复杂多接触面托圈热-机械耦合三维有限元分析

NUMERICAL SIMULATIONS OF THERMAL-MECHANICAL STRESS OF CONVERTER LOOP WITH COMPLICATED MULTI-CONTACT SURFACES BY 3-D NONLINEARING FINITE ELEMENT

转炉托圈是一个重型的复杂空间焊接结构,在使用中承受机械载荷以及长期温度载荷。托圈所承受的机械载荷经由多个复杂的接触面接触传递,所承受的热负荷是经由热辐射和接触面热传导形成的温度载荷。为了分析托圈结构的强度和变形,文中建立含多个复杂接触面的托圈三维热弹性有限元模型,利用建立的模型完成托圈温度场、应力场和变形场的计算分析,分析结果应用于实际托圈结构的优化设计和制造。实践表明,计算分析结果可以作为结构强度评估和结构优化设计的可靠依据,为大型托圈结构的安全可靠性分析提供依据。

Converter loop is a heavy dimensional structure with complicated welded parts. There is a typical problem of the coupling of thermal and mechanical deformations in the application due to the bearing of large mechanical loads and thermal loads at the same time. The mechanical loads are applied by multi-contact mode upon the complex surfaces and the thermal loads are applied by heat radiation and heat conduction across contact surfaces. To analyze the loop strength and deformations, a 3-D thermal elastic finite element model that contained complicate multi-contact surfaces was built. Based on the model, the thermal fields and the distributions of stresses and deformations were simulated. The numerical results have been applied to the loop optimized design and manufacture. Its operation experience shows that the numerical results can provide reasonable data for the loop optimized design and also can be an illustration of the estimation of structural integrality of heavy converter loop.