-
Open Access Article
1 - Determination of Local Constitutive Properties of Aluminum using Digital Image Correlation: A Comparative Study Between Uniform Stress and Virtual Fields
Ali Shahmirzaloo Mohammadreza Farahani -
Open Access Article
2 - Evaluating the Effect of the Second Invariant of Deformation Tensor in The Axial and Azimuthal Shear Deformations
Amir Ghafouri Sayyad Ali Imam Shahram Etemadi Haghighi -
Open Access Article
3 - Modelling Mechanical Properties of AISI 439-430Ti Ferritic Stainless Steel Sheet
N Brinis B Regaiguia O Chahaoui N Maatougui M.L Fares -
Open Access Article
4 - Strain Hardening Analysis for M-P Interaction in Metallic Beam of T-Section
M Hosseini H Hatami -
Open Access Article
5 - On the Optimum Die Shape in Rod Drawing Process Considering Work-Hardening Effect of Material
M.M Mahdavi H Haghighat -
Open Access Article
6 - Numerical and Experimental Study on Ratcheting Behavior of Plates with Circular Cutouts under Cyclic Axial Loading
K Kolasangiani M Shariati Kh Farhangdoost A Varvani-Farahani -
Open Access Article
7 - Response of Qualitative Characteristics of Spring Bread Wheat (Triticum aestivum L.) to Terminal Heat and Determine Correlation Between Traits
Mani Mojadam -
Open Access Article
8 - Experimental investigation of microstructure of aluminum alloy in ECAP process with comparison of two round and square cross sections
Mehdi RafieiPressing materials in ECAP angular molds is one of the forming methods and processes that is done in order to create high strains and stiffness with microstructural improvement. Using angle forming in molds with high pressure, and due to the certation of work hardening MorePressing materials in ECAP angular molds is one of the forming methods and processes that is done in order to create high strains and stiffness with microstructural improvement. Using angle forming in molds with high pressure, and due to the certation of work hardening phenomena, microstructural improvement, good mechanical properties and high flexibility can be achieved. In this paper, the quality of microstructure changes and the improvement of conditions and mechanical strength using the pressing method for aluminum alloy (6xxx) in an angular form is investigated. In this way the prepared forms have two square and circular cross sections and the samples were pressed through the angular pass only one time. The results of the studies showed that by pressing the samples, the structure was improved and uniform microstructure achieved. In the meantime, the samples with a circular cross-section showed better conditions of the effects of work hardening and structural improvement. Manuscript profile -
Open Access Article
9 - Investigation of The Mechanism of Change of Concrete Modulus Matrix in Monotonic Loading and its Numerical Analysis
Farzad Peyman -
Open Access Article
10 - Microstructure evolution and mechanical properties of Mo40/C93200 bimetal processed by compound casting process
Mohammad Honarpisheh Mobin Javaheri Hadi mansouri -
Open Access Article
11 - Age-Hardening Behavior and the Related Changes in a Silver-Copper-Palladium Alloy
Morteza Hadi Iman Ebrahimzadeh Omid Bayat -
Open Access Article
12 - An Investigation Into the Effects of Friction and Anisotropy Coefficients and Work Hardening Exponent on Deep Drawing With FEM
R Hosseini A Ebrahimi mamaghani A Asa -
Open Access Article
13 - Effect of Overage Hardening Heat Treatment on the Micro Structure and Hardness of Nickel-based Super Alloy Rene-80
Mahmoud Moradi Mohammad Meghdad Fallah Fallah Mahdi Kazazi Mahdi Vahdati -
Open Access Article
14 - Design of Low-Pass Filter of X-Ray Energy to Improve the Quality of Medical Imaging
Sasan Soudi Bahareh Khaksar Jalali Hossein Eshghifard -
Open Access Article
15 - Study on Nut Shell Lignification Progress in Hazelnut (Corylus avellana L.) cv. Segorbe
Julien Toillon Julie Robin Maud Thomas Rachid Hamidi -
Open Access Article
16 - Phase, microstructure characterization and hardening efficiency of SKS3 tool steel laser surface hardened by a high-power diode laser
Amirsalar Dehghani Amirreza Farnia Mohammad Javad TorkamanyIn this research, the surface hardening of SKS3 cold work tool steel has been performed by high power diode laser with a maximum power 1600 W. The applied powers of 1200 and 1450 W, the scanning speeds of 1.6 to 3 mm.s-1 and working distances of 55,, 70 and 75 mm were a MoreIn this research, the surface hardening of SKS3 cold work tool steel has been performed by high power diode laser with a maximum power 1600 W. The applied powers of 1200 and 1450 W, the scanning speeds of 1.6 to 3 mm.s-1 and working distances of 55,, 70 and 75 mm were applied as test parameters. Microstructure and phase analysis and microhardness measurement were studied by optical microscopy, electron microscopy, X-ray diffraction and microhardness testing methods, respectively. The microstructure and phase analysis showed that the hardening process led to the formation of martensite and retained austenite dual-phase structure. The use of laser, created all three states of surface hardening, surface melting and non-hardening. The best result in terms of depth and width of hardening was obtained for samples with energy density of 208-250 J/mm2. The calculation of retained austenite phase percentage and heat input, indicated that an increase in the heat input raised the residual austenite percentage, so that for the sample with maximum heat input, the retained austenite phase percentage was calculated to be approximately 37%. Also, for the sample with the highest heat input (906/J/mm2), the lowest hardness was obtained (653 Vickers) and the sample with lower heat input (725 J/mm2) was owned the highest hardness (760 Vickers). Investigations of the values of hardening efficiency showed that the hardening conditions are not improved only by increasing the laser energy density, but to obtain highest hardness and appropriate microstructure, the optimum amount of power and scanning speed is needed. Manuscript profile -
Open Access Article
17 - Modeling of aging process for pre-rolled Ni-Span C 902 superalloy
Mohammad Rasool Moazami Godarzi Maryam Morakabati Seyed Mahdi Abbasi Hassan BadriThe age-hardening curves of hardness measurements obtained for Ni-Span C 902 superalloy under different amounts of cold work, aging temperatures and times showed leveling and pronounced oscillations, indicating instability and reflecting a competition between the effect MoreThe age-hardening curves of hardness measurements obtained for Ni-Span C 902 superalloy under different amounts of cold work, aging temperatures and times showed leveling and pronounced oscillations, indicating instability and reflecting a competition between the effect of sub-structure coarsening and the effect of solute drag and precipitation hardening. An artificial neural network (ANN) was used to model the nonlinear relationship between the parameters of the aging process and the corresponding hardness measurements. The predicted values of the ANN are in accordance with the experimental data. Results showed that the non-deformed and 50 pct cold rolled alloy exhibited a maximum hardness at a tempering parameter of 22 and 21, respectively. Manuscript profile -
Open Access Article
18 - حل مساله ی غیرخطی نوسانگرهای سخت شونده و نرم شونده با روش تجزیه ی آدومین
بهرام گل محمدی قاسم اسعدی کردشولی علیرضا وحیدییکی از عوامل ایجاد اثرات غیرخطی در سیستمهای نوسانی، غیرخطی بودن تابع نیروی بازگرداننده است که طیف وسیعی از آن­ها با تابع چندجمله­ای درجه سه و انتخاب ضرایب مناسب مدل­سازی می­شوند. در این مقاله یک سیستم نوسانگر جرم - فنر تحت تاثیر چنین نیروی بازگرداننده&sh Moreیکی از عوامل ایجاد اثرات غیرخطی در سیستمهای نوسانی، غیرخطی بودن تابع نیروی بازگرداننده است که طیف وسیعی از آن­ها با تابع چندجمله­ای درجه سه و انتخاب ضرایب مناسب مدل­سازی می­شوند. در این مقاله یک سیستم نوسانگر جرم - فنر تحت تاثیر چنین نیروی بازگرداننده­ای درنظر گرفته­ شده و دو دسته پارامتر طوری انتخاب شده­اند که معادلات حرکت دو نوسانگر سخت شونده و نرم شونده از کاربرد قانون دوم نیوتن به­دست آیند. این معادلات دیفرانسیل غیرخطی مرتبه دو ابتدا با استفاده از روش تجزیه­ی آدومین حل شده­اند. در مرحله­ی بعد ابتدا معادلات به دستگاه معادلات مرتبه یک تبدیل و سپس مجددا با روش آدومین حل شده­اند. با توجه به این­که طرف دوم معادلات دیفرانسیل حل شده، برابر با صفر است، برای مقایسه­ی نتایج، پاسخ­ها در معادله قرارگرفته و انحراف آن­ها از صفر به عنوان خطا درنظر گرفته شده­است. مقایسه­ی نتایج نشان می­دهد که روش به­کار رفته برای هر دو مساله از دقت مناسب برخوردار است و همچنین تبدیل معادله به دستگاه معادلات مرتبه­ی پایین­تر منجر به حصول پاسخ­های دقیق­تر می شود. Manuscript profile