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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Rozvoj kuželových trhlin při "Ball on the Three Balls Test"
 Chlup, Zdeněk ; Harrer, W. ; Kozák, Vladislav ; Řehořek, Lukáš
Proposed ball on three balls test takes advantage of biaxial loading and very simple experimental setup allowing usage of various test-piece geometries. The loading configuration is insensitive to small inaccuracies of disk shape. The only relevant parameter playing significant role is the thickness of test-piece. The three supporting and one loading balls eliminate disadvantage of ring of ring test mentioned above. From the experiences of numerical analyses as well as experimental results is still unclear influence of contact stresses between test-piece and loading ball on resulting stress field respectively the influence of cone crack developed due to such stresses. The main aim of this paper is to describe possibility of cone crack development due to contact stresses.
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Application of centrally loaded disk on the three supports for strength evaluation of brittle materials
 Chlup, Zdeněk ; Kozák, Vladislav ; Supancic, P.
Development in advanced ceramics and brittle matrix composites enables use of these materials for industrial application irrespective of their brittleness. Obtaining relevant mechanical properties is extremely essential for components design. However, mechanical properties corresponding to the real loading conditions are unknown due to absence of testing procedure providing such results. The proposed "ball on three balls" test is a promising method for biaxial loaded components. Aim of this contribution is to describe advantages and limitations when B3B test is used from both configuration and material point of view. Numerical analysis of three-dimensional model at various loading, geometrical and material conditions was used. Optimal testing conditions were determined and possible errors were identified from error analysis.
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