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    <title>Von Mises on 贝格居笔记</title>
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      <title>螺栓预选（002）：折减系数 κ 详解</title>
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      <description>深入拆解螺栓预选中的折减系数 κ（Reduktionsfaktor）：从 von Mises 屈服准则出发，推导其定义、计算公式及工程应用，揭示螺纹摩擦如何削减螺栓的轴向承载能力。</description>
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