Dynamic Measurement of Two Dimensional Stress Components in Birefringent Materials

Abstract

We adopt classical methods of photoelasticity and Mach-Zehnder interferometry in a combined arrangement in order to determine both principal stresses and their orientations simultaneously. The method is equally applicable to static and dynamic problems. In dynamic problems the measurement may be made with a high-speed photodetector at very high temporal resolution at a single point or a small array of points depending on the detector array and recording device; this eliminates the need for a high-speed photographic system, but more importantly the method described here provides complete, time-resolved evolution of all stress components. Examples of application of the method are demonstrated.

Stress concentration near stiff inclusions: Validation of rigid inclusion model and boundary layers by means of photoelasticity

“…Experimental stress analysis near a crack or a void has been the subject of an intense research effort (see for instance Lim and Ravi-Chandar [19,20], Schubnel et al [25], Templeton et al [27]), but the stress field near a rigid inclusion embedded in an elastic matrix, a fundamental problem in the design of composites, has surprisingly been left almost unexplored (Theocaris [28]; Theocaris and Paipetis [29,30], Reedy and Guess [22]) and has never been investigated via photoelasticity. 1 Though the analytical determination of elastic fields around inclusions is a problem in principle solvable with existing methodologies (Movchan and Movchan [14], Muskhelishvili [15], Savin [24]) detailed treatments are not available and http://dx.doi.org/10.1016/j.engfracmech.2014.03.004 0013-7944/Ó 2014 Elsevier Ltd. All rights reserved.…”

Determination of the stress concentration in the corner point of the wedge-shaped region reinforced by a more rigid thin coating

“…Photoelastic analysis of the stress field around cuspidal points of rigid inclusions was reported by Gudos [1]. Lim and Ravi-Chandar in their work [2] applicated the classical methods of photoelasticity and Mach–Zehnder interferometry in a combined arrangement in order to determine both principal stresses and their orientations simultaneously. The work by Misseroni et al [3] demonstrated the photoelastic experimental investigations showing that the stress field near a stiff inclusion embedded in a soft matrix material can effectively be calculated by employing the model of rigid inclusion embedded in a linear elastic isotropic solid.…”

Numerical-experimental hybrid method for stress separation in digital gradient sensing method

“…Photoelasticity measures principal stress difference and the principal direction, and thus the stress components themselves cannot be obtained directly. Several methods have been proposed for stress separation in photoelasticity such as the shear difference method [14,15]; numerical analysis of the compatibility equation; oblique incidence and hybrid methods of photoelasticity and another experimental method [16][17][18][19]. However all the above methods for stress separation in photoelasticity are not suitable for that in the DGS method.…”