Dynamic tensile intralaminar fracture and continuum damage evolution of 2D woven composite laminates at high loading rate

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-22 DOI:10.1016/j.tafmec.2024.104731

Rui He , Yidi Gao , Longfei Cheng , Wencheng Liu , Hao Cui , Tao Suo

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Abstract

The intralaminar tensile failure of 2D woven composites under dynamic tensile load was investigated in this paper. Compact tension samples were tested at high loading rate with an electromagnetic Hopkinson bar system. The strain field was obtained with high-speed imaging and digital image correlation, and the J-integral method was employed to obtain the fracture toughness and corresponding R-curve. The continuum damage evolution of intralaminar failure was then analyzed by tracking the opening near the initial crack tip. It is found that the dynamic intralaminar fracture toughness is decreased by 51% compared to the quasi-static condition, the continuum damage evolution and its dependence on loading rate have been reported as well. The failure mechanisms were studied with thermal imaging and scanned electron microscopy, shorter fibre pull-out length and thinner failure process zone may be responsible for the reduced toughness at high loading rate.

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高加载速率下二维编织复合材料层压板的动态拉伸层内断裂和连续损伤演化

本文研究了二维编织复合材料在动态拉伸载荷下的层内拉伸破坏。利用电磁霍普金森棒系统对紧凑拉伸样品进行了高加载率测试。利用高速成像和数字图像相关技术获得了应变场，并采用 J 积分法获得了断裂韧性和相应的 R 曲线。然后，通过跟踪初始裂纹尖端附近的开口，分析了层内破坏的连续损伤演化。研究发现，与准静态相比，动态层内断裂韧性降低了 51%，同时还报告了连续损伤演变及其与加载速率的关系。通过热成像和扫描电子显微镜对破坏机制进行了研究，较短的纤维拉出长度和较薄的破坏过程区可能是高加载速率下韧性降低的原因。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.