FATIGUE TEST AND FINITE ELEMENT ANALYSIS ON MSD OF STRUCTURE CONTAINING MULTI-ROW HOLES

SUN HanBin; DONG DengKe; CHEN Li; CHANG WenKui

doi:10.16579/j.issn.1001.9669.2020.04.010

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FATIGUE TEST AND FINITE ELEMENT ANALYSIS ON MSD OF STRUCTURE CONTAINING MULTI-ROW HOLES

更新时间：2022-09-22

- FATIGUE TEST AND FINITE ELEMENT ANALYSIS ON MSD OF STRUCTURE CONTAINING MULTI-ROW HOLES
- Journal of Mechanical Strength Vol. 42, Issue 4, Pages: 826-830(2020)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2020.04.010
  CLC：
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SUN HanBin, DONG DengKe, CHEN Li, et al. FATIGUE TEST AND FINITE ELEMENT ANALYSIS ON MSD OF STRUCTURE CONTAINING MULTI-ROW HOLES. [J]. 42(4):826-830(2020)
DOI：

SUN HanBin, DONG DengKe, CHEN Li, et al. FATIGUE TEST AND FINITE ELEMENT ANALYSIS ON MSD OF STRUCTURE CONTAINING MULTI-ROW HOLES. [J]. 42(4):826-830(2020) DOI： 10.16579/j.issn.1001.9669.2020.04.010.

摘要

基于无预制裂纹3排平行孔平板的疲劳试验,对含相似应力水平的多细节结构产生多处损伤(Multiple Site Damage,MSD)的规律进行了研究。为了研究产生MSD结构中裂纹之间的干涉影响,利用Franc2D/L对主裂纹、等长双侧裂纹,等长单双裂纹、单孔等长双裂纹四种开裂模式的裂纹应力强度因子进行了计算分析。计算结果表明:裂纹扩展初期,裂纹主要受到自身开裂孔的干涉影响,四种模式下裂纹的无量纲应力强度因子比较相近;随着裂纹长度的增加,试验和有限元结果都表明了裂纹间的干涉影响显著加快了裂纹的扩展速度。

Abstract

Based on the fatigue test of three-row parallel holes without prefabricated cracks,the law of multiple site damage（MSD） for multi-detail structures with similar stress levels was studied. In order to study the interference effect between the cracks in the MSD structure,the FRANC2 D/L was used to calculate and analyze the crack stress intensity factor of four cracking modes:main crack,equal-length double-sided crack,equal-length single-double crack and single-hole isometric crack. The calculation results show that the crack is mainly affected by the interference of the stress concentration of the cracked hole in the initial stage of crack propagation. The dimensionless stress intensity factors of the cracks are similar in the four modes. As the crack length increases,both the test and finite element results show that the interference between the cracks significantly accelerates the crack propagation rate.

关键词

多处损伤含孔结构Franc2D/L裂纹干涉影响应力强度因子

Keywords

Multiple site damageStructure containing holesFRANC2D/LCrack interferenceStress intensity factor

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Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology

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