Sensitivity of numerically modelled crack closure to material

0568286 - ÚFM 2025 RIV NL eng C - Conference Paper (international conference)
Kubíček, Radek - Vojtek, Tomáš - Pokorný, Pavel - Hutař, Pavel
Sensitivity of numerically modelled crack closure to material.
Procedia Structural Integrity. Vol. 42. Amsterdam: Elsevier, 2022 - (Moreira, P.; Reis, L.), s. 911-918. ISSN 2452-3216.
[ECF23 - European Conference on Fracture /23./. Funchal (PT), 27.06.2022-01.08.2022]
R&D Projects: GA ČR(CZ) GA22-28283S
Institutional support: RVO:68081723
Keywords : Finite element analysis * plasticity-induced crack closure * fatigue crack growth * high cycle fatigue
OECD category: Mechanical engineering

Crack closure is a phenomenon which slows down fatigue crack propagation and leads to higher residual life of components and
to a change in the crack front curvature. Because of the significant impact on the fatigue crack growth rate, the scientific and
engineering community has been trying to describe this phenomenon very precisely. One of the most frequently described
closure mechanisms is plasticity-induced crack closure (PICC) which is dominant in the Paris regime.
In the presented work, a CT specimen has been modelled three-dimensionally and the PICC estimations have been done for
different models of materials to investigate their sensitivity. The models were cyclically loaded by forces inducing maximal
stress intensity factor of 17 MPa√m at the load ratio 𝑅𝑅 = 0.1. The crack was curved according to conducted experiments. Even
though Newman’s equation estimates PICC almost constant, differences were observed from finite element simulations
Permanent Link: https://hdl.handle.net/11104/0352961