U. Chandra, G. Barot, A. Chandra, Modern Computational Technologies, Inc., Cincinnati, OH; K. M. B. Taminger, NASA Langley Research Center, Hampton, VA; J. K. Watson, NASA Johnson Space Center, Houston, TX
This presentation discusses the application of the finite element method for the prediction of residual stresses and distortions in components made by the electron beam freeform fabrication (EBF
3) process. Comparison of the computed values of residual stresses with their experimental counterparts is also included.
Three test specimens with varying levels of complexity were fabricated using the EBF3 process. Specimen 1 was a 6”x3”x1/4” plate and the material was deposited along one of its 6” long edge in a number of thin layers. Specimen 2 was in the form of a circular disc formed on a plate type substrate. Specimen 3 involved three adjacent straight lines of deposit each consisting of several layers of material. A commercial finite element code, ABAQUS - supplemented with a special user subroutine to model the heat source, was used for simulations. A combination of X-ray diffraction and incremental ring core techniques was used for stress measurement.
The presentation also highlights some of the challenges experienced during the fabrication of test specimens, their finite element simulation and experimental validation.
This presentation discusses the application of the finite element method for the prediction of residual stresses and distortions in components made by the electron beam freeform fabrication (EBF3) process. Comparison of the computed values of residual stresses with their experimental counterparts is also included.
Three test specimens with varying levels of complexity were fabricated using the EBF3 process.
Specimen 1 was a 6”x3”x1/4” plate and the material was deposited along one of its 6” long edge in a number of thin layers. Specimen 2 was in the form of a circular disc formed on a plate type substrate. Specimen 3 involved three adjacent straight lines of deposit each consisting of several layers of material. A commercial finite element code, ABAQUS - supplemented with a special user subroutine to model the heat source, was used for simulations. A combination of X-ray diffraction and incremental ring core techniques was used for stress measurement.
The presentation also highlights some of the challenges experienced during the fabrication of test specimens, their finite element simulation and experimental validation.
