A novel notch stress intensity factor (NSIF) for U-notched specimens loaded under mixed mode is examined in this article. The concept is based on the averaged Strain energy density criterion, or alternatively on the cohesive zone model. as well as the equivalent local mode approach. To a certain extent, it is a generalisation of Glinka's NSIF for mode I, where sigma(tip) is replaced by sigma(max).The applicability of a fracture criterion based on this new NSIF is checked against 171 fracture tests with PMMA (at -60 degrees C) performed on U-notched specimens, with different notch root radii and loaded under mixed mode. The asymptotic behaviour of the new NSIF as the notch becomes a crack (when the notch root radius tends to zero) or when the notch disappears (when the notch root radius tends to infinity) is also discussed. (C) 2008 Elsevier Ltd. All rights reserved.
A generalised notch stress intensity factor for U-notched components loaded under mixed mode / G??mez, F. J.; Elices, M.; Berto, F.; Lazzarin, P.. - In: ENGINEERING FRACTURE MECHANICS. - ISSN 0013-7944. - 75:16(2008), pp. 4819-4833. [10.1016/j.engfracmech.2008.07.001]
A generalised notch stress intensity factor for U-notched components loaded under mixed mode
F. Berto;
2008
Abstract
A novel notch stress intensity factor (NSIF) for U-notched specimens loaded under mixed mode is examined in this article. The concept is based on the averaged Strain energy density criterion, or alternatively on the cohesive zone model. as well as the equivalent local mode approach. To a certain extent, it is a generalisation of Glinka's NSIF for mode I, where sigma(tip) is replaced by sigma(max).The applicability of a fracture criterion based on this new NSIF is checked against 171 fracture tests with PMMA (at -60 degrees C) performed on U-notched specimens, with different notch root radii and loaded under mixed mode. The asymptotic behaviour of the new NSIF as the notch becomes a crack (when the notch root radius tends to zero) or when the notch disappears (when the notch root radius tends to infinity) is also discussed. (C) 2008 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
