Evaluation of Cryogenic Fracture Performance of Insulation Panel in LNG Carrier using Computational Method

摘要

This article proposes a methodology to evaluate the fracture performance using finite element analysis based on viscoplastic-damage model. The model is implemented to the commercial FEA code ABAQUS user defined subroutine UMAT. For validation, the primary barrier of the Liquefied Natural Gas carrier insulation system which comprises austenitic stainless steel 304L is assessed the fracture performance by experiment and simulation. Fracture test is carried out with respect to the double-edge-cracked tension (DECT) and the center-cracked tension (CCT) specimens at ambient temperature and cryogenic. Obtained simulation results are compared with experimental results and comparison results show overall good agreements. Advantages in the use of the proposed method for assessment of practical structural fracture performance are discussed.