Microcrack density

Figure 23. Effect of radiation and thermal cycling between —115 C and 80 C on microcrack density. (Reproduced from reference 8.)...

Figure 8. Temperature dependence of microcrack density in quartz grain.

Fig. 54. Schematic of indentation damage for (a) Vickers and (b) spherical indentations in zirconia-based ceramics. Dark areas comespond to higher microcrack density. Dashed lines show the elastic-plastic boundary. After Reference [251].

Aim O, Jaktlund L L. The influence of microcrack density on the elastic and fracture mechanical properties of Stripa granite[J], Physics of the Earth and Planetary Interiors, 40(3), 161 (1985). 

Using Equation (28) to describe the microcrack density, the incremental modulus of the material is computed using Equation (2), where is substituted for n. The modulus E computed is then treated as a tangent modulus for the material because frictional effects are history-dependent and act over a particular load increment. Thus, the constitutive behavior was computed using... 

Furthermore, the microcrack density in the surface of the specimen did not increase as the temperature difference increased from 400 to 500 °C. Figure 22c shows the surface micrograph of the oxidized specimen quenched at a temperature difference of 600 °C. From Figures 22b and c, the microcrack density in the surface of the specimen noticeably decreased, and the microcrack size rapidly increased with temperature difference. The surface micrograph of the oxidized specimen quenched at a temperature difference of 700 °C is shown in Figure 22d the microcrack den-... 

Conventional progressive models deal with the stiffness reduction caused by matrix cracking as a function of microcrack densities, resulting in strength reduction of a laminate [7-9]. If transverse matrix cracking is encountered in layers, q, and... 

---