工程材料力学性能(束德林第三版)课后习题答案

11123456()7b8,,,9101121EG1002r0.20.2r0.20.2sbReHReLRp0.20.2Rr0.20.2Rt0.50.53Rm4n5ALu-L0L0A11.3L0=10d02A50mm50mmAgtZ344540Cr35CrMo5bccfccbccfcc6-7[][]8AZAZZAZZZA91011121331415fcc162J,E=2*105MPa,a=2.51010mms0Es1/2210521/2m4.0104Mpaa2.510100171(z=0,)2()2/(2E)Ue2a)W4as2a2E(UEW2a2E4as2a2E4asa012Es2ca183a03108cmm0.1E2105MPa1Es22ma0Esa0m12Es212a02cacam4c023101012210113.141.510371.4106Pa19E21011Ns8Nm7107N12Es2ca12210118271073.14aca0.2103m2ac=0.4mm20cRmRmc21d1/2:d-1/222;,23()()().a1/2a1/2max122--a----a1/2E1/22Scamaxm0E1/2Sc4aa11/22Es2EScac4aa05iyys1)a021/2E1/2E1/2s0.8sc1Ea1/2Ea1/2(s0.5sc2aa2)3a03a03a02425d1/2+kk=2Gq,1234561GkyGkyky2ikyiky3i,45q6q11maxmaxmaxmax13210.52323bnb4F6L5HR=K-H)/CHR6136dA78921Rmc:2bb:3eH:eL:4m:TmWm=Tm/W5bn:6NSR:7HBW8HRA20889HRB1.588mm2010010HRC207011HV13612HK13HS14HL3122453741)=0.82)3)4)412)1)2)3)5yyxx=0xyxryxyz67DmmFN2t(s)dmmAmm).(HBW)FAHBW0.102FA0.204FD(DD2d2)8hHR=k-h)/0.002k0.2mmk0.26mm136dAFD8.123456789101---HK-HV2----HRC3----HB4----HVHK5----HV6----HSHL()7----HV8----HRC9----HB10----HRA1:(1):mgH1-mgH2KJ(2)::UAKU.(3):(4)-Tt(5):(6):21K:,KV22mmV9KV88mmVKU22mmUKU88mmU2FATT50Tt50%3NDT:4FTE:Tt5FTP:Tt6CAT3W18Cr4VCr12MoV3Cr2W8V40CrNiMo30CrMnSi20CrMnTi40CrNiMo30CrMnSi20CrMnTi;W18Cr4VCr12MoV3Cr2W8V4.1235.6.tk(1)23Tk1TkTk2TkTk3TkTk7108112I34KIKI5a6789KKIICKICKI10GII11GGIIC,12JJGGJJG13JJIIC,14COD2aCOD15CODC,162.1KIC:KICCKCKCKIC2G1C:GGGGcK11SS3J1C4C34r5KIKIaKIKIKY6KKK7y2KIC/s)8KIKIKIKIKIYaYaKI()KI()10.16Y2/210..056Y2/29GriffithG1Ga12f10JJdyuTdsx11CODCOD8salnsec()E2s12K1CFvF-vFQ;OOA5%2%F5F5F-vF5F5FQ=F5FQaFQaKPQSYaQ3/21BWw2KQKQFmax/FQ1.10B2.5(KQ/y)1.513K1CKIC=KQKICE*X1/214.K1CKV2KICKV2VKICKV215.K1CKICKICKICKICKICKICKICKICKICKICKICKICKICyc13ICKICKIC16.0.2=1200MPaK1C.=115MPa.m1/220mm900MPaKR00.2=1200MPaK1C.=115MPa.m1/22a=20mm900MPa/0.2900/12000.75Y=KYa9000.011/2K1167.92MPa.m10.056Y2(/0.2)210.0560.752K12167.922R00.0562s0.056212000.0022m2.2mmKK1C17K=50MPa.m1/2,r0.21000MPa:1)250MPa,2)3)2.5cm,4)10cm1143.8a0.212K/0.221c3.8a0.212KIC/0.2218150MPa25mma/c1,0.2=720MPa,Kc/0.2150/7200.210.7KIKICYY1.1KICY1.11.1150=46.23MPa.m1/219a=1mm1000MPa0.2Kc0.2Kc0.211001200130014001500K1C.11095756055a=1mm1000MPa/0.21000/11000.91a/c0.6,1.28,Y=K1.1aK1c20.212(/0.2)2c1K1c1.281101828MPac1,c2,c3,c4,c5/0.21000/12000.83a/c0.6,1.28,Y=K1.1aK1c20.212(/0.2)2c2K1c1.28951689MPac2,/0.21000/13000.77a/c0.6,aa3.140.0251.13.80.0010.212110/110021.13.80.0010.21295/12002153.8a0.212K/0.221c3.8a0.212K/0.221c1.1a1.28,Y=K1.1aK1c20.212(/0.2)2c3K1c1.28751433MPac3,/0.21000/14000.714a/c0.6,1.28,Y=K1.1aK1c20.212(/0.2)2c4K1c1.28601180MPac4,/0.21000/15000.67a/c0.6,1.28,Y=ck1c1.28551135MPac51.10.001c5,1.;(1)=max-min(2)=e+p3a:a=(max-min)/24t2e2p25m=(max+min)/26r:r=min/max71.13.80.0010.21275/130021.13.80.0010.21260/140021.116thth8910(-1)1112KY1/213da/dN1415-16171912mm21-1-1p-1-1N:-1:-1p:-1:-1N:2qf34KthK3123()4412317macK1KIC5S-NS-N6(1)amamrmaxramABCamtanam1()2maxmin1r1()1r2maxminrtanOABCBrrBrBaBmB(2)max(min)mmaxminmrmax(min)tanmaxm2max2maxmin1rr,tanOOHAHCH7()(-1)18()()81rmrda/dN2kda/dN3Kthda/dN9(Laird)a0b45cd45e1910KIac11-1Kth1kth-1-1kth12121231312b/0.21.4b/0.21.23n0.1n0.114-123NN420p5tepf2Nb2Nc222Effffbcf--p2f2Nc15--f22Nc1612341745b=610MPa,-1=300MPaGoodmanmax(min)-m-0.500.5ff211C18max=200MPa,min=0,b=670MPa0.2=600MPaK=104MPa.m1/2,Parisc=6.910-12n=300.1mm1mm11234-5+2.(1)scc2K1scc3K1HEC,4da/dt:3122(2)(3)-4da/dtK1()da/dtKIda/dt=f(KI),lg(da/dt~KIIKIK1sccda/dtIIda/dtKIIIIda/dtKIKIKIKICIIIIda/dtIIKIIda/dNKda/dNKda/dNIIda/dNIKIIIda/dNK236+-Fe7123458M2440B1200MPa650MPa112345H1/3624782.312341/35123Fe2O32567145zy45max0.1-0.2mmV20.2-0.4mmzy45max0.786b0.5b381123456726/821t2t3t4sh345Cr-NiMPahMPah5404805506207001670435112236503453754109564256003454104805155503210268112452473012013517019523517002953481234461650170205240275310438951201122487621988107088105120135170153435073135872226828(1)(2)8102000h(3)60020000h2767