埋深对双丝拉拔过程力学性能影响  

Influence of mechanical property of twin fibers pull-out test with embedment

作　　者：张亚芳[1] 曾向荣[1] 刘浩[1] 何娟[1] 

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《中山大学学报（自然科学版）》2016年第5期43-47,共5页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(51278136);广州市科技创新平台资助项目(15180005)

摘　　要：在考虑材料细观非均匀性前提下建立二维双丝拉拔数值模拟模型,研究埋深变化对双丝拉拔构件力学性能的影响,获得不同双丝埋深构件的荷载-位移曲线、沿界面剪应力曲线及荷载-步长声发射曲线等,观察界面控制下不同埋深构件拉拔过程裂纹演化过程及基体剪应力分布情况。结果表明,埋深变化对构件破坏模式及剪应力分布影响较大;随着双丝埋深增加,构件的峰值荷载增大,韧性不断增强。Numerical models of 2D twin fibers pull-out test have been created based on material mesolevel heterogeneity. The influence of mechanical property of twin fibers pull-out test with embedment have been studied. Load-displacement curves, interface shear stress distribution curves and load-step-AE （Acoustic Emission） curves were obtained with various embedment depth. Crack evolution and shear stress distribution with various embedment of specimens under interface control are, therefore, investigated. The results show that the change of embedment depth has great influence on failure process and shear stress distribution. With the embedment increasing, peak load and toughness increase either.

关 键 词：埋深 双丝拉拔 剪应力 声发射 

分 类 号：TB333[一般工业技术—材料科学与工程]