Numerical Simulation Analysis Of Crack Opening Of 1.25Cr-0.5Mo Under Fatigue-Creep Interaction

Typical pressure chemical equipments such as pressure vessels are applied widely on the processing industry like petrochemical engineering. These equipments work under condition of high temperature or high pressure, and some of them are over the limited service time. As the petrochemical technology developing on, it requires more serious working condition that equipments can bear. During the manufacture, installation and service, it would create some flaws like crack inevitably. These cracks will keep opening under the condition of high temperature, high pressure and corrosion, especially for the equipments that are start-up and shutdown frequently and working intermittently with high temperature and high pressure. According to related national low, the period of equipment checking is longer than before. Therefore, crack opening rules researches under complicated working conditions are very important and urgent for researchers.Based on wide range of reading discourses, this article researches crack opening rules of 1.25Cr-0.5Mo with ANSYS, which is used widely in the high temperature equipments of petrochemical industry, under the conditions of high temperature creep, cycle loading and fatigue-creep interaction. It obtains different crack opening rules under different conditions, and compares the effect of temperature, stress amplitude and average value of cycle loading. In the processing of analysis with ANSYS, it uses damage accumulation method to track the crack opening, which can better the reliability.