Development of Toughness Scale Diagram Considering Temperature Dependency


Article Preview

Fracture toughness data from the cleavage resistance test of structural steels often show a large scatter. Geometry dependency as well as the scatter makes it difficult to evaluate appropriate fracture integrity of cracked components. To address these restrictions, several stochastic models have been proposed by Beremin group, Mudry and other researchers while each of them employs specific estimation scheme and micro-mechanical parameters. The purpose of this paper is to investigate applicability of the Weibull stress model in transition temperature regime and to quantify constraint effect among different-sized CT and PCVN specimens. The constituting parameters m and σu are determined at three temperatures by maximum likelihood estimate (MLE) technique in use of FE analysis results and experimental data of PCVN specimens. Also, failure probabilities of PCVN and CT specimens are calculated from the Weibull parameters, which are used for derivation of a prototype of toughness scale diagram. The diagram provides a technical basis to resolve transferability issue in the same material under different temperatures and constraint conditions.



Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim




H. O. Ko et al., "Development of Toughness Scale Diagram Considering Temperature Dependency", Key Engineering Materials, Vols. 345-346, pp. 513-516, 2007

Online since:

August 2007




[1] J.D. Landes: ASTM STP 1244(1995), pp.461-478.

[2] J. Heerens, D. Hellmann and R.A. Ainsworth: ESIS Publication 30(2002), pp.297-305.

[3] F.M. Beremin: Metallurgical Transactions, Vol. 14A(1983), pp.2277-2287.

[4] F. Mudry: Nuclear Engineering and Design, Vol. 105(1987), pp.65-76.

[5] Y.S. Chang, T.R. Lee, J.B. Choi, Y.J. Kim and B.S. Lee: Key Engineering Materials, Vols. 326-328(2006), pp.931-934.

[6] Y.S. Chang, T.R. Lee, J.B. Choi, Y.J. Kim and B.S. Lee: Solid State Phenomena, Vol. 110(2006), pp.193-200.

[7] X. Gao, R.H. Dodds Jr., R.L. Tregoning, J.A. Joyce and R.E. Link: Fatigue and Fracture Engineering Materials and Structures, Vol. 22(1999), pp.481-493.

[8] L.C. A Folch and F.M. Burdekin: Engineering Fracture Mechanics, Vol. 63(1999), pp.57-80.

[9] ABAQUS Inc.: User's Manual(2005), ABAQUS Version 6. 5-1.

[10] F. Minami, A. Brückner-foit, D. Munz and B. Trolldenier: International Journal of Fracture, Vol. 54(1992), pp.197-210.