SSF Method for Fatigue Analysis of Mechanically Fastened Hybrid-material Structures at Different Temperatures

doi:10.3901/JME.2024.18.138

Abstract

Abstract: To evaluate the influence of ambient temperature change on fatigue performance of mechanically fastened hybrid-material structures, a stress-severity-factor (SSF) method is proposed for the fatigue analysis of mechanically fastened hybrid-material structures. Considering the thermal deformations of different materials at different ambient temperatures, the calculation model of bolt loads and bypass loads for the multi-row-bolt-fastened hybrid-material structures is established. Then, the SSF value of hazard details is defined and calculated, and fatigue lives of fastened structure at different ambient temperatures can be estimated based on S-N curves of the materials. Fatigue tests of 7050-T7451 aluminum alloy/CFRP laminate three-bolt single-lapped hybrid fastened specimens are carried out at different ambient temperatures to verify the proposed fatigue life analysis method. The results show that the thermal deformation difference of different materials will affect the force-transfer behavior of structure, and then the structure show different SSF values at different ambient temperatures. The relative errors between the prediction results and test results of fatigue lives are less than ±20%. The method is convenient and efficient, which provides a strong support for the fatigue life analysis of mechanically fastened hybrid-material structures under the complex environments.

Key words: hybrid material, mechanical fastening, ambient temperature, fatigue life, stress severity factor

CLC Number:

V215

CAO Jing, YAO Weixing, LIANG Deli, WANG Binwen. SSF Method for Fatigue Analysis of Mechanically Fastened Hybrid-material Structures at Different Temperatures[J]. Journal of Mechanical Engineering, 2024, 60(18): 138-145.

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