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Study on the influence of sample size and roughness on fatigue performance of 7085 aluminum alloy
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Ke YUAN1, Dong GAO2, Mei YIN1, Tingting LU1, Liling ZHENG2, Yang LÜ2, Yue CUI2, Fengluan ZHOU2
Journal of Mechanical Strength | 2025, 47(7) : 80 - 85
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Journal of Mechanical Strength | 2025, 47(7): 80-85
• ·Fatigue·Damage·Fracture·Failure Analysis· •
Study on the influence of sample size and roughness on fatigue performance of 7085 aluminum alloy
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Ke YUAN1, Dong GAO2, Mei YIN1, Tingting LU1, Liling ZHENG2, Yang LÜ2, Yue CUI2, Fengluan ZHOU2
Affiliations
  • 1.AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
  • 2.AVIC Touchstone Testing Innovation (Dachang) Co., Ltd., Langfang 065300, China］
Published: 2025-07-15 doi: 10.16579/j.issn.1001.9669.2025.07.010
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The fatigue limit of 7085 aluminum alloy was tested by four-point bending fatigue test for samples of different sizes and roughness. The results show that the greater the thickness of the specimen, the greater the ultimate fatigue strength of the material. The higher the surface roughness of the sample, the lower the ultimate fatigue strength of the material. The stress analysis and calculation of the specimen show that the dangerous cross section occurs at the position where the indenter contacts the specimen, where the specimen is subjected to the combined action of bending normal stress and shear force. With the increase of the thickness of the specimen, the shear force on the specimen decreases, and the bending normal stress on the specimen increases under the same fatigue limit. And vice versa. The relation between the surface roughness and the radius of curvature of the sample is shown by establishing a simplified model, and then the relationship between the surface roughness and the fatigue ultimate strength of the material is obtained.

7085 aluminium alloy  /  Four-point bending test  /  Fatigue limit  /  Sample thickness  /  Roughness
Ke YUAN, Dong GAO, Mei YIN, Tingting LU, Liling ZHENG, Yang LÜ, Yue CUI, Fengluan ZHOU. Study on the influence of sample size and roughness on fatigue performance of 7085 aluminum alloy[J]. Journal of Mechanical Strength, 2025 , 47 (7) : 80 -85 . DOI: 10.16579/j.issn.1001.9669.2025.07.010
Funding
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  • National Science and Technology Major Project(J2019-VIII-0002-0163)
Appendix
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Year 2025 volume 47 Issue 7
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.07.010
  • Receive Date：2023-10-31
  • Online Date：2026-03-19
  • Published：2025-07-15
Article Data
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History
  • Received：2023-10-31
  • Revised：2024-02-21
Funding
National Science and Technology Major Project(J2019-VIII-0002-0163)
Affiliations
    1.AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
    2.AVIC Touchstone Testing Innovation (Dachang) Co., Ltd., Langfang 065300, China］

Corresponding:

YUAN Ke, E-mail：
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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