STR15 - Experiment

PLASTIC BENDING OF BEAMS

An experimental apparatus to allow students to investigate the practical plastic bending of beams.

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The experiment hardware fits onto a Structures Test Frame (STR1, available separately). Students fix a specimen beam in chucks at both ends of a backboard. The chucks can either clamp the beam (encastré fixing), or hold it on a knife-edge. The students then load the beam using a screw mechanism and electronic load cell. 

The load cell connects to a Digital Force Display (STR1a, available separately) which displays the load as the beam deforms. A long-travel digital deflection indicator on the backboard measures specimen deformation. To compensate for the specimen shortening as it deforms, one of the chucks moves along the backboard, relative to the deformation. 

Students continue to apply a load until the specimen beam is in the fully plastic condition, that is, the beam has undergone plastic collapse. They then compare the beam behaviour with theoretical predictions based on traditional yield stress theory. 

The lecturer guide provides details of the equipment including sample experiment results. The student guide describes how to use the equipment and gives experiment procedures. 

For extra ‘virtual’ experiments, TecQuipment can supply the optional TecQuipment Structures Software (STRS), for use on a suitable computer. The virtual experiments simulate the tests you can perform with the hardware. They also extend the choice of tests beyond that available using only the hardware, for example: higher loads, uniform loads or different test specimens. This extends the student’s learning experience. 

For automatic data acquisition of your experiment results, TecQuipment can supply the optional Automatic Data Acquisition Unit (STR2000). Supplied as standard with the STR2000 is TecQuipment’s Structures Software that displays and logs your experiment results and gives the extra virtual experiments.

  • Relationship between load and deflection for beams loaded to the plastic condition
  • Introduction to form factor
  • Introduction to limit state design
  • Relationship between maximum loading and plastic hinge formation for a simply supported beam, a propped cantilever and a fixed beam
STR1 - Base Unit

A sturdy lightweight aluminium bench-mounting frame to provide rigid support for the interchangeable experimental modules in TecQuipment's Structures Range (STR2 -STR20).

STR1A - Ancillary

A hardware module to simultaneously measure and display the output of up to 4 force sensors mounted on experiments in TecQuipment's Structures Range (STR2 -STR20).

STR15A - Specimen
A set of 12 fully annealed mild steel replacement specimen beams for use with STR15 Plastic Bending of Beams apparatus.
STR2000 - Ancillary

A computer interface module with ADA software that allows the hardware experiments in TecQuipment's Structures Range to be interfaced to a PC.

SM1000G - Experiment

Test leaf Spring, knife edges and attachments to allow leaf spring and beam bending tests with TecQuipment's SM1000 Universal Test Machine.