Why is strain measured?
In the vast majority of cases, strains are measured using experimental stress analysis to determine the degree of stress on a material. The absolute values and the direction of mechanical load are determined from the measured strains and the known material properties (modulus of elasticity and Poisson's ratio). Hooke's Law provides the basis for this. Hooke's Law, in its simplest form, determines the direct proportionality of strain ε [m/m] and stress σ [N/mm2] of a given material based on its modulus of elasticity E [N/mm2].
σ = ε⋅E
How is strain measured?
Strain measurement using strain gauges (SGs) is the most frequently used method for strain measurement. These are predominantly used for experimental stress analysis, fatigue testing and in load cell construction . Strain gauges (SGs) are resistors that change their electrical resistance even with slight deformation of the component to be measured. These are glued to components that deform minimally under load. This deformation (strain) then leads to a change in the resistance of the strain gauge (SG).
Execution of the SG application
Such strain gauges (SGs) were also used in the experimental stress analysis for a load test on door fittings from Roto Frank Austria GmbH . The aim of the project was to measure the deformation of the sash hinge bodies and the brackets and to compare these with the results of the FEM analysis.
For this purpose, the sash hinge bodies and the brackets were fitted with strain gauges (SGs) at the most highly stressed points, which were determined in advance by FEM analysis.
The measurements were carried out on site at the Roto Frank Austria GmbH plant, documented and recorded in a meaningful results report.
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