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New Materials for Next-Generation Commercial Transports (1996) / Chapter Skim
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6 Methodologies for Assessment of Structural Performance
Pages 49-56

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From page 49...
... Ill Analytical Methods
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From page 51...
... In spite of over 60 years of experience by researchers and industry in designing metallic structure and 25 years of experience designing composite structure, the lack of naorous analytical methods to predict residual strength and fatigue life can inhibit the cost-effective introduction of advanced materials with superior specific strength and stiffness relative to 51 current conventional materials. Continuing, efforts are needed to develop-and insert into standard engineering practiceadvanced mechanics-based analytical prediction methodologies that would allow innovative designs to be evaluated and optimized at acceptable cost.
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From page 52...
... Stiffened shell analysis methods should include automated, adaptive remeshing capability, as well as a capability to analyze structures with nonlinear materials properties and at large deformations. These improved methods should be integrated into the structural analysis methodology to predict fatigue crack growth and residual strength of aircraft structures.
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From page 53...
... Progress has been made developing damage onset criteria, particularly for those special cases where an individual damage mechanism can be isolated, but three-dimensional models of the material system may be required to predict the correct local stresses to use in the criteria. This results in a massive computational process involving an iterative and incremental loading scheme and may require a very refined finite element mesh with many degrees of freedom.
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From page 54...
... The three-dimensional behavior of composite materials is well suited to global, local, and hierarchical methods of analysis. New methods can efficiently couple local matenal-level damage mechanisms to global responses, such as load redistribution, geometric nonlinear and instability phenomena, and predict structural failure modes.
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From page 55...
... For composite structure, complex failure modes that may involve the interaction of several different damage mechanisms are major design considerations when addressing durability and damage tolerance requirements. There are several key technical barriers to developing reliable methods to predict failure of composite structure, including incomplete understanding of complex three-dimensional stress states, damage progression laws, processing residual stresses, and understanding of failure mechanisms and associated failure criteria.
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Key Terms

  • damage tolerance
  • residual strength
  • structural analysis
  • composite structure
  • fracture mechanics

  • crack growth
  • fatigue crack
  • analysis methods
  • damage mechanisms
  • fatigue life

  • structural integrity
  • structural design
  • remaining strength
  • analysis methodology
  • structural failure

  • reliable methods
  • aircraft structures
  • analytical techniques
  • analytical prediction
  • tolerance requirements

  • prediction methodology
  • individual damage
  • analytical methods
  • test data
  • composite materials

  • developing reliable
  • efforts require
  • technical barriers
  • failure characteristics
  • major design


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