Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique

Abstract

An experimental optical method has been developed for the measurement of opening and sliding notch face movements. The light passing through a thin slit is monitored by a photodiode detector. Two parts of the slit are fixed independently on the notch faces of the simulated crack. Dynamic variations of the notch face movements are recorded as an electric signal by an ‘oscilloscope. The sensitivity of such displacement measurement is comparable with the wavelength of light. Dynamic mixed-mode stress intensity factors under shock loading were evaluated from the data obtained and subsequently compared with a numerical simulation by ANSYS software. As it was approved, the technique has shown sufficient sensitivity, good linearity, and measurement reliability. Due to its non-destructive nature and overall robustness, the arrangement is applicable even for structural component condition determination taking into consideration potentially unknown boundary conditions and the non-linear character of mechanical parameters.

Analysis of Thermal Fracture for Nonhomogeneous Materials Plate with Multiple Cracks

“…Considering the crack propagation behavior, Zheng et al [14] theoretically investigated the altered G criterion by studying the critical volume to fracture process zone, deformation energy release rate ratio, and T-stress. Turis et al [15] evaluated the dynamic stress intensity factors under stock loading and compared them with a numerical simulation. The philosophy and exploratory outcomes that were previously depicted disclose some extent crucial attributes of nonhomogeneous materials, especially the heat fracture behavior.…”