The Effect of Loading Parameters on Fatigue of Composite Laminates: Part IV Information Systems

Abstract

Damage tolerance, damage resistance and durability assessments of aircraft composite structures are essential components of certification. The certification procedure requires lengthy experimental validation of those assessments, although much research has been conducted to understand the behavior of polymer matrix composites under service conditions. A fair amount of data is available together with a number of analytical models in these areas of research. However, because of the vast number of parameters involved, a generic model is rather difficult to develop. The ultimate goal of this study is the identification of design parameters to be used in the development of information system tools that can help engineers synthesize different sets of data efficiently. In the information system developed in the current work for structural behavior with damage, all parameters that have been studied are available for the user to choose as input. The output contains design parameters such as compression strength after impact, dent depth, and damage area as well as literature references, raw data, tables, and plots. The information system is constituted in a relational database environment and tools from expert system technology are incorporated so that low confidence input can be captured and flexibility can be maintained in similarity assessments. With this system it is also possible to conduct parametric studies to determine the effect of each design parameter or a combination of parameters on the damage behavior. Case examples are included to demonstrate practical uses of the information system for both data retrieval and similarity studies. A similar system was developed for fatigue design of composites. Design parameters were identified as well as the values these parameters can take. Results of the parameter identification study have been used to create a conceptual data model.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2000
Accession Number
ADA389998

Entities

People

  • H. T. Hahn
  • Ozgur Turkgenc

Organizations

  • University of California, Los Angeles

Tags

Communities of Interest

  • Air Platforms
  • Engineered Resilient Systems
  • Space

DTIC Thesaurus Topics

  • Artificial Intelligence
  • Composite Material Fabrication
  • Composite Materials
  • Computer Programming
  • Computers
  • Database Management Systems
  • Information Systems
  • Laminates
  • Material Degradation Processes
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Polymer Matrix Composites
  • Tensile Strength
  • Test And Evaluation
  • Test Methods

Readers

  • Computational Modeling and Simulation
  • Database Systems and Applications
  • Reinforced Composite Materials

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference