توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Calculation of Upsetting Limit using Lemaitre Coupled Damage Model
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۰
In most cold forming operations, formability is limited by ductile fracture. This study presents an FEM simulation of upsetting process to predict when and where material is likely to fracture. The concept of continuum damage mechanics has been retained to describe the progressive damage accumulation into the bulk metal leading to the final rupture and a fully coupled Lemaitre damage model was implemented through a subroutine (VUMAT) in Abaqus\Explicit. The simulation results have been compared to the corresponding results obtained from an experimental upsetting process. It is found that the numerical predictions are in good agreement with the experimental results.<\div>

۲Experimental and Numerical Study of Optimum Die Profile in Backward Rod Extrusion of Lead
اطلاعات انتشار: اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۰
In this paper, the stress and load relations in backward rod extrusion of lead have been obtained by the slab method for curved die profile. By the use of a developed computer program, the optimum die profile has been obtained on the basis of minimization of stress and load in die–workpiece contact surface. By using the FEM software, ABAQUS, the optimum die angle for the conical die is also determined. Then, the finite–element and experimental load–displacement curves have been determined. It is illustrated that the extrusion load for optimum curved die is reduced by 11%, compared to that in the optimum conical die.<\div>
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