Plastic tearing occurs in compact tension (C(T)) specimens fabricated from ductile steels. This tearing, however, is not an elastic fracture problem governed by a crack tip singularity parameter. The current application of the J-integral and the J-R curve to plastic fracture mechanics…
Contents
1 INTRODUCTION
1.1 Problem
1.2 Background
1.2.1 Elastic Fracture Mechanics
1.2.2 J-integral and J-R Curve
1.2.3 Energy Separation
1.2.4 Other Approaches in Elastic-Plastic Fracture
1.3 Objective
2 J-INTEGRAL
2.1 Statement
2.2 J Is Not Working Theoretically
2.2.1 Deformation Theory of Plasticity
2.2.2 Small Strain Requirement
2.2.3 J as a Measure of Accumulated Work
2.2.4 Toughness Continues to Increase With Crack Growth
2.3 J Is Not Working Experimentally
2.3.1 List of ASTM J Terminologies
2.3.2 List of Test Configuration Restrictions
2.3.3 List of Data Qualifications for J
2.4 Summary
3 ENERGY RELEASE RATE IN TOUGH STEELS
3.1 Previous Energy Release Rate Methods
3.2 Compliance Ratio (CR) Method for Energy Release Rate
3.3 Comparison of Energy Release Rate Methods
3.3.1 Description of Experimental Data
3.3.2 Elastic and Plastic Energy Release Rates
3.4 Contribution
3.4.1 Effect of Steel Type on Energy Release Rate
3.4.2 Elastic Energy Release Rate and Stress Intensity Factor
3.4.3 Conclusions
4 PREVIOUS WORK ON GEOMETRIC FACTORS
4.1 CTOD and CTOD-R Curve
4.2 CTOA and CTOA-R Curve
5 MECHANISM OF PLASTIC TEARING
5.1 Plastic Tearing Mechanism Motion Analysis
5.1.1 General Theorem of Plastic Limit Load
5.1.2 Limit Load Solution for C(T) Specimens
5.1.3 Concept of Plastic Tearing Mechanism Motion
5.1.4 Mechanism Motion Resistance Curve
5.2 Crack Opening Angle / Normalized Displacement
5.2.1 Definition
5.2.2 COA-R Curve
5.3 Discussion
6 EFFECT OF TESTING CONFIGURATIONS
6.1 Description of Experimental Data
6.2 Effect of Initial Crack Length
6.3 Effect of Specimen Size
6.4 Effect of Testing Temperature
6.5 Effect of Steel Type
7 DISCUSSIONS AND CONCLUSIONS
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Author: Chen, Xiaohu
Source: University of Maryland
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