Title
Determination of parameters for the damage mechanics approach to ductile fracture based on a single fracture mechanics test
Author
Copppejans, O.J.
Walters, C.L.
Publication year
2017
Abstract
The local approach to modelling ductile tearing is a useful technique to give insight into fracture mechanics. However, applications of the local approach have been stymied by the high cost of finding the parameters that characterize it because of the number of specimens and expensive post-processing that the testing requires. In this paper, a novel iterative method to extract a failure locus from one Crack Tip Opening Displacement (CTOD) specimen is presented. Material points fail under various different stress states in a CTOD specimen, so many different points on the failure locus can be found through thoughtful post-processing in FEA. A phenomological ductile failure locus is fitted through the stress triaxiality, Lode angle, and plastic strains that cause failure at material points in the CTOD test. Simulating a CTOD test with a different aspect ratio has shown that the failure locus found by this method can be predictive, giving both accurate force versus Crack Mouth Opening Displacement (CMOD) curves and realistic fracture surfaces featuring separate tunnelling and shear lips.
Subject
2015 Fluid & Solid Mechanics
SD - Structural Dynamics
TS - Technical Sciences
Maritime & Offshore
Marine
Energy
The local approach
Steel
Fracture
CTOD
Ductile
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http://resolver.tudelft.nl/uuid:affc3cdb-8107-46ca-b8b2-694397702ab0
TNO identifier
772443
Source
Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE, June 25-30, 2017, Trondheim, Norway, 1-12
Article number
OMAE2017-61425
Document type
conference paper