Author: DB. Barker
Publisher:
ISBN:
Category : Compact crack arrest (CCA) specimen
Languages : en
Pages : 17
Book Description
A split-birefringent coating technique, coupled with high-speed photography, was used to record the dynamic isochromatic fringe pattern associated with crack propagation and arrest in 4340 steel compact crack arrest fracture specimens. From the data contained in the isochromatic fringe patterns, the associated dynamic stress-intensity factor was calculated in two different ways. First, the dynamic stress-intensity factor was calculated from the isochromatic fringe information directly. Next, the isochromatic fringe patterns were used to obtain a crack position history which was used for input to a two-dimensional dynamic finite-element code used in the "generation mode." These two dynamic stress-intensity factors were compared with each other and with the crack arrest toughness as calculated by the proposed ASTM method for estimating crack arrest toughness.
Determination of Dynamic Fracture Behavior in 4340 Steel Compact Crack Arrest Specimens Using Birefringent Coatings and Finite-Element Analysis
Author: DB. Barker
Publisher:
ISBN:
Category : Compact crack arrest (CCA) specimen
Languages : en
Pages : 17
Book Description
A split-birefringent coating technique, coupled with high-speed photography, was used to record the dynamic isochromatic fringe pattern associated with crack propagation and arrest in 4340 steel compact crack arrest fracture specimens. From the data contained in the isochromatic fringe patterns, the associated dynamic stress-intensity factor was calculated in two different ways. First, the dynamic stress-intensity factor was calculated from the isochromatic fringe information directly. Next, the isochromatic fringe patterns were used to obtain a crack position history which was used for input to a two-dimensional dynamic finite-element code used in the "generation mode." These two dynamic stress-intensity factors were compared with each other and with the crack arrest toughness as calculated by the proposed ASTM method for estimating crack arrest toughness.
Publisher:
ISBN:
Category : Compact crack arrest (CCA) specimen
Languages : en
Pages : 17
Book Description
A split-birefringent coating technique, coupled with high-speed photography, was used to record the dynamic isochromatic fringe pattern associated with crack propagation and arrest in 4340 steel compact crack arrest fracture specimens. From the data contained in the isochromatic fringe patterns, the associated dynamic stress-intensity factor was calculated in two different ways. First, the dynamic stress-intensity factor was calculated from the isochromatic fringe information directly. Next, the isochromatic fringe patterns were used to obtain a crack position history which was used for input to a two-dimensional dynamic finite-element code used in the "generation mode." These two dynamic stress-intensity factors were compared with each other and with the crack arrest toughness as calculated by the proposed ASTM method for estimating crack arrest toughness.
Fracture Mechanics, Nineteenth Symposium
Author: Thomas A. Cruse
Publisher: ASTM International
ISBN: 0803109725
Category : Fracture mechanics
Languages : en
Pages : 936
Book Description
Publisher: ASTM International
ISBN: 0803109725
Category : Fracture mechanics
Languages : en
Pages : 936
Book Description
Fracture Mechanics
Photoelastic Studies of Crack Propagation and Crack Arrest in Polymers and 4340 Steel
Author: George Rankin Irwin
Publisher:
ISBN:
Category : Fractography
Languages : en
Pages : 332
Book Description
Publisher:
ISBN:
Category : Fractography
Languages : en
Pages : 332
Book Description
Some Aspects of Performing Dynamic Measurements and Analyses on the Compact Crack Arrest Specimen for A533-B Steel
Author: B. Brickstad
Publisher:
ISBN:
Category : Compact crack arrest specimen
Languages : en
Pages : 15
Book Description
The four countries of Sweden, Norway, Finland, and Denmark are participating in a joint project which includes performing instrumented crack arrest experiments on A533-B steel. The primary aim of this study is to determine the dynamic fracture properties during propagation and arrest. Dynamic finite-element methods calculations were used to analyze earlier reported experiments on the transverse wedge-loaded compact crack arrest (CCA) specimen, in order to obtain guidance for future experiments regarding measuring technique, material characterization, and the crack-tip model. The computations indicate that the dynamic effects on the stress-intensity factor are small for the CCA specimen. It is also shown that proper determination of the displacement controlled boundary conditions can be made by measuring displacements at the load line. Computations were also made with the material treated as elastic-viscoplastic. It was found that nonlinear material behavior is likely to be important for A533-B steel at least at room temperature and higher temperatures.
Publisher:
ISBN:
Category : Compact crack arrest specimen
Languages : en
Pages : 15
Book Description
The four countries of Sweden, Norway, Finland, and Denmark are participating in a joint project which includes performing instrumented crack arrest experiments on A533-B steel. The primary aim of this study is to determine the dynamic fracture properties during propagation and arrest. Dynamic finite-element methods calculations were used to analyze earlier reported experiments on the transverse wedge-loaded compact crack arrest (CCA) specimen, in order to obtain guidance for future experiments regarding measuring technique, material characterization, and the crack-tip model. The computations indicate that the dynamic effects on the stress-intensity factor are small for the CCA specimen. It is also shown that proper determination of the displacement controlled boundary conditions can be made by measuring displacements at the load line. Computations were also made with the material treated as elastic-viscoplastic. It was found that nonlinear material behavior is likely to be important for A533-B steel at least at room temperature and higher temperatures.
Metals Abstracts
Crack Arrest Methodology and Applications
Dynamic Photoelastic Determination of the ?a-K Relation for 4340 Alloy Steel
Author: JW. Dally
Publisher:
ISBN:
Category : Birefringent coating
Languages : en
Pages : 22
Book Description
A method of direct determination of the instantaneous stress-intensity factor associated with running and arrested cracks in steels has been developed at the University of Maryland. Birefringent coatings have been applied to the proposed ASTM standard crack arrest compact specimens of oil-quenched and tempered 4340 steel. Isochromatic fringe patterns during crack propagation and crack arrest have been photographed successfully with an ultrahigh-speed Cordin camera and specially designed high-intensity and short-duration Xenon lamp system.
Publisher:
ISBN:
Category : Birefringent coating
Languages : en
Pages : 22
Book Description
A method of direct determination of the instantaneous stress-intensity factor associated with running and arrested cracks in steels has been developed at the University of Maryland. Birefringent coatings have been applied to the proposed ASTM standard crack arrest compact specimens of oil-quenched and tempered 4340 steel. Isochromatic fringe patterns during crack propagation and crack arrest have been photographed successfully with an ultrahigh-speed Cordin camera and specially designed high-intensity and short-duration Xenon lamp system.
Fast Fracture and Crack Arrest
Author: George T. Hahn
Publisher: ASTM International
ISBN:
Category : Metals
Languages : en
Pages : 423
Book Description
Publisher: ASTM International
ISBN:
Category : Metals
Languages : en
Pages : 423
Book Description
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.