List of Articles آباکوس

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  1 - Path estimation of crack growth under multi-axial loading in a plate with center rectangular notch
  Kazem Reza Kashyzadeh
  In the present paper, the main purpose is estimated path of crack growth under multi-axial loading. So, used plate with a center rectangular notch that has an initial crack with 5 mm length and 〖-55〗^°angle. At the First, has been obtained stress intensity factors o More

  In the present paper, the main purpose is estimated path of crack growth under multi-axial loading. So, used plate with a center rectangular notch that has an initial crack with 5 mm length and 〖-55〗^°angle. At the First, has been obtained stress intensity factors of failure mode I and II by using ABAQUS software. Next has been calculated equivalent stress intensity factor and estimated path of crack growth by using the maximum environmental stress method. This trend has been continued to finish failure. Manuscript profile
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  2 - مدلسازی لوله های انتقال گاز با شبکه های عصبی مصنوعی به منظور تشخیص عیوب آنها
  علی جودکی مرتضی محمدظاهری احسان جمشیدی
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  3 - Damage detection in gas transmission lines based on natural frequency changes via artificial neural networks
  Ali Asghar Binaieyan Ehsan Jamshidi Alireza Arghavan
  The purpose of this paper is to introduce a new approach for troubleshooting of gas pipelines using mechanical waveforms. In this paper, an attempt has been made to determine the defects by using natural frequency characteristics and changes. Due to the relationship bet More

  The purpose of this paper is to introduce a new approach for troubleshooting of gas pipelines using mechanical waveforms. In this paper, an attempt has been made to determine the defects by using natural frequency characteristics and changes. Due to the relationship between mass and stiffness in determining the natural frequency, a mass increase has been used instead of the reduction of stiffness. The proposed method involves modeling a 2-inch pipe with a length of 2 m in the Abaqus software and examining the natural frequencies of the pipe in a state of intact and defective (cracking). Then, an equivalent mass value was applied to model the defects. Subsequently, the pipe was subjected to experimental modal analysis and various conditions were tested by creating artificial defects (adding mass). Then, the obtained information was used in the study of the perceptron neural network in MATLAB software, and the program output is the defect location and its severity (mass value). Manuscript profile
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  4 - Simulation of clearance effect on LDR in stainless steel deep drawing
  Ali Fathi Jokandan Mehrdad Ozve Aminian
  Deep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process  is clearance between punch and matrix More

  Deep drawing is one of the most important processes in the sheet metal forming industry where a flat sheet is drawn by the punch into the hole matrix And It takes the shape of the punch. The effective parameter in this process  is clearance between punch and matrix. Finite element method is a useful tool for the study of process and impact parameters affecting it. In this project the effect of clearance between punch and matrix on LDR was considered and result are showed 0.9 mm clearance is more optimum suitable for 0.6 mm sheet thickness in deep drawing and decreased to 0.66 mm clearance the LDR was decreased. Manuscript profile
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  5 - Investigating of Behavior of Compoite Beams Will Long Leagth Large Under Dynamic Loading with Abaqus
  negin Esazadeh Amin ghannadi asl
  The use of concrete in combination with steel in structures can play an important role in improving the structural behavior, ie increase in strength and formability. In many cases, in steel structures that do not meet the considerably shaping criteria.In this study,a so More

  The use of concrete in combination with steel in structures can play an important role in improving the structural behavior, ie increase in strength and formability. In many cases, in steel structures that do not meet the considerably shaping criteria.In this study,a solid concrete beam and steady steel beams were modeled using ABAQUS finite element software and verified by a laboratory model. In the following six groups, the difference in specimens was only in the manner of connecting concrete to steel, and for each of the six series, five different thicknesses were considered and investigated,which resulted in the following conclusions. Increasing the number of cutters increases the resistance of composite beams.By increasing the number of simple cut-offs into two rows, 10% of the final bending strength of the composite beams increases.The difference between the studs and the corners is not significantly different.The effect of simple cut-offs and L shapes has been around 2%. Manuscript profile
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  6 - Investigation of Seismic Behavior of Concrete Structures Reinforced with FRP and Steel Bars
  arash dalili ramin vafaeipoor
  Considering the increasing use of FRP bars, as reinforcement in concrete structures, the study of the dynamic behavior of these types of structures and its behavioral comparison with steel reinforced concrete structures seem to be necessary. In this regard, in the prese More

  Considering the increasing use of FRP bars, as reinforcement in concrete structures, the study of the dynamic behavior of these types of structures and its behavioral comparison with steel reinforced concrete structures seem to be necessary. In this regard, in the present study, buildings with floors 2, 5, and 10 in two-dimensional and three-dimensional states were considered in two types of steel reinforced and FRP reinforced were modeled and analyzed in ABAQUS software. By using the results of the analysis, behavioral comparisons between these structures were carried out with a focus on displacement. By considering in the same conditions, the results of the analysis reveal that displacement in FRP-reinforced structures is more than steel-reinforced structures. Also, in the 2-storey building model, the relation between steel structures and FRP structures is linear with 90% regression coefficient was observed while in 5-storey buildings and 10-storey building’s behavior are nonlinear, with a regression coefficient of 89% and 87%, respectively. Manuscript profile
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  7 - Strengthening of Simple Prestressed Beams Using Carbon and Glass Reinforcing Polymer Fibers
  Seyed Fathollah Sajedi Amin Toolabi Shaykhi
  10.30495/civil.2022.691839
  In this study, after evaluating the capability of Abaqus software and ensuring the results, two non-reinforced prestressed beams as reference models and 24 reinforced prestressed beams with carbon and glass reinforcing fibers and application of concrete with strength of More

  In this study, after evaluating the capability of Abaqus software and ensuring the results, two non-reinforced prestressed beams as reference models and 24 reinforced prestressed beams with carbon and glass reinforcing fibers and application of concrete with strength of 30, 40 and 50 MPa and prestressed cables with diameters of 16, 20 and 22 mm were modeled. After numerical analysis of prestressed concrete beams with and without reinforcing fibers, their bearing capacity was investigated. After numerical analysis of prestressed concrete beams with and without reinforcing fibers, their bearing capacity was investigated. It was concluded that in the simple reinforced concrete and prestressed beams, cracks resulting from tensile damage in the middle cross section of the beams with maximum stress are continuously reduced with a gentle slope towards the supports. In simple reinforced concrete and prestressed beams, the highest stresses were created in the tensile reinforcements at the bottom of the beam and in shear reinforcements, the stress get started in the middle section of the beams and exhibited its maximum in the lower part of the beam section. In addition, in simple prestressed concrete beams, the capacity was increased by raising the number of prestressed tendons from 1 to 2 and 3. The capacity of beams with 3 tendons has increased by 79% and 22% compared to the beams with 1 and 2 tendons, respectively. The bearing capacity of prestressed concrete beams with C50 consumption category were increased by 6% and 5% contrasted to the prestressed concrete beams made of C30 and C40 concrete categories, respectively. By comparing the reinforced models using carbon reinforcement sheets in comparison with the glass type, the bearing capacity of beams containing carbon fibers are enhanced by about 12% (on average) compared to different types of glass fibers. Manuscript profile
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  8 - Investigation of the dynamic response of the subsea transmission pipeline under explosion impact using experimental and numerical methods
  Hamid nasiri mohammad asadian ghahferokhi Madjid Ghodsi Hassanabad amin bahmanpour
  10.30495/civil.2022.694460
  Sea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these ad More

  Sea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these advantages, the harsh natural conditions at sea, such as the presence of high waves, tsunamis, sea ice, as well as ammunition and unused military equipment buried under water left over from the First and Second World Wars, also from the imposed war, which could impose a lot of potential human and financial risks due to explosions. In this paper, using the Abaqus finite element software, the dynamic response of a cylindrical tube buried in the sea subjected to the explosion is investigated applying numerical and experimental methods. Finite element models based on the experimental models were examined and the numerical results were compared with the experimental data. The results indicated that the maximum impact wave pressure, bubble propagation duration and displacement due to the cylinder deformation in the experimental and finite element analysis were well compatible Manuscript profile
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  9 - Evaluation of suitable geometric characteristics of recreant steel core in non buckling CBF bracing
  Alireza faroughi morteza yarmohammadtouski
  The performance of a BRBs is highly dependent on the geometric characteristics of sections. Steel core components play highly role in the absorption of energy and the other members only prevent buckling, Therefore the proper performance of BRBs are dependent on suitable More

  The performance of a BRBs is highly dependent on the geometric characteristics of sections. Steel core components play highly role in the absorption of energy and the other members only prevent buckling, Therefore the proper performance of BRBs are dependent on suitable steel core sections. There is an example of a recreant steel core of 40mm*20mm with total length of 2660mm selected in accordance to the Zsarnóczay Laboratory and modeled in the finite element software. Then compared with laboratory and accuracy results in the Abacus software three other models of 40mm*30mm, 40mm*40mm, 60mm*20mm with overall length of 2660mm in accordance with the necessary invariant bracket factors taken from the Pedro Romero laboratory paper were introduced, modeled and verified with the same physical specification. Then the cross section of 40mm*30mm was selected as the appropriate cross section for the recreant steel core in terms of software output based on parameters such as hysteresis curve comparison, sample hardness comparisons, proper ratios of compressive force to tensile strength. Then for accuracy of suitable cross section for different model, by retaining the proportions of the bracing components, recreant core 40mm*40mm with a total length of 3600mm were modeled Manuscript profile
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  10 - Analysis of FGM Beam by FEM Method Applying Abacus Software
  mehdi ghohyeei Seyed Alireza Mohajerani Saeed Jafari Mehr Abadi behnaz ghohyeei
  Low–velocity foreign object impact damage is one of the most important issues in composite materials used in military and civil structures. Fiber composites are strong sheets, which are subjected to impact loads, to reduce the damage of the impact using hard resin More

  Low–velocity foreign object impact damage is one of the most important issues in composite materials used in military and civil structures. Fiber composites are strong sheets, which are subjected to impact loads, to reduce the damage of the impact using hard resins. In this research, low-speed bullet impact to six beams with FGM layering whose modulus of elasticity in the beam thickness varies from ceramic to metal and the response of the beams to low velocity impact has been investigated by finite element method using Abacus software. The strain, displacement and tension of the beam have been analyzed in two modes of the last layer of the metal and ceramic – metal. A comparison of displacement, tension and strain diagrams along the length of the beam for the six beams has been made. It was observed that the higher the properties of the metal than the ceramic, the higher the amount of displacement and tension and the strain in the beam decreased with increasing degree of ceramic properties compared to the metal. Manuscript profile
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  11 - تحلیل تنش های ایجاد شده بر روی پره های کامپوزیتی هلیکوپتردر مانور پرواز ایستا
  علی اصغر نادری محسن نظری
    هدف اصلی این مقاله، بررسی سازه‌ای پره کامپوزیتی یک بالگرد انتخاب شده می‌‌باشد. در این تحقیق به بررسی تنش‌های وارد شده بر پره‌های روتور (ملخ)، در اثر نیروهای گریز از مرکز، لیفت، درگ و گشتاور پیچشی پرداخته می‌شود. معادلات حاکم بر رفتار سازه و حل معادلات را در برنام More

    هدف اصلی این مقاله، بررسی سازه‌ای پره کامپوزیتی یک بالگرد انتخاب شده می‌‌باشد. در این تحقیق به بررسی تنش‌های وارد شده بر پره‌های روتور (ملخ)، در اثر نیروهای گریز از مرکز، لیفت، درگ و گشتاور پیچشی پرداخته می‌شود. معادلات حاکم بر رفتار سازه و حل معادلات را در برنامه متلب بدست آورده و شبیه‌سازی با استفاده از نرم افزار آباکوس انجام داده شده و با یکدیگر مقایسه می‌شوند. برنامه نوشته شده در متلب، براساس تئوری المان تیر بوده و محاسبه تنش‌ها و جابجایی‌های المان‌های درنظر گرفته شده پره از ویژگی‌های کد تدوین شده است. در نرم افزار آباکوس، پره بالگرد در حالت‌های مختلف اعم از پره آلومینیومی و کامپوزیتی با و بدون وب و پره کامپوزیتی با لایه چینی‌های دارای زوایای مختلف شبیه‌سازی شده است. نتایج این حالات گوناگون با یکدیگر و با کد مقایسه گردیده‌اند. در نهایت، نتایج با مقاله مرجع مقایسه شده است. مقایسه بین نتایج المان تیر و شبیه سازی آباکوس از تطابق خوبی برخوردار است. به منظور بهینه سازی ملخ کامپوزیت باید عواملی همچون کاهش مقدار جابجایی، کاهش میزان تنش و جلوگیری از افزایش بیش از حد وزن در نظر گرفته شود، به‌طوریکه با افزایش ضخامت لایه های 90 و 45 درجه به 6.5 میلیمتر، ماکزیمم جابجایی 12.9 سانتیمتر و وزن کل سازه 8 کیلوگرم خواهد شد. Manuscript profile
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  12 - تحلیل ارتعاشی دیسک ازجنس مواد مدرج تابعی
  محبوبه روائی حسن نحوی
  دیسک‌های سوراخ‌دار در بخش‌های مختلف صنعت کاربرد‌های فروان دارند. با ساخت این دیسک‌ها از جنس مواد مدرج تابعی، قابلیت های بیشتری از آن‌ها می‌توان به‌دست آورد. تحلیل ارتعاشی این نوع دیسک‌ می‌تواند در ساخت هر‌چه کارآمد‌تر آن‌ به ما کمک کند.  در این مقاله، مدل‌سازی و بر More

  دیسک‌های سوراخ‌دار در بخش‌های مختلف صنعت کاربرد‌های فروان دارند. با ساخت این دیسک‌ها از جنس مواد مدرج تابعی، قابلیت های بیشتری از آن‌ها می‌توان به‌دست آورد. تحلیل ارتعاشی این نوع دیسک‌ می‌تواند در ساخت هر‌چه کارآمد‌تر آن‌ به ما کمک کند.  در این مقاله، مدل‌سازی و بررسی ارتعاشات آزاد دیسک از جنس مواد مدرج تابعی در راستای ضخامت، با نرم‌افزار آباکوس انجام شده‌است. از آن‌جا که در نرم‌افزار آباکوس در زمینه‌ طراحی و تحلیل مواد مدرج تابعی المان خاصی تعریف نشده است، مدل سازی این مواد در این نرم افزار انجام شده‌است. به منظور صحت‌سنجی، نتایج تحلیل آباکوس با نتایج موجود در مقالات مقایسه شده است. نتایج به‌دست آمده نشان می‌دهد که با تعریف لایه‌های بیشتر در راستای تغییرات خواص، نتایج به‌دست‌آمده به جواب‌های دقیق نزدیک‌‌تر می‌شود. Manuscript profile