The Role of Constraint and Warm Pre-Stress on Brittle Fracture in Ferritic Steels

A. Mirzaee-Sisan; Saeid Hadidi-Moud; Christopher E. Truman; David John Smith

doi:10.4028/www.scientific.net/KEM.261-263.177

Paper Titles

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Evaluation of Pipe Fracture Characteristics for SA312 TP304L Stainless Steel
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Fracture Analysis of Thick Plate for Partial Penetration Multi-Pass Weldment Using Ĵ-Integral
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The Brittle-Ductile Transition Character of Rocks and Its Effect on Rockbursts
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The Role of Constraint and Warm Pre-Stress on Brittle Fracture in Ferritic Steels
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Effect of Constraint on the Initiation of Ductile Fracture in Shear Loading
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Study on Damage History under the Different Stress Triaxiality in Constrained Ductile Media
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A Robust Method for Ramberg-Osgood Fit Relevant to Elastic-Plastic J Estimates
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Brittle Damage and Coalescence Model of Jointed Rock Mass
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The Role of Constraint and Warm Pre-Stress on Brittle Fracture in Ferritic Steels

Abstract:

This paper presents the results of an experimental and numerical study carried out to investigate the effect of warm pre-stressing on cleavage fracture in ferritic steels using cracked and notched specimens. It is shown that the local approach based on Weibull theory predicts the increase in toughness following warm pre-stressing in highly constrained geometries. The observed effect of pre-loading in low constraint specimens such as round notched bars is less. The local approach could not predict the differences and it is suggested that the variation of triaxiality factor, the ratio of hydrostatic stress to Von Mises, in the plastic zone, is a contributing factor.