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http://dx.doi.org/10.5574/KSOE.2011.25.3.073

Plasticity and Fracture Behaviors of Marine Structural Steel, Part V: Effects of Strain Rate and Temperature  

Choung, Joon-Mo (Dep't of Naval Architecture and Ocean Engineering, INHA University)
Im, Sung-Woo (Steel Structure Research Lab., RIST)
Kim, Kyung-Su (Dep't of Naval Architecture and Ocean Engineering, INHA University)
Publication Information
Journal of Ocean Engineering and Technology / v.25, no.3, 2011 , pp. 73-84 More about this Journal
Abstract
This is the fifth in a series of companion papers dealing with the dynamic hardening properties of various marine structural steels at intermediate strain rates. Five steps of strain rate levels (0.001, 1, 10, 100, 200/s) and three steps of temperature levels (LT ($-40^{\circ}C$), RT, and HT ($200^{\circ}C$)) were taken into account for the dynamic tensile tests of three types of marine structural steels: API 2W50 and Classifications EH36 and DH36. The total number of specimens was 180 pieces. It was seen that the effects of dynamic hardening became clearer at LT than at RT. Dynamic strain aging accompanying serrated flow stress curves was also observed from high temperature tests for all kinds of steels. The dynamic hardening factors (DHFs) at the two temperature levels of LT and RT were derived at the three plastic strain levels of 0.05, 0.10, 0.15 from dynamic tensile tests. Meanwhile, no DHFs were found for the high temperature tests because a slight negative strain rate dependency due to dynamic strain aging had occurred. A new formulation to determine material constant D in a Cowper-Symonds constitutive equation is provided as a function of the plastic strain rate, as well as the plastic strain level. The proposed formula is verified by comparing with test flow stress curves, not only at intermediate strain rate ranges but also at high strain rate ranges.
Keywords
Strain rate; Dynamic hardening factor(DHF); Cowper-Symonds constitutive equation; Dynamic strain aging; plastic strain;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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