توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Statistical Predictor Expression of Draw Depth in Tailor–Welded Blanks
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی و هشتمین کنفرانس ملی مهندسی ساخت و تولید، سال
تعداد صفحات: ۱۲
The formability of TWB in a deep drawing process depends on different parameters such as base material properties, weld line position and weld properties. In this paper a statistical approach of maximum achievable draw depth in a TWB, which consist of two pieces of same thickness, but different material properties for a circular cup have been studied. This method can help to achieve an expression to predict the maximum achievable draw depth in a TWB. The given expression can help designers to predict the maximum achievable draw depth of TWB in a deep drawing process with a lower waste of time and cost. The numerical data which has been verified by experimental tests have been used to propose a regression equation for prediction of drawing depth of a TWB with knowing the maximum drawing depth of its basic components.<\div>

۲New formulation for impact and crushing force of cylindrical shape objects for offshore reliability assessment
نویسنده(ها): ،
اطلاعات انتشار: هفدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۴
The events of september 11,2001 in new york and washington , katrina hurricane in 2005 , latest famous hurricanes such as gustav and Ike in 2008 and many other similar incidents and accidents showed the importance of analysis of object impact on structures and facilities. analysis of all possible scenarios of objects striking to offshore facilities is important in reliability and safety assessment of offshore operation.<\div>

۳New analysis method to obtain dynamci crushing force curve of offshore shock absorber under axial impact
نویسنده(ها): ، ،
اطلاعات انتشار: هفدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۵
In modern offshore installations thin walled columns are used for energy absorption in accident situation when this advanced offshore shock absorber is subjected ti axial copressive load, plastic hinges are developed on the sides of column and the column crushes with repeatable patterns. it can absorb considerable impact energy due to large and continuous plastic deformation.<\div>

۴on the formation of onion ring structure in friction stir butt welds of copper plates produced by non –threaded tool pin
نویسنده(ها): ،
اطلاعات انتشار: کنگره بین المللی جوش و روشهای اتصال، سال
تعداد صفحات: ۵
onion –ring structure is a probinent feature of the many friction stir welds the aim of this investigation is to understand the formation of onion –ring structure in the welded joint produced by a non–threaded tool pin in copper plates. It is shown that the phenomenonof onion – ring structure formation is the consequence of dimple in middle area o feach layer of material which deposited to back of the tool in one rotation and cutting through the section of the material moreover onion–ring structure can be created by non–threaded tool pin in transverse cross –section and the space and depth of semi–circular surface features are equal to welding pitch displacemnet \revolution and plunge depth respectively. a micrl –structural study shows that the weld has lamellar structure and the bonding force in friction stir welds is caused by the mixing of materials from the sides of layer interfaces.<\div>

۵The Effect of Variation in Mechanical Properties and Friction Conditions on Acceptable Range of Blank Holder Force
نویسنده(ها): ، ، ،
اطلاعات انتشار: دوازدهمین کنفرانس ملی مهندسی ساخت و تولید ایران، سال
تعداد صفحات: ۶
In the present paper, the effect of variant material properties and frictional conditions in stamping process of automotive body panel is investigated numerically by Finite Element Method (FEM). An acceptable blank holder force (BHF) range is considered as studying factor where the final deformed part is achieved defect free. Numerous numerical simulations have been performed to obtain the safe region of BHF that is bounded by two critical curves. For each specific material property with variant frictional condition, the rupture and wrinkling tendency critical curves obtained. The experimental observations showed good agreement with FE predicted BHF amount. From the FE results, it is expected that the minimum acceptable BHF magnitudes (slightly above the critical wrinkling tendency curve) is the optimal adjusted BHF for safe formed part with forming energy consumption. Also, the lower amount of friction coefficients provides the wider proper BHF range for adjusting press easily.<\div>
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