机械零件的强度课件.ppt

外花鍵的有效應力集中係數kσ1.351.451.551.601.651.701.721.75軸的材料σB(MPa)40050060070080090010001200矩形齒2.12.252.362.452.552.652.702.8漸開線形齒1.41.431.461.491.521.551.581.6kτ公稱直徑12mm的普通螺紋的拉壓有效應力集中係數kσ3.03.94.85.2軸的材料σB(MPa)4006008001000DDd1.00.90.80.7020406080100120140ετ圓截面鋼材的扭轉剪切尺寸係數D/mm1.21.11.00.90.80.70.60.5020406080100120140鋼材的尺寸與截面形狀εσD/mmhhd=0d/D=0.60.70.80.9h螺紋聯接的尺寸係數10.810.760.710.680.630.600.570.540.520.50直徑d(mm)≤1620242832404856647280εσεσ零件與軸過盈配合處的kσ/εσH7/r62.252.502.753.003.253.503.754.25直徑d(mm)配合40050060070080090010001200σb(MPa)H7/k61.691.882.062.252.442.632.823.19H7/h61.461.631.791.952.112.282.442.76H7/r62.753.053.363.663.964.284.605.20H7/k62.062.282.522.762.973.203.453.90H7/h61.801.982.182.382.572.783.003.40H7/r62.953.283.603.944.254.604.905.60H7/k62.222.462.702.963.203.463.984.20H7/h61.922.132.342.562.763.003.183.643050100潘存雲教授研製潘存雲教授研製1.00.80.60.40.2400600800100012001400σB/Mpaβσ精車粗車未加工磨削拋光鋼材的表面品質係數βσ表面高頻淬火的強化係數βq7~201.3~1.630~401.2~1.57~201