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Modeling of Damages such as Crack, Inclusions and Areas with Variable Properties in Composite and Metal Structures and then Prediction and Extension of their Life

Razavi, Reza | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45142 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Abedian, Ali
  7. Abstract:
  8. Nowadays, some of the major problems of the airplane industry is that airplanes’ fleet are approaching to the end of their defined life, inability to buy new planes and obtaining aircraft’s parts for repairing process. Therefore, in order to increase the life of the aging aircrafts, some essential process such as modeling processes, identify principal structure elements to strengthen and repair them should be done to all these airplanes, all these processes refer as aging process. Aging programs initiated in some countries, such as America, Australia, Britain and Canada from about thirty-five years ago, technological approaches inventing new ways to start repairing worn metallic structures that recently continued more seriously and organized. In recent years, many other countries' macroeconomic planners give greater importance to aging programs to maintain their national capital and keep their airplane’s fleet. In the present thesis the principal structural elements of aircraft’s wing identified and the effect of cracks or areas with reduced mechanical properties are studied on the behavior of the principal elements. This study is important because its results can be applied to study of the effect of aging on the structural behavior under different loads. Thus, the presence of cracks and areas with reduced mechanical properties in the principal members are studied, and their effects on the potential reduction in load-bearing structures are also examined
  9. Keywords:
  10. Critical Component ; Crack Modeling ; Mechanical Properties ; Structure's Aginy ; Modeling Areas With Reduced ; Life Prediction

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