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| Vibration Fault Analysis for a Connector |
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| DOI：10.7643/issn.1672-9242.2023.01.005 |
| KeyWord:airborne module connector random vibration vibration fatigue life frequency domain method friction Gaussian interval method |
| Author | Institution |
| HE Lin-tao |
Southwest China Institute of Electronic Technology, Chengdu , China |
| REN Jian-feng |
Southwest China Institute of Electronic Technology, Chengdu , China |
| ZHANG Ke-fei |
Southwest China Institute of Electronic Technology, Chengdu , China |
| PENG Lei |
Southwest China Institute of Electronic Technology, Chengdu , China |
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| Abstract: |
| The work aims to analyze the main causes for failure of conductors in axial elastic contact connectors. With the failure of the connector of an airborne electronic module after functional vibration test as the research object, visual inspection, random vibration simulation analysis and force analysis were conducted to locate failure causes. Then, the fatigue life calculation formula of inner conductor was derived in combination with the stress-strain relation formula, the Gauss interval method and the Miner's cumulative damage law. The result showed that the vibration stress of the connector’s inner conductor was only 0.26 MPa, which was not enough to cause fatigue damage to the connector. However, under the vibration excitation, the connector had a large vibration displacement with the module, and the displacement exceeded the gap tolerance range of the connector, which caused a large reciprocating friction on the pressed end face of the inner conductor. The stress (250.13 MPa) on the root of the inner conductor which caused by friction exceeded the fatigue limit of the material, therefore the inner conductor had the risk of fatigue fracture. On this basis, the vibration fatigue life of the inner conductor was calculated to be 0.67 h, which was less than the functional vibration test time. The above results confirmed that the fatigue fracture of the inner conductor was caused by friction force of the vibration displacement. Attention must be paid to the harm of friction on axial elastic contact connectors. The reliability of connectors can be improved effectively by increasing the installation stiffness of modules. |
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