. Therefore, in this research, four connections with new geometry have been proposed aimed at reducing damage in beams and columns and creating the possibility of replacing damaged parts. In general, the presented connections are suggested by replacement of an H or I-shaped cross section along with or replacing of an end-plate, as a short stub column. In this reserch, first, a finite element model of the end-plate connection, which is a combination of welding and screwing subjected to cyclic loading was selected. Then, after the validation of Abaqus software, a study was carried out on the proposed connections. The results indicate that the stub region, with its nonlinear behavior, creates a controlled limited joint with extraordinary ductility. Yielding in the stub causes its fusion behavior and prevents damage to beams and columns. It also significantly reduces the plastic stress and strain in the panel zone of the column. Manuscript profile -
Open Access Article
19 - Numerical Analysis of the Effect of a Wall barrier with Eco-line Spheres on Diverting the Faulting Path of a 45-Degree Reverse dip-slip Fault
Nima Ajeli Lahiji Behnam Adhami Gholamreza Ghodrati Amiri Elham RajabiPassing through the different soil layers, earthquake-induced faulting can reach the ground surface and cause serious damage to infrastructure, especially bridge structures. Therefore, it is necessary to divert the rupture path from the vicinity of the structure using m MorePassing through the different soil layers, earthquake-induced faulting can reach the ground surface and cause serious damage to infrastructure, especially bridge structures. Therefore, it is necessary to divert the rupture path from the vicinity of the structure using modern techniques. Embedding a barrier wall on the path of rupture propagation and in the vicinity of the structure is an efficient solution to mitigate the secondary effects of this phenomenon (such as displacement of the earth's surface, and rotation of the structure’s foundation). In this paper, a numerical study is carried out on a barrier wall filled with eco-line spheres near a concrete bridge foundation as a novel faulting path diversion technique. Moreover, the effects of different parameters including changes in width, depth, and barrier wall’s distance from bridge foundation on rupture path of the 45-degree reverse dip-slip fault, and changes in the vertical displacement and the rotation of the foundation have been studied. The results indicated that when the barrier wall is placed on the rupture path, it can effectively divert the waves and reduce plastic strains, soil strain energy, and ground surface deflections by up to 100 percent and mitigate structural response by up to 50 percent, hence effectively preventing damage to both the ground surface and the structure. Manuscript profile -
Open Access Article
20 - Experimental Study of the Effect of Laser-Cutting Process Parameters on Heat Distribution and Cutting Edge Quality of Steel Sheets
Mahsa Mokhtarian Azam Gasemi -
Open Access Article
21 - بررسی تجربی و عددی طراحـی پیش فرم در کشش عمیق چند مرحله ای ورق های نازک فولادی استحکام بالا
اکبر زمانی علیشاه مهدی تاجداری جعفر اسکندری جم جمال صیدیدر این مقاله نتایج حاصل از آزمایش تجربی فرآیند کشش عمیق در تولید یک استوانه­ی سرکروی از جنس نوعی فولاد استحکام بالا با نتایج شبیه­سازی آن و سه نوع طراحی پیش­فرم پیشنهادی (ارائه شده) مقـایسه گردید، تا ضمن سنجش میزان صـحت نتـایج و دقت نرم­افـزار اجزاء محدو Moreدر این مقاله نتایج حاصل از آزمایش تجربی فرآیند کشش عمیق در تولید یک استوانه­ی سرکروی از جنس نوعی فولاد استحکام بالا با نتایج شبیه­سازی آن و سه نوع طراحی پیش­فرم پیشنهادی (ارائه شده) مقـایسه گردید، تا ضمن سنجش میزان صـحت نتـایج و دقت نرم­افـزار اجزاء محدود در پیش­بینی فرآیند کشش­عمیق چند مرحله­ای در ورق­های نازک فولادی استحکام بالا ، مقادیر نسـبت کشـش­حـدی مـراحل مختلف کشش و بازکشش آزمون تجربی نیز بهبود یابند. برای شبیه­سازی، از نرم­افزار اجزاء ­محدود آباکوس نسخه 3-9-6 استفاده گردید. در این تحقیق، ماده­اولیه، یک لوح دایروی از ورق فولادی 4130- AISI آنیل شـده با ضخامت mm 2 می­باشـد که در بررسی تجربی طی یک مرحله کشش، سه مرحله بازکشش و دو مرحله عملیات حرارتی آنیل به استوانه­ای با سر کروی تبدیل شد. برای معرفی خواص مکانیکی این فولاد آزمایش کشش تک محوری انجام و از نتایج آن استفاده گردید. مقایسه نتایج توزیع ضخامت در نرم­افزار اجزاء ­محدود با ضخامت‎های اندازه­گیری شده در پیرامون قطعات تولیدی در مراحل مختلف کشش و بازکشش صورت گرفت و از دقت خوبی برخوردار بود (حدوداً 55/2 درصد خطا) و بر همین اساس طراحی­های پیشنهادی نیز شبیه­سازی شد تا ویژگی‎های مناسب­ترین طرح معرفی گردد Manuscript profile -
Open Access Article
22 - تحلیل عددی و تجربی شکلدهی لوله های مسی مستطیلی بوسیله غلتک‌کاری متوالی لوله مدور پر شده با بیسموت
علی بصیرت نیا محسن لوح موسویساخت لوله های مربعی و مستطیلی به دلیل کاربرد فراوان آنها در صنایعی که نیاز به فشار و درجه حرارت بالا دارند، بیش از پیش مورد توجه قرار گرفته است. روش های مختلفی برای ساخت لوله های چهار گوش وجود دارد از جمله اکستروژن، کشش و فشار. روش دیگری که در سال های اخیر بر روی آن مطا Moreساخت لوله های مربعی و مستطیلی به دلیل کاربرد فراوان آنها در صنایعی که نیاز به فشار و درجه حرارت بالا دارند، بیش از پیش مورد توجه قرار گرفته است. روش های مختلفی برای ساخت لوله های چهار گوش وجود دارد از جمله اکستروژن، کشش و فشار. روش دیگری که در سال های اخیر بر روی آن مطالعاتی صورت گرفته است، شکلدهی مجدد لوله های دوار و تبدیل آن به مقطع مربع و یا مستطیل است. در این تحقیقات روش‌هایی که پیشنهاد شده است همگی برای تولید لوله های مربعی کاربرد دارد و امکان تولید لوله‌های مستطیلی با استفاده از آن روش ها وجود ندارد. روشی که در این پژوهش معرفی می­شود عبارت است از پر کردن لوله با بیسموت و غلتک‌کاری در سه مرحله متوالی. در این پژوهش ابتدا در نرم افزار Abaqus فرآیند مورد نظر شبیهسازی می­شود و سپس توسط آزمون تجربی یک نمونه واقعی ساخته میشود. نمونه ساخته شده از لحاظ ابعادی مورد بررسی قرار می­شود و با نتایج بدست آمده از شبیه سازی مقایسه میشود. نتایج این تحقیق نشان می‌دهد که روش پر کردن لوله توسط بیسموت و عبور از سه غلتک، روشی مناسب برای ساخت لوله‌های جدار نازک با مقطع مستطیل شکل است Manuscript profile -
Open Access Article
23 - بررسی پارامتر‌های ولتاژ و تعداد دور سیمپیچ بر روی فرآیند شکلدهی الکترومغناطیس ورق های V شکل آلومینیوم
سجاد نادیان برسیانی احمد کشاورزی امین کلاه دوزجهت شکل­دهی قطعات بدون اثر­گذاری سنبه بر روی آنها از نیروی الکترومغناطیس که یکی روش­های شکل­دهی سریع می­باشد، استفاده می­شود. استفاده از این نیرو باعث می­شود که قطعات شکل­دهی داده شده دارای کمترین برگشت فنری و پارگی را داشته باشند و به عل Moreجهت شکل­دهی قطعات بدون اثر­گذاری سنبه بر روی آنها از نیروی الکترومغناطیس که یکی روش­های شکل­دهی سریع می­باشد، استفاده می­شود. استفاده از این نیرو باعث می­شود که قطعات شکل­دهی داده شده دارای کمترین برگشت فنری و پارگی را داشته باشند و به علت عدم اثر گذاری هزینه­های ساخت تجهیزات مانند ساخت سنبه کاهش می­یابد. در این مقاله از نیروی الکترومغناطیس جهت شکل­دهی ورق­های آلومینیوم به شکل ­وی شکل استفاده شده است. در شکل­دهی الکترومغناطیس سیم­پیچ­ها رابط بین دستگاه و قطعه­کار می­باشند. به همین جهت در این مقاله به بررسی تعداد دور و ولتاژ دستگاه در 10 سطح پرداخته شده است. با توجه به نتایج بدست آمده و تحلیل آنها با استفاده از روش­اماری فاکتوریل کامل، نشان داده شد که بهترین حالت شکل­دهی در ولتاژ 1500 ولت و سیم­پیچ 35 دور می­باشد که دلیل آن ولتاژ بالای دستگاه جهت ایجاد یک شدت جریان آنی و تعداد دور مناسب جهت انتقال کامل نیرو به قطعه کار می­باشد. بطوریکه با افزایش تعداد دور به 40 دور میزان شکل­دهی به مقدار 34/3 درصد کاهش یافته است Manuscript profile
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