1第一章绪论题号页码1-3.....................................................................................................................................................11-5.....................................................................................................................................................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maxσ=100MPa，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NF和弯矩zM，其大小分别为200kNN10002m)0400m100.0(Pa)10100(212156maxN=×=××××==..AσFmkN333mN10333m)1000(N)10200(6161)32(33NN⋅=⋅×=×××==−=...hFhhFMz1-5板件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。2题1-5图解：平均正应变为33av,1000.1m100.0m100.1−−×=×=ABε33av,1000.2m100.0m102.0−−×=×=ADε由转角rad1000.20.100mm102.033−−×=×=ADαrad100010.100mm101033−−×=×=..αAB得A点处直角BAD的切应变为rad100013−×=−==.ααABADBADAγγ1第二章轴向拉压应力与材料的力学性能题号页码2-1.........................................................................................................................................................12-3.........................................................................................................................................................22-5.........................................................................................................................................................22-7.........................................................................................................................................................32-9.........................................................................................................................................................42-10................................................................................
