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基于DIC與Irwin模型的工業(yè)純鈦疲勞裂紋尖端循環(huán)應(yīng)變場表征
作者:
作者單位:

1.江蘇理工學(xué)院機(jī)械工程學(xué)院;2.金陵科技學(xué)院機(jī)電工程學(xué)院

作者簡介:

通訊作者:

中圖分類號:

TG146.2+3

基金項(xiàng)目:

國家自然科學(xué)基金資助(51805230；52075232),江蘇省研究生科研與實(shí)踐創(chuàng)新計(jì)劃項(xiàng)目(SJCX20_1038)


Characterization of Cycle Strain Field of Commercial Pure Titanium at Fatigue Crack Tip Based on DIC and Irwin model
Author:
Affiliation:

1.School of Mechanical Engineering,Jiangsu University of Technology;2.School of Electrical Engineering,Jinling Institute of Technology

Fund Project:

The National Natural Science Foundation of China (51805230; 52075232); Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJCX20_1038)

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    摘要:

    為了實(shí)現(xiàn)工業(yè)純鈦TA2疲勞裂紋尖端循環(huán)應(yīng)變場的表征,本文采用數(shù)字圖像相關(guān)(Digital image correlation, DIC)方法并結(jié)合Irwin模型,研究了TA2緊湊拉伸試樣在相續(xù)疲勞載荷下的裂紋擴(kuò)展規(guī)律、循環(huán)應(yīng)變場的實(shí)驗(yàn)劃分方法以及循環(huán)應(yīng)變環(huán)的演化規(guī)律。首先通過相續(xù)疲勞試驗(yàn)獲得了TA2緊湊拉伸試樣的疲勞裂紋擴(kuò)展規(guī)律,在此基礎(chǔ)上結(jié)合DIC和Irwin模型,建立了疲勞裂紋尖端循環(huán)應(yīng)變場的實(shí)驗(yàn)劃分方法,實(shí)現(xiàn)了循環(huán)塑性區(qū)、單調(diào)塑性區(qū)和彈性區(qū)的劃分。另一方面采用DIC獲得不同區(qū)域的滯回應(yīng)變環(huán),討論了不同區(qū)域應(yīng)變環(huán)的差異,從而論證了劃分方法的有效性,并且揭示了裂紋擴(kuò)展過程中裂紋尖端應(yīng)變場從彈性區(qū)、單調(diào)塑性區(qū)到循環(huán)塑性區(qū)的演化規(guī)律。本文研究工作實(shí)現(xiàn)了TA2疲勞裂紋擴(kuò)展過程中裂紋尖端循環(huán)應(yīng)變場的表征,能夠滿足疲勞裂紋擴(kuò)展研究的需要。

    Abstract:

    In order to realize the characterization and regional division of cyclic strain field at fatigue crack tip, digital image correlation (DIC) method and Irwin model were used to study the crack growth law, experimental division method of cyclic strain field and the evolution law of cyclic strain loops of commercial pure titanium TA2 compact tensile specimen under continuous fatigue loads. Firstly, the fatigue crack growth law of TA2 compact tensile specimen was obtained by the continuous fatigue experiment. On this basis, combining DIC method and Irwin model, the experimental division method of cyclic strain field at fatigue crack tip was established, and the division of cyclic plastic zone, monotonic plastic zone and elastic zone was realized. On the other hand, the hysteresis loops in different regions were obtained by DIC method, and the differences of strain loops in different regions were discussed. Thus the effectiveness of the division method was demonstrated, and the evolution law of strain field at crack tip from elastic zone, monotonic plastic zone to cyclic plastic zone during crack growth was revealed. The research work in this paper provides an experimental method to characterize the cyclic strain field at crack tip for the study of fatigue crack growth behavior, which can meet the needs of the experimental study of fatigue crack growth.

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引用本文

代巧,何爵亨,周金宇,陳曉陽,姜學(xué)艷.基于DIC與Irwin模型的工業(yè)純鈦疲勞裂紋尖端循環(huán)應(yīng)變場表征[J].稀有金屬材料與工程,2021,50(8):2815~2822.[Dai Qiao, He Jueheng, Zhou Jinyu, Chen Xiaoyang, Jiang Xueyan. Characterization of Cycle Strain Field of Commercial Pure Titanium at Fatigue Crack Tip Based on DIC and Irwin model[J]. Rare Metal Materials and Engineering,2021,50(8):2815~2822.]
DOI：10.12442/j. issn.1002-185X.20200656

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  • 收稿日期:2020-09-01
  • 最后修改日期:2020-09-27
  • 錄用日期:2020-10-21
  • 在線發(fā)布日期: 2021-09-07
  • 出版日期: 2021-08-31