RESEARCH ON FATIGUE PROPERTIES OF 7075-T651 ALUMINUM ALLOY CONSIDERING THE EFFECT OF MEAN STRESS

doi:10.16579/j.issn.1001.9669.2024.02.025

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RESEARCH ON FATIGUE PROPERTIES OF 7075-T651 ALUMINUM ALLOY CONSIDERING THE EFFECT OF MEAN STRESS

更新时间：2024-07-05

- RESEARCH ON FATIGUE PROPERTIES OF 7075-T651 ALUMINUM ALLOY CONSIDERING THE EFFECT OF MEAN STRESS
- Journal of Mechanical Strength Vol. 46, Issue 2, Pages: 446-452(2024)
- 作者机构：
  
  1. 上海理工大学机械工程学院
  2. 北汽福田汽车股份有限公司时代领航卡车工厂
  3. 机械工业汽车机械零部件强度与可靠性评价重点实验室
  4. 上海市新能源汽车可靠性评价公共技术平台
- 作者简介：
- 基金信息：
  
  The project supported by the National Natural Science Foundation of China (No.52005336), the China Postdoctoral Science Foundation (No.2020M671167), and the Shanghai Sailing Program (No. 19YF1434400).
- DOI：10.16579/j.issn.1001.9669.2024.02.025
  CLC： TG146.2
- Published：15 April 2024，
- 稿件说明：
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RESEARCH ON FATIGUE PROPERTIES OF 7075-T651 ALUMINUM ALLOY CONSIDERING THE EFFECT OF MEAN STRESS. [J]. Journal of Mechanical Strength , 2024,46(2):446-452.
DOI：

RESEARCH ON FATIGUE PROPERTIES OF 7075-T651 ALUMINUM ALLOY CONSIDERING THE EFFECT OF MEAN STRESS. [J]. Journal of Mechanical Strength , 2024,46(2):446-452. DOI： 10.16579/j.issn.1001.9669.2024.02.025.

摘要

研究了平均应力效应对 7075-T651铝合金疲劳性能的影响，选取了

=0.5、0.3、0.1和-0.1四组应力比进行疲劳试验。结果表明，同一应力比下，随着峰值应力水平的增加，疲劳寿命逐渐降低；而同一峰值应力水平下，随着应力比的提高，疲劳寿命则呈现出逐渐升高的趋势。同时，使用扫描电子显微镜（Scanning Electron Microscopy，SEM）观察疲劳断口形貌发现，在峰值应力相同的情况下，裂纹萌生及扩展区的扇形面积随平均应力的增大而增大。最后，基于7075-T651铝合金疲劳实验结果，提出了一种考虑

的改进型预测模型，结果对比显示相较于其他模型，此模型在一定程度上对7075-T651铝合金具有更好的疲劳寿命预测效果。

Abstract

In this study

the effect of average stress on the fatigue properties of 7075-T651 aluminum alloy was studied

and four stress ratios of

= 0.5

0.3

0.1 and -0.1 were selected for fatigue experiments. The results show that under the same stress ratio

with the increase of the peak stress level

the fatigue life gradually decreases

under the same peak stress level

with the increase of the stress ratio

the fatigue life shows a trend of increasing gradually. At the same time

using the scanning electron microscopy (SEM) to observe the fatigue fracture morphology

it is found that under the same peak stress

the sector area of the crack initiation and propagation zone increases with the inerease of the average stress. Finally

based on the fatigue test results of 7075-T651 aluminum alloy

an improved prediction model considering

is proposed in this paper. The comparison results show that this model has better prediction effect to a certain extent than other models.

关键词

7075-T651铝合金平均应力疲劳寿命断口形貌预测模型

Keywords

7075-T651 aluminum alloyAverage stressFatigue lifeFracture morphologyPrediction model

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