连续大开口复合材料层合板拉伸力学行为研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (3): 26-31.

连续大开口复合材料层合板拉伸力学行为研究

王力立¹, 付建伟², 薛俊川², 李新祥¹

1.中国飞机强度研究所全尺寸飞机结构静力/疲劳航空科技重点实验室,西安710065;
2.沈阳飞机设计研究所,沈阳110035

收稿日期:2018-06-25 出版日期:2019-03-28 发布日期:2019-03-28
作者简介:王力立(1984-),男,硕士,工程师,主要从事复合材料失效分析方面的研究,wangll623@163.com。

STUDY ON MECHANICAL BEHAVIOR OF COMPOSITE LAMINATE WITH CONTINUOUS LARGE CUTOUTS UNDER TENSION

WANG Li-li¹, FU Jian-wei², XUE Jun-chuan², LI Xin-xiang¹

1.Aeronautics Science and Technology Key Laboratory of Full Scale Aircraft Structure and Fatigue,Aircraft Strength Research Institute of China, Xi′an 710065, China;
2.Aircraft Design and Research Institute of Shenyang, Shenyang 110035, China

Received:2018-06-25 Online:2019-03-28 Published:2019-03-28

摘要/Abstract

摘要： 复合材料层合板作为飞机主承力构件使用时,常需在其上设置大开口以满足设备安装、检查维修等要求,但开口切断了纤维,导致结构局部应力和变形不连续,进而引发的应力集中使其力学行为复杂。针对机体主承力结构中含两个椭圆形大开口的复合材料层合板,采用试验与数值模拟相结合的方法,对其在拉伸载荷作用下的变形、传载以及应力集中现象进行了分析,并预测了结构损伤失效模式及破坏载荷。结果表明:复合材料层合板大开口附近应力分布复杂,应力集中导致开口周边区域易出现损伤,且损伤形式多样;尽管决定层合板极限强度的是纤维拉伸损伤失效,但泊松效应引起开口区过早出现的纤维挤压损伤不容忽视。

关键词: 复合材料层合板, 大开口, 拉伸试验, 失效分析

Abstract: Large cutout was usually needed to meet the equipment installation, inspection and maintenance requirements when composite laminates were used as the main bearing components in aircraft structure. However, when the fibers were cut off, the local stress and deformation of the structure were discontinuous, which lead to stress concentration and cause complex mechanical behavior. Experiments and finite-element-method (FEA) had been conducted to investigate the deformation, load transmission and stress concentration behavior of a stiffened composite laminate with two large elliptical cutouts under tension. Damage mode and fracture load of the structure were predicted. The results indicate that strain distribution nearby the large cutouts of composite laminate is complicated. The damage will easily occur around the cutout area due to stress concentration and damage mode are diversified. Although the ultimate strength of the laminate is determined by fiber tensile damage and failure but the premature fiber extrusion damage caused by Poisson effect in cutout area cannot be ignored.

Key words: composite laminate, large cutouts, tensile experiment, failure analysis

中图分类号:

TB332

王力立, 付建伟, 薛俊川, 李新祥. 连续大开口复合材料层合板拉伸力学行为研究[J]. 玻璃钢/复合材料, 2019, 0(3): 26-31.

WANG Li-li, FU Jian-wei, XUE Jun-chuan, LI Xin-xiang. STUDY ON MECHANICAL BEHAVIOR OF COMPOSITE LAMINATE WITH CONTINUOUS LARGE CUTOUTS UNDER TENSION[J]. Fiber Reinforced Plastics/Composites, 2019, 0(3): 26-31.

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