单辉祖《材料力学》课后习题答案.doc

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1、单辉祖《材料力学》课后习题答案1（也可通过左侧题号书签直接查找题目与解）1-3图示矩形截面杆，横截面上的正应力沿截面高度线性分布，截面顶边各点处的正应力均为σmax100MPa，底边各点处的正应力均为零。试问杆件横截面上存在何种内力分量，并确定其大小。图中之C点为截面形心。题1-3图解：由题图所示正应力分布可以看出，该杆横截面上存在轴力FN和弯矩Mz，其大小分别为11NFNσmaxA×100×1062×0.100m×0.040m2.00×105N200kN22mhh11MzFNFNh×200×103N×0.100m3.33×103Nm3.33kNm

2、23661-4板件的变形如图中虚线所示。试求棱边AB与AD的平均正应变以及A点处直角BAD的切应变。1题1-4图解：平均正应变为0.1×10-3mεABεx1.00×1030.100m0.2×103mεADεy2.00×1030.100m由转角0.2×103mαAD2.00×103rad0.100m0.1×103mαAB1.00×103rad0.100m得A点处直角BAD的切应变为γAγBADαADαAB1.00×103rad2第二章轴向拉压应力与材料的力学性能题号页码2-3.....................................

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