Material strength investigation

Determining the real characteristic values of materials or components is often essential for designing and optimising components in accordance with common standards and guidelines.

In addition to static strength values, such as yield strength, offset yield point and tensile strength, the fatigue strength of the materials used is particularly relevant for dynamically loaded systems. In general, the tension-compression alternating or pulsating fatigue strength of materials is determined using standardised specimens and tests. These tests are based on the DIN 50100 standard. The professorship's test rigs also offer the possibility to test boundary conditions that deviate from the standards, for example regarding specimen geometries, mean stresses, or test frequencies.

The finite or infinite life strength of the tested materials or components can be determined depending on the objective of the tests. Fractures occur in the finite life range or run-outs occur in the infinite life range depending on the applied stress amplitudes and mean stresses. The infinite life range is defined by the selected limit number of load cycles, which for metals is generally 5·10⁶ load cycles. A statistical evaluation can also be carried out using a sufficient number of specimens. Wöhler curves can be created from the determined finite and infinite life values. Complete finite and infinite life diagrams can then be obtained from several Woehler curves determined at different mean stresses.

• HPP100 - Hydraulischer Pulsatorprüfstand 100
• HPP250 - Hydraulischer Pulsatorprüfstand 250
• MRP100 - Magneterregter Resonanzprüfstand 100