THE SIZE EFFECT OF MICROSTRUCTURAL IMPLICATIONS OF THE WEAKEST LINK MODEL

被引：21

作者：

BRUCKNERFOIT, A

EHL, W

MUNZ, D

TROLLDENIER, B

机构：

[1] Karlsruhe Nuclear Research Centre, IMF, Karlsruhe, D-7500

[2] Institute for Reliability and Damage Analysis, University of Karlsruhe, Karlsruhe, D-7500

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1990年 / 13卷 / 03期

关键词：

D O I：

10.1111/j.1460-2695.1990.tb00592.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Abstract— CT specimens made of a reactor pressure vessel steel were loaded at—40°C until final failure occurred by cleavage fracture. The samples of Jlcl values obtained in these tests are analysed using the weakest link model. The size effect observed with specimens of different thicknesses is compared with the predictions of the weakest link model. A formula is derived for the distribution of the locations of fracture origins which have been determined for almost all specimens with a scanning electron microscope. The distribution of the size of the “weak spots” is calculated from the distribution of the fracture origins using two different models for the stress field ahead of the crack tip. These fractographic results and the Jlcl data confirm the basic ideas of the weakest link model. The deviations observed between the quantitative predictions of the weakest link model and the data can partly be explained by the change in the stress state ahead of the crack tip caused by a change in the specimen thickness. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：185 / 200

页数：16

共 22 条

[1]

Landes J.D., Shaffer D.H., Statistical characterization of fracture in the transition region, pp. 368-382, (1980)

[2]

Gumbel E., Statistics of Extremes, (1958)

[3]

Pineau A., Review of fracture micromechanisms and a local approach to crack resistance in low strength steels, Advances in Fracture Research, 1, pp. 179-186, (1981)

[4]

Wallin K., Saario T., Torronen K., Statistical model for carbide induced brittle fracture in steel, Metal. Sci., 18, pp. 13-16, (1984)

[5]

Slatcher S., A probabilistic model for lower‐shelf fracture toughness—theory and application, Fatigue & Fracture of Engineering Materials and Structures, 9, pp. 275-289, (1986)

[6]

Neville D.J., The non‐conservatism of the Weibull function when applied to the statistics of fracture toughness, Int. J. Fract., 34, pp. 309-315, (1987)

[7]

Hutchinson J.W., Plastic stress and strain field at a crack tip, J. Mech. Phys. Solids, 16, pp. 337-347, (1968)

[8]

Rice J.R., Rosegren G.F., Plane strain deformation near a crack tip in a power‐law hardening material, J. Mech. Phys. Solids, 16, pp. 1-12, (1968)

[9]

McMeeking R.M., Finite deformation analysis of crack‐tip opening in elastoplastic materials and implications for fracture, J. Mech. Phys. Solids, 25, pp. 357-381, (1977)

[10]

Curry D.A., Knott J.F., The relationship between fracture toughness and microstructure in cleavage fracture of mild steel, Metal Science, pp. 1-6, (1976)

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