Acoustic emission interpretation of ductile fracture processes

1979 ◽  
Vol 15 (6) ◽  
pp. 491-514 ◽  
Author(s):  
W. W. Gerberich ◽  
M. Stout ◽  
K. Jatavallabhula ◽  
D. Atteridge
Keyword(s):  
Acoustic Emission ◽  
Ductile Fracture ◽  
Fracture Processes

Effect of Concrete Mixture Composition on Acoustic Emission and Fracture Parameters Obtained from Three-Point Bending Test

2015 ◽  
Vol 1100 ◽  
pp. 152-155
Author(s):  
Libor Topolář ◽  
Hana Šimonová ◽  
Petr Misák
Keyword(s):  
Acoustic Emission ◽  
Bending Test ◽  
Mixture Composition ◽  
Three Point Bending ◽  
Concrete Mixtures ◽  
Fracture Parameters ◽  
Fracture Tests ◽  
Stress Behaviour ◽  
Bending Fracture ◽  
Fracture Processes

This paper reports the analysis of acoustic emission signals captured during three-point bending fracture tests of concrete specimens with different mixture composition. Acoustic emission is an experimental tool well suited for monitoring fracture processes in material. The typical acoustic emission patterns were identified in the acoustic emission records for three different concrete mixtures to further describe the under-the-stress behaviour and failure development. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour. The acoustic emission results are accompanied by fracture parameters determined via evaluation of load versus deflection diagrams recorded during three-point bending fracture tests.

An acoustic emission investigation of microscopic ductile fracture

1975 ◽  
Vol 6 (4) ◽  
pp. 797-801 ◽  
Author(s):  
William W. Gerberich ◽  
David G. Atteridge ◽  
Joseph F. Lessar
Keyword(s):  
Acoustic Emission ◽  
Ductile Fracture

Study on Acoustic Emission Signatures during the Process of Edge Chipping for Engineering Ceramics

2011 ◽  
Vol 697-698 ◽  
pp. 93-96 ◽  
Author(s):  
Xiu Jian Tang ◽  
Xin Li Tian ◽  
Jian Quan Wang ◽  
Ya Tao Mao ◽  
F.Q. Li
Keyword(s):  
Acoustic Emission ◽  
Fracture Process ◽  
Static Load ◽  
Average Frequency ◽  
Displacement Curve ◽  
Edge Chipping ◽  
Kaiser Effect ◽  
Engineering Ceramics ◽  
Highly Active ◽  
Fracture Processes

The developments of edge chipping for engineering ceramics are analyzed. An edge chipping experiment under static load is adopted to study the fracture process of edge chipping. The results show that the fracture processes of edge chipping under different edge distances are similar, which can be divided into four stages based on load-displacement curve. There is obviously Kaiser Effect during the fracture processes of edge chipping. Counts, average frequency, RMS, duration, amplitude and inverse calculation can be used to describe the process of edge chipping for engineering ceramics. Amplitude, duration and average frequency become highly active on the eve of fracture, which can be regard as the omens of edge chipping and used to predict the fracture of edge chipping.

Ductile fracture processes in 7075 aluminum

1995 ◽  
Vol 26 (2) ◽  
pp. 407-415 ◽  
Author(s):  
C. P. You ◽  
A. W. Thompson ◽  
I. M. Bernstein
Keyword(s):  
Ductile Fracture ◽  
Fracture Processes

Application of Constraint-Sensitive Fracture Mechanics to the Assessment of Girth Weld Integrity

2004 ◽  
Author(s):  
Yong-Yi Wang ◽  
Ming Liu ◽  
David Horsley
Keyword(s):  
Fracture Mechanics ◽  
Ductile Fracture ◽  
Experimental Evidence ◽  
Practical Application ◽  
Constraint Effect ◽  
Potential Applications ◽  
Constraint Effects ◽  
Assessment Procedures ◽  
Cracked Specimens ◽  
Fracture Processes

It has been known since the 1960’s that the crack-tip fields of specimens containing sharp cracks depend on the mode of loading. Experimental evidence has shown that cracked specimens loaded in bending have lower toughness than the same material loaded in tension. This phenomenon has been attributed to the “constraint effect” on fracture. Modern constraint-sensitive fracture mechanics has brought about fundamental theoretical understandings on the constraint effects. The constraint-sensitive fracture mechanics has moved from academic circles to practical application, as evident by a number of recently published fitness-for-service (FFS) assessment procedures that incorporates the constraint effects. This paper reviews the developments in constraint-sensitive fracture mechanics with the focus on its potential applications to the assessment of pipeline girth weld integrity. The review covers (1) constraint theories and experimental evidences, (2) constraint models for brittle and ductile fracture, and (3) limitations of current constraint models. The paper closes with thoughts on the applications of the constraint models and theories to ductile fracture processes, which are the most relevant to modern linepipes and their welds.

Interaction Effect Evaluation of Multiple Through Cracks in Ductile Fracture Process

2012 ◽  
Author(s):  
Kazuhiro Suga ◽  
Katsumasa Miyazaki ◽  
Yohei Arai ◽  
Masanori Kikuchi
Keyword(s):  
Ductile Fracture ◽  
Interaction Effect ◽  
Maximum Load ◽  
Initial Crack ◽  
Multiple Cracks ◽  
Horizontal Distance ◽  
Effect Evaluation ◽  
Ductile Crack Growth ◽  
Fracture Processes ◽  
Ductile Fracture Process

Study on the interaction effect of multiple cracks on the collapse load during ductile crack growth processes is important for the integrity evaluation of nuclear structure. The ductile fracture processes are well studied numerically by using Gurson’s constitutive equation and taking into account of void growth during plastic deformation. In this study, two through cracks are assumed to exist in a flat plate in tension and the interaction between two cracks is studied. The initial crack length, horizontal distance and vertical distance between two cracks are changed systematically. The interaction behavior between two cracks is studied precisely. Criteria to evaluate maximum load in the ductile fracture processes are discussed. The present study found H/l criteria can estimate the maximum load reasonably, and also the consideration of the effect of the horizontal distance between two cracks in H/l criteria may improve its estimation more reasonable. The effects on maximum load by changing the horizontal distance between two cracks are studied.

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