Experimental investigation of spur gear tooth mesh stiffness in the presence of crack using photoelasticity technique

Digital photoelasticity has rapidly progressed in the last few years and has matured into an industry-friendly technique. This review thematically classifies all the developments in digital photoelasticity and highlights the relative merits and drawbacks of the various techniques. The overall objective is to provide enough information and guidance to allow an end-user to make an informed choice on the type of technique to be used in a particular situation.

Digital photoelasticity – A comprehensive review

Review of RGB photoelasticity

Digital photoelasticity: Recent developments and diverse applications

Visualization of the three-dimensional structure and stress field of aggregated concrete materials through 3D printing and frozen-stress techniques

The influence of ambient illumination on colour adaptation in three fringe photoelasticity

Digital reflection photoelasticity using conventional reflection polariscope

In digital photoelasticity, one gets whole field information of isoclinic and isochromatic parameters based on intensity processing. Isoclinic values are undefined at isochromatic fringe contours and this appears as noise in the isoclinic phasemap which affects stress separation adversely. A new adaptive smoothing algorithm to remove the noise due to isochromatic-isoclinic interaction that automatically takes care of the isotropic points and π jumps present in the isoclinic phasemap is proposed. It is validated for the benchmark problem of a ring under diametral compression and verified for an angled bracket.

Adaptive Smoothing for Isoclinic Parameter Evaluation in Digital Photoelasticity

Digital photoelasticity is a whole field experimental technique which can analyze both 2-D and 3-D models. In this paper, stress frozen 3-D models are sliced mechanically and the whole field principal stress differences (Isochromatics) and principal stress directions (Isoclinics) are evaluated by capturing only five images using the standard optical arrangements of a conventional polariscope. The wrapped isoclinic values obtained by processing the first four colour polarization stepped images in the range -π/4 to +π/4 are unwrapped using adaptive quality guided phase unwrapping algorithm to get isoclinics in the range of -π/2 to +π/2. The total fringe order is evaluated by three fringe photoelasticity or RGB photoelasticity with its latest developments like colour adaptation combined with refined three fringe photoelasticity. The methodology is validated for two slices cut from aero-structural components.

T. Kasimayan

Papers

Digital photoelasticity – A comprehensive review

The influence of ambient illumination on colour adaptation in three fringe photoelasticity

Digital reflection photoelasticity using conventional reflection polariscope

Adaptive Smoothing for Isoclinic Parameter Evaluation in Digital Photoelasticity

Photoelastic analysis of stress frozen slices using five-step method