Initiation of ductile fracture in mixed-mode I and II aluminum alloy specimens

被引：20

作者：

Qian, Xudong ^{[1
]}

Yang, Wuchao ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117576, Singapore

来源：

ENGINEERING FRACTURE MECHANICS | 2012年 / 93卷

关键词：

Fracture initiation; Mixed mode; Ductile fracture; Strain detection; Energy release rate; TOUGHNESS; BEHAVIOR; STEEL;

D O I：

10.1016/j.engfracmech.2012.06.018

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This study investigates the initiation of mixed-mode crack extensions in four-point bend and shear specimens fabricated from aluminum alloys. The determination of fracture initiation utilizes a new strain detection method, which provides a uniform criterion for specimens over the complete mixed-mode I-II loading range. The 0.2 mm offset method for mode I specimens and the physical features on the fracture surface of mode II dominant specimens validate this method. The total measured fracture toughness shows a minimum value for the pure mode I case, a maximum for the pure mode II case and an oscillated trend over the mixed-mode I-II loads. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：189 / 203

页数：15

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