10486

9681

كارشناسي ارشد

طراحي كاربردي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مكانيك

1394

پانزده، 88ص.: مصور، جدول، نمودار

محمدرضا فروزان

محمد مشايخي

1394/07/11

مهران مرادي، رضا جعفري ندوشن

1396/10/04

كتابنامه

مكانيك

مهندسي مكانيك

ID9681

به فارسي و انگليسي

13 Investigating Residual Bending Strength of Pultruted Composite Beam Equipped with 3D Woven Textile Sandwich Panel Shock Absorber Exposed to Orthogonal Impact Arash Hajiahmadi a hajiahmadi@me iut ac ir 29th July 2015 Department of mechanical engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Mohammad Reza Forouzan Assoc Prof forouzan@cc iut ac irAbstractA composite material can be defined as a combination of two separate elements which is not causedchemical reaction Pultruted composites have better aggregation properties at least in one direction compareto each component According to the ratio of stiffness to density of these products they could beappropriate superseded for traditional material e g aluminum and steel Pultruted composite beams areeconomic and accessible Despite of appropriate property of pultruted composite beams e g tolerancetension and compression absence of permanent deformation cause damage Reduction of strength in effectof impact is an important weakness of these materials Impact with low velocity which usually happens dueto the material movement or collision of external object would be a serious threat for the strength of thesematerial after collision Therefore studying the behavior of these materials under collision and suggesting astrategy to lessen the effect of collision is unavoidable In current research in order to reduce the effect ofcollision on these materials using a suitable energy absorber is suggested The energy absorber which isused in this research is integrated woven textile named Parabeam Sandwich panels which have a corewith soft material is appropriate for absorb the energy but the dissimilarity of facesheet and core materialand the inequality of flexural stiffness is the cause of delamination The facesheet and core in integratedwoven textile sandwich panels beneficially connected and the delamination is eliminated Comparing theresidual strength of solitary beam and beams equipped with Parabeam exposed to orthogonal impact isinvestigated A 3D finite element model is employed to predict the mechanical behavior of integratedwoven textile and then the obtained property was assigned to a homogenous material which was used onthe pultrusion beam as a energy absorber The property of pultrusion composite beam was assigned as anorthotropic material by using VUMAT subroutine Finally the results between experiment and FEM modelwere compared KeywordsLow velocity impact Energy absorber Integrated sandwich panel Parabeam Finite element analysis Damage VUMAT

محمدرضا فروزان

محمد مشايخي

مهران مرادي، رضا جعفري ندوشن