Analysis of Open-Hole Compressive CFRP Laminates at Various Temperatures Based on a Multiscale Strategy
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Analysis of Open-Hole Compressive CFRP Laminates at Various Temperatures Based on a Multiscale Strategy Zhun Liu 1 & Zhidong Guan 1
1
& Riming Tan & Jifeng Xu
2
Received: 19 October 2018 / Accepted: 10 January 2019/ # Springer Nature B.V. 2019
Abstract In this paper, a multiscale analysis strategy was proposed to analyze the failure behaviors of open-hole compressive (OHC) CFRP laminates. Micro-level intralaminar failure was defined in the constituents (fiber and matrix) with a modified micromechanics failure theory. In the multiscale stress transformation, the effect of thermal residual stress was considered using constant thermal amplification factor. Meanwhile, macro-level interlaminar failure was defined with cohesive elements. Based on the simulated and experimental results, the sub-laminate scaled OHC laminates of the stacking sequence [45/0/−45/90]4s were studied at different temperatures. The established multiscale model showed good precision in the strength and failure mode predictions. Transverse throughout damage at the hole section led to the final failure. As the temperature increased, the damage process began at a lower load level and the strength of the laminates decreased significantly. Stiffness reductions and small load drops were more likely to occur before final failure. The differences in the delamination size among all interfaces tended to be smaller. Besides, matrix failure lagged under shear loading conditions if the thermal residual stress was neglected in the multiscale analysis. Keywords Multiscale analysis . Open-hole compressive . Constituent . Temperature . Thermal residual stress
1 Introduction Due to the high specific strength and modulus, carbon fiber reinforced plastics (CFRP) have been widely used in situations where structural efficiency is the first priority. Before practical application, the composite structures must be comprehensively evaluated to ensure their integrity in virtue of experiments or fully developed structural models [1]. * Zhidong Guan [email protected]
1
School of Aeronautic Science and Engineering, Beihang University, XueYuan Road No.37, HaiDian District, Beijing 0086-100191, China
2
Beijing Aeronautical Science and Technology Research Institute, Beijing, China
Applied Composite Materials
At the macro level, the early developed failure criteria, such as Tsai-Wu tensor criteria [2], Hashin criteria [3] etc., are usually in conjunction with phenomenological models. These semiempirical methods are very popular in engineering because of their usability and acceptable accuracy. However extensive tests need to be conducted to identify the extra parameters required. As the mechanical behavior at the macro level is the consequence of an accumulation of micro-level events, efforts have been increasingly dedicated to studying the micro mechanisms of mechanical behaviors. Some fully detailed microstructure models have been used to study the micro behaviors of composites [4]. In recent years, some multiscale strategies combined with representative volume eleme
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