第二章拉伸压缩、剪切少学时工程力学

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3、 25kN20kN(kN)50Nmax F2022-3-320FFabcd2022-3-321FFabcda b c d 2022-3-322 F FN2022-3-323AFN 2022-3-324Nmaxmax AFNmax FA NmaxAF AFmaxN 2022-3-325FABCFF3000400037024021kNN50501 1 FFkNN1 15 50 03 32 2 FF2022-3-326FABCFF300040003702402150kN150kNMPa.N/m.2N8 87 70 01 10 08 87 70 02 24 40 02 24 40 05 50 00 0

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8、-358F1F2F3l1l2l3ABCD2022-3-359F1F2F3l1l2l3ABCD15+-20502022-3-360FCB =-15kN ( - )FAB =20kN （+）FDC =- 50kN ( - )F1F2F3l1l2l3ABCD)(MPa8 .1761 AFABAB )(MPa5 .1103 AFDCDC 2022-3-361F1F2F3l1l2l3ABCDm102.534-N 1 11 11 1EAlFlABm101.424-N 2 22 22 2EAlFlBCm101.584-N 3 33 33 3EAlFlCD-0.3mm BCCDBllumm10-0.474-

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