75t吊钩超声波探伤及安全评价

75t(,435003)(,435004)ULTRASONICINSPECTIONOF75tCRANEHOOKSANDTHEIRSAFETYEVALUATIONLiuZixiangWuJinghuaHuXichi(HuangshiPolytechnicCollege)(EastIronandSteelCo.,Ltd.)75t,20,1993,19971,75t90t,,,A2A(),,,75t75tD=320mmh=320mmb=200mm11.1,Kp=(dB)B-(dB)F=20lgPD2FõZB2KZ2F(1)ZBZFDFK(dB)B(dB)F1.2P[1]P=2P0sin2bd0.94KZcosBcosA(2)2b2dBAZ1.2.1,,Z=2165mm,R5mm2mm25dB1.2.2a,2c,,45,,PP=2P0sin2bd0.94KZõcosBcosAPac2KZ(3)66322820008NDTVol.22No.8Aug.2000©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.P0a1.2.3,A2Aa,2c,()AL=8,PP=2P0sinPD2s0.948KZõcosBcosAPacKZ(4)Ds1.31.3.1Rc[2],,2.5MHz,20mm180mm,19dB2.5MHz,13mm13mmK1180mm,6dB2.5MHz,14mm,AL=8,480mm,7dB1.3.2,,2.5P202D,16dB,2dB,,,AL=8,14mm,4dB1.3.3A1=0.004dBömm,A2=0.025dBömm,A3=0.0078dBömm,A1=0.0078dBömm,A2=0.039dBömm,A3=0.031dBömm1.42mm2.5P202D,CS21100mm2mm50%,42dB;2.5P13mm13mmK12D,CSK2ËA100mm1mm6mm50%,72dB;AL=8,CSK2ËA100mm1mm6mm50%,64dB,1mm6mm2.08mm,,2.42mm,22.12.5P20,(dB)t(dB)t=(dB)c+(dB)r+(dB)d(dB)d=2AFxF-2AsxsAFAs(dB)c(dB)r(dB)d(dB)s,(dB)F,Kp=[(dB)s-2Asõxs]-[(dB)F-(dB)c-(dB)r-(dB)d]=40lgDFõxsDsõxF(5)DF,dsxF,xsCTS233,xFömm(dB)FödB(dB)ödBDFömm(200mm)9046163.58748163.19756162.27540164.2(300mm)3171061)262.03201062)261.8(180mm)13562202.75546192.65064190.813758203.4277106200280106200:1)25%2)20%2.2,75t2mm,,763:75t©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.A2A(),2mm,24,2c=4.0a,PD2F4=12P2a2DFDF=2mmaa=1.0mm23,3a=3.0mm5mm100%,5mm,Ê,,,75t90t,A2ARmax=194.9Nömm2,20Rs=245MNöm2,Cv=39J,[3]KICKICRs2=0.64CvRs-0.01KIC=75.7(MNõm-3ö2)ac(KICöRs)2QöP(Q),,acac=PEDc8RslnsecPR2RsE=E1-M2MDcKIC=2ERsDc[4]Dc=0.0550.061mm,Dc=0.055mmRmax,KIC,ac=17.29mmParis,dadN=A($K)mA,maN$K+[5]A=0.6910-10m=3.5$K=Yõ$R=1.1PQõ$RQ=2-0.212RRs2$R=194.9Nömm22=P22õ13162a0=5mmNN=2A(Yõ$R)m(m-2)1a0m-22-1acm-22=1.9104a030,633d,2a,,199716,3(1)75t,DF=25mm,2mm(2)12.5Lm,,(3),3mm100%,5mm(4),,1.,1993,15(12):3382..:,1985.1383..:,1989.3084..:,1982.1185.,1986(2):35:1999202214863:75t©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.