Dynamic stress intensity factors K-I, K-II and dynamic crack propagation characteristics of orthotropic material

The propagating crack problems of orthotropic material under the dynamic plane mode are studied in this paper. To analyze the dynamic fracture problems in an orthotropic material, it is important to know the dynamic stress components and dynamic displacement components around the crack tip. Therefore, the dynamic stress components and dynamic displacement components around the crack tip of an orthotropic material under the dynamic load and the steady state in crack propagation were derived. When the crack propagation speed approaches zero, it is assured that the dynamic stress components and dynamic displacement components derived in this study are identical to the those of the static state. Finally, the crack propagation characteristics are represented with mechanical properties of the orthotropic material and crack speeds. The faster the crack velocity, the greater the stress value of stress components in the crack tip. The stress component values of the crack tip are greater when the fiber direction coincides with the direction of the stress component than when the fiber direction is normal to the stress component.