### 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 δ_{1} are investigated. From this study, it is found that the peak stress δ_{1} can be expressed as δ_{1}/E ≃ f(t/R, (∂δ/∂ε)δ= δ_{1}/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 (∂δ/∂ε)δ=δ_{1} is the stress gradient at δ = δ_{1}. Based on this fact, one can estimate the stress δ_{1} for the power law hardening material from the results of δ_{1} for the material with the strain-hardening portion of stress-strain curve being a straight line.

Original language | English |
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Pages (from-to) | 1695-1702 |

Number of pages | 8 |

Journal | Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A |

Volume | 70 |

Issue number | 12 |

Publication status | Published - 1 Dec 2004 |

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### Keywords

- Axial Collapse
- Buckling
- Circular Tubes
- FEM
- Finite Deformation Theory
- Plasticity

### Cite this

*Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A*,

*70*(12), 1695-1702.