A simple methodology to visualize crack propagation for ceramic materials
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Analysis of the crack growth behavior is critical for fracture and thermal shock assessment. The current work presents a simple methodology to visualize cracks in ceramic materials. The procedure is exemplified for refractory materials on the basis of images obtained during mechanical loading using a wedge splitting test. Complementary in situ crack growth observation verify that for one of the materials growth and opening displacement of the main crack is accompanied by pronounced micro-cracking, branching, and bridging processes. Apparent fracture resistance and thermal shock resistance parameters are discussed.
KeywordsCrack Path Crack Growth Behavior Zirconia Additive Crack Extension Resistance Wedge Splitting Test
The authors wish to thank S. Dudczig and Prof. C.G. Aneziris (TU Freiberg) for making the refractory materials available and Dr. E. Wessel for his most valuable contribution to the controlled crack propagation studies in the SEM. The funding of the present work by the German Research Association (DFG) under the DFG grant SPP 1418 is gratefully acknowledged.
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