SM-102.01 Torsion Testing Machine

The torsion test is a destructive testing method that studies the plastic behaviour of materials. In practice, components that are twisted in their application (e.g. screws, shafts, axles, wires and springs) are studied with this test method. The experimental unit allows torsion tests in which specimens are subjected to load until they fracture. The clean layout and simple operation mean the experimental sequence can be observed in all details and phases. In the experiment, metallic specimens are twisted until they are destroyed by a typical shear fracture. The twisting moment is applied manually by means of a handwheel and a worm gear. The base plate is torsionally reinforced. A transparent protective cover protects against flying fragments. The effective twisting moment is measured by means of a moment-measuring shaft fitted with strain gauges and can be read directly on a display. The twisting angle is recorded by an incremental encoder and can also be read. The measured values are transmitted directly to a PC where they can be analysed using the software.   Specimens of different materials and different lengths are included in the scope of delivery. The measuring device can be moved on the rigid frame to adapt to different specimen lengths.

Learning Objectives

• Torsion tests with different materials and load until specimen fracture
• Determine the twisting strength
• Plot the diagram of twisting moment over twisting angle
• Influence of
• specimen material
• specimen cross-section
• specimen length