The dynamic crack propagation behavior of mode I interlaminar crack in unidirectional carbon/epoxy composites

被引：29

作者：

Liu, Huifang ^{[1
,2
]}

Meng, Xianghao ^{[1
,2
]}

Zhang, Huawen ^{[1
,2
]}

Nie, Hailiang ^{[1
]}

Zhang, Chao ^{[1
,2
]}

Li, Yulong ^{[1
,2
]}

机构：

[1] Northwestern Polytech Univ, Shaanxi Key Lab Impact Dynam & Its Engn Applicat, Xian 710072, Shaanxi, Peoples R China

[2] Northwestern Polytech Univ, Sch Aeronaut, Xian 710072, Shaanxi, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2019年 / 215卷

基金：

中国国家自然科学基金;

关键词：

Polymer matrix composites; Cohesive zone modelling; Delamination; Dynamic fracture; Finite element analysis; IMPACT-INDUCED DELAMINATION; FRACTURE-TOUGHNESS; FIBER COMPOSITES; LOADING RATE; INITIATION; GROWTH; TEMPERATURE;

D O I：

10.1016/j.engfracmech.2019.05.004

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The dynamic propagation behavior of the mode I interlaminar crack in unidirectional carbon/epoxy composites was investigated by using double cantilever beam (DCB) specimens. The dynamic interlaminar propagation toughness was obtained using a hybrid experimental-numerical method. Using a novel electromagnetic Hopkinson bar system, pure mode I fracture was guaranteed by symmetrical opening displacement rates in the range of 10 - 30 m/s. The crack velocities before crack arrest were between 100 and 250 m/s, which was monitored by crack-propagation gauges and high-speed photography. To model the interlaminar crack, a user-defined cohesive element was developed, which integrated the experimentally measured crack propagation history. The propagation toughness was calculated by the energy balance method and the dynamic J-integral technique. Results from extensive studies indicate that the dynamic propagation toughness is not a single-valued function of the crack velocity for mode I interlaminar crack. Both the external dynamic loads and the interaction with the bending waves emanating from the moving crack tip affect the behavior of the crack propagation.

引用

页码：65 / 82

页数：18

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