Fatigue Testing at Cryogenic Temperatures

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Fatigue Testing at Cryogenic Temperatures

Testing the mechanical tensile, compression and fatigue characteristics of metals at -196C (320F) requires full sample submersion into liquid nitrogen. TestResources has developed a system with a LN2 cryostat. The test machine in this application is special test machine that includes a LN2 cryostat. A large LN2 cryogenic dewar is located under the actuator. Prior to submersion, a test sample is gripped and a special low temperature extensometer mounted on the sample. The frame includes a sub frame located below the actuator so that the loads are reacted against inside the test environment. During setup, the crosshead is lowered, with actuator extended until the subframe is submerged in the media. The cryostat is modular and can be removed for easy ambient test applications.