Badanie procesu degradacji wysokoobciążonego połączenia metal-kompozyt polimerowy w procesie eksploatacji

Kamila Kustroń

Abstract

The subject of research was an influence of a thermal field on the fatigue process of structural designs made from metal and polymeric composite. Specimens based on a dynamic fastener used in the wing - fuselage joint of the PW-5 and PW-6 gliders. The investigations were divided into two types. First type was using thermovisional technique and second one based on thermocouples. A steady thermal field was in environmental temperature (T(sub)0 equal 26°C) and the unsteady thermal field was obtained raising the temperature to 40°C using an ultra-thermostat and investigating behavior of me structure during the process with heat flux between the environmental temperature and the temperature of the healed specimen. Loads had different levels of an amplitude and frequency. Data sets let to assess an influence of unsteady thermal field in quantitative way in the thermovisional experiments and qualitative way in the experiments with thermocouples. There was recorded significant increase of the temperature during failure of the test piece. One can notice two aspects of a frictional process. First cause is the friction on contact surface between metal and composite and second one is an intrastructural friction in the same structure of composite. The increase of temperature depends on a previous load and heat flux that influences the investigating element. The main goal s of doctor's thesis was describing the thermodynamic bases of the degradation process. In the paper an original method is demonstrated for analysis of a degradation process. A new mathematical degradation model of the metal-polimeric composite high—loaded joints applied into gliders have been presented. The cause-effect conditions of the degradation are analysed from the reliability point of view. An expression of the durability, reliability and safety is presented as a common methodology. The algorithm model is optimisied with regard to the degradability coefficient. The process of the degradation has been seen as a progress under the influence of stochastic loads and stochastic destructive interactions of an environment.
Diploma typeDoctor of Philosophy
Author Kamila Kustroń (FPAE / IAAM)
Kamila Kustroń,,
- The Institute of Aeronautics and Applied Mechanics
Title in PolishBadanie procesu degradacji wysokoobciążonego połączenia metal-kompozyt polimerowy w procesie eksploatacji
Languagepl polski
Certifying UnitFaculty of Power and Aeronautical Engineering (FPAE)
Disciplinemechanical engineering / (technology domain) / (technological sciences)
Defense Date25-06-2001
Supervisor Jerzy Lewitowicz (FPAE / IAAM)
Jerzy Lewitowicz,,
- The Institute of Aeronautics and Applied Mechanics

Pages150
Keywords in Polishdiagnostyka techniczna, połączenia, metale, materiały kompozytowe polimerowe, badania zmęczeniowe materiałów
Abstract in EnglishThe subject of research was an influence of a thermal field on the fatigue process of structural designs made from metal and polymeric composite. Specimens based on a dynamic fastener used in the wing - fuselage joint of the PW-5 and PW-6 gliders. The investigations were divided into two types. First type was using thermovisional technique and second one based on thermocouples. A steady thermal field was in environmental temperature (T(sub)0 equal 26°C) and the unsteady thermal field was obtained raising the temperature to 40°C using an ultra-thermostat and investigating behavior of me structure during the process with heat flux between the environmental temperature and the temperature of the healed specimen. Loads had different levels of an amplitude and frequency. Data sets let to assess an influence of unsteady thermal field in quantitative way in the thermovisional experiments and qualitative way in the experiments with thermocouples. There was recorded significant increase of the temperature during failure of the test piece. One can notice two aspects of a frictional process. First cause is the friction on contact surface between metal and composite and second one is an intrastructural friction in the same structure of composite. The increase of temperature depends on a previous load and heat flux that influences the investigating element. The main goal s of doctor's thesis was describing the thermodynamic bases of the degradation process. In the paper an original method is demonstrated for analysis of a degradation process. A new mathematical degradation model of the metal-polimeric composite high—loaded joints applied into gliders have been presented. The cause-effect conditions of the degradation are analysed from the reliability point of view. An expression of the durability, reliability and safety is presented as a common methodology. The algorithm model is optimisied with regard to the degradability coefficient. The process of the degradation has been seen as a progress under the influence of stochastic loads and stochastic destructive interactions of an environment.
Thesis file
Kustron_Kamila_badanie.pdf 10.15 MB
Citation count*4 (2015-07-23)

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