文献类型：期刊文献

英文题名：Longitudinal fracture resistance of Double–Double composites without 0o plies

作者：Li, Xiang[1]; Xiang, Yanxun[4]; Xuan, Fu-Zhen[4]; Sun, Yize[3]; Zhi, Jie[1,2]; Yang, Bin[1,2]

机构：[1] School of Aerospace Engineering and Applied Mechanics, Tongji University, 1239 Siping Road, Shanghai, 200092, China; [2] Shanghai Institute of Aircraft Mechanics and Control, 100 Zhangwu Road, Yangpu District, Shanghai, 200092, China; [3] College of Mechanical Engineering, Donghua University, Shanghai, 201620, China; [4] School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2026

卷号：284

外文期刊名：Composites Science and Technology

收录：EI(收录号：20262921112720);Scopus(收录号：2-s2.0-105044576178)

语种：英文

外文关键词：Composite structures - Damage tolerance - Elasticity - Fits and tolerances - Fracture - Fracture mechanics - Laminates - Tensile strength

摘要：Double–Double (DD) laminates, composed of repeating unit blocks in the form of [±Φ,±Ψ], simplify composite design and manufacturing through their homogenized layup. The configurations without 0o plies are of central concern for practical application, as the longitudinal tensile fracture behavior governs a fundamental failure mode under primary loading. This study investigates the translaminar fracture behavior of such DD laminates using two-tapered compact tension (TTCT) tests, with fracture toughness evaluated through the compliance calibration method. The fracture process is simulated using a trilinear cohesive zone model, and the experimentally measured R-curve is incorporated into a finite fracture mechanics (FFM) framework to predict the open-hole strength of DD laminates. The results show that DD laminates exhibit a clear rising R-curve behavior, in contrast to conventional quasi-isotropic laminates. Despite the simplifying assumption that the translaminar damage is modeled as a cohesive crack, the numerical predictions agree well with the experimental results. In addition, an empirical approach based on the principal fracture angle is proposed to predict the propagation fracture toughness of DD laminates, reducing prediction errors to within 10%. Overall, these findings provide a valuable reference for the damage tolerance design of DD laminates, underscoring their potential for advanced composite structures. ? 2026 Elsevier Ltd.