generate stress patterns with linear or circular polarised light

Description:

• 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.
• FL 200is 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.
• The polariser includes a polarising filter and a quarter-wave plate and generates circular polarised light.
• Behind the model is a second quarter-wave plate (perpendicular to the first one), which is combined with a second polarising filter.
• These form the analyser.
• The filters are mounted on rotating bearings and fitted with angle scales.
• Various polycarbonate models are mounted inside the frame.
• A load application device applies bending, tensile or compressive load to the model through a spindle.
• Stresses and strains occurring in the model are identifiable as bright spots, visualising the distribution of stress.
• The order of the dark isochromats is analysed to determine the principal stress differential.
• A wide selection of models such as notched bars, a wrench and a model-roller bearing or a rack-and-pinion is available as accessories.
• These ensure the implementation of comprehensive experiments.
• It is also possible to investigate your own models.

Technical Details:

Specification:

• produce the mechanical stress curves through photoelastic experiments
• 2 linear polarising filters (polariser and analyser)
• 2 quarter-wave filters for generating circular polarised light
• all filters have 360° angle scale and indicate the main optical axis
• filters mounted on roller bearings and can be pivoted
• white light produced by a fluorescent tube and two incandescent bulbs
• monochromatic light (yellow) generated by sodium vapour lamp
• frame cross-members can be vertically adjusted
• pressure or tensile forces generated by a threaded spindle
• finished polycarbonate (PC) models available as accessories for the demonstration

Technical Data:

• Light source:
  • lamp box with white diffuser
  • for white light:
• 1 fluorescent tube TL-E 32W/33 (colour: 33)
• 2 incandescent bulbs, candle lamp, frosted E14, 230V, 25W
• for monochromatic light (yellow):
  • 1 sodium vapour lamp SOX35, 35W
• Filter, mounted in glass, diameter: Ø 425mm:
  • 2 polarising filters (dark olive)
  • 2 quarter-wave filters (uncoloured)
• Frame: W x H: 600x750mm
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 800x600x750mm
• Weight: approx. 50kg

Learning Objections/Experiments:

• together with the accessories or your own models:
• generate plane stress states in various models under load: bending, tensile load and compressive load
• investigate stress distributions with linear or circular polarised light
• interpret photoelastic fringe patterns: stress concentrations, zero points, neutral strands, areas of constant stress and stress gradients
• graphically and computationally determine the stresses

Scope of Delivery:

• 1 frame with load application device
• 2 polarising filters
• 2 quarter-wave filters
• 2 filter mounts
• 1 light source
• 1 set of accessories
• 1 set of instructional material

Features:

• monochromatic or white light
• models for specific problems can be prepared by the user.

Accessories:

• Optional:
  • WP 300.09Laboratory trolley
  • FL 200.01Set of 5 photoelastic models
  • FL 200.02Model arch
  • FL 200.03Model crane hook
  • FL 200.05Set of 3 photoelastic models, comparison of notches
  • FL 200.06Model stresses on weld seams
  • FL 200.07Model wrench
  • FL 200.12Photoelastic material
  • FL 200.81 Ring force gauge 200 N
  • FL 200.82 Ring dynamometer 500N
  • FL 200.83 Ring dynamometer 1000N
  • FL 200.84 Ring dynamometer 2000N

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.