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Tensile and Creep Tests with 2-D Strain Mapping. Fatigue Tests – Endurance and Crack Growth Rates

Tensile and Creep Tests with 2-D Strain Mapping – The Reinhold Hermann creep laboratory at The Open University has recently been expanded and upgraded to provide a dedicated facility in support of our nuclear materials research programmes. It houses some 16 constant load frames, an Instron 100 kN slow strain rate machine and a Zwick 250 kN multi-purpose machine. Tests can be conducted in various atmospheres (air, inert gas or vacuum) at temperatures up to 1000°C. The averaged strain can be measured with special high-temperature gauges and/or mapped using digital image correlation (DIC). The ability to map the strains on the specimen surface allows, for example, the identification of the weakest region in cross-weld specimens, or determining multiple creep curves from a single test.

Fatigue Tests – Endurance and Crack Growth Rates – It is crucial to understand the fatigue behaviour of materials and structures subjected to cyclic loading, such as rotating components, chassis, pipes and integrated circuits. We can perform bespoke tests at temperatures ranging from -150 to 1000°C. We have the ability to control the tests based on load, displacement, strain, temperature, or even stress intensity factor by automatically measuring the crack length and feeding it back to the control software.

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