CHARACTERIZATION OF NOTCH FATIGUE CRACK INITIATION AND PROPAGATION OF INDUSTRIAL PURE TITANIUM BASED ON DIC

BAO QiLe; DAI Qiao; QIU Rui

doi:10.16579/j.issn.1001.9669.2024.05.030

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CHARACTERIZATION OF NOTCH FATIGUE CRACK INITIATION AND PROPAGATION OF INDUSTRIAL PURE TITANIUM BASED ON DIC

Research Notes | 更新时间：2025-04-27

- CHARACTERIZATION OF NOTCH FATIGUE CRACK INITIATION AND PROPAGATION OF INDUSTRIAL PURE TITANIUM BASED ON DIC
- Journal of Mechanical Strength Vol. 46, Issue 5, Pages: 1258-1264(2024)
- 作者机构：
  
  江苏理工学院机械工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2024.05.030
  CLC： TH114;TH142.3
- Published：15 October 2024
- 稿件说明：
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BAO QiLe, DAI Qiao, QIU Rui. CHARACTERIZATION OF NOTCH FATIGUE CRACK INITIATION AND PROPAGATION OF INDUSTRIAL PURE TITANIUM BASED ON DIC[J]. Journal of mechanical strength , 2024, 46(5): 1258-1264.
DOI：

BAO QiLe, DAI Qiao, QIU Rui. CHARACTERIZATION OF NOTCH FATIGUE CRACK INITIATION AND PROPAGATION OF INDUSTRIAL PURE TITANIUM BASED ON DIC[J]. Journal of mechanical strength , 2024, 46(5): 1258-1264. DOI： 10.16579/j.issn.1001.9669.2024.05.030.

摘要

对工业纯钛缺口试样进行疲劳试验

结合数字图像相关(Digital Image Correlation

DIC)技术获取试样表面应变场、缺口根部局部应变和疲劳裂纹扩展长度

划分疲劳裂纹萌生与扩展阶段

并对各阶段进行表征。试验结果表明

在疲劳裂纹萌生阶段

基于DIC获得的应变集中系数随缺口半径的减小而增加

与理论应力集中系数具有一致性;当缺口根部循环应变累积至一定程度时萌生微观裂纹

此时载荷增大

局部应变速率急剧增大后短暂减小再增大

直至宏观裂纹出现;当宏观裂纹出现时

采用应力强度因子对TA2疲劳裂纹扩展进行表征

应力强度因子随载荷和裂纹长度的增加而增大。结果表明

基于DIC技术能够对缺口疲劳裂纹萌生及扩展进行表征

能够为钛制设备的安全评定提供依据。

Abstract

The fatigue test of industrial pure titanium notched specimens was carried out.Combined with digital image correlation(DIC)technology

the surface strain field of the specimen

the local strain at the notch root

and the fatigue crack propagation length were obtained

and the fatigue crack initiation and propagation stages were divided and characterized.The experimental results show that

in the fatigue crack initiation stage

the strain concentration factor obtained by DIC increases as the notch radius decreases

which is consistent with the theoretical stress concentration factor.When the cyclic strain at the notch root accumulates to a certain extent

the micro-cracks initiate.At this time

the increase of load causes the local strain rate to increase sharply

then decrease briefly and increases again until the appearance of macro-cracks.When macro-cracks appear

the fatigue crack propagation of TA2 is characterized by the stress intensity factor

which increases with the increase of load and crack length.The results show that the notch fatigue crack initiation and propagation can be characterized based on DIC technology

which can provide a basis for the safety assessment of titanium equipments.

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