复合材料中空洞对湿热性能的影响机制及模拟

Effect Mechanism and Simulation of Voids on Hygrothermal Performances of Composites.

作者信息

Liu Zhu, Lei Yongpeng, Zhang Xiangyang, Kang Zhenhang, Zhang Jifeng

机构信息

Key Laboratory of Advanced Ship Materials and Mechanics, College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.

出版信息

Polymers (Basel). 2022 Feb 24;14(5):901. doi: 10.3390/polym14050901.

DOI:10.3390/polym14050901

PMID:35267726

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8912839/

Abstract

Voids are comment defects generated during the manufacturing process and highly sensitive to moisture in the hygrothermal environment, which has deleterious effects on the mechanical performances. However, the combined impact of void content and water-absorbed content on mechanical properties is not clear. Based on the random sequential adsorption algorithm, a microscale unit cell with random distribution of fibers, interfaces and voids was established. The quantitative effects of voids content on strength and modulus under the loading of transverse tension, compression and shear were investigated by introducing a degradation factor dependent on water content into the constitutive model, and the different failure mechanisms before and after hygrothermal aging were revealed. Conclusively, before hygrothermal aging, voids induce the decrease in mechanical properties due to stress concentration, and every 1% increase in the void content results in a 6.4% decrease in transverse tensile strength. However, matrix degradation due to the absorbed water content after hygrothermal aging is the dominant factor, and the corresponding rate is 3.86%.

摘要

孔隙是在制造过程中产生的缺陷，对湿热环境中的水分高度敏感，这对力学性能有有害影响。然而，孔隙率和吸水量对力学性能的综合影响尚不清楚。基于随机顺序吸附算法，建立了纤维、界面和孔隙随机分布的微观尺度单胞。通过在本构模型中引入依赖于含水量的降解因子，研究了孔隙率对横向拉伸、压缩和剪切载荷下强度和模量的定量影响，并揭示了湿热老化前后不同的破坏机制。结果表明，在湿热老化之前，孔隙由于应力集中导致力学性能下降，孔隙率每增加1%，横向拉伸强度下降6.4%。然而，湿热老化后由于吸水量导致的基体降解是主要因素，相应的速率为3.86%。