Strain test and plastic pressure of the platefin heat exchanger header

ZHANG Xu1, ZOU Xian-ping2

(1.Institute of Technology, Zunyi Normal College, Zunyi 563002, China;
2.Gree Electric Application Inc.of Zhuhai, Zhuhai 519070, China)

Abstract: Aiming at investigating the strength design of the platefin heat exchanger header , the header with radial nozzles under internal pressure was studied by means of the finite element analysis(FEA) and resistance strain gauge. The calculation methods plastic pressure based on ratio plastic work curvature (RPWC) criterion, plastic work curvature (PWC) criterion and zero curvature (ZC) criterion were presented. The results indicate that the test results of strain validate the correctness of finite element modeling method. The consistency of test results and finite element analysis results shows the correctness of finite element modeling method.The plastic pressure results indicate that dimensional parameters affect the plastic pressure.RPWC criterion is simpler and more intuitive than the PWC and ZC criterion. The plastic pressure fitting formula of RPWC criterion for header is reasonable, which can provide beneficial guideline for calculating the plastic pressure and selecting dimensional parameters in designing the platefin heat exchanger header with radial nozzle.

Key words: curvature criterion; plastic pressure; parametric study; experimental study; formula fitting