Different comparable stress theories from the field of materials science can be experimentally verified using this test unit. Different metal specimens can be stressed in a number of different axes. The load moment is applied by attaching weights to the perimeter of a circular load plate, which serves as a lever. Levers are used to clamp the specimen in the plate’s middle. Combination bending and torsion loading is produced by the defined places for applying force. In 10o steps, the load weight’s angular position can be adjusted. At the point of maximal deflection, which is diametrically opposed to the sites where the force is applied, the deformation is measured. By doing this, the measurement error brought on by the test apparatus’ deformation under load is minimized. Transverse forces are eliminated during specimen loading by compensating for both the dead weight of the plate and the weight of the load.
Experiments
- Multiple loading of metal specimens using combined torsion and bending
* determination of the yield point
* checking the direct stress hypothesis
* checking the shear stress hypothesis
Specifications
- Bench top unit for checking equivalent strain hypotheses from materials science
- Multiple axis specimen loading in bending or torsion, or a combination of both
- Compensation for the effect of dead weight
- Specimen length 49 mm, free clamping length 11.5 mm
- Specimen diameter Ø4 mm
- Load moment 0…3.8 N m, graduations 0.1 N m
- Deformation measured with dial gauge
- Specimens made of steel, copper, brass and aluminum
