Prediction of the fracture toughness of a ceramic multilayer composite – Modeling and experiments

Optimal strength and toughness of Al2O3–ZrO2 laminates designed with external or internal compressive layers

“…This approximation may lead to an overestimation of the calculated apparent fracture toughness in the ATZ layers of Table 2 Weight function coefficients (A νμ ) for a 3-point bend bar determined by the "boundary collocation method" 34 the ICS-laminates and in the A layers of the ECS-laminates, owed to the lower stiffness of the adjacent AMZ and AZ layers, respectively. 35,36 In this regard, an alternative procedure has been proposed elsewhere, 37 to predict in a more accurate way the fracture toughness of multilayered ceramics whose layers have different elastic properties. Nevertheless, this level of accuracy is beyond the scope of this work.…”

On problems with the determination of the fracture resistance for materials with spatial variations of the Young’s modulus

“…Case studies based on the configurational force concept have shown that in materials with constant elastic material properties, spatial variations of the yield stress, see Kolednik (2000) and Kolednik et al (2010), or spatial variations in residual stresses, see, e.g., Chen et al (2007) or Rakin et al (2009), can also alter significantly the crack driving force. In such cases, the same problem with the correct experimental determination of the fracture toughness occurs.…”

Mechanical properties of textured ceramics from muscovite–kaolinite alternate layers

“…32 Fig. 2b shows the alternate layers with different microstructures: (a) mullite layers oriented in-plane (bright zones in Fig.…”