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论文类型：期刊论文

发表时间：2020-03-15

发表刊物：OCEAN ENGINEERING

收录刊物：EI、SCIE

卷号：200

ISSN号：0029-8018

关键字：Pitting damage; Uniaxial compressive behaviour; Mechanically induced pits; Failure mode; Generalized constitutive model

摘要：Local discontinuities and stress concentrations from pitting corrosion on a component can significantly affect the mechanical properties and failure mode of a structure, even though the total mass loss from pitting is not prominent. To analyse these problems, experimental specimens are created from high-strength steel DH36. Tests are performed to analyse the compressive behaviour of plate specimens with different dimensions and pitting crater parameters. And the influence of the above parameters on the uniaxial compressive mechanical properties and failure mode of the test specimens are investigated. Furthermore, the volume loss rate is found to be the most suitable damage indicator for describing the degradation in mechanical properties of specimens with pitting. Based on the test results and classical constitutive model, a linear-exponential model for strength failure specimens and a bilinear model for buckling failure specimens are created using the volume loss rate as a variable. The compressive mechanical properties of plate specimens with different degrees of pitting damage can be predicted with these models. The results show that under compression, the specimen with pitting damage is more likely to exhibit buckling failure than the undamaged specimen, especially when the undamaged specimen is in or close to the critical buckling state.