Effect of constraint on ductile crack growth and ductile-brittle fracture transition of a carbon steel
Yan, C. & Mai, Y. W. (1997) Effect of constraint on ductile crack growth and ductile-brittle fracture transition of a carbon steel. International Journal of Pressure Vessels and Piping, 73(3), pp. 167-173.
Ductile-brittle fracture transition was investigated using compact tension (CT) specimens from -70oC to 40oC for a carbon steel. Large deformation finite element analysis has been carried out to simulate the stable crack growth in the compact tension (CT, a/W=0.6), three point-point bend (SE(B), a/W=0.1) and centre-cracked tension (M(T), a/W=0.5) specimens. Experimental crack tip opening displacement (CTOD) resistance curve was employed as the crack growth criterion. Ductile tearing is sensitive to constraint and tearing modulus increases with reduced constraint level. The finite element analysis shows that path-dependence of J-integral occurs from the very beginning of crack growth and ductile crack growth elevates the opening stress on the remaining ligament. Cleavage may occur after some ductile crack growth due to the increase of opening stress. For both stationary and growing cracks, the magnitude of opening stress increases with increasing in-plane constraint. The ductile-brittle transition takes place when the opening stress ahead of the crack tip reaches the local cleavage stress as the in-plane constraint of the specimen increases.
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|Item Type:||Journal Article|
|Keywords:||fracture mechanics, size effects, geometry constraint|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Metals and Alloy Materials (091207)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Solid Mechanics (091308)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 1997 Elsvier Ltd.|
|Copyright Statement:||NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Pressure Vessels and Piping. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Pressure Vessels and Piping, [73, 3, (October 1997)] http://dx.doi.org.ezp01.library.qut.edu.au/10.1016/S0308-0161(97)00057-4|
|Deposited On:||25 May 2014 23:29|
|Last Modified:||30 May 2014 06:50|
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