Solid material rigidity modulus measurements by a nondestructive optical method: application to electrical steering system

摘要

We propose a new non destructive optical method for the determination of the shear modulus G of solid materials. The shear modulus is determined by measuring the twisted angle θ as a response of the material sample, depending on an applied force. The measuring of this twisted angle is obtained by using an adapted polarimetric sensor. The effective measurements of rigidity modulus G for different materials were experimentally achieved, we obtained respectively 1.4464.1010 N/m2, 0.99417.109 N/m2 and 1.0395.1011 N/m2 for Aluminum, PMMA and Steel. The study has demonstrated the effective usefulness of our method for evaluating the rigidity modulus. A good agreement between the theoretical and experimental results was achieved. This study permit to design and elaborate a new type of optical torque sensor for electrical power assisted steering system.