The present work summarizes some recent experimental, theoretical and numerical results on brittle fracture of isostatic polycrystalline graphite. The analyses have been carried out on V-notched samples under mixed mode (I+II), torsion and compression loading, considering various combinations of the notch tip radius, opening angle and notch tilt angle. | Review of local strain energy density theory for the fracture assessment of V-notches under mixed mode loading Engineering Solid Mechanics 2017 113-132 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Review of local strain energy density theory for the fracture assessment of V- notches under mixed mode loading Majid Reza Ayatollahia Filippo Bertob Alberto Campagnoloc Pasquale Gallod and Keke Tange a School of Mechanical Engineering Iran University of Science and Technology Narmak Tehran Iran b Department of Industrial and Mechanical Engineering NTNU Trondheim Norway c Department of Industrial Engineering University of Padua Padua Italy d Kyoto University Kyoto Japan e School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai China A R T I C L EI N F O ABSTRACT Article history The present work summarizes some recent experimental theoretical and numerical results on Received 6 October 2016 brittle fracture of isostatic polycrystalline graphite. The analyses have been carried out on V- Accepted 1 March 2017 notched samples under mixed mode I II torsion and compression loading considering Available online various combinations of the notch tip radius opening angle and notch tilt angle. The static 1 March 2017 Keywords strength of the considered specimens is assessed through an approach based on the strain Mixed mode energy density averaged over a control volume. The center of the control volume is located on Brittle failure the notch edge where the principal stress reaches its maximum value. The correct orientation Elasticity is obtained by a rigid rotation of the crescent-shaped volume while the size depends on the Blunt notches fracture toughness and the ultimate strength of the material. This methodology has been already Strain energy density used in the literature to analyze U- and V-shaped notches subject to mode I loading with very Graphite good results and advantages with respect
