离心压气机包容结构连接螺栓建模方法

为研究离心压气机包容结构的抗冲击能力，对连接螺栓建立多种有限元模型，开展数值仿真研究，分析比较不同建模方法的数值仿真结果与计算特性，并在高速旋转试验台上开展了离心叶轮轮盘破裂包容性验证试验。结果表明:蛛网多点耦合模型、固连失效接触模型和梁-壳离散弹簧模型计算量少，计算效率高，但无法准确体现高能冲击载荷的传递和连接部位突加应力、应变的分布与变化；螺栓实体模型较为复杂，所需计算时间长，但能够充分体现螺栓变形以及与螺栓孔的相互作用，与试验结果有较好的一致性。 

Modeling method of connecting bolts in centrifugal compressor containment structure

To investigate the impact resistance of centrifugal compressor containment assembly, numerical simulation of connecting bolts in specific compressor was conducted. Four modeling methods of bolts were established, simulation results and characteristics were discussed. Verification tests on high-speed spin tester were conducted. Results indicated that the Spider multi-point coupling model, tiebreak contact algorithm, beam-shell-discrete spring model took the advantage of high computing efficiency, but made large deviation in stress, strain and impacting loads. The solid model computed slowly but could describe the interaction of the bolts and holes, showing better agreement with the test.