پديد آورنده :
كيان وش، فريد
عنوان :
تحليل تنش وكرنش درويسكوالاستيسيته با نگرش ويژه برروي مساله كمانش
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
طراحي كاربردي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك
صفحه شمار :
ده، 73، [II]ص.: جدول، نمودار
يادداشت :
ص. ع. به: فارسي وانگليسي
استاد راهنما :
محمود همامي
استاد مشاور :
عليرضا شهيدي
توصيفگر ها :
مدول مماسي , مدول كاهش يافته , تبديل لاپلاس , كمانش خزشي , ANSYS
تاريخ نمايه سازي :
23/07/1387
استاد داور :
مهران مرادي، محمود كدخدائي
چكيده فارسي :
به فارسي وانگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractOver the past several decades the use of composite materials has grown considerably Typically fiber reinforced polymer matrix composites are modeled as being linear elastic However it is well known that polymers are viscoelastic in nature In present work a shortreview on linear viscoelasticity theory is performed to introduce the relation between linearelasticity and linear viscoelasticity theories The safe load limit a well defined parameter for columns made of linearly viscoelasticsolid and fluid type materials with limited creep is generalized to materially andgeometrically linear viscoelastic structures in case of quasi static and dynamic equations To illustrate the concepts to be treated a simple rigid bar spring dashpot model simulatingthe behavior of imperfect columns is analyzed in detail Next the imperfect columnproblem is formulated and solved The results of the analysis of the creep deflection of thecolumn showed that for fluid type materials the deflections increase continuously with timeand become infinitely large only when the loading time is correspondingly large However large deflections are obtained in reasonably short periods of time if the applied load is nearto the Euler load of the column For solid type materials the deflections increasecontinuously with time and become infinitely large only when the load magnitude andloading time are correspondingly large Various approximations in the solution techniqueare introduced which allow relatively simple procedures for the evaluation of the safe loadlimit Finally a column is analyzed with a finite element code for which the results arecompared where possible with closed form results a comparison which showssatisfactory agreement
استاد راهنما :
محمود همامي
استاد مشاور :
عليرضا شهيدي
استاد داور :
مهران مرادي، محمود كدخدائي
