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  4. A method to predict residual strength and fatigue life of impact damaged carbon/epoxy laminates
 
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1990
Conference Paper
Title

A method to predict residual strength and fatigue life of impact damaged carbon/epoxy laminates

Abstract
Nonvisible impact damage reduces static and residual strength of cfrp-composite structures. Fatigue loading of impacted laminates in compression causes damage growth. The stress condition that inflicts the degradation is generated by the buckling deflection. Observed phenomena were utilized to conceive a method for the analytical prediction of compressive strength of composite structure after impact and after impact and fatigue. The draft of such a prediction method uses laminate plate theory, stability theory and linear elastic fracture mechanic. Necessary input data such as material strength properties and stiffness reduction curves (indicating damage growth) require only standard testing. A three dimensional damage model and a formula describing the typical relation between delamination growth and increase in compliance measured during fatigue are subjects of continued research.
Author(s)
Gerharz, J.J.
Idelberger, H.
Mainwork
Durability of Polymer Based Composite Systems for Structural Applications  
Conference
Durability of Polymer Based Composite Systems for Structural Applications 1990  
Language
English
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Keyword(s)
  • Bruchmechanik

  • carbon fibre reinforced plastic

  • composite structure

  • damage

  • fatigue life estimation

  • fracture mechanic

  • impact loading

  • Kohlenstoffaserverstärkter Kunststoff

  • laminat

  • laminate

  • Lebensdauerabschätzung

  • residual strength

  • Restfestigkeit

  • Schädigung

  • Stoßbeanspruchung

  • Verbundkonstruktion

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