EXPERIMENTAL AND NUMERICAL MODELING OF BUCKLING INSTABILITY OF

EXPERIMENTAL AND NUMERICAL MODELING OF BUCKLING INSTABILITY OF LASER SHEET FORMING Authors: Z. Hu , R. Kovacevic , M. Labudovic RICH DEWEY Sept. 21, 2009

Introduction: Function of Paper �To discuss the buckling instability that can happen when laser bending sheet metal. �Present data from a series of experiments and compare them to data from 3 -D FEM(finite element modeling) simulation.

Introduction: Why Important? �Laser bending of sheet metal is becoming very proper in precision manufacturing. �Over 25 different variables have been identified that impact the end result, making computer simulation very difficult. �Author selects a very specific method of laser bending and is able to produce similar results with his simulation.

Introduction: References (1)

Introduction: References (2)

Background

Background: CNC Laser Cuttters/Benders

Selected Method: Buckling

Models and Design Application �Technical Application to Course

Models and Design Application �Governing equations/parameters used to set up the FEM simulation:

Models and Design Application �FEM Model

Results: Experimental Equipment

Results: Data Tables

Results: Data Tables �FEM model results vs experimental results

Results: Data Tables �Example of wide range of experimental results

Conclusions: �“A 3 -D FEM simulation system has been developed that includes a nonlinear transient indirect coupled thermal-structural analysis accounting for geometric and material nonlinearities. The buckling deformation, the bending angle, the distribution of stress-strain, the temperature, and residual stress can all be obtained by computer simulation. ”

Conclusions: �Practical Industrial use? �Model not flexible enough to be used in a variety of situations �Technical advancement? �Helpful, step in the right direction �Industries most impacted? �Any high presicion sheet metal forming or bending, most electronics manufacturers.

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