The mechanical response of three periodic cellular structural designs was investigated utilizing four strain rates, from 0.0001 sec-1 to 0.0010 sec-1, under uniaxial compression.  The test specimens were additively manufactured out of Inconel 718 using a common cell size and surface thickness, which resulted in a relative density range of 21% to 37%, based on cellular design.  It was found that over this range of strain rates the mechanical responses of these structures were relatively insensitive to the applied strain rate.  The modulus of elasticity, yield strength, plateau stress, and absorbed energy showed little variation, and was considered within normal response tolerances accounting for variation in manufacture.

Low Strain Rate Sensitivity of Additively Manufactured Periodic Cellular Structures

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