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Development of plastic strain equalization method for a crash analysis
Technical Paper
2000-05-0198
Sector:
Language:
English
Abstract
For a crash analysis using FEM with respect to a structure that
is composed of thin plates, we developed a new structure study
method (plastic strain equalization method). This method defines
the optimality criteria as in the linear analysis of a fully
stressed design and indirectly finds an optimal solution.
We assume that a structure with both a lightweight and high
collapse load should have sufficient strength corresponding to
impact loads in each area. This means that at any area the load
value and the strength are balanced at a certain value. For the
criteria that the plastic strain value is equal over the whole
area, a solution can be found by repeating computations. The design
variable is the thickness of shell elements and the computation is
iterated until plastic strain values are almost equal.
In this paper, a structure with both a lightweight and a high
collapse load could be optimized by equalizing the plastic strain
value. And the application results by means of this method are
described.