7153

6659

كارشناسي ارشد

سازه

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1390

ده، 137ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

مجتبي ازهري، حميدرضا ميردامادي

بيژن برومند

6/8/91

محمد مهدي سعادت پور، كياچهر بهفرنيا

1396/09/20

كتابنامه

عمران

مهندسي عمران

ID6659

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Elastic Wave Propagation Study of FGM Plates due to Impact Loading based on Plate Theories and Elastodynamics Solution Milad Mehrkash m mehrkash@cv iut ac ir 3 March 2012 Department of Civil Engeenering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language Farsi Supervisors Prof Mojtaba Azhari mojtaba@cc iut ac ir Dr Hamid Reza Mirdamadi hrmirdamadi@cc iut ac irAbstractFunctionally Graded Materials FGM s are inhomogeneous composites which arecharacterized with the gradual variation of their constituents Because of this specificproperty FGM plates show high resistance against mechanical loadings in addition toconsiderable durability in thermal environments Hence FGM plates have found extensiveapplications in various industries especially aerospace ones Furthermore ultrasonicelastic waves play a major role in performing non destructive evaluation Therefore it isnecessary to know the behaviour of these waves particularly in heterogeneous media Approximate plate theories might be considered as simple alternatives for sophisticatedelastodynamics solution to carry out wave propagation analysis in plates To employ platetheories for this purpose detecting a compromise between simplicity and accuracy ofnumerical results is a serious concern This problem is the main topic of the present thesis In this research investigation is done for infinite FGM plates in different cases of highfrequency dynamic loadings and for various plate thicknesses as well as severalheterogeneity amounts Based on the obtained results the reliability range of the platetheories for flexural wave propagation analysis in inhomogeneous FGM plates areillustrated A hybrid numerical method HNM is employed to validate the results of platetheories This method that uses layer elements is a combination of modal analysis andFourier transform Moreover some other issues such as effects of in plane forces andelastic foundations on the wave motion in FGM plates are studied Also the inverseprocedure for recovery of impact load is discussed KeywordsWave Propagation FGM Plate Plate Theories Hybrid Numerical Method

مجتبي ازهري، حميدرضا ميردامادي

بيژن برومند

محمد مهدي سعادت پور، كياچهر بهفرنيا