Creep buckling of viscoelastic beams modeled using anelastic displacement fields

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Many aerospace structures must operate under combined mechanical and thermal loads. In particular, thin-walled structural members (beams, plates, shells) may carry significant compressive loads while resisting lateral loads in the presence of high and changing temperatures. Structural stability and creep are general concerns under such conditions, especially for polymers and polymer-matrix composites, which have relatively high coefficients of thermal expansion and which may exhibit viscoelastic behavior. The longterm development of structural instability under prolonged high temperature exposure adds potential time-dependent failure modes. The paper describes the application of an internalvariable viscoelastic model to the problem of creep buckling of a simply-supported beam with initial curvature. When the axial compressive load is less than the “rubbery” buckling load (based on the long-time elastic modulus), the response exhibits decaying exponential creep and asymptotically approaches an equilibrium deflected state. When the load exceeds the “glassy” buckling load (based on the short-time modulus), rapid buckling occurs, resisted only by damping and inertia. At intermediate loads, the response grows, eventually resulting in a creep instability. The apparent creep time constant appears to increase with increasing compressive load.

Original languageEnglish (US)
Title of host publication56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624103421
StatePublished - Jan 1 2015
Event56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2015 - Kissimmee, United States
Duration: Jan 5 2015Jan 9 2015

Publication series

Name56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Other

Other56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2015
CountryUnited States
CityKissimmee
Period1/5/151/9/15

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Architecture
  • Mechanics of Materials
  • Building and Construction

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    Lesieutre, G. A. (2015). Creep buckling of viscoelastic beams modeled using anelastic displacement fields. In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference). American Institute of Aeronautics and Astronautics Inc..