论文部分内容阅读
针对基于能量准则的板翅式换热器封头强度设计问题,给出了比率塑性功曲率(Ratio Plastic WorkCurvature,RPWC)准则塑性载荷和塑性功曲率(Plastic Work Curvature,PWC)准则塑性载荷确定方法。两种准则的封头塑性压力结果一致表明大变形效应对封头结构有强化效果。5种接管开孔率的塑性压力比较结果表明,PWC塑性压力最大,RPWC塑性压力其次,PWC工程塑性压力最小,RPWC塑性压力对应的比率塑性功小于PWC零曲率塑性载荷对应的比率塑性功。RPWC准则相对PWC零曲率准则临界塑性指标更严格,具有偏安全、简便直观的特点,适合板翅式换热器封头这类复杂结构的塑性压力计算,而PWC工程塑性载荷可用于工程设计载荷的保守估计。
In order to solve the design problem of head strength of plate-fin heat exchangers based on energy criterion, the criteria of Plastic Plasticity Curvature (Plastic Work Curvature, PWC) plasticity determination method are given for Ratio Plastic WorkCurvature (RPWC) . The plastic pressure of the head of the two criteria consistently shows that the large deformation effect has an enhanced effect on the head structure. The results of plastic pressure comparison show that PWC plastic pressure is the largest, RPWC plastic pressure is the second, PWC engineering plastic pressure is the smallest, RPWC plastic pressure corresponding plasticity work is less than PWC zero plasticity corresponding plasticity plastic work. RPWC criterion relative to the PWC zero curvature criterion critical plasticity more stringent, with partial safety, simple and intuitive features, suitable for plate-fin heat exchanger head such complex structure of the plastic pressure calculation, and PWC engineering plastic load can be used for engineering design load Conservative estimates.