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A cohesive element with degradation controlled shape of the traction separation curve for simulating stress corrosion and irradiation cracking
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0002-6549-4342
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6896-1834
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). Ringhals AB, SE-43285 Varobacka, Sweden..ORCID iD: 0000-0003-1498-5691
2018 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 193, p. 172-196Article in journal (Refereed) Published
Abstract [en]

A cohesive element with extended environmental degradation capability was developed and implemented into an Abaqus user element. The element uses a virgin and a fully degraded Traction Separation Law (TLS) as input. The use of the potential based PPR model enables flexibility in the softening shapes for both TSL. When the element is degraded, the TSL gradually goes from the shape of the virgin material to the fully degraded TSL shape. This transition was made with a new parameter. that can govern a more ductile or brittle crack growth behaviour at degradation. The effect on the plastic zone due to changing the softening shape is shown, where the convex shaped softening TSL gives higher plastic dissipation and larger plastic zones than the concave and more brittle TSL. The new degradation method was evaluated against a Hydrogen Embrittlement (HE) experiment showing improved agreement with the experiment compared to the literature. The effect of different susceptibility zones at the crack tip was also investigated, showing that a uniform degradation throughout the susceptible zone is more influenced by the. parameter than a triangular susceptible zone.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 193, p. 172-196
Keywords [en]
Traction separation law, Intergranular stress corrosion cracking, PPR potential-based, User element, Hydrogen embrittlement
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-225695DOI: 10.1016/j.engfracmech.2018.02.011ISI: 000427918000013Scopus ID: 2-s2.0-8504238535OAI: oai:DiVA.org:kth-225695DiVA, id: diva2:1196819
Note

QC 20180411

Available from: 2018-04-11 Created: 2018-04-11 Last updated: 2018-05-22Bibliographically approved

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Alfredsson, BoEfsing, Pål

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