Keywords
transverse sensitivity
finite element method
anisotropy
How to Cite
Abstract
This paper provides an analysis of the transverse sensitivity of a strain gage made with cold rolled, Cu-Ni foil (constantan) by examining the individual contributions of the grid lines and end loops of the strain gage. The analysis utilizes two types of finite element models. Two dimensional models of the electrical current flow through the grid lines and end loops are used to determine the electrical resistance of each component. Three dimensional models of the strain gage attached to a rigid substrate subjected to transverse loading are used to determine the surface strain in each component. Results of both models are combined to determine strain gage transverse sensitivity - replicating standards for physical measurement of transverse sensitivity. Several end loop configurations are considered including geometry (rectangular, curved, and H-shape); size (length and width), and foil material property (modulus of elasticity and electrical resistivity). The factors contributing most to transverse sensitivity of the strain gage are the electrical resistance and surface strain in the transverse direction of the end loops. Good correlation is found between analytical model results and physical test results.
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