The J-Integral for a Single-Edge Cracked Panel Subjected to Combined Remote Tension and Bending

2009 ◽  
Author(s):  
Masaaki Matsubara
Keyword(s):  
Crack Initiation ◽  
Ductile Fracture ◽  
Strain Hardening ◽  
Structural Integrity ◽  
Crack Size ◽  
Strain Hardening Exponent ◽  
J Integral ◽  
Single Edge ◽  
Energy Concept

On structural integrity evaluation, a single-edge cracked panel subjected to combined remote tension and bending is the typical one. The J-integral is a valid way for handling the ductile fracture problem immediately after stable crack initiation. The complimentary energy concept combined with fully plastic solutions to make it to estimate the J-integral of the panel. The proposed method is able to give us the J-integral as a function of the crack size/panel width and the strain hardening exponent.

scholarly journals Evaluation of ductile crack initiation limit using strain hardening exponent

2016 ◽  
Vol 82 (842) ◽  
pp. 16-00096-16-00096
Author(s):  
Takehisa YAMADA ◽  
Yoichi YAMASHITA ◽  
Sohei KANNA
Keyword(s):  
Crack Initiation ◽  
Strain Hardening ◽  
Strain Hardening Exponent ◽  
Ductile Crack

Influence of Weld Mismatch on the Structural Integrity of Pipes for Reeling

2008 ◽  
Author(s):  
Gustavo M. Castelluccio ◽  
Sebastian Cravero ◽  
Hugo A. Ernst
Keyword(s):  
Fracture Toughness ◽  
Structural Integrity ◽  
J Integral ◽  
Finite Element Analyses ◽  
Single Edge ◽  
Inhomogeneous Materials ◽  
Elastic Plastic ◽  
Edge Notch ◽  
Integrity Analysis ◽  
Crack Position

Structural integrity analysis of tough materials based on Elastic-Plastic Fracture Mechanics (EPFM) has been successfully employed in the assessment of components. EPFM has originally been developed for homogeneous materials and its applicability to inhomogeneous materials has some peculiarities. In particular, Fitness for Service design of welded pipes requires to know the weld fracture toughness and to estimate accurately the J-integral applied on the actual structural member. In this work, finite element analyses of simulated welds have been carried out in order to qualify and quantify the lack of accuracy of experimental methodologies for measuring fracture toughness of welds and the influence of welds on the applied J-integral in a pipe under bending. Different weld widths and cracks positions are characterized for single edge notch specimens in tension (SE(T)) and pipes. It has been found that inhomogeneity affects elastic-plastic fracture parameters for cracks centered in welds of certain widths. Moreover, the applied J-integral on pipes with circumferential cracks depends significantly on the weld width and crack position.

J-Integral Estimates for Strain-Hardening Materials in Ductile Fracture Problems

AIAA Journal ◽  
1977 ◽  
Vol 15 (7) ◽  
pp. 923-931 ◽  
Author(s):  
Satya N. Atluri ◽  
Michihiko Nakagaki
Keyword(s):  
Ductile Fracture ◽  
Strain Hardening ◽  
J Integral

J-Integral and Crack Opening Displacement as Crack Initiation Criteria in Natural Rubber in Pure Shear and Tensile Specimens

1987 ◽  
Vol 60 (4) ◽  
pp. 674-688 ◽  
Author(s):  
R. F. Lee ◽  
J. A. Donovan
Keyword(s):  
Crack Initiation ◽  
Carbon Black ◽  
Pure Shear ◽  
Crack Opening ◽  
Crack Size ◽  
J Integral ◽  
Carbon Black Content ◽  
Opening Displacement ◽  
Critical Crack ◽  
Tip Radius

Abstract For PS and SEN specimens: 1) Jδ (one half Jθ) can be determined from one specimen and is independent of crack size and specimen geometry. 2) J and T at initiation differed. 3) J at initiation increased with carbon black content, but the critical crack-tip radius did not.

Transformation of BS7448-CTOD to ASTM E1290-CTOD

2008 ◽  
Author(s):  
Yoichi Kayamori ◽  
Takehiro Inoue ◽  
Tetsuya Tagawa
Keyword(s):  
Strain Hardening ◽  
Strain Hardening Exponent ◽  
Test Results ◽  
Single Edge ◽  
Crack Tip Opening Displacement ◽  
Opening Displacement ◽  
Edge Notch ◽  
Crack Tip Opening ◽  
The Relationship ◽  
Single Edge Notch Bend

Experimental and analytical investigations into Crack Tip Opening Displacement, CTOD, were conducted to demonstrate the relationship between BS7448-CTOD and ASTM E1290-CTOD. CTOD test results showed that ASTM-CTOD was occasionally much lower than BS-CTOD both in single edge notch bend specimens and in CT specimens for low-strength structural steels, and this tends to be more remarkable in CT specimens. In addition, the analytical results of simplified elastic-plastic facture parameter calculation using the Electric Power Research Institute scheme demonstrated that the ratio of ASTM-CTOD to BS-CTOD was not constant but varied according to CTOD changes. Material factors such as the yield stress, the strain hardening exponent, specimen size and configurations influenced the CTOD ratio, and low strain hardening exponent in the Ramberg-Osgood relation and CT specimen configuration significantly decreased the CTOD ratio. An equation that transforms BS-CTOD into ASTM-CTOD is proposed in this study. This equation gives a good estimate of ASTM-CTOD from BS-CTOD.

Ductile Fracture of Ferritic Steels: Correlation of KIIc/KIc Ratio and Strain Hardening Curve

2002 ◽  
Author(s):  
Jiri Novak
Keyword(s):  
Ductile Fracture ◽  
Strain Hardening ◽  
Mixed Mode ◽  
Fracture Strain ◽  
Shear Fracture ◽  
Instability Criterion ◽  
Strain Hardening Exponent ◽  
Mixed Mode Loading ◽  
Cavitation Instability ◽  
Using Data

Recently, interest on fracture toughness under mixed mode loading increases and many questions remain to be answered, especially for ductile fracture. Crack growth resistance curves for mixed mode loading may be interpreted as a result of competition between usual ductile fracture and shear fracture. Analysis is based on previous work in the field of ductile fracture, especially on studies of ductile fracture criteria of the type “loss of stability of homogeneous deformation field”. Phenomena of shear fracture can be successfully predicted by bifurcation analysis of shear band initiation or localized necking. Usual ductile fracture under different stress triaxialities can be analogously predicted by cavitation instability criterion. Usual (cavitation-type) ductile fracture strain depends on strain hardening exponent less than shear fracture strain does and this explains dependence of the KIIc/KIc ratio on strain hardening exponent. These ideas are demonstrated quantitatively using data in the open literature.

Ramberg-Osgood Parameters for 63–37 Sn-Pb Solder

1992 ◽  
Vol 114 (2) ◽  
pp. 234-238 ◽  
Author(s):  
A. J. Rafanelli
Keyword(s):  
Strain Hardening ◽  
Power Law ◽  
True Strain ◽  
Material Constant ◽  
Strain Hardening Exponent ◽  
J Integral ◽  
Engineering Strain ◽  
Fracture Properties ◽  
Preliminary Step ◽  
Stress Levels

As part of a fracture properties study, the Ramberg-Osgood parameters were evaluated for 63-37 Sn-Pb (tin-lead) solder. This work was a preliminary step in experimentally determining J-integral values via the Hutchinson-Rice-Rosengren (HRR) power law for hardening materials. Consideration was given to both engineering strain and true strain when plotting the curves. Results disclosed little effect of either engineering or true strain at linear stress levels. For a strain-hardening exponent of 1.0, a material constant of 0.9849 was determined.

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