Abstract
For constructing marine liquefied natural gas (LNG) fuel/storage tanks, high manganese steel is being recognized as an alternative to stainless steel, nickel alloy, and aluminum alloy. In this study, the nonlinear tensile behavior of high manganese steel was investigated and numerically simulated at cryogenic temperatures at which natural gas exists as a liquid. Physical experimental tensile tests were carried out for a flat test specimen at 293 K and 110 K. In particular, the tensile behavior of a flat hole-notched high manganese steel specimen was experimentally obtained. A specimen with a hole was readily fractured compared to one without a hole. Tensile behavior of high manganese steel at the two cryogenic temperatures was compared to that of stainless steel, nickel, and aluminum alloy. In addition, numerical tests were performed for flat tensile specimens under identical experimental conditions. The elastoplastic damage model was derived and implemented using an Abaqus user-defined subroutine to appropriately simulate material behavior and degradation. The influence of some parameters on tensile behavior was investigated. The simulation results satisfactorily replicated the nonlinear tensile behavior of high manganese steel. The proposed numerical method, which is based on the damage-coupled material constitutive model, can be applied to structural analysis on the finite element analysis platform considering mechanical nonlinearities induced by severe conditions such as cryogenic temperature.
Highlights
High manganese steel is an alloy steel with manganese content between 3% to 27% that exhibits improved mechanical characteristics and lower cost compared to industrial metallic materials such as mild steel, stainless steel, and aluminum alloy
The proposed numerical method, which is based on the damage-coupled material constitutive model, can be applied to structural analysis on the finite element analysis platform considering mechanical nonlinearities induced by severe conditions such as cryogenic temperature
This paper shows the nonlinear behavior of high manganese steel by applying finite element analysis (FEA) to the elastoplastic damage model
Summary
High manganese steel is an alloy steel with manganese content between 3% to 27% that exhibits improved mechanical characteristics and lower cost compared to industrial metallic materials such as mild steel, stainless steel, and aluminum alloy. Earlier studies reported that microstructural effects such as martensite formation and mechanical twinning contributed to the strengthening of high manganese steel and delayed the onset of necking, which is associated with large uniform elongation [24,25,26,27,28,29] Based on these features, strength-based design is typically performed for industrial structures and can lead to structural safety problems with respect to excessive deformation and rapid necking-fracture in high manganese steel. Several theoretical/computational studies on the development and application of material models have been carried out based on continuum damage mechanics, which was introduced as a method for expressing a nonlinear behavior and a degradation-failure behavior after reaching an ultimate tensile strength [30]. Demand for high manganese steel LNG fuel tanks by the shipbuilding industry is expected to increase
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