In experimental stress and strain analysis, strain gauges are used to determine stresses and strains in components and structures. The maximum stresses and strains are key variables in terms of its structure, and ultimately dictate the dimensions of a component. Strain gauges provide the means required to evaluate mechanical stress and strains.

The FL 120 experimental unit can be used to measure the deflection and strain of a disk under different compressive loads. For this purpose, a thin disk, also called a membrane or diaphragm, is clamped into place and subjected to pressure. A cylinder with a hand-operated piston generates pressure in a maintenance-free hydraulic system. This pressure is indicated on a manometer. Strains on the surface of the membrane are recorded by strain gauges. The layout of the strain gauges at optimally selected points provides a comprehensive view of the stresses and strains over the entire disk. The maximum stresses and strains are calculated by applying the law of elasticity.

The strain gauge measurements are recorded and displayed by means of the FL 152 measuring amplifier. The measured values can be imported into the application software for visualisation to evaluate the experiment.

At the same time, the deflection of the membrane is measured by a dial gauge. The dial gauge can be moved along a cross-member, enabling measurements to be taken at any radius.