纤维增强复合材料力学性能统计相关性的实验鉴定

Experimental Identification of Statistical Correlation Between Mechanical Properties of FRP Composite.

作者信息

Zhang Shufeng, Xing Tongzhen, Zhu Haibin, Chen Xun

机构信息

Science and Technology on Integrated Logistics Support Laboratory, National University of Defense Technology, Changsha 410073, China.

School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100811, China.

出版信息

Materials (Basel). 2020 Feb 3;13(3):674. doi: 10.3390/ma13030674.

DOI:10.3390/ma13030674

PMID:32028624

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7040935/

Abstract

Recent prediction on the heavy statistical correlation between the mechanical properties of fiber reinforced composite (FRP) raises new concerns on the accurate reliability evaluation of composite structures, but such statistical correlation still lacks experimental verification. In this work, an experimental methodology is proposed to determine the statistical correlation between mechanical properties of unidirectional FRP composite. A rectangular shaped carbon fiber reinforced plastic (CFRP) specimen with a circular hole is loaded by tension, and 3D digital image correlation (DIC) is employed to characterize the heterogeneous strain field around the hole. Virtual field method (VFM) is used to derive , , , and of specimens. Specimen configuration considering fiber angle and hole diameter is optimized to achieve accurate determination of correlation coefficients. Experimental results on the linear correlation coefficients between , , , and agree well with previous theoretical predictions.

摘要

近期关于纤维增强复合材料（FRP）力学性能之间强统计相关性的预测引发了对复合结构准确可靠性评估的新担忧，但这种统计相关性仍缺乏实验验证。在这项工作中，提出了一种实验方法来确定单向FRP复合材料力学性能之间的统计相关性。对带有圆形孔的矩形碳纤维增强塑料（CFRP）试样进行拉伸加载，并采用三维数字图像相关（DIC）技术来表征孔周围的非均匀应变场。采用虚拟场方法（VFM）来推导试样的、、和。对考虑纤维角度和孔径的试样构型进行了优化，以实现相关系数的准确测定。关于、、和之间线性相关系数的实验结果与先前的理论预测吻合良好。