Titanium 15 - 3 - 3 - 3 and Kevlar 49 are highly desired materials for structural components in cryogenic applications due to their low thennal conductivity at low temperatures . Previous tests have indicated that titanium 15 - 3 - 3 - 3 becomes increasingly brittle as the temperature decreases . Furthermore , little is known regarding the mechanical properties of Kevlar 49 at low temperatures , most specifically its Young 's modulus . This testing investigates the mechanical properties of both materials at cryogenic temperatures through cryogenic mechanical tensile testing to failure . The elongation , ultimate tensile strength , yield strength , and break strength of both materials are provided and analyzed here .