Abstract
In this paper, the elastoplastic nonlinear behavior of circular tubes subjected to statical axial compression is studied by using finite element method. In order to estimate the performance of compressive energy absorbtion for circular tubes, the effects of material and geometrical properties on first peak compressive stress o are investigated. From this study, it is found that the peak stressσ1 can be expressed as σ1/E≅f (t/R, (∂σ/∂e) σ=σ1/E), regardless of the stress-strain formulations. Here, t is the thickness, R is the radius of a tube, E is Young's modulus and (∂σ/∂e) σ=σ1 is the stress gradient at σ=σ1. Based on this fact, one can estimate the stress σ1 for the power law hardening material from the results of al for the material with the strain-hardening portion of stress-strain curve being a straight line.
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