Direct strain and slope measurement using 3D DSPSI

TL;DR

This paper introduces an advanced 3D DSPSI method that accounts for beam divergence, integrates surface shape measurement for nonplanar surfaces, and utilizes small shear distances, demonstrated on a shear test with comparison to DIC.

Contribution

The paper presents a novel 3D DSPSI implementation with improved accuracy and applicability to nonplanar surfaces, enhancing strain and slope measurement techniques.

Findings

Successful application on a shear test demonstrating accurate measurements

Comparison shows advantages over classical DIC methods

Enhanced model accounts for beam divergence and surface shape variations

Abstract

This communication presents a new implementation of DSPSI. Its main features are 1. an advanced model taking into account the beam divergence, 2. the coupling with a surface shape measurement in order to generalize DSPSI to nonplanar surfaces 3. the use of small shear distance made possible using a precise measurement procedure. A first application on a modified Iosipescu shear test is presented and compared to classical DIC measurements.