선박해양구조물용 강재의 변형률 속도에 따른 거동 특성

초록

Since it is known that mild steels are strongly dependent on the strain rates, this paper demonstrates the rate dependency for the various marine structural steels under certification of API and classifications. Mobilities of basic plasticity properties such as yield strength, engineering tensile strength, true tensil strength, plastic hardening exponent, and strength coefficient are compared based on the experimetal studies on the steels of API-2W-50, API- 2W-60, DH36, and EH36 steels. Parameters for most popular rate hardening constitutive models are also provided: Cowper-Symonds and Johnson-Cook models.