In this paper, we report on an experimental study of the deflection/penetration behavior of dynamic mode-I cracks propagating at two different crack velocities (slower and faster) toward inclined weak interfaces of three dissimilar angles (a): 30 , 45 and 60 . A simple wedge-loading specimen configuration as proposed by Xu et al. [Xu LR, Huang YY, Rosakis AJ. Dynamic crack deflection and penetr...

In stress analysis applications emphasis is placed on careful determination of the stresses for the improvement of design. In nondestructive testing importance is placed on reliability and quality, and as a result of this, observation of surface strains is of interest. Earlier photoelastic studies by El-Ebrashi et al 1-7 concerned, for the most part, two dimensional photoelasticity. In two dime...

Photoelasticity is a fast and powerful technique for internal stress detection quality control in crystals; to fully exploit its possibilities, an appropriate theoretical analysis must be developed different crystallographic structure observation planes. For cubic crystal specimen whose geometry non-coherent with directions (i.e., planes are not parallel), we write set of equations that allow e...

OBJECTIVE To analyze the shear forces on the vertebral body L4 when submitted to a compression force by means of transmission photoelasticity. METHODS Twelve photoelastic models were divided into three groups, with four models per group, according to the positioning of the sagittal section vertebrae L4-L5 (sections A, B and C). The simulation was performed using a 15N compression force, and t...

The question of whether static stress in fused silica relaxes at room temperature is still under debate. Here, we report experimental data investigating the behavior when subjected to tensile up 2 GPa levels different environmental conditions. Our measurements are performed using an innovative combination methods; a femtosecond laser used accurately load monolithic microscale test beam non-cont...