A coupled FFM model to interpret fracture toughness values for brittle materials

被引：0
|
作者：
Firrao, Donato [1 ]
Matteis, Paolo [1 ]
Sapora, Alberto [2 ]
Cornetti, Pietro [2 ]
Carpinteri, Alberto [2 ]
机构：
[1] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy
[2] Politecn Torino, Dept Struct Geotech & Bldg Engn, Corso Duca Abruzzi 24, I-10129 Turin, Italy
来源：
21ST EUROPEAN CONFERENCE ON FRACTURE, (ECF21) | 2016年 / 2卷
关键词：
HTA steel; CTA steel; notch radius; austenitic grain size; Finite Fracture Mechanics; NOTCH; STRESS;
D O I：
10.1016/j.prostr.2016.06.249
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Around 1970 quenching AISI 4340 steel from 1200 degrees C was discovered to lead to much higher fracture toughness, in the as quenched state, than by conventional austenitizing at 870 degrees C. Further researches have ascertained that the apparent toughness increase is limited to fracture toughness tests, whereas Charpy-V impact tests do not show any betterment due to high temperature austenitizing, in respect to conventional heat-treating. Various explanations of these contradicting results were given on the basis of the then existing theories. The puzzling phenomenon is here interpreted by means of Finite Fracture Mechanics theories, based on the contemporaneous fulfilment of a stress requirement and the energy balance. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
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页码：1983 / 1990
页数：8
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