Experimental And Demonstration Polariscope

Experimental And Demonstration Polariscope

It is placed on an overhead projector (not supplied), with the image projected on to a screen, and, used either in a laboratory or a lecture theatre, allows a striking demonstration of the stress fields in the loaded models. It is also designed for quantitative work for tensile, compressive or flexural loading. A system – unique to this unit – also allows the simultaneous rotation of the polarizer and the analyser for the isoclinal lines study.

• A model-loading frame.
• An elastic load-measuring device, which uses a steel spring beam, and a micrometer dial gauge.
• The device has a linear deflexion/load relation-ship.
• A rotatable circular polarizing unit, in a graduated mount, carried on runners under the loading frame.
• A quarter ware plate.
• A rotatable circular analyser can be rotated through 180°.

The three units are carried on a pillar integral with the loading frame. The polarizer and the analyser are coupled so that they may turn simultaneously.

• A set of fixtures required for the application of the loads to all the models supplied.
• A set of models in the appropriate photo elastic material for example, a disk, a ring, a beam, etc.
• Polarizer diameter : 200 mm
• Model loading area : 190 x 220 mm.
• Light source : standard overhead projector source (white light). Monochromatic light obtained with green filter swung into path of light beam.
• Maximum load on models : ± 40 kg.

Teaching objectives

• Observation of the stress concentration.
• Study of strength of materials.
• Structures analysis in civil engineering

• Strength of materials.
• Structures, civil engineering and architecture.
• Applied mechanics, machine design, and welding technology.
• Soil mechanics.
• Biomechanics.

Dimensions and weight

• 420 x 320 x 350 mm.
• Net weight : 4 kg.

Essential requirements

• Additional Equipment required.
• Overhead projector.

Complementary equipment

• Analogue field plotters, 24 channels .
• This unit can be used in conjunction with the Polariscope for the separation of the principal stresses.