Development of the multi-axial stress test machine and verification of crystal plasticity model

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A multi-axial stress testing machine for thin-walled tubular specimens has been developed in the present study. The test machine is capable of applying axial force, internal pressure and torque to a thin-walled tubular specimen. Using the testing apparatus developed in this study, the plastic deformation behavior under tri-axial stress state can be observed. This experimental evidence observed by this machine would provide meaningful information for validating the constitutive models for metals.