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Full-Text Articles in Engineering Science and Materials

Phase Boundary Propagation In Mass Spring Chains And Long Molecules, Qingze Zhao Jan 2016

Phase Boundary Propagation In Mass Spring Chains And Long Molecules, Qingze Zhao

Publicly Accessible Penn Dissertations

Martensitic phase transitions in crystalline solids have been studied and utilized for many technological applications, including biomedical devices. These transitions typically proceed by the nucleation and propagation of interfaces, or phase boundaries. Over the last few decades, a continuum theory of phase transitions has emerged under the framework of thermoelasticity to study the propagation of these phase boundaries. It is now well-established that classical mechanical and thermodynamic principles are not sufficient to describe their motion within a continuum theory, and a kinetic relation must be supplied to complete the constitutive description. A few theoretical techniques that have been used to ...


Mapping Trabecular Bone Fabric Tensor By In Vivo Magnetic Resonance Imaging, Michael J. Wald Dec 2010

Mapping Trabecular Bone Fabric Tensor By In Vivo Magnetic Resonance Imaging, Michael J. Wald

Publicly Accessible Penn Dissertations

The mechanical competence of bone depends upon its quantity, structural arrangement, and chemical composition. Assessment of these factors is important for the evaluation of bone integrity, particularly as the skeleton remodels according to external (e.g. mechanical loading) and internal (e.g. hormonal changes) stimuli. Micro magnetic resonance imaging (┬ÁMRI) has emerged as a non-invasive and non-ionizing method well-suited for the repeated measurements necessary for monitoring changes in bone integrity. However, in vivo image-based directional dependence of trabecular bone (TB) has not been linked to mechanical competence or fracture risk despite the existence of convincing ex vivo evidence. The objective ...