Determination of Boundary Conditions

Contact

Name

Jürgen Nietsch

Academic Staff

Phone

work
+49 241 80 95908

Email

E-Mail
 
Strategy: multi-stage concept for determination of boundary conditions Copyright: IBF
 
 

For the determination of the process boundary conditions, a multi-stage concept was developed at the Institute of Metal Forming. This concept ensures the distinct determination of the single parameters. The corresponding boundary conditions such as emissivity factor, heat transfer coefficient and friction coefficient are determined by using an inverse FEA calculation. The procedure is as follows:

Determination of the Emissivity Factor ε

  • Cooling of a cylindrical specimen with air in combination with temperature measurement
  • Comparison of the specimen’s temperature with FEA calculation

Determination of the Heat Transfer Coefficient α

  • Cooling of a specimen at defined contact pressure combined with temperature measurement
  • Comparison of the specimen’s temperature with FEA calculation

Determination of the Friction Coefficient μ

  • Compression of a conic upsetting specimen or alternatively a ring shaped upsetting specimen

  • Comparison of the specimen’s diameter with FEA calculation or nomogram