EXPERIMENTAL AND NUMERICAL MODELING OF BUCKLING INSTABILITY

OF LASER SHEET FORMINGAuthors: Z. Hu , R. Kovacevic , M. Labudovic

RICH DEWEYSept. 21, 2009

Introduction: Function of PaperTo 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 ApplicationTechnical Application to Course

Models and Design ApplicationGoverning equations/parameters used to set

up the FEM simulation:

Models and Design ApplicationFEM Model

Results: Experimental Equipment

Results: Data Tables

Results: Data TablesFEM model results vs experimental results

Results: Data TablesExample 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.

Article Quality: Keep it