北工大材料性能学实验指导

1 2 9 IC IC 12S34LσPσσp5A06mmLK AKKK。7A。A。K。/σb、K81234拉伸前d0A0拉断后LKΔLKdKAK整理后Eσpσeσsσbσs/σbδψSeKnSbeB9NAddKK、LKdK注：LKd光滑KKddNN中、ψN1234拉伸前d0A0dA光滑0dd拉断后LKLK边LK中dKd光滑Kdd整理后σsNσbNσsN/σbNδNδN边δN中KKKTKKKKaKKK冲击功AK备注2.掌握K进行KB≥2.5（Kσy/Eσy/E=9%，ψ=34%。Q +a+a）a2、a3和a4中的最大值与最小值之差不得超过 a/W当KQ满足B≥400K/Eσy Km=m0－m1(1)m0——磨前质量，mg；m1——磨后质量，mg。rrrR、R、R和RRN22rr'RRN（7—10）RXRN（7—11）、R2和RN的与R2R。RXRNR=R2从到111RR和R。RR=RLAA。AA△L=△LS-△LN-△LB±Kr(8—1)KrTemperature(Temperature(oC)5oC/min20oC/min5minFurnacecoolingrate0204060801009008007006005004003002000Ac3AmMMMMBmm(B)Hmmεeff(B)∝μM77mm1TcjjaBE+H2SO4H2SO4H2SO4KClH2SO4AAExtensometerremoval0.000.050.100.154000A A -1.6-1.4-1.2-1.0-0.8-0.62.752.702.652.602.552.50P-V0.956Pq=P5=7.863kN420.000.050.100.150.200.2580开6V开6V关±0.05℃,功耗约为2mW。I/T=3kLn8/(eR) I/T=1.000μA/K (2) (3)pNsNK3.K年X月X日，第X周星年X月X日，第X年X月X日，第X）StressStress(MPa)TrueExtensometerremoval400Strain0LinearFitK=950MPan=0.2685-1.8-1.6-1.4-1.2-1.0-0.82.802.752.702.652.602.552.5020502050BK0510152025Displacement(mm)σb=463MPaKTrueEngineering0.000.050.100.150.200.250.30400200BB0lgSlgSlgSlgS~lgeLinearFitK=938MPan=0.2892-1.5-1.4-1.3-1.2-1.1-1.0-0.9-0.8-0.72.752.702.652.602.552.50StressStress(MPa)400StrainTrues-1.6-1.5-1.6-1.5-1.4-1.3K=1119MPan=0.36062.602.552.502.45K,n值。BKPb=46.9kNs=35.2kNDisplacement(mm)40200BbN=597MPaKsN=448MPaDisplacement(mm)6005004003002000bN=597MPaKEngineeringstressofnotchσsN=448MPa0.050.100.150.200.250.306005004003002000.000/80mm）/80mm）/80mm）/80mm）/80mm）/80mm）sNbN20502050BK0510152025Displacement(mm)σb=463MPaKTrueEngineering0.000.050.100.150.200.250.30600500400300200BB0lgSlgS~lgeLinearFit-1.5-1.4-1.3-1.2-1.1-1.0-0.9-0.8-0.72.752.702.652.602.552.50ABRNPALoadLoad(kN)BKDisplacement(mm)StressStress(MPa)0.000.050.100.150.200.250.30Strain600400200σb=471MPaKTrueEngineeringBB0K=926MPan=0.2772ABRNPAB0510152025Displacement(mm)0.000.050.100.150.200.250.30600500400300200σb=447MPaKTrueEngineering0BBK=965MPan=0.3