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Measurement of ductile fracture evolution in sheet metal forming
Last modified: 2013-06-28
Abstract
The present work aims to develop a method for evaluating the strain field of an object, mainly a
sheet metal, up to the very edge of an eventual discontinuity in its surface. The study originates from the need
of measuring the strains in sheet metals that underwent stamping process or Nakazima tests, where cracks
occurred. In such cases, the investigation method typically used, that is the optical grid method, is likely to fail
just where more interesting data could be captured, because of the discontinuity in the surface. From this
starting point, authors borrowed and modified the XFEM approach, where enriched shape functions are used
to describe the internal displacement fields of finite elements.
sheet metal, up to the very edge of an eventual discontinuity in its surface. The study originates from the need
of measuring the strains in sheet metals that underwent stamping process or Nakazima tests, where cracks
occurred. In such cases, the investigation method typically used, that is the optical grid method, is likely to fail
just where more interesting data could be captured, because of the discontinuity in the surface. From this
starting point, authors borrowed and modified the XFEM approach, where enriched shape functions are used
to describe the internal displacement fields of finite elements.
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