Anonymous
Anonymous asked in 科學其他:科學 · 1 decade ago

殘餘應變(residual strain)

在Stress-Strain Curve (材料特性圖)裡

殘餘應變(residual strain)的定義為何?

Update:

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    residual strain (permanent strain)殘留應變

    在應力-應變曲線(stress-strain curve) 中

    被定義為..當載重超過降伏應力(彈性與非彈性之分界點)...應變已進入塑性區時...若在此時卸載..則會產生殘留應變(也就是永久變形)....

    舉例來說...若是一條橡皮筋...小力拉扯時..橡皮筋還會回復到原來狀態...此時為彈性..也就是受力還沒超過降伏應力...

    但若是大力拉扯...橡皮筋可能會變形或拉斷...若是大力拉扯後橡皮筋變形但是沒有被拉斷..則這時候橡皮筋所產生的變形...也就是所謂的殘留應變(永久變形)...

    ..橡皮筋再也不會恢復到原來的形狀...

    Source(s): Mechanics of materials James M. Gere sixth edition chapter 1 section 1.4 page21
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