Prediction of static tensile failure of double-bolt joint for composite laminate
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Prediction of static tensile failure of double-bolt joint for composite laminate Wangnan Li1,2 · Shaojuan Lu3 · Guijie Liang1 · Xiaohong Cheng1 · Jingyang Wang1 · Zhicheng Zhong1
Received: 29 March 2019 / Accepted: 21 August 2019 © Springer Nature B.V. 2019
Abstract Based on the micro-mechanics of failure (MMF) theory, the accelerated testing methodology (ATM) and the VUMAT subroutine in ABAQUS, this study put forward a novel microscopic analysis approach for the large deformation failure analysis of composite. The predicted strength accuracy of the MMF approach for the bolted structure was then compared with those calculated based on the Tsai–Wu and Hashin theories, and with the experimental results. Results showed that the MMF method enjoyed the highest strength accuracy with an error of 7.2%, and the component damage initial occurred in matrix of the 90-degree layer and the initial failure of fiber occurred in the 0-degree layer. The failure mode predicted by the MMF approach behaved as shearing mode, which was in agreement with the experimental results. The long-term static strength of the bolted structure was predicted based on the MMF/ATM approach, and a comparison with the test results was conducted. Keywords Theory of micro-mechanics of failure · Accelerated testing methodology · Progressive failure · Bolted joint · Failure mechanism · VUMAT
1 Introduction Carbon-fiber-reinforced-polymer (CFRP) composites have a widespread application in the area of aerospace engineering due to their excellent features, such as exceptional design ability, high specific strength, specific stiffness, specific modulus, fatigue resistance, corrosion resistance and low thermal expansion coefficient.
B S. Lu
[email protected]
1
Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang 441053, China
2
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
3
Hubei Institute of Aerospace Chemotechnology, 58, Qinghe Road, Xiangyang, Hubei 441003, China
Mech Time-Depend Mater
It is inevitable to take advantage of joining technology to process CFRP composites. However, the design and strength analysis of the joints using CFRP composites are fundamentally different from that using metal materials. And there are many factors affecting the joint strength of composites. Therefore, theoretical research on the structural mechanics of CFRP composites plays a significant role in the application and development of CFRP composites (Sakai et al. 2013; Pingkarawat and Mourtiz 2014; Katoh and Ishikawa 2013). Generally speaking, the structural joints using CFRP composites can be divided into three types: adhesive bonding, mechanical connection and a mixture of both. In most cases, a bolted connection is adopted for structural joints under high loads. Accordingly, extensive attention has been paid to the failure analysis, load distribution, fatigue life and structural strength of composite bolted joints (Turveya and
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