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Photoelastic Analysis Apparatus (SMT-SM-18)
Produce the mechanical stress curves through
2 linear polarising filters (polariser and analyser).
2 quarter-wave filters for generating circular
All filters have 360° angle scale and indicate the
main optical axis.
Filters mounted on roller bearings and can be
White light produced by a fluorescent tube and two
Monochromatic light (yellow) generated by sodium
Frame cross-members can be vertically adjusted.
Pressure or tensile forces generated by a threaded
Finished polycarbonate (PC) models available as
accessories for the demonstration.
Photoelasticity is a proven method of analysing and recording mechanical stresses and strains
in components. It is used both for quantitative measurements and for demonstrating
complex stress states. The components used are models made of a transparent,
photoelastically sensitive plastic, which becomes optically birefringent under mechanical
load. SMT-SM-18 is used to conduct photoelastic experiments on plane, transparent plastic
models. The models are subjected to load by external forces, and they are radiated by circular
polarised light. An analyser analyses the light penetrating the body. The experimental setup
comprises the separate components: a light source, two linear polarising filters (polariser and
analyser), two quarter-wave filters and a frame in which the models are attached and
subjected to load. The light source optionally permits coloured stress patterns with white
light or a light/dark representation with monochromatic light.