caa a22 4500 469124830 CHVBK 20180323133148.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00015616 doi (NATIONALLICENCE)springer-10.1007/BF00015616 A new method for evaluating fracture toughness of brittle materials [Elektronische Daten] [J. Tirosh, E. Altus, Y. Yifrach] A new testing procedure is suggested for measuring the fracture toughness of brittle materials as superconductors and ceramics. The idea is to perform a compression test on a subcompact square specimen which contains a central hole. The presence of the hole induces a tensile stress at a certain small region attached to the hole. In this region an artificial notch is introduced such that the fracture path satisfies a pure tensile opening mode (mode I) to which the linear fracture mechanics rules apply. The stress distribution on the fracture plane guarantees a certain amount of stable crack extension. The relationship between the critical compressive load and the stress intensity factor is formulated via an available Green function along with a numerical solution (FEM with ANSYS code). The testing procedure is demonstrated with specimens made of two types of tungsten carbide which differ by their grain size only. Test results are examined via fracture toughness and strength values produced by other conventional methods and the agreement is very good. The geometry and loading direction enable the fracture toughness results to be relatively insensitive to the notch tip radius and the crack length, thereby relaxing the requirements for accurate measurements. The small size of the suggested specimen (12.70mm×12.70mm×5mm) and the avoidance of gripping interfaces provide the major cost-wise advantages. Kluwer Academic Publishers, 1992 Tirosh J. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut Altus E. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut Yifrach Y. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut International Journal of Fracture Kluwer Academic Publishers 58/3(1992-12-01), 211-222 0376-9429 58:3<211 1992 58 10704 https://doi.org/10.1007/BF00015616 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00015616 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tirosh J. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut NATIONALLICENCE 700 1- Altus E. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut NATIONALLICENCE 700 1- Yifrach Y. Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, 3200, Haifa, Israel aut NATIONALLICENCE 773 0- International Journal of Fracture Kluwer Academic Publishers 58/3(1992-12-01), 211-222 0376-9429 58:3<211 1992 58 10704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer