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Date of Publication:2022-10-09

Journal:大连理工大学学报

Volume:52

Issue:3

Page Number:373-380

ISSN No.:1000-8608

Abstract:Oxygen cutting is the principal method for temporary hatch opening of
   hull structure.Residual stresses induced by oxygen cutting have a large
   influence on subsequent sealing and structure safety.Based on the oxygen
   cutting theory,a heat source model was proposed with the combination of
   preheating flame and reaction heat between iron and oxygen,and a
   numerical model was presented to simulate the cutting process on the
   basis of thermal elastic-plastic FE analysis,involving the temperature
   and stress distributions.A series of oxygen cutting experiments were
   performed,in which an infrared radiation was used for surface
   temperature measurement and the residual stresses were measured by
   impact-indentation measurement.As a result,the calculation results are
   consistent with the experimental values.The research concludes that
   there is a region that the tensile stress values exceed the yield point
   of material along the kerf,and the width of this region is influenced by
   cutting velocity,opening dimension and longitudinal constraints.

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