An analytical approach to predicting tensile pseudo-ductility and multi-stage failure process of multidirectional thin-ply CFRP laminates

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composite Structures Pub Date : 2025-03-23 DOI:10.1016/j.compstruct.2025.119129

Chenlong Ruan , Bowen Gong , Huan Wang , Xiaoliang Lai , Baofa Cheng , Hua-Xin Peng

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引用次数: 0

Abstract

This paper presents an analytical model for predicting the nonlinear tensile response and progressive failure modes of multidirectional laminates. The proposed method extends the unidirectional pseudo-ductility model to multidirectional laminates and captures the complete failure process by taking accounts of various failure modes, including fiber breakage, matrix transverse failure, free-edge delamination, and potential intermediate layer fragmentation and delamination. Combining the matrix nonlinearity with fiber fracture and delamination in the intermediate layer, the [±θ_n/0°_m/±θ_n] configuration theoretically exhibits the highest uniaxial tensile pseudo-ductility, which is influenced by factors such as ply thickness, ply angle, and proportion of plies. Tensile testing on specimens with various thin-ply [±θ_n/0°₂/±θ_n] configurations were conducted to validate the accuracy of the prediction model. The results showed a good agreement in the stress–strain responses. Furthermore, the [±30°₆/0°₂/±30°₆] configuration exhibited intermediate ply fragmentation with a pseudo-ductile strain of 4.04 %, while other configurations with higher 0° ply proportions experienced catastrophic delamination or fracture. The Digital Image Correlation (DIC) results illustrated the strain evolution process, showing progressive delamination for the [±30°₆/0°₂/±30°₆] configuration and catastrophic delamination for the [±30°₄/0°₂/±30°₄] configuration. The analytical approach offers a straightforward method for capturing failure modes and stress–strain responses, facilitating pseudo-ductility design in multidirectional laminates.

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.