Sökning: "Peening"

Visar resultat 1 - 5 av 14 avhandlingar innehållade ordet Peening.

  1. 1. Fatigue life extension in existing steel bridges. High-Frequency Mechanical Impact treatment and Tungsten Inert Gas remelting in life extension and fatigue crack repair of welded steel structures

    Författare :Hassan al-Karawi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HFMI; TIG-dressing; Life extension; Post weld treatment; Gain factor; Linear elastic fracture mechanics; Crack retrofiting; Peening; fatigue crack; Crack detection; Microhardness; Concentration factor; LEFM; TIG-remelting; Strain gauge;

    Sammanfattning : This thesis investigates the performance of improved welds with two post-weld treatment methods for application on existing structures. High-Frequency Mechanical Impact (HFMI) treatment and Tungsten Inert Gas (TIG) remelting were used for fatigue life extension of welded structures. LÄS MER

  3. 2. The Influence of Residual Stresses on Fatigue Behaviour of Medium Carbon Microalloyed Steel

    Författare :Kamellia Dalaei; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fatigue; Seels; Shot peening; Seering arms; Relaxation;

    Sammanfattning : Subjected to the dynamic loading, truck components are exposed to fatigue loading. Hence the methods to improve the fatigue properties of the components are widely employed by manufacturers. One of the well known methods in this field is shot peening. LÄS MER

  4. 3. The Influence of Residual Stresses on Constant and Variable Amplitude Fatigue Behaviour of Steel

    Författare :Kamellia Dalaei; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel; Relaxation; Residual stress; Variable Amplitude; Shot peening; Fatigue;

    Sammanfattning : Subjected to dynamic loading, truck components are exposed to variable amplitude fatigue. The fatigue life of components is to a large degree controlled by the behaviour of the surface zones. LÄS MER

  5. 4. Life prediction and mechanisms for the initiation and growth of short cracks under fretting fatigue loading

    Författare :Alessandro Cadario; Bo Alfredsson; David Nowell; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fretting fatigue; Fretting experiment; Friction evolution; Fatigue crack initiation; Fatigue crack growth; Short crack; Non-destructive testing; Acoustic emission; Potential drop; Shot peening; Stress relaxation; Crack closure; Finite element method; Titanium alloy.; Engineering mechanics; Teknisk mekanik;

    Sammanfattning : Fretting fatigue is a damage process that may arise in engineering applications where small cyclic relative displacements develop inside contacts leading to detrimental effects on the material fatigue properties. Fretting is located in regions not easily accessible, which makes it a dangerous phenomenon. LÄS MER

  7. 5. Residual Stresses and Fatigue of Shot Peened Cast Iron

    Författare :Mattias Lundberg; Lin Peng Ru; Sten Johansson; Taina Vuoristo; Daniel Bäckström; Maqsood Ahmad; Jens Bergström; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The complex geometry of cylinder head in heavy-duty diesel engine makes grey cast iron or compact graphite iron a perfect material choice due to its castability, thermal conductivity and damping capacity. To increase the efficiency of the engine, the fatigue property of the material needs to be improved. LÄS MER