航空学报 > 2023, Vol. 44 Issue (12): 227671-227671   doi: 10.7527/S1000-6893.2022.27671

固体力学与飞行器总体设计

以能量表征的平面应变及平面应力Ⅰ型裂纹J积分解

冯子夜, 蔡力勋(), 于思淼   

  1. 西南交通大学 力学与航空航天学院,成都 610031
  • 收稿日期:2022-06-22 修回日期:2022-08-02 接受日期:2022-09-30 出版日期:2022-10-27 发布日期:2022-10-26
  • 通讯作者: 蔡力勋 E-mail:lix_cai@263.net
  • 基金资助:
    国家自然科学基金(11872320)

Energy⁃based J⁃integral solutions for mode⁃I cracked specimens under plane strain and plane stress

Ziye FENG, Lixun CAI(), Simiao YU   

  1. School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 610031,China
  • Received:2022-06-22 Revised:2022-08-02 Accepted:2022-09-30 Online:2022-10-27 Published:2022-10-26
  • Contact: Lixun CAI E-mail:lix_cai@263.net
  • Supported by:
    National Natural Science Foundation of China(11872320)

摘要:

J积分用于表征Ⅰ型裂纹尖端应力应变场程度,并用于在裂纹启裂与准静态扩展下确定材料弹塑性初始断裂韧度和扩展断裂韧度(J阻力曲线)。基于能量密度等效,考虑有效变形体积的尺寸效应对含裂纹试样能量的影响,提出了平面应变及平面应力下描述Ⅰ型裂纹试样J积分与试样尺寸、材料参数、应变能之间关系的半解析能量解。针对不同材料、不同几何尺寸的6类Ⅰ型裂纹试样,基于本文模型预测的J积分-能量关系与有限元分析结果密切吻合。

关键词: J积分, I型裂纹, 弹塑性, 平面应变, 平面应力

Abstract:

J-integral is used to characterize the degree of stress and strain field at the tip of mode-I crack, and to determine the initial elastic-plastic fracture toughness and extended fracture toughness (J-resistance curves) of the material under crack initiation and quasi-static propagation. Based on energy density equivalence, a semi-analytical energy model is proposed to describe the relationship between J-integral, energy, the dimensions and material parameters for a mode-I cracked specimen under plane strain and plane stress. The J-integral-energy relationships of the six specimens for different materials and dimensions predicted by the presented model are in close agreement with the results given by finite element analysis.

Key words: J-integral, mode-I crack, elastoplasticity, plane strain, plane stress

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