脆性材料哑铃形拉伸试样的应力分布及断裂位置研究

doi:10.19491/j.issn.1001-9278.2009.02.020

中国塑料 ›› 2009, Vol. 23 ›› Issue (02): 88-92 .DOI: 10.19491/j.issn.1001-9278.2009.02.020

脆性材料哑铃形拉伸试样的应力分布及断裂位置研究

邓可，卜海涛，洪剑城，刘先锋，吴世见

1.重庆医科大学计算机教研室，重庆400016； 2.四川大学高分子科学与工程学院，成都610065

收稿日期:2008-10-27 修回日期:1900-01-01 出版日期:2009-02-26 发布日期:2009-02-26

Study on the Stress distribution and fracture location of dumb-bell specimens of brittle materials

DENG Ke, BU Hai-tao,HONG Jian-cheng,LIU Xian-feng,WU Shi-jian

1. Computer Science Staff Room, Chongqing Medical University, Chongqing 400016, China; 2.College of Polymer Science and Engineering, Sichuan University, Chengdu 610065,China

Received:2008-10-27 Revised:1900-01-01 Online:2009-02-26 Published:2009-02-26
Contact: DENG Ke,

摘要/Abstract

摘要： 应用大型有限元分析软件ANSYS模拟分析了哑铃形拉伸试样在拉伸过程中的应力分布及应力集中的位置和应力集中系数，分析结果显示过渡圆弧处出现应力集中，应力集中系数达到了1.123。分别采用聚苯乙烯（PS）的压制和注射成型的两种哑铃形试样，研究了试样的拉伸断裂过程及断裂位置，并验证了模拟分析结果正确性。结果表明压制哑铃形试样是均质各向同性，其断裂发生在应力集中系数最大的圆弧过渡位置；对于各向异性的注塑哑铃形试样，断裂发生在表层和剪切层较薄的浇口远端平直段，应力集中对其影响较弱。

关键词: 哑铃形试样, PS, ANSYS分析, 应力集中, 皮芯结构

Abstract: The stress distribution, stress concentration position and stress concentration factor of the dumb-bell specimens during tensile testing were simulated with ANSYS. It showed that there was obvious region of stress concentration distributed at the circular arc, with a factor of 1.123.PS specimens were prepared by compression and injection molding. The tensile fracture process and fracture region of specimens were found agree with the simulate-analytical results. The compression molded dumb-bell specimens were homogeneous and isotropic, and fracture occurred on the circular arc transition, on which the stress concentration factor was the maximal. The injection molding dumb-bell specimens fractured on the straight portion far from the gate on which the thickness of the skin layer and the shearing layer were thin. And the influence of stress concentration was weak.

Key words: dumb-bell specimens, PS, ANSYS analysis, stress concentration, skin-core structure

邓可, 卜海涛, 洪剑城, 刘先锋, 吴世见. 脆性材料哑铃形拉伸试样的应力分布及断裂位置研究[J]. 中国塑料, 2009, 23(02): 88-92 .

DENG Ke, BU Hai-tao, HONG Jian-cheng, LIU Xian-feng, WU Shi-jian . Study on the Stress distribution and fracture location of dumb-bell specimens of brittle materials[J]. China Plastics, 2009, 23(02): 88-92 .

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脆性材料哑铃形拉伸试样的应力分布及断裂位置研究

Study on the Stress distribution and fracture location of dumb-bell specimens of brittle materials

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