第四章-机械可靠性设计原理与可靠度计算课件.ppt

1、 SSSSn许用计算极限计算 nsssfS,21nsss,21ng,21n,21SSSSAFAAFFAF,RSPtR)()(nn RSPtRnsssfs,21ng,21ijS0ZS(0)RP Z g1 1数值积分法数值积分法2 2应力应力-强度干涉模型求可靠度强度干涉模型求可靠度()()(0)1R tPSPSPS 11dd,22SSSS11111dd()d22SSP SSSf SSA 211AdgsPs1121d()d()dSRA Af SSg ()1()()dd1()1()d()()dSFPSf SgSf SGSSGS f SS 11dd,2211111dd()d22PgA112()()dP

2、 Sf SSA1121d()d()dRA Agf SS()d()()ddR tRgf SS()1()()dd1()()d1()()dSSFP Sgf SSgFFg ()()(0)1NR tP NnP NnPn()()()ddnR tf nf NNn 3功能密度函数积分法求解可靠度功能密度函数积分法求解可靠度12(,)nZSf z zz0(0)()dRP Zf ZZ 4 4蒙特卡洛（蒙特卡洛（Monte CarloMonte Carlo）模拟法）模拟法211()exp()22SSSSf SS211()exp()22gSSyS22yS 211()exp()22yyyyh yy2011(0)expd

3、22yyyyRP yyyyyz220ySySz z+2222110expdexpd2222ySySzzRP yzz222211expdexpd()2222SRSZRzzRzz22ySRySZz ：2(180,22.5)N2(130,13)SN 22221801301.92422.513SRSZ()(1.924)0.9728RRZ 22221801302.6181413SRSZ()(2.618)0.995 6RRZ：2lnlnln11exp(00+)()220(0)xxxxf xxx，-ln xln x2lnlnln(,)SSSN2lnlnln(,)N lnlnlnySSyylnlnyS22ln

4、lnyS 1lnln00RPSPPSP ySlnln22lnln2lnln22lnln1expd()22SSSRSzRzZ2ln2lnlnlnSSZ2ln2lnlnlnSSRZ。lnln Slnln SSS2lnlnln22222lnln1ln1CClnln222lnln2ln1SSSSSSSClnln2222lnlnlnlnSSRSSZCClnln22lnln2lnln22lnln1expd()22SSSRSzRzZ22lnlnlnln2222lnln1lnln()2SSSRSSZCC 1111()()d()d()nnR nf nnf nnZ1n1n11lgnn 11NNnZNN111()(

5、,)()R nnR n nR n79.1201060100222ln2lnlnlnSSRZ96327.079.1RMpaZsSSR5.1ln2ln2lnlnln 111(,)0.6535(,)0.770 2()0.8485R n nR n nR n()e(0)SSSf SS()e(0)g 1()d()()ddSR tRf SgS00()()00()()()ddeeded(+)edSSSSSSSSSSSSSSSRPSf SgSSSSSRMpa3300Mpas2000623.0200033003300SR10010000()exp()SSmmSSSSSSSmf SSSSSS1000000()exp

6、()mmmg1000()exp()SSmmSSSSmSSSSf SSS1000()exp()mmmg0SSS0 dgFFs1 01000()1()()dexpexpdSSmmmSFP SFgSm令 0my11/00ddmmmyy，1/000()expdSmmSSSFP Syyy SSn2121222221SSsn22222222211SSSnnSSSSZ2221222211111ZZZnS2122SZn719.16.175.2609.323523521222122SZnMpaSMpa5.26,235MpaMpaSS6.17,137293.05.261376.172351371121222222122222SSSnNNFF100,1200225.0,0.6cmcmAANNSS136000,907200NN113400,544300MPaMPaMPaMPaSS18,182,15,240MPaMPaSs80,1000本章结束，谢 谢！