第二章 轴向拉压应力与材料的力学性能

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1、第二章轴向拉压应力与材料的力学性能题号页码2-3.........................................................................................................................................................12-5...............................................................................

2、..........................................................................22-7.........................................................................................................................................................22-9.........................

3、................................................................................................................................32-10...............................................................................................................................

4、........................32-15.......................................................................................................................................................42-16...........................................................................

5、............................................................................52-18.......................................................................................................................................................62-19.......................

6、................................................................................................................................72-21...............................................................................................................................

7、........................72-22.......................................................................................................................................................8（也可通过左侧题号书签直接查找题目与解）2-3图示轴向受拉等截面杆，横截面面积A=500mm2，载荷F=50kN。试求图示斜截面m-m上的正应力与切应力，以及

8、杆内的最大正应力与最大切应力。9解：该拉杆横截面上的正应力为题2-3图99σ=F=50×103N=1.00×108Pa=100MPa9A500×10－6m2斜截面m-m的方位角α=−50o，故有ασ=σcos2α=100MPa⋅cos2(−50o)=41.3MPaτ=σsin2α=50MPa⋅sin(−100o)=−49.2MPaα2杆内的最大正应力与