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扭轉(英語:torsion)在固體力學領域,是指一個對象由於受到扭矩而发生变形。扭矩的单位是牛頓米(N·m)。在垂直於轉矩軸的截面产生的剪應力垂直於半徑。 [1]
其中
对于薄壁梁,其橫截面是否封閉,对抗扭性影响很大。例如,一個壁厚為半徑的10%圓管,封閉橫截面比開槽橫截面的圆管抗扭性大300倍[3]。
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