Artigo de evento
URI permanente para esta coleçãohttps://repositorio.fei.edu.br/handle/FEI/5123
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Artigo de evento 0 Citação(ões) na Scopus Effects of plasticity on the elastic unloading compliance of C(T), Se(B) and clamped SE(T) specimens(2017-06-18) Gustavo Donato; ANDRADE, L. G. F.© 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.This paper investigates how plasticity affects instantaneous crack size predictions based on the elastic unloading compliance technique applicable to SE(B), C(T) and clamped SE(T) fracture mechanics specimens. Since this method assumes linear-elastic constitutive model, plasticity ahead of the crack may alter crack-size predictions due to residual stresses, local deformations, among other reasons. In order to better understand such effects and develop corrections, three materials were modeled with different hardening and same elastic modulus to represent modern high strength steels. Specimens were loaded, unloaded and reloaded considering large geometry change for varying CMOD values in order to induce varying levels of plasticity. Results show that for all specimens, specially for clamped SE(T), compliance will increase for larger CMOD values, showing that plasticity may affect crack size predictions and deserve further attention. A trend was found for the three geometries under investigation, being SE(T) the most affected.Artigo de evento 1 Citação(ões) na Scopus Effects of crack tunneling on the elastic unloading compliance of C(T), Se(B) and clamped SE(T) specimens(2017-06-18) Gustavo Donato; ANDRADE, L. G. F.© 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.This paper investigates how crack front curvature affects instantaneous crack size predictions based on the elastic unloading compliance technique applicable to SE(B), C(T) and clamped SE(T) specimens. Relative crack depths (a/W) of 0.2, 0.5 and 0.7, alongside five levels of crack curvature were considered. Crack front was modeled as a semi-ellipse. It was shown that for the same ASTM equivalent straight crack [1] compliance decreases as tunneling increases. Since the maximum crack curvature allowed by ASTM is very restrictive, compliance did not change much within that limit, but if violated, a remarkable deviation may occur. As a step to improve such techniques, a new formulation to determine the equivalent straight crack was developed. The new proposal shows reduced errors on compliance as crack curvature grows when compared to current ASTM proposal.