| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 103 === Mating and unmating force tests are one of the critical inspections for connectors before launching to the market. Proper force performance can be obtained by selecting the appropriate materials and optimizing the structure of contact spring. To analyze the structure of contact spring, finite element analysis (FEA) is widely used in the design stage. The objective of this paper is to identify the validation of FEA model to obtain more accurate results of the parametric contact spring analysis. The first part is to conduct the material tests to modify the cantilever beam model in ANSYS Workbench. We compared FEA model with different element types, and material models. The results of model validation showed that the analysis error for SUS301 model and POM model is within 11 %. The second part is to present a parametric model of contact spring to analyze the MF&UF. The results of stiffness test showed that SUS301 3/4H has significant Bauschinger effect and two-steps bending process can improve the backward strength of contact spring. Therefore, the kinematic hardening material model including the Bauschinger effect is used. Residual analysis showed that considering the residual stress of contact spring during the bending and assembly process can make the FEA results more close to the experimental results and the analysis error is within 10 %. To optimize the structure of contact spring, the parameter correlation method is used to identify the important dimensions of contact spring and the design of experiment is employed to construct the response surface. Finally, we developed a program based on the response surface to modify the designated MF&UF and permanent set by entering the dimensions of contact spring.
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