Material strength investigation

Determining real material or component characteristic values is often essential for component design and optimization using common standards and guidelines.

In addition to the static strength values yield strength or offset yield point as well as tensile strength, fatigue strengths of the materials used are particularly relevant for dynamically loaded systems. In general, tension-compression alternating fatigue strength or tension-compression pulsating fatigue strength is determined using standardized specimens and tests. The standard on which these tests are based is DIN 50100. 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.

Depending on the objective of the tests, the finite life or infinite life strength of the tested materials or components can be determined. Depending on the applied stress amplitudes and mean stresses, fractures occur in the finite life range or run-outs in the infinite life range, which is defined by the selected limit number of load cycles and for metals is generally at 5·10⁶ load cycles. Statistical evaluation can also be carried out with a corresponding number of specimens. Woehler curves can be created from the determined finite and infinite life values. In turn, complete finite and infinite life diagrams can be obtained from several Woehler curves determined at different mean stresses.

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