RESEARCH ON THE CUTTING THERMODYNAMIC BEHAVIOR OF HIGH-STRENGTH LARGE-THICKNESS OFFSHORE JACK-UP PLATFORM LEG RACK

摘要

The cutting of offshore jack-up platform leg rack is highly nonlinear and complex thermal processing process. The residual stress influences the following welding quality and causes crack growth. Therefore, research on the cutting practice of jack-up platform leg rack is significant to improving the safety and reliability of the offshore platform. A heating source model that is applicable to the cutting and emulation of high-strength thick plates has been presented. Then, the thermo-physical characteristic parameters of NV E690 leg plate was calculated by JMATPRO, and is revised according to the theory of metallographic. Furthermore, the numerical simulation of the linear cutting of leg plate was conducted, and the reliability of the heating source model and the thermo-physical characteristic parameters of material were proved by comparing them with the experimental data.