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对某超超临界机组高压内缸的高温蠕变强度进行了研究,利用ABAQUS建立了高压内缸三维有限元模型,并进行了计算分析.结果表明:在稳态工况下高压内缸最大应力低于相应温度下材料的屈服强度,未达到屈服状态;高压内缸蠕变应变发生区域主要集中在进汽口及平衡活塞处;多轴效应对蠕变考核具有重要影响,采用多轴蠕变应变进行蠕变强度考核准确度更高;高温蠕变所引起的应力松弛使得螺栓热紧力下降,对2×105 h蠕变后的高压内缸中分面汽密性产生影响.
The high-temperature creep strength of a high-pressure inner cylinder of an ultra-supercritical unit was studied, and a three-dimensional finite element model of a high-pressure inner cylinder was established by ABAQUS, and the calculation and analysis were carried out. The results show that under the steady- Below the corresponding temperature, the yield strength of the material does not reach the yield state. The creep strain of the high-pressure cylinder is mainly concentrated at the inlet and the balance piston. The multi-axial effect has an important influence on the creep assessment. Multiaxial creep Strain creep strength assessment accuracy higher; high temperature creep caused by stress relaxation makes the bolt thermal stress decreased, after 2 × 105 h creeping high pressure cylinder faceted steam density impact.