Investigation of cracking in small punch test for semi-brittle materials

•FE model captures crack initiation and propagation in Small Punch flat and tube specimens.•Good agreement between experimental and calculated force–displacement curves.•Model captures crack initiation in cold-worked materials with different levels of ductility.•Damage in the material affects force–...

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Bibliographic Details
Published in:Theoretical and applied fracture mechanics 2020-08, Vol.108, p.102646, Article 102646
Main Authors: Simonovski, Igor, Holmström, Stefan, Baraldi, Daniele, Delville, Rémi
Format: Article
Language:English
Subjects:
Brittle materials
Claddings
Cold working
Computer simulation
Crack propagation
Cracking (fracturing)
Damage assessment
Dual phase steels
Ductility
Evaluation
FE simulation
Ferritic stainless steels
Finite element method
Fracture
GTN model
Impact damage
Martensitic stainless steels
Mathematical models
Miniature testing
Model accuracy
Nodular iron
Small Punch
Ultimate tensile strength
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Summary:•FE model captures crack initiation and propagation in Small Punch flat and tube specimens.•Good agreement between experimental and calculated force–displacement curves.•Model captures crack initiation in cold-worked materials with different levels of ductility.•Damage in the material affects force–displacement curves in vicinity of maximal force. The Gurson-Tvergaard-Needleman damage model is implemented in Small Punch (SP) finite element model with the purpose of evaluating the influence of crack initialization and propagation on the SP force–displacement (F-v) curves and the maximum force, Fm, which is used for estimating the Rm. Five materials, significantly different in Rm and ductility are investigated. Numerical calculations are performed and compared to the experimental measurements to evaluate the accuracy of the model. It is shown that the model is capable of capturing crack initialization in cold worked 15-15Ti stainless steel samples with different levels of ductility, both in terms of the number of cracks and their positions. For these two materials and the more ductile P91, P92 ferritic/martensitic steels, the simulations indicate significant impact of damage on the F-v curves in the vicinity of the maximal force, Fm. This can significantly influence the estimation of Rm from the Fm and vm points. However, the model tends to predict the crack initialization at a larger displacement compared to the experiments.
ISSN:0167-8442
1872-7638
DOI:10.1016/j.tafmec.2020.102646