汇报时间：2023年8月29日（星期二）下午15:00

汇报地点：创新港 2号巨构 2-6F-075会议室

汇报人：宋心仪

国际会议信息

会议名称：The 23rd International Conference on Composite Materials

会议时间：30 July-4 August，2023

会议地点：ICC Belfast

会议简介：The 23rd International Conference on Composites Materials (ICCM 23) is the premier international conference in the field of composite materials and was first held in 1975 in the cities of Geneva and Boston. Since that time the conference has been held biennially in North American, European, Asian, Oceanic and African cities. The event will attract the leading researchers and practitioners, to report and exchange ideas on the latest developments in the advancement and exploitation of a wide range of composites materials and structures.

参会论文信息

Title：Multi-scale Analysis of Mechanical Properties of Three-dimensional Braided Ceramic Matrix Composites with Pore Defects

Author：Xinyi Song, Shenghao Zhang, Di Zhang, Jin Zhou, Xuefeng Chen, Zhongwei Guan , W. J. Cantwell

Abstract: The multi-scale finite element model is developed to investigate the strength and damage behavior of 3D braided composites with pore defects. The pore defects inside the composites are inspected and measured using CT scan. Based on the void data, the trans-scale numerical models are established, including the interface. Damage evolution under longitudinal tensile loading was evaluated. The effective properties are transferred from the fibre bundle scale to the mesoscale using the machine learning-based clustering method and further, the finite element model with pore defects is used to predict the macroscopic mechanical properties. Periodical boundary conditions are applied to the multiscale FE models by the coupling and constraint equation, with defining commands available in Abaqus.
It has been shown that the failure modes of yarn damage, matrix cracking and interface debonding are recognized and correspond well with the final failure morphology of the sample. The damage appears around the pore defects and then develops to the weak region in the matrix. Pore defects of the composites have a significant influence on the tensile behaviour of the composite, which is captured by the proposed multi-scale damage model. The porosity has a greater influence on the strength of the composite, in which the pore content increases by 10 % and the strength of the composite decreases 12 % approximatively. The validated models can be further used to predict the mechanical property of 3D braided composites with pore defects

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