Polynomial evaluation of stress intensity factors of compact normal and shear specimens with an interface crack subjected to mixed-mode loading

A three-dimensional finite element analysis has been carried out for a compact normal and shear (CNS) specimen subjected to mixed-mode loading. The complex stress intensity factor, associated with an elastic interface crack, is discussed by the virtual crack extension method. The effect of Young's modulus and Poisson's ratio on the stress intensity factor for various kinds of mixedmode loading is discussed. The distribution of stress intensity factors along the crack front is investigated. A polynomial fit is proposed to evaluate the stress intensity factors at the midsection of the CNS specimen with an interface crack subjected to mixed-mode loading. The possibility of evaluating the stress intensity factors of CNS specimens with high accuracy by the present polynomial evaluation is demonstrated.

Keywords:

• Finite Element Method
• Stress Intensity Factor
• Fracture Mechanics
• Interface
• Crack
• Mixed Mode
• Virtual Crack Extension Method
• Polynomial Fit