小型連接器彈簧片之疲勞壽命分析與預估

Analysis and Estimation of Fatigue Life for Small Connector Springs

黃宜芬(Yi_Fen_Huang)

指導教授 ： 陳政順

國立臺北科技大學/機電學院/製造科技研究所/碩士(2009年)

摘要

早期的連接器彈簧片大都為簡單的彈臂式，近年隨著電子產品輕薄短小的趨勢，連接器的設計空間更有限，彈簧片的型式由簡單的彈臂式延伸為多彎折彈簧片型式，為了能加快彈簧片的設計以及減低成形時間和製造成本，本文利用有限元素分析軟體ABAQUS，分析彈簧片在反覆負荷過程中，產生的等效應力，並配合疲勞壽命理論預估彈簧片之疲勞壽命，最後實際做出樣品測試。
本研究首先針對彈簧片在三個不同壓縮量下之應力應變行為進行分析，且由正向力之實驗測試驗證正向力之模擬值與實驗值，誤差介於1.70~6.20%間。在疲勞壽命預估方面，三個壓縮量所對應之壽命預估值與實驗之比較，得知Soderberg 疲勞方程式的壽命計算值較實驗測試值之誤差介於0.45~0.81倍之間；而Goodman疲勞方程式的壽命計算值較實驗測試值之誤差介於0.91~2.27倍之間。由此顯示在此個案，相對於Goodman，Soderberg有較佳的壽命預估值。

關鍵字

有限元素 ； 疲勞 ； 連接器彈簧片

並列摘要

In recent years, electronic products are in the trend of tiny and light weight. Therefore, the design space of the connector is becoming restricted. Geometric shapes of springs become more complicated and increase the difficulty of design and fatigue life analysis. Therefore, the purpose of this study is to study the stress distribution and fatigue life of such kind of connector springs. Commercial finite element software (ABAQUS) is used to analyze the stress and deformation responses and the stress life theory including mean stress effect like the Soderberg and Goodman equations are used to estimate the fatigue life of the connector springs designed.
In this case study, stress and force analyses of the springs had been performed under three different compressive displacement of interest. And the normal forces obtained from analyses have a good agreement with those obtained from force–displacement tester used in industry. For fatigue life calculation, the results also show that the fatigue lives of springs under three different loadings from the Soderberg equation are within a factor of 0.45~0.81 compared to those obtained from experimental test. And the fatigue lives from Goodman equations are within a factor of 0.91~2.27. Therefore, in this case study, it is evident that fatigue life prediction from the Soderberg equation yields better results than the Goodman equations.

並列關鍵字

Finite element method ； Fatigue ； Connector spring

參考文獻

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