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考虑残余应力对压痕弯曲梁应力场强度的贡献后,对相应的KIC表达式进行了修正。研究表明:在合适的压痕压制荷载范围内,弯曲梁强度σr与压痕裂纹深度的倒数平方根(1/a)1/2之间存在线性关系;压痕处的残余应力效应可以用σ?-(1/a)1/2直线关系式中的强度修正项加以描述。高温下强度修正项的值随温度的升高而减小,说明残余应力在高温作用下得到了部分消除;退火处理也导致了强度修正项的减小。采用强度修正项后的KIC计算公式,压痕弯曲梁法可望应用于各种温度下的KIC测试;由σ?(1/a)1/2直线斜率求得的KIC值不受残余应力影响。
Abstract：An improved KIC formula for indented bending beam method is proposed by considering the contribution from residual stress to the total stress intensity at the indentation flaw. Ir'is shown that a quite linear relationship exists between the strength of bending beam,σf, and the inverse square root of the depth of indentation flaw,(1/a)1/2 for an appro-priate range of indentation load. The effect of residual stress about indentation canbe described properly with a strength revisionary term appeared in σ1/a1/2 fitting equation. The value of strength revisionary term decreases as temperature increases, inflecting that the residual stress is relieved partly at elevated temperatures.Annealing process also results in decrease in the value of revisionary term. Experiment confirms that indented bending beam method can be used for KIC measurement at both room and elevated temperatures. The residual stress does not influence K-(IC) value calculated from the slope of σ1/a1/2 fitting line.
[1] J.J.Petrovic, J.Amer. Ceram. Soc., 66(1983) 277．
[2] J.J.Petrovic, L.A.Jacobson, et al.,J.Amer. Ceram.Soc.,58(1975) 113．
[3] G.D.Quinn and J.B.Quinn, Fracfure Mechanics of Ceramics 6, Ed. by R.C.Bradt,et al., Plenum, New York (1983) 603．
[4] D.B.Marshall and B.R.Lawn,J.Mat.Sci.,14 (1979) 2001．
[5] D.B.Marshall ard B.R.Lawn, J.Amer.Ceram.Soc., 63 (1980) 532．
[6] M.G.Mendiratta and J.J.Petrovic, J.Amer.Ceram.Soc., 61 (1979) 226．
[7] K.Ikeda and H.Ikaki, J.Amer. Ceram. Soc., 70 (1987) C-29．
[8] Z.D.Guan and J.H.Gong, 3rd International Symposium on Ceramic Materials and Components for Engines, Ed.by V.J.Tennery, Amer. Ceram. Soc., Inc.(1989) 696．
[9] J.C.Newman, Jr., and I.S.Raju, Eng.Frac. Mech., 15(1981) 185．
[10] D.B.Marshall, J.Amer. Ceram. Soc., 66 (1983) 127．
[11] R.K.Govila, Ceramics for High-Performance Application Ⅲ, Ed.by E.M.Lenoe, et al., Plenum, New York (1983) 535．
[12] R.K.Govila,J.Mat. Sci.,19 (1984) 2111．
[13] R.K.Govila, J.Mat. Sci., 23(1988) 1141．
[14] T.Soma, Y.Ishida, et al., Ceramic Source'90, Amer. Ceram. Soc., Inc. (1990) 325．
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[1]龚江宏,关振铎.测定陶瓷材料断裂韧性的压痕弯曲梁法的改进[J].硅酸盐学报,1991(03):226-233.
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