NUMERICAL SIMULATION OF IMPACT LOADING ON ELASTIC SPACE STRUCTURE AND CASE STUDIES
- Paper number
IAC-08.C2.6.1
- Author
Prof. Harijono Djojodihardjo, Universitas Al Azhar Indonesia, Indonesia
- Year
2008
- Abstract
Impact of a foreign object on structures is a relevant problem in a large host of engineering applications, including space structures. It is with such motivation that the fundamental problem of impact of a relatively rigid body of small size to a solid elastic surface will be reviewed and studied analytically, to gain in-depth understanding on some critical effects to the structure. The objective of the present study will be focused on the deformation and stress distribution on the impacted structure due to the impact loading which will lead to structural integrity and dynamic stability problems, and develop effective computational procedure for assessing such problem. Computational procedure are developed for the evaluation of the deformation and stresses in various generic cases, covering various generic cases beams and shell structures, and establish its validity and robustness. Generic cases investigated include: Elastic and plastic behaviour of material by identifying the fully elastic, elastic-plastic, and fully plastic situations; collapse load for beams; Airy Stress Function distribution of the cross section under concentrated load acting on a simply supported beam using Elementary Beam Theory and a series of approximations, which are compared to well known exact solution of Timoshenko and Goodier; Comparison of the deflection and stress distribution of centrally-loaded beam using analytical and Finite Element Method; Stresses distribution along a beam induced by point load on midspan following Boussinesq’s Point Load Theory and Timoshenko’s Theory, and Surface stresses and displacement distribution due to sphere indenter impact on beam based on Hertz Contact Theory. Resulting stresses investigated include vertical normal stresses, radial normal stresses, tangential normal stresses, shear stresses and principle stresses. The computation results are visualized for better and comprehensive assessment. In all these examples impact loading has been approached using static equivalence using energy principles. Attention is then focused to the impact of a relatively rigid body to beam and shell configurations representative of space structure, which are also be carried out using finite element approach. Results from finite element computational approach using developed MATLAB ® based computational program, which is validated by comparison with analytical and other commercially available finite element software for classical solutions, are discussed References: 1. Guowei Ma, Yumin Liu and Qingming Li, Numerical Simulations of Dynamic Instability of Elastic-Plastic Beams, JOURNAL OF ENGINEERING MECHANICS © ASCE , MARCH 2006. pp 260-267 2. Ji-Lin Yu And Norman Jones, Numerical Simulation Of Impact Loaded Steel Beams And The Failure Criteria, Intr.J.Solids StructuresVol.34,No.30, pp 3977-4004, 1997, 0 1997 Elsevier Science Ltd- Abstract document
- Manuscript document
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