Crack Growth Characteristics Evaluation Method in Ceramics Based on DT Technique
A new method to evaluate the relationship between stress intensity factor KI and crack growth rate V of ceramics which is based on Double-Torsion (DT) technique was proposed. Materials were soda-lime glass, glass ceramics and alumina ceramics. Plate type DT specimens were prepared, and rectangular section guide groove was introduced in the upper surface of specimen. As a crack propagation test, a constant loading rate test was performed. Furthermore, a crack growth behavior was monitored by a compliance method. As the results, it was found that the clack growth behavior can be detected with high accuracy by using the proposed method. And it was confirmed that crack growth characteristic over wide range of crack growth rate can be evaluated by single experiment. Furthermore, since the method is based on a simple measurement system, it is considered that the method has a good availability for KI-V evaluation in ceramics.
Alan K.T. Lau, J. Lu, Vijay K. Varadan, F.K. Chang, J.P. Tu and P.M. Lam
T. Hitoo et al., "Crack Growth Characteristics Evaluation Method in Ceramics Based on DT Technique", Advanced Materials Research, Vols. 47-50, pp. 250-253, 2008