Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Stress Wave Propagation"”.
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Stress Wave Propagation In A ‘Simplified Surrogate Tibia’ Subjected To Blast Loading
… landmine blast scenario. The study of stress wave propagations in the tibia during an anti-vehicle landmine blast aids in scientific understanding of blast injuries produced by anti-vehicle landmines by refining current ideas, discovering novel phenomena, and filling information gaps. …
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Axisymmetric stress wave propagation in weakly coupled layered structures: Analytical and computational studies
Stress wave propagation in layered systems with infinite and finite numbers of isotropic layers is investigated. A transfer matrix formulation for the axisymmetric problem is developed using a double integral transform technique and a symbolic algebra system. The propagation and attenuation zones …
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Measurements of Surface Displacements During Stress Wave Propagation in Opaque Solids Using Pulsed Laser Speckle Photography
… of measuring surface displacements due to stress waves and propagating cracks in solids. A double exposure recording allows the comparison of object points to be made between two states of displacement. The final specklegram is processed and treated as a diffraction grating to yield both …
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Numerical investigation of dispersion in Hopkinson Pressure Bar
… very little attention to the modelling of the stress wave propagation in the cylindrical bars. This dissertation focuses on the numerical modelling of stress wave propagation in HPBs.
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Detection of in-plane stress waves with Polyvinylidene Fluoride (PVDF) sensors
… (PVDF), a piezoelectric polymer, is an excellent stress sensor. The objective of this research is to investigate the application of the PVDF sensors for detection of in-plane stress waves in 31 and 32 modes. This was achieved by focusing on aspects of PVDF sensing related to determination of …
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Developments in topology and shape optimization
… parameter-free shape optimization method; a stress-constrained topology optimization; and a wave tailoring topology optimization. In shape optimization, the independent node movement approach, wherein finite element node coordinates are used directly as design variables, allows the most …
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Multiscale modelling of sutures in a high-performing biological protective structure: the turtle shell
… suture geometry can be used to tailor stress-wave propagation; and the presence of sutures can reduce the maximum strain energy density, a key indicator for a material failure, during a predator attack by 31 times. The work presented paves the way for the inclusion of sutures in …
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Rayleigh Wave Acoustic Emission during Crack Propagation in Steel
… An SSP has components of various modes of wave propagation. The component with the largest amplitude is a Rayleigh surface wave pulse. The possibility that these surface modes have much higher amplitudes than bulk modes of acoustic emission (AE) was illustrated by an idealized thought …
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Degradation of mechanical properties of bovine cortical bone during long-term whole bone storage.
… heights against three alternative methods i.e. stress wave propagation, tensile extension, and three-point bending, each of which typically require larger specimens. A high degree of correlation between the methods demonstrates the accuracy and utility of this approach in small-specimen testing.
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A study on the behaviour of guided wave propagation in utility timber poles
… insufficient to reflect the actual behaviour of stress wave propagation in the columnar structures. Also, the anisotropic behaviour of timber and the effects of environment are not taken into account in numerous conventional non-destructive evaluations (NDE) that leads to errors regarding the …
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Molecular tailoring of interfaces for thin film on substrate systems
… a laser-spallation technique. Laser-induced stress waves are chosen because they dynamically load the thin film interface in a precise, non-contacting manner at high strain rates and are suitable for both weak and strong interfaces. Photodefinable polyimide films are used as dielectrics in …
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Design and fabrication of ceramic beads and laminated composites for the study of stress wave mitigation
Research on theoretical models to study stress wave management has created new opportunities to design and fabricate beads and laminated composites in order to improve the material performance of engineering devices such as armors, casing for sensitive equipment, and heavy machinery. This thesis …