短碳纤维增强铜复合材料的计算细观力学模型及力学性能

doi:10.19976/j.cnki.43-1448/TF.2022016

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Abstract For the short carbon fiber reinforced copper matrix composites (C_Sf/Cu) prepared by powder metallurgy, a model was established to analyze the tensile damage evolution, fracture mechanical behavior and the influence of weak interface on mechanical properties of composites. The results show that the composites can be divided into elastic stage, plastic hardening stage, damage initiation stage, and damage evolution stage. The stress concentration at the fiber end causes the debonding of the end interface, the damage evolution of the axial interface and the fiber bridging. The damage of the matrix and the accompanying interface are the main fracture mechanism of the material. When the fiber length is greater than 60 μm, the axial stress of the fiber presents a “w” shape, and the fiber has a strong bearing capacity. When the fiber length is 20 μm, the fiber has almost no bearing capacity. The higher the load on the fiber, the easier it is to cause interfacial damage. With increasing fiber length from 20 μm to 140 μm, the strength of the composite decreases from 146 MPa to 102 MPa.

Key words： short fibers copper matrix composites meso-mechanics finite element cohesive element

Received: 08 March 2022 Published: 14 September 2022

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	HE Donglang
	FANG Huachan
	LI Yuxing
	LI Jinwei

Cite this article:

HE Donglang,FANG Huachan,LI Yuxing, et al. Computational meso-mechanical model and mechanical property of short carbon fiber reinforced copper matrix composites[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(4): 382-388.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022016 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I4/382

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