Stress Analysis And Fatigue Life Of Welding Layrer In Thermoelectric Generator At High Temperature

With the increasing level of human life, there is a high demand for modernization,environmental degradation and energy crisis have become urgent problems to be solved,so the effective use of resources becomes the focus. The effective use of production ofheat in life and waste heat and green energy have become particularly important, thethermoelectric power generation technology uses thermoelectric effect to have heat effectcan be directly converted to electrical energy.Chinese research in thermoelectric refrigeration applications is more mature, but therate of thermoelectric electricity generation is in relatively slow progress. Thermoelectricpower generation of research in china focuses on the thermoelectric material, the aim is toimprove the figure of merit in order to optimize the power generation performance, andfor the complete structure of the thermoelectric generator of thermoelectric research is notyet in-depth, according to the actual structure of the thermoelectric generator buildthermoelectric model for numerical analysis. In thermoelectric monomer component, thesolder layer not only plays a role in connection, but also have good thermal conductivityand electric conductivity, so the solder layer portion of a thermoelectric generatorbecomes a important part, its stress field distribution and longevity are measure ofperformance quality.This paper is based on the basic theory of thermoelectric power generationtechnology and fully investigated the thermoelectric nature of the work, thermoelectricmonomer as the research object, mainly to complete the following basic tasks:(1) With the fully understand of the working principle and nature of thethermoelectric generator, we build a numerical model with a variety of variable geometryboundary conditions based on the structural characteristics, to determine the materials ofthe various components of thermoelectric power monomer and related materialcharacteristics, in order to ensure the normal operation of the thermoelectric monomer.(2) Using the finite element analysis software ANSYS Workbench to establish athermoelectric finite element model of the monomer and conducted thermoelectric coupling analysis and transient structural analysis, and have completed the analysis ofgalvanic arm length change and temperature difference between the hot and cold sidechanges and the shape of the arm changes in thermoelectric power generation performanceof the thermoelectric conversion of monomers and the solder layer on the distribution ofthe stress field, so to analyze the different external conditions of the case on themonomers, and analyze the distribution of the maximum stress and stress difference also.(3) According thermoelectric normal working hours of the parameters to determinethe mechanism of fatigue analysis, and with the application of FE-SAFE software, thefatigue life analysis of thermoelectric monomer layer of solder have at different externalconditions numerical analysis, to determine the larger external condition in the longervalue of the fatigue life and to study the factors influencing lifetime value.