Strength evaluation of alumina spray coating (1st report, proposal for the control method of residual stresses)

In a spray process, it is comfirmed that a temperature of generation of residual stresses has to be clarified for mechanism in generation of residual stresses. But a mechanism of the temperature is largely-unexplored. Therefore, it's hard to say that it is clear up how important stresses of first stage are generated in a spray process. So in this report an estimation approach of residual stresses is proposed through the viewpoint of energy consumption. By measurements of a surface temperature, a base temperature and residual stresses for 1 sample, a parameter for presuming a temperature of generation of residual stresses is clear up. And residual stresses of other samples are presumed reasonably with the finite element analysis of thermal stress and the parameter. Accordingly, it is clear up that the proposed estimation approach is reasonable. Based on the estimation approach, the control approach of residual stresses is established. In this report a result of control of residual stresses with the control approach is shown. In addition, flowchart for control of residual stresses in product is presented. Accordingly, the residual stress can be controlled reasonably. The control approach of residual stresses is conductive to an advantage that give to user. And the control approach shows that it is important to control of the optimal residual stresses in use environment.