材料力学第十章动荷载

1、2022-5-3 PaxmmPPaxmmagPNstFxmmPAg xmmAgAa agPP NdFPa)(1(NdAgxPgaF AgxPF NstagPNstF)(1(NdAgxPgaF AgxPF NstNstdNdFKF stdNstdNdd KAFKAF stdd KxmmPAg xmmAgAa agPP NdF stddK xmmAg AaAg agPP PNdFNstF1daKg NstNdstdFlFlEAEA Nd d stddNststFKF()()Nd1aFGqlg()()Ndd11FaGqlAAg )8 . 921)(605 .251050(109 . 2134 214

2、MPa300MPa rO rO rO qd2)2)(1(22dDADAq 2n2 Da OqdyFd d d(d )2Dq FNdFNd4222dNdDAFF 2)2)(1(22dDADAq 2 dsin4 sin)d2(220220ddDADADqF 422NddDAF Fdoqdy d FNdFNd422ddDAF 2dv )d2(d Dq2Dv 2 vd FGlO22nGFmaRmlG/g AFG/ ( )2GFGlAg 机械能守恒定律机械能守恒定律dVVT 假设假设 (Assumption)hvh33/48/eePPFlFlEAEA lFlFEIEI lM lMGIGIl hd0T)(

3、d hPVdd d1VF2 dd d()1P hF2d d stFP dd stFP d st d d 21)(PhP hddVVT dV0 02 22 22 2 st d st d h)(st st st st st d hh2 21 11 12 28 84 42 22 2 st dst st d K)h( 2 21 11 1st d hK2 21 11 1 ddddstddst = FK PKK2 22 21 11 1 st d hKh22vhg std211hK2 st11vg 2202vvgh 2d st11vKg 20 st211vghg 0vdddPVTvVFg2110 22 Pv

4、P g2 d d st1122dVVT FP dd st dststvg2 dstvFPg2 dststvg2 dstvKg2dst211hK dstvKg2APBHlAPBHl21(0.0625 1015)9.38mm NF lEA329215 1040.239mm200 100.04 /4 stmm129.62 HKd st211 NstFPAd24 ddststHPKd224(11) Hmm389APBHlAPBHlNstF lEA39215 1040.239mm200 100.04 /4 HKd st211 NstFPAd24 ddststHPKd224(11) Hmm9.67 BR lEI313 QlQllEIEI322(0.6 )(0.6 )(0.4 )32 120 BRQ0.432MQlQlmax0.4320.40.173stMQlWWmaxmax0.173 BstQRQlEI30.00979 dstvKg2ddstEIv QKglW2maxmax23.05hIEaP3 34 43 3 st 3 32 23