复合材料Ⅱ型分层ENF试验数据处理方法对比分析

doi:10.19936/j.cnki.2096-8000.20220728.013

摘要/Abstract

摘要： Ⅱ型分层是复合材料层板结构中常见的一种层间裂纹扩展模式,因此Ⅱ型层间断裂韧性是评估材料层间性能以及复合材料结构设计、分析不可或缺的力学性能参数。复合材料Ⅱ型层间断裂韧性测试有多种试验方法,其中以基于端部缺口梁三点弯曲(ENF)的试验方法最广泛。鉴于ENF试验中Ⅱ型分层驱动机制的复杂性和众多的影响因素,国内外研究人员提出了许多Ⅱ型层间断裂韧性的数据处理方法,在同一个ENF试验中采用不同的数据处理方法可能得到不一致的Ⅱ型层间断裂韧性测试结果。为了便于工程人员深入理解不同Ⅱ型层间断裂韧性数据处理方法的差异,本文首次系统地梳理了现存的各种基于ENF试验的Ⅱ型层间断裂韧性数据处理方法的力学原理、简化条件、推导过程,讨论了不同Ⅱ型层间断裂韧性数据处理方法的精度和适用范围,可为复合材料研制、测试、设计人员提供有用的指导。

关键词: 复合材料, 层板, 分层, 断裂韧性, 数据处理

Abstract: Mode Ⅱ delamination is a common failure mode in composite laminate structures, so the mode Ⅱ interlaminar fracture toughness is the important mechanical property parameter needed for characterizing the interlaminar properties of composites, and required by composite structure design. There are several test methods for mode Ⅱ interlaminar fracture toughness, among which the end notched flexure (ENF) test is widely adopted in engineer practice. As for the complex driving mechanism and lots of influence factors of mode Ⅱ delamination in ENF test, researchers have proposed many data reduction methods for mode Ⅱ fracture toughness, and the obtained data would be diverse when different data reduction methods were adopted. In order to help engineers to learn deeply the differences of various data reduction methods for mode Ⅱ fracture toughness, this paper firstly systematically reviewed the mechanics, simplification conditions, derivation process and precision of different data reduction methods of mode Ⅱ interlaminar fracture toughness in ENF test, for the purpose of offering useful guidance for engineers in the field of composite materials development, testing and design.

Key words: composite, laminate, delamination, fracture toughness, data reduction

中图分类号:

TB332

王雅娜, 赵魏. 复合材料Ⅱ型分层ENF试验数据处理方法对比分析[J]. 复合材料科学与工程, 2022, 0(7): 81-92.

WANG Ya-na, ZHAO Wei. Comparative analysis of data reduction method of ENF test of mode Ⅱ delamination[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(7): 81-92.

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