Dynamic fracture behaviour of high strength steels
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- Tez No: 543150
- Danışmanlar: Dr. EVA SCHMIDOVA
- Tez Türü: Doktora
- Konular: Bilim ve Teknoloji, Ulaşım, Science and Technology, Transportation
- Anahtar Kelimeler: Fracture mechanics, plane strain fracture toughness, dynamic fracture toughness, impact tensile test, fatigue crack growth rate, high strength steel, railway, rail vehicle
- Yıl: 2018
- Dil: İngilizce
- Üniversite: University of Pardubice
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 172
Özet
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Özet (Çeviri)
In accordance with the current trend towards the lightweight railway transport means, this dissertation work is focused on the use of advanced high-strength steels. Their mechanical response is based on specific material and technology processes. Application of steels with improved strength generally means increased sensitivity to internal defects, together with increased requirements for precise determination of all material parameters. Hence the investigation through fracture mechanics aspects is an inevitable precondition for the reliable and optimized design of railway structural parts. In this dissertation work, the experimental analyzes of fracture behavior in connection with structural evaluation were conducted. The plane strain fracture toughness (KIC) of Strenx 700MC steel compared to standardly used S355 steel in rail vehicles were determined with two different nonstandardized test methods. The new methodology for evaluation of dynamic response at different loading rates near to crash conditions was used and validated in the experimental part of the work. In order to specify the dynamic fracture toughness (KId) value, uniaxial impact tensile tests and three-point dynamic fracture tests were performed and evaluated with emphasis on crack propagation mode. Vehicle crashworthiness of high strength steel is greatly influenced by the welded joints because of high energy input during welding. The microstructural changes during the experimental welding process were analyzed and hardness measurements were performed. According to identified critical changes and considering used welding parameters, the weld thermal cycle simulation was applied to Strenx 700MC specimen to evaluate the effect of heat input on fracture behaviour at static and dynamic loading conditions. Lastly, in order to find out the fracture mode depending loading conditions of tested steels, fractography analysis was performed using scanning electron microscopy (SEM).
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