Assessing fracture behavior in Composite-Metal bonded joints under opening and sliding Modes: Insights from Experiments, CZM, and FEA

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-09 DOI:10.1016/j.tafmec.2024.104713

Vivek Kumar , Akhilendra Singh , Rajendra Kumar Gupta

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Abstract

The fracture behavior of AA 7050-T6/CFRP adhesive joints was investigated under mode I and II loading. Digital Image Correlation (DIC) provided precise measurements of crack length and crack tip opening/shear displacement (CTOD/CTSD), while the Extended Global Method (EGM) was used to determine the Energy Release Rate (ERR) and resistance curves (R-curves) for each fracture mode. The direct method was applied to establish the traction-separation law (TSL) and bridging law. Based on observed failure mechanisms, a novel cohesive law with five linear components was proposed, with parameters derived from experimentally obtained TSL and bridging law. Experimental determination of cohesive zone lengths for both fracture modes was achieved using the DIC technique, which was then compared with analytical predictions. Finally, the five-linear and trapezoidal cohesive zone model (CZM) was used to simulate the mode I and mode II fracture processes, respectively, within a finite element framework.

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评估复合材料-金属粘接接头在打开和滑动模式下的断裂行为：来自实验、CZM 和有限元分析的启示

研究了 AA 7050-T6/CFRP 粘合剂接头在模式 I 和模式 II 载荷下的断裂行为。数字图像相关（DIC）提供了裂缝长度和裂缝顶端张开/剪切位移（CTOD/CTSD）的精确测量，而扩展全局法（EGM）则用于确定每种断裂模式的能量释放率（ERR）和阻力曲线（R-curves）。直接法用于建立牵引分离定律（TSL）和桥接定律。根据观察到的断裂机制，提出了一种包含五个线性分量的新型内聚律，其参数来自实验获得的牵引分离律和桥接律。利用 DIC 技术对两种断裂模式的内聚区长度进行了实验测定，并与分析预测结果进行了比较。最后，在有限元框架内使用五线性和梯形内聚区模型（CZM）分别模拟了模式 I 和模式 II 的断裂过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.