材料力学作业 第五版 刘鸿文 答案

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28

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29

;M*ij.ffJi!fffl ~BBi.E$j] [<1] = 170 MPa, i!ffflt)]J.§ZjJ [r] =100 MPa 0 ~m~I*~a

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40

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\ _\ 30 MPa

50MPa 160 MPa .

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rl ((_ -.--_ /70 MP,

v~.X' =-§:lbV j:jf~l!J~+1~t / 70 Ml~

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