Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura
Investigation of fatigue life in superalloys structural components
Апстракт
The researches in the field of fatigue failure are mainly aimed at identifying the factors which determine the fatigue behavior of the structural components and their inter relations. It is known that the fatigue resistance of structures is influenced mostly by load sequences, combinations of load types, as well as by materials and their fatigue properties. Therefore, the fatigue life cannot be determined without a thorough analysis of these parameters. Materials known as superalloys exhibit excellent mechanical strength and considerable creep resistance, especially at high temperatures. However, a critical property of these alloys is their resistance to fatigue-crack propagation, particularly at service temperatures. Besides, their fatigue features are not as easily accessible as of other materials (aluminum or steel, for instance). Consequently, determining the fatigue life in superalloy structures is not an easy task to accomplish. Taking into consideration the superalloy properties... set in the NASGRO database, this thesis has explored the fatigue life of the real structural components, considering – at the same time – the stresses of both constant and variable amplitudes. The structural components have been designed in the CATIA v5, whereas the propagations of the 2D and 3D fatigue cracks through the structure have been simulated afterwards by the application of the FEM in the FRANC2D/L, and the application of the extended finite element method (XFEM) in the Abaqus software. Special attention has been devoted to the fatigue analysis of the spar of a light aircraft. Numerical methods have been used to identify the weak points on the spar, along with the fatigue life of a spar crack and its direction of propagation. The results gained have corresponded well with the experimental values obtained on the spar of the alloy 2024-T3. Taking into account the good correlation between numerical and experimental values, the same finite element models have been used to estimate the crack life on the spars made of super alloys. The investigations have shown that the majority of the super alloys possess fatigue properties similar to aluminum, and in a few of them the life of fatigue crack has proved to be much longer than in the 2024-T3 alloy.
Кључне речи:
superalloys / numerical simulations / fatigue life / extended finite element method / experimental analysis of aircraft wing sparИзвор:
2012Издавач:
- Univerzitet u Beogradu, Mašinski fakultet
URI
http://eteze.bg.ac.rs/application/showtheses?thesesId=356https://nardus.mpn.gov.rs/handle/123456789/2288
https://fedorabg.bg.ac.rs/fedora/get/o:6005/bdef:Content/download
http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=513930915
https://machinery.mas.bg.ac.rs/handle/123456789/8
Колекције
Институција/група
Mašinski fakultetTY - THES AU - Grbović, Aleksandar PY - 2012 UR - http://eteze.bg.ac.rs/application/showtheses?thesesId=356 UR - https://nardus.mpn.gov.rs/handle/123456789/2288 UR - https://fedorabg.bg.ac.rs/fedora/get/o:6005/bdef:Content/download UR - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=513930915 UR - https://machinery.mas.bg.ac.rs/handle/123456789/8 AB - The researches in the field of fatigue failure are mainly aimed at identifying the factors which determine the fatigue behavior of the structural components and their inter relations. It is known that the fatigue resistance of structures is influenced mostly by load sequences, combinations of load types, as well as by materials and their fatigue properties. Therefore, the fatigue life cannot be determined without a thorough analysis of these parameters. Materials known as superalloys exhibit excellent mechanical strength and considerable creep resistance, especially at high temperatures. However, a critical property of these alloys is their resistance to fatigue-crack propagation, particularly at service temperatures. Besides, their fatigue features are not as easily accessible as of other materials (aluminum or steel, for instance). Consequently, determining the fatigue life in superalloy structures is not an easy task to accomplish. Taking into consideration the superalloy properties set in the NASGRO database, this thesis has explored the fatigue life of the real structural components, considering – at the same time – the stresses of both constant and variable amplitudes. The structural components have been designed in the CATIA v5, whereas the propagations of the 2D and 3D fatigue cracks through the structure have been simulated afterwards by the application of the FEM in the FRANC2D/L, and the application of the extended finite element method (XFEM) in the Abaqus software. Special attention has been devoted to the fatigue analysis of the spar of a light aircraft. Numerical methods have been used to identify the weak points on the spar, along with the fatigue life of a spar crack and its direction of propagation. The results gained have corresponded well with the experimental values obtained on the spar of the alloy 2024-T3. Taking into account the good correlation between numerical and experimental values, the same finite element models have been used to estimate the crack life on the spars made of super alloys. The investigations have shown that the majority of the super alloys possess fatigue properties similar to aluminum, and in a few of them the life of fatigue crack has proved to be much longer than in the 2024-T3 alloy. PB - Univerzitet u Beogradu, Mašinski fakultet T1 - Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura T1 - Investigation of fatigue life in superalloys structural components UR - https://hdl.handle.net/21.15107/rcub_nardus_2288 ER -
@phdthesis{ author = "Grbović, Aleksandar", year = "2012", abstract = "The researches in the field of fatigue failure are mainly aimed at identifying the factors which determine the fatigue behavior of the structural components and their inter relations. It is known that the fatigue resistance of structures is influenced mostly by load sequences, combinations of load types, as well as by materials and their fatigue properties. Therefore, the fatigue life cannot be determined without a thorough analysis of these parameters. Materials known as superalloys exhibit excellent mechanical strength and considerable creep resistance, especially at high temperatures. However, a critical property of these alloys is their resistance to fatigue-crack propagation, particularly at service temperatures. Besides, their fatigue features are not as easily accessible as of other materials (aluminum or steel, for instance). Consequently, determining the fatigue life in superalloy structures is not an easy task to accomplish. Taking into consideration the superalloy properties set in the NASGRO database, this thesis has explored the fatigue life of the real structural components, considering – at the same time – the stresses of both constant and variable amplitudes. The structural components have been designed in the CATIA v5, whereas the propagations of the 2D and 3D fatigue cracks through the structure have been simulated afterwards by the application of the FEM in the FRANC2D/L, and the application of the extended finite element method (XFEM) in the Abaqus software. Special attention has been devoted to the fatigue analysis of the spar of a light aircraft. Numerical methods have been used to identify the weak points on the spar, along with the fatigue life of a spar crack and its direction of propagation. The results gained have corresponded well with the experimental values obtained on the spar of the alloy 2024-T3. Taking into account the good correlation between numerical and experimental values, the same finite element models have been used to estimate the crack life on the spars made of super alloys. The investigations have shown that the majority of the super alloys possess fatigue properties similar to aluminum, and in a few of them the life of fatigue crack has proved to be much longer than in the 2024-T3 alloy.", publisher = "Univerzitet u Beogradu, Mašinski fakultet", title = "Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura, Investigation of fatigue life in superalloys structural components", url = "https://hdl.handle.net/21.15107/rcub_nardus_2288" }
Grbović, A.. (2012). Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura. Univerzitet u Beogradu, Mašinski fakultet.. https://hdl.handle.net/21.15107/rcub_nardus_2288
Grbović A. Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura. 2012;. https://hdl.handle.net/21.15107/rcub_nardus_2288 .
Grbović, Aleksandar, "Istraživanje zamornog veka nosećih strukturalnih elemenata izrađenih od super legura" (2012), https://hdl.handle.net/21.15107/rcub_nardus_2288 .