Search for dissertations about: "Arbitrary cracks"

Showing result 1 - 5 of 11 swedish dissertations containing the words Arbitrary cracks.

  2. 1. Elastic Wave Propagation in Anisotropic Media. Application to Ultrasonic NDT

    Author : A. Jonas Niklasson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; layered media; cylinders; cracks; integral equations; scattering; nondestructive testing; elastic waves; ultrasonics; transducers; anisotropy;

    Abstract : The subject of this thesis is elastic wave propagation in anisotropic materials with application to ultrasonic nondestructive testing (NDT). The first part of the thesis is concerned with modeling of ultrasonic transducers and wave propagation in anisotropic materials in general. First, a scalar 2-D case is considered. READ MORE

  4. 2. Elastic Wave Scattering by Closed Cracks and Thin Flaws - Multiple Scattering and Resonances

    Author : Arne S. Eriksson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SH-wave; evaluation of materials; direct integral equation; singularity expansion; ultrasonic testing;

    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

  5. 3. Analysis of transverse cracking in cross-ply laminates: Weibull distribution based approach

    Author : Vivek Richards Pakkam Gabriel; Patrik Fernberg; Mohamed Loukil; Spyros Tsampas; Erik Marklund; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Intralmainar cracking; Weibull distribution; Failure stress; Monte Carlo simulation; Fatigue loading; Quasi-static loading; Polymera kompositmaterial; Polymeric Composite Materials;

    Abstract : Fiber reinforced polymer composite laminates make up more than 50% of modern aircrafts. Such composite laminates are exposed to various environmental and in-service thermo-mechanical load conditions. READ MORE

  6. 4. On crack growth in functionally graded materials

    Author : Andrey P. Jivkov; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Hållfasthetslära; Solid Mechanics;

    Abstract : Stress intensity factors' behaviour is studied for long plane cracks interacting with a region of functionally graded elastic material. The region is assumed embedded into a large body treated as a homogeneous elastic continuum. READ MORE

  7. 5. Degradation of thermo-elastic properties in damaged composite laminates : a theoretical study

    Author : Peter Lundmark; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymera konstruktionsmaterial; Polymeric Composite Materials;

    Abstract : Fiber composites are today widely used in different load carrying structures. The main reason is their high stiffness and strength to weight ratio. Due to these specific properties they are frequently used in car, marine and space industry. READ MORE