Journal
MATERIALS
Volume 12, Issue 13, Pages -Publisher
MDPI
DOI: 10.3390/ma12132064
Keywords
aluminum alloy; low-cycle fatigue loading; mechanical properties; material property test; finite element simulation
Categories
Funding
- National Natural Science Foundation of China [51778248]
- Natural Science Foundation of Fujian Province [2018J01075]
- Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University [ZQN-PY312]
- Research Trained Fund for Outstanding Young Researcher in Higher Education Institutions of Fujian Province, and Subsidized Project for Postgraduates' Innovative Fund in Scientific Research of Huaqiao University [18013086038]
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In this paper, the mechanical properties of 36 aluminum alloy specimens subjected to repeated tensile loading were tested. The failure characteristics, stress-strain hysteresis curves and its corresponding skeleton curves, stress cycle characteristics, and hysteretic energy of specimens were analyzed in detail. Furthermore, the finite element model of aluminum alloy specimens under low-cycle fatigue loading was established and compared with the experimental results. The effects of specimen parallel length, parallel diameter, and repeated loading patterns on the mechanical properties of aluminum alloys were discussed. The results show that when the specimen is monotonously stretched to fracture, the failure result from shearing break. When the specimen is repeatedly stretched to failure, the fracture of the specimen is a result of the combined action of tensile stress and plastic fatigue damage. The AA6061, AA7075, and AA6063 aluminum alloys all show cyclic softening characteristics under repeated loading. When the initial stress amplitude of repeated loading is greater than 2.5%, the repeated tensile loading has a detrimental effect on the deformability of the aluminum alloy. Finally, based on experiment research as well as the results of the numerical analysis, the calculation method for the tensile strength of aluminum alloys under low-cycle fatigue loading was proposed.
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