EFFECT OF TRIAXIAL STRESS CONSTRAINT ON THE DEFORMATION AND FRACTURE OF POLYMERS

查看全文 作　　者：[1]王铁军;Kikno [2]Kishimoto;Mitsuo [3]Notomi

机构地区：[1]Department of Engineering Mechanics,Xi'an Jiaotong University,Xi'an 710049,China;[2]Department of Mechanical and Control Engineering,Tokyo Institute of Technology,Tokyo 152-8552,Japan;[3]Department of Mechanical Engineering,Meiji University,Kawasaki-shi,Kanagawa 214-8571,Japan

出　　处：《Acta Mechanica Sinica》索引2002年第18卷第5期,共14页

基　　金：The project supported by the National Natural Science Foundation of China (10125212);the Trans-Century Training Program Foundation and the Key Research Fund of the Education Ministry of China (01159) 摘　　要：One purpose of this paper is to give a brief overview on the researchstatus of deformation,fracture and toughening mechanisms of polymers,includingexperimental,theoretical and numerical studies.Emphasis is on the more recentprogresses of micromechanics of rubber particle cavitation and crazing,and the de-velopment of fracture criteria for ductile polymers.The other purpose is to study the effect of triaxial stress constraint on the deforma-tion and fracture behavior of polymers.Polycarbonate(PC),acrylonitrile-butadiene-styrene(ABS)and PC/ABS alloy are considered in this investigation.A series ofcircumferentially blunt-notched bars are used to experimentally generate different tri-axial stress fields.The fracture surfaces of specimens with different notch radius areexamined by scanning electron microscope(SEM)to study the fracture and tough-ening mechanisms of polymer alloy.It is shown that the triaxial stress constrainthas a significant effect on the deformation,fracture and toughening of PC,ABS andPC/ABS alloy.We will also discuss the extent to which a micromechanies criterionproposed by the first author can serve as a fracture criterion for ductile polymers.A new ductile fracture parameter is emphasized,which can be employed to evaluatethe fracture ductility of polymers.Stress state independence of the parameter for thePC,ABS and PC/ABS alloy has been experimentally verified. 关键词：deformation FRACTURE TOUGHENING CAVITATION crazev MICROMECHANICS PC ABS polymer alloy

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EFFECT OF TRIAXIAL STRESS CONSTRAINT ON THE DEFORMATION AND FRACTURE OF POLYMERS

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