2010 AIAA SDM student symposium concurrent structural prognosis under random loading

Jingjing He, Zizi Lu, Yongming Liu

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

Abstract

There is a growing interest in developing affordable structural prognostic systems. Fatigue, as one of the damage modes in aircraft and civil structures, is of critical importance for the structural health management and is still a challenging problem despite extensive progresses during the last few decades. Traditional fatigue prognosis methods are cyclebased which introduces some complexities in the fatigue prognosis. It requires cycle counting techniques to transform the direct stress history to cycle history before the fatigue damage prognosis can be performed, which makes it impossible to perform the concurrent fatigue damage prognosis at the structural level. The current focus is on the fatigue prognosis coupled with structural dynamics using the state-space model. A new methodology for concurrent multi-scale fatigue damage prognosis is proposed in this paper to solve the problem mentioned above. The proposed methodology is based on a small time scale formulation of fatigue damage and is not cycle-based, which is fundamentally different from the traditional methods. The proposed fatigue model can be expressed as a set of first order differential equations. The state-space method is employed to solve the structural dynamic response and fatigue crack growth concurrently. Following this, the structural fatigue life prognosis can be performed. Numerical examples with single degree-of-freedom (SDOF) and multiple degree-of-freedom (MDOF) under random loading are demonstrated using the proposed methodology. The proposed methodology is validated by experimental data under variable amplitude loadings. A good agreement between prognosis results and experimental data is observed.

Original languageEnglish (US)
Title of host publication51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
StatePublished - Dec 16 2010
Externally publishedYes
Event51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Orlando, FL, United States
Duration: Apr 12 2010Apr 15 2010

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
ISSN (Print)0273-4508

Other

Other51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityOrlando, FL
Period4/12/104/15/10

ASJC Scopus subject areas

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    He, J., Lu, Z., & Liu, Y. (2010). 2010 AIAA SDM student symposium concurrent structural prognosis under random loading. In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference [2010-2626] (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).