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塑料SHPB实验中的端面摩擦效应
引用本文:卢玉斌.塑料SHPB实验中的端面摩擦效应[J].爆炸与冲击,2012,32(1):15-22.
作者姓名:卢玉斌
作者单位:1.西南科技大学制造过程测试技术教育部重点实验室,四川绵阳621010
基金项目:四川省教育厅科研基金,四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地开放基金,西南科技大学博士研究基金
摘    要:基于H.Meng的动摩擦实验结果,建立了一个端面动摩擦模型,以描述端面动摩擦因数随SHPB 塑料试样与钢压杆接触界面间最大径向相对滑动速度的关系。在SHPB实验的数值模拟中,分别考虑了该 端面动摩擦模型和以往被广泛采用的常摩擦因数模型,结果发现,选取不同的端面摩擦模型不影响通过塑料 SHPB实验的数值模拟获得的转折应变率(量级为102s-1),然而当应变率超出转折应变率以上时,不同的端 面摩擦模型会对塑料SHPB实验的数值模拟结果产生显著影响,使用提出的端面动摩擦模型可得到更准确 的塑料SHPB实验的数值模拟结果。

关 键 词:固体力学    端面摩擦效应    SHPB实验    塑料    相对滑动速度

Interfacial friction effect in SHPB experiments of plastics
LU Yu-bin.Interfacial friction effect in SHPB experiments of plastics[J].Explosion and Shock Waves,2012,32(1):15-22.
Authors:LU Yu-bin
Institution:1.MinistryofEducationKeyLaboratoryofTestingTechnologyforManufacturingProcess,
Abstract:A kinetic interface friction model is proposed based on the kinetic friction tests by Meng to describe the variation of kinetic friction coefficient with the maximum radial relative velocity between the SHPB polycarbonate(PC) specimen and steel pressure bars.The kinetic interface friction model and the constant friction coefficient model are implemented into the numerical simulations of SHPB tests.It shows that using different interfacial friction models has little influence on the transitional strain rate(in the order of 102 s-1) obtained from the numerical simulations of SHPB tests on polymer specimens.While the strain-rate exceeds the transitional strain rate,this influence is obvious,and it is necessary to use the kinetic interfacial friction model,rather than the constant friction coefficient model for obtaining more accurate numerical simulations of SHPB tests on polymer specimens.
Keywords:solid mechanics  interfacial friction effect  SHPB experiment  plastics  relative sliding velocity
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