Search for dissertations about: "Closed cracks"
Showing result 1 - 5 of 16 swedish dissertations containing the words Closed cracks.
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1. Closed-die forging and slab hot rolling with focus on material yield : some industrial problems analysed by FEM
Abstract : The thesis is focussed on improving the material yield in closed-die forging and rolling. The former is restricted to the manufacturing of heavy crown wheels and front axle beams and the latter to the hot rolling of steel slabs. To enhance the yield the commercial FE-codes Form2D and Dyna3D are used. READ MORE
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2. Nonlinear Interaction Between Ultrasonic Waves and Cracks and Interfaces
Abstract : The subject of this thesis is the development of new ultrasound inspection techniques for detection of cracks that are smaller than the wavelength of the inspecting wave and the characterization of cracks in fluid-filled pipes as either surface-breaking or subsurface. The spectrum of the scattered field of a partially closed crack comprises harmonic components not expected to be found in the case of linear scatterers such as pores or inclusions. READ MORE
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3. Initiation and early crack growth in VHCF of stainless steels : Experimental and theoretical analysis
Abstract : Mechanical fatigue is a failure phenomenon that occurs due to repeated application of mechanical loads. Very High Cycle Fatigue (VHCF) is considered as the domain of fatigue life greater than 10 million load cycles. READ MORE
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4. Elastic Wave Scattering by Closed Cracks and Thin Flaws - Multiple Scattering and Resonances
Abstract : In this thesis we study elastic wave scattering by thin flaws and closed cracks, which finds applications in ultrasonic testing and evaluation of materials. First we consider the scattering of an SH-wave by a thin finite elastic layer between two elastic half-spaces. READ MORE
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5. Elastic Wave Scattering by Cracks - Interfacial Forces and High Frequency Diffraction
Abstract : This thesis treats elastic wave scattering by cracks with interfacial forces. The results are of practical interest in ultrasonic testing and includes development of numerical methods used to predict such testing. First the canonical problem of two-dimensional (2-D) diffraction from a semi-infinite crack is solved. READ MORE