Ductile crack initiation and propagation in steel bridge piers subjected to random cyclic loading

2014 ◽  
Vol 59 ◽  
pp. 809-820 ◽  
Author(s):  
Hanbin Ge ◽  
Lan Kang
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Bridge Piers ◽  
Steel Bridge ◽  
Ductile Crack ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

Crack initiation and propagation in aluminum alloys with coatings during cyclic loading

1980 ◽  
Vol 19 (3) ◽  
pp. 170-172
Author(s):  
L. P. Gerasimova ◽  
Yu. P. Guk ◽  
B. M. Solov'ev ◽  
N. M. Piskareva ◽  
T. V. Surikova
Keyword(s):  
Aluminum Alloys ◽  
Cyclic Loading ◽  
Crack Initiation ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

Crack Initiation and Growth in Bimetallic Girth Welds

2014 ◽  
Author(s):  
Antonio Carlucci ◽  
Nicola Bonora ◽  
Andrew Ruggiero ◽  
Gianluca Iannitti ◽  
Domenico Gentile
Keyword(s):  
Crack Initiation ◽  
Damage Mechanics ◽  
Damage Model ◽  
Mouth Opening ◽  
Crack Mouth Opening Displacement ◽  
Model Parameters ◽  
Ductile Crack ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation ◽  
Girth Welds

Bimetallic girth welds are characteristics of clad pipe technology. When dealing with propagation issues, fracture mechanics concepts usually are no longer applicable as a result of the extensive and non-homogeneous plastic deformation along bi-material interface that occur at the crack tip even below design allowables. In this study, ductile crack initiation and propagation in bi-material girth welds was investigated using a Continuum Damage Mechanics (CDM) model proposed by Bonora [1]. For the base, weld and clad metal, ductile damage model parameters have been determined by means of inverse calibration technique using fracture data obtained on smooth and round notched tensile bar specimens. Firstly, the damage model was validated predicting ductile crack growth occurring in single end notch (SEN(T)) geometry sample comparing the applied load vs crack mouth opening displacement with experimental measurements. Successively, the model was used to investigate ductile crack initiation and propagation for under clad circumferential weld crack under remote tension.

Crack initiation and propagation in Chromium pre-alloyed PM-steel under cyclic loading

2008 ◽  
Vol 75 (3-4) ◽  
pp. 750-759 ◽  
Author(s):  
R. Gerosa ◽  
B. Rivolta ◽  
A. Tavasci ◽  
G. Silva ◽  
A. Bergmark
Keyword(s):  
Cyclic Loading ◽  
Crack Initiation ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

Numerical Analysis of Influence of the Martensite Volume Fraction on Dp Steels Behavior During Plastic Deformation / Analiza Numeryczna Wpływu Ułamka Objetosci Martenzytu Na Zachowanie Stali Dp Podczas Odkształcenia Plastycznego

2013 ◽  
Vol 58 (1) ◽  
pp. 211-215 ◽  
Author(s):  
K. Perzynski ◽  
Ł. Madej
Keyword(s):  
Crack Initiation ◽  
Volume Fraction ◽  
Failure Behavior ◽  
Ductile Crack ◽  
Crack Initiation And Propagation ◽  
Martensite Volume Fraction ◽  
Propagation Behavior ◽  
Initiation And Propagation ◽  
Digital Material ◽  
Dp Steels

Development of a comprehensive fracture model, which takes into account crack initiation and propagation behavior at the microscale level in the Dual Phase (DP) steels is presented in the present paper. At this stage of the research Authors proposed a numerical model, which takes into account ductile crack initiation and propagation through the ferrite phase. Developed model is based on digital material representation (DMR) of DP microstructure, which takes opportunity for modeling crack phenomena in an explicit manner. Proposed model of ductile crack behavior in the ferritic phase is based on the Johnson-Cook model. Particular attention is put on investigation of influence of martensite volume fraction in microstructure on failure behavior. Obtained results for two significantly different martensite volume fractions in the investigated microstructure are presented in this work

Crack Initiation and Propagation Clad Pipe Girth Weld Flaws

2014 ◽  
Author(s):  
Antonio Carlucci ◽  
Nicola Bonora ◽  
Andrew Ruggiero ◽  
Gianluca Iannitti ◽  
Gabriel Testa
Keyword(s):  
Crack Initiation ◽  
Large Scale ◽  
Damage Mechanics ◽  
High Fracture Toughness ◽  
Model Parameters ◽  
Equivalent Material ◽  
Ductile Crack ◽  
Crack Initiation And Propagation ◽  
Brittle Ductile Transition ◽  
Initiation And Propagation

At present, design standards and prescriptions do not provide specific design routes to perform engineering criticality assessment (ECA) of bimetallic girth welds. Although the authors has shown the possibility to implement ECA in accordance with available prescriptions of such flawed weld joint following the equivalent material method (EMM), when dealing with ductile crack initiation and propagation — as a result of the large scale yielding occurring at the crack tip for high fracture toughness material operating in the brittle-ductile transition region — fracture mechanics concepts such as JIc or critical CTOD may breakdown. In this work, the possibility to accurately determine the condition for ductile crack growth initiation and propagation in bi-metallic girth weld flaws using continuum damage mechanics is shown. Here, the base metal as well as the clad and the weld metal have been characterized to determine damage model parameters. Successively, the geometry transferability of model parameters has been validated. Finally, the model has been used to predict crack initiation for two bi-material interface circumferential crack configurations.

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