Failure analysis of blast loaded ductile beam

A failure analysis procedure based on the elastic-plastic finite element analysis of the higher order beam is presented to predict the mode II and III failure of impulsively loaded ductile clamped beams. The variational equation of motion of the problem is first obtained by using the principle o...

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Main Author: Luo, Qing
Format: Others
Language:English
Published: 2009
Online Access:http://hdl.handle.net/2429/5421
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spelling ndltd-UBC-oai-circle.library.ubc.ca-2429-54212018-01-05T17:32:34Z Failure analysis of blast loaded ductile beam Luo, Qing A failure analysis procedure based on the elastic-plastic finite element analysis of the higher order beam is presented to predict the mode II and III failure of impulsively loaded ductile clamped beams. The variational equation of motion of the problem is first obtained by using the principle of virtual work and the Total Lagrangian Approach together with the kinematics of the higher order beam theory and the nonlinear strain-displacement relation. The Finite Element Method is employed to discretize the beam spatially initiating the numerical solution procedure. The constitutive model considers elastic-plastic isotropic strain hardening by von Mises yield criterion and associated flow rule and strain rate sensitivity by Cowper-Symonds relationship. Equations of motion are integrated by central difference method in the time domain. Based on the finite element simulation, two failure criteria are proposed. In the interaction failure criteria, contributions from tensile tearing and transverse shearing to the damage of the beam are considered by including tensile strain ratio and shear stress ratio in the criteria. Both linear and quadratic models are investigated. The beam is modelled as an elastic-plastic beam with a plastic hinge at each support to calculate the total strain at the support. The shear stress comes either from the wall reaction obtained from equilibrium or directly from the finite element analysis of the higher order beam theory. In the sectional plastic work density criterion, the beam is assumed not to fail until the sectional plastic work density exceeds the critical value. Post failure analysis is also included to take account of the residual energy of the beam at failure. Numerical simulations have been carried out for the experiments of blast loaded beams. Comparison with the experimental results suggests the quadratic interaction criteria is suitable for this type of analysis. Applied Science, Faculty of Civil Engineering, Department of Graduate 2009-03-03T23:10:02Z 2009-03-03T23:10:02Z 1994 1994-11 Text Thesis/Dissertation http://hdl.handle.net/2429/5421 eng For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. 2959692 bytes application/pdf
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language English
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description A failure analysis procedure based on the elastic-plastic finite element analysis of the higher order beam is presented to predict the mode II and III failure of impulsively loaded ductile clamped beams. The variational equation of motion of the problem is first obtained by using the principle of virtual work and the Total Lagrangian Approach together with the kinematics of the higher order beam theory and the nonlinear strain-displacement relation. The Finite Element Method is employed to discretize the beam spatially initiating the numerical solution procedure. The constitutive model considers elastic-plastic isotropic strain hardening by von Mises yield criterion and associated flow rule and strain rate sensitivity by Cowper-Symonds relationship. Equations of motion are integrated by central difference method in the time domain. Based on the finite element simulation, two failure criteria are proposed. In the interaction failure criteria, contributions from tensile tearing and transverse shearing to the damage of the beam are considered by including tensile strain ratio and shear stress ratio in the criteria. Both linear and quadratic models are investigated. The beam is modelled as an elastic-plastic beam with a plastic hinge at each support to calculate the total strain at the support. The shear stress comes either from the wall reaction obtained from equilibrium or directly from the finite element analysis of the higher order beam theory. In the sectional plastic work density criterion, the beam is assumed not to fail until the sectional plastic work density exceeds the critical value. Post failure analysis is also included to take account of the residual energy of the beam at failure. Numerical simulations have been carried out for the experiments of blast loaded beams. Comparison with the experimental results suggests the quadratic interaction criteria is suitable for this type of analysis. === Applied Science, Faculty of === Civil Engineering, Department of === Graduate
author Luo, Qing
spellingShingle Luo, Qing
Failure analysis of blast loaded ductile beam
author_facet Luo, Qing
author_sort Luo, Qing
title Failure analysis of blast loaded ductile beam
title_short Failure analysis of blast loaded ductile beam
title_full Failure analysis of blast loaded ductile beam
title_fullStr Failure analysis of blast loaded ductile beam
title_full_unstemmed Failure analysis of blast loaded ductile beam
title_sort failure analysis of blast loaded ductile beam
publishDate 2009
url http://hdl.handle.net/2429/5421
work_keys_str_mv AT luoqing failureanalysisofblastloadedductilebeam
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