tailieunhanh - Some recent criteria for brittle fracture assessment under mode II loading

Different criteria are available in the literature to assess the fracture behaviour of sharp V-notches. A typical and well-known criterion is based on the application of the notch stress intensity factors (NSIFs), which are able to quantify the intensity of the stress fields ahead of the notch tip. | Nội dung Text Some recent criteria for brittle fracture assessment under mode II loading Engineering Solid Mechanics 2017 31-38 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Some recent criteria for brittle fracture assessment under mode II loading Alberto Campagnoloa and Filippo Bertob a Department of Industrial Engineering University of Padova Via Venezia 1 35131 Padova Italy b Department of Engineering Design and Materials NTNU Richard Birkelands vei 2b 7491 Trondheim Norway A R T I C L EI N F O ABSTRACT Article history Different criteria are available in the literature to assess the fracture behaviour of sharp V- Received 6 July 2016 notches. A typical and well-known criterion is based on the application of the notch stress Accepted 2 October 2016 intensity factors NSIFs which are able to quantify the intensity of the stress fields ahead of Available online the notch tip. This work considers two recent energy-based criteria applied here to sharp V- 3 October 2016 Keywords notches. The first criterion is based on the averaged value of the strain energy density SED Sharp V-notch while the second one called Finite Fracture Mechanics FFM criterion is available under two Brittle failure different formulations that by Leguillon et al. and that by Carpinteri et al. Considering the In-plane shear loading averaged SED criterion a new expression for estimating the control radius Rc under pure Mode Notch stress intensity factor II loading is proposed and compared with the sound expression valid under pure Mode I Strain energy density loading. With reference to pure Mode II loading the critical NSIF at failure can be expressed as a function of the V-notch opening angle. By adopting the three criteria considered here the expressions for the NSIFs are derived and compared. After all the approaches are employed considering sharp V-notched brittle components under in-plane shear loading in order to investigate the .