Crack closure and stress intensity factor measurements in nodular graphite cast iron using three-dimensional correlation of laboratory X-ray microtomography images

被引：108

作者：

Limodin, Nathalie ^{[1
]}

Rethore, Julien ^{[2
]}

Buffiere, Jean-Yves ^{[1
]}

Gravouil, Anthony ^{[2
]}

Hild, Francois ^{[3
]}

Roux, Stephane ^{[3
]}

机构：

[1] Inst Natl Sci Appl, CNRS, UMR 5510, MATEIS, F-69621 Villeurbanne, France

[2] Inst Natl Sci Appl, CNRS, UMR 5529, LaMCos, F-69621 Villeurbanne, France

[3] Univ Paris Sud, CNRS, LMT Cachan, ENS Cachan,UPMC,PRES, F-94235 Cachan, France

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 14期

关键词：

X-ray microtomography; 3-D digital image correlation; Stress intensity factors; Nodular graphite cast iron; SHORT FATIGUE-CRACK; STRAIN-MEASUREMENTS; TOMOGRAPHY; GROWTH; BEHAVIOR; ALLOY; VISUALIZATION; NUCLEATION; DAMAGE; SHAPE;

D O I：

10.1016/j.actamat.2009.05.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three-dimensional (3-D) tomographic images of a nodular graphite cast iron obtained using a laboratory X-ray source were used to analyze the opening of a fatigue crack during in situ mechanical loading. Direct image analysis and digital image correlation are utilized to obtain the 3-D morphology and front location of the crack, as well as the displacement fields in the bulk of the specimen. From digital image correlation results it is possible to extract the crack opening displacement (COD) map in the whole sample cross-section and to compute stress intensity factors (SIFs) all along the crack front, even for COD values that are less than the image resolution. The comparison of COD maps with local values of the SIF enabled for an estimation of the opening SIF (K-op) equal to 6 MPa m(1/2). (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4090 / 4101

页数：12

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