scholarly journals Fracture Mechanics. Fracture Behavior of Plate Glasses by Projectile Impact.

1998 ◽  
Vol 47 (8) ◽  
pp. 830-835 ◽  
Author(s):  
Akihiko MIYAMOTO ◽  
Yukitaka MURAKAMI
Keyword(s):  
Fracture Mechanics ◽  
Fracture Behavior ◽  
Projectile Impact

Fracture Toughness Testing and its Implications to Engineering Fracture Mechanics Analysis of Energy Pipelines

2018 ◽  
Author(s):  
Sergio Limon ◽  
Peter Martin ◽  
Mike Barnum ◽  
Robert Pilarczyk
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Test Data ◽  
Fracture Mode ◽  
Fracture Process ◽  
Fracture Behavior ◽  
Fracture Initiation ◽  
Fracture Toughness Testing ◽  
Final Fracture ◽  
Toughness Testing

The fracture process of energy pipelines can be described in terms of fracture initiation, stable fracture propagation and final fracture or fracture arrest. Each of these stages, and the final fracture mode (leak or rupture), are directly impacted by the tendency towards brittle or ductile behavior that line pipe steels have the capacity to exhibit. Vintage and modern low carbon steels, such as those used to manufacture energy pipelines, exhibit a temperature-dependent transition from ductile-to-brittle behavior that affects the fracture behavior. There are numerous definitions of fracture toughness in common usage, depending on the stage of the fracture process and the behavior or fracture mode being evaluated. The most commonly used definitions in engineering fracture analysis of pipelines with cracks or long-seam weld defects are related to fracture initiation, stable propagation or final fracture. When choosing fracture toughness test data for use in engineering Fracture Mechanics-based assessments of energy pipelines, it is important to identify the stage of the fracture process and the expected fracture behavior in order to appropriately select test data that represent equivalent conditions. A mismatch between the physical fracture event being modeled and the chosen experimental fracture toughness data can result in unreliable predictions or overly conservative results. This paper presents a description of the physical fracture process, behavior and failure modes that pipelines commonly exhibit as they relate to fracture toughness testing, and their implications when evaluating cracks and cracks-like features in pipelines. Because pipeline operators, and practitioners of engineering Fracture Mechanics analyses, are often faced with the challenge of only having Charpy fracture toughness available, this paper also presents a review of the various correlations of Charpy toughness data to fracture toughness data expressed in terms of KIC or JIC. Considerations with the selection of an appropriate correlation for determining the failure pressure of pipelines in the presence of cracks and long-seam weld anomalies will be discussed.

A Study on the Fracture Mechanics of Support Structure of Excavation Puddle by LPG Explosion Using AUTODYN

2018 ◽  
Vol 783 ◽  
pp. 23-27
Author(s):  
Chang Keun Chae ◽  
Eui Soo Kim
Keyword(s):  
Numerical Analysis ◽  
Fracture Mechanics ◽  
Internal Stress ◽  
Structural Stability ◽  
Fracture Behavior ◽  
Interaction Analysis ◽  
Support Structure ◽  
Cutting Machine ◽  
Commercial Program ◽  
Fluid Interaction

Cutting iron bars using a gas cutting machine is indispensable inside puddles of pier foundations. However, gas explosive accidents constantly occur as a result of the leakage of gas. It is necessary to perform specialized and systematic evaluations on structural stability, such as internal stress of the support structure, because the structural stability dominates the explosion and the collapse possibility of the structure. In this study, a structure-fluid interaction analysis was performed using an explosion commercial program, 2D/3D AUTODYN, to apply engineering numerical analysis technology to analyze the fracture behavior. The structural stability of the supporting structure in puddles was evaluated.

Analysis of the fracture behavior of a hydrided cladding tube at elevated temperatures by fracture mechanics

2002 ◽  
Vol 330-332 ◽  
pp. 400-403 ◽  
Author(s):  
Shinsuke Yamanaka ◽  
Masatoshi Kuroda ◽  
Daigo Setoyama ◽  
Masayoshi Uno ◽  
Kiyoko Takeda ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Fracture Behavior ◽  
Elevated Temperatures

Analysis of HAZ Fracture Toughness of Duplex Stainless Steel Weldment

2009 ◽  
Author(s):  
C. S. Pathak ◽  
L. G. Navale ◽  
A. D. Sahasrabudhe ◽  
M. J. Rathod
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Fracture Mechanics ◽  
Residual Stresses ◽  
Duplex Stainless Steel ◽  
Fracture Behavior ◽  
Health And Safety ◽  
Steel Weldment ◽  
Welded Structure ◽  
Stainless Steel Weldment

Most of the serious weldment failures lead to catastrophic consequences in terms of damage to other equipment, loss of production, and risks to workers’ health and safety. Hence there is motivation to find margin between safety and disaster. This necessitates guaranteeing the integrity of a welded structure even if a crack is present. Therefore influence of the material inhomogenity and residual stresses on deformation and fracture behavior needs to be described precisely. A comparison of the applied load with a convenient material parameter is necessary for this purpose. Fracture mechanics parameters J integral & CTOD have attracted great interest in recent years. In case of base materials, fracture mechanics works quite well, but some specific problems occur if fracture mechanics principles are applied when examining the toughness properties of welded joints. These problems are mainly caused by the large difference in material properties and residual stresses. Existing fracture toughness testing can predict fracture behavior, but does not sufficiently address the problem associated with weldment testing. Three SENB duplex stainless steel weldment specimens were tested as per ASTM E1820. This standard is not recommended for weldment, but since no standard is available for testing duplex stainless steel weldment, authors preferred to use it as reference. The aim of this work is to explore the possibility of using the test results in the reliable prediction of weldment fracture and its correlation with microstructure and hardness.

Mechanical Reliability of Z5u Multilayer Capacitors

1986 ◽  
Vol 72 ◽  
Author(s):  
Kelly D. Mchenry ◽  
Barry G. Koepke
Keyword(s):  
Fracture Mechanics ◽  
Fracture Behavior ◽  
Size Range ◽  
Post Mortem ◽  
Mechanical Reliability ◽  
Fatigue Data ◽  
Processing Defects ◽  
Multilayer Capacitors ◽  
Wide Size Range ◽  
Dynamic Fatigue

AbstractDynamic fatigue experiments were performed on Z5U multilayer capacitors in an attempt to correlate microflaw fracture behavior due to intrinsic processing defects within the material with predictions of fracture behavior based on macrocrack fracture mechanics determinations. A direct correlation between microflaw fracture behavior and predictions based upon macrocrack fracture mechanics techniques was not observable due to the wide size range of processing defects. A systematic post-mortem examination of fracture surfaces was used to identify fracture origins and sort individual test specimens into groups with equivalent flaw sizes. The correlation between microflaw and macrocrack fracture behavior became more “sorting” the dynamic fatigue data into groups withm oereq uoibvvailoeunst aflfatwer sizes.

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