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 11 of 11 for “"Quasi-brittle materials"”.
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Higher-order discontinuous modelling of fracturing in quasi-brittle materials
Quasi-brittle failure is characterised by material degradation, fracturing and potential interaction of fragmented parts. The computational description of this behaviour has presented significant challenges to the mechanics community over the past few decades, driven by the development of …
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Fracture process zone : microstructure and nanomechanics in quasi-brittle materials
… tip. The context of this research is the FPZ in quasi-brittle materials, which is characterized by cracking at various scales. This study focuses on crack propagation and FPZ development at a fundamental material scale: the scale of the grain. With regard to the FPZ, the study seeks to understand …
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Failure processes in soft and quasi-brittle materials with nonhomogeneous microstructures
Material failure pervades the fields of materials science and engineering; it occurs at various scales and in various contexts. Understanding the mechanisms by which a material fails can lead to advancements in the way we design and build the world around us. For example, in structural engineering, …
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Three-dimensional modeling of failure in quasi-brittle materials and structures
… conditions, concrete structures present quasi-brittle behavior and failure due to the presence of a nonlinear fracture process zone ahead of the crack front. Predictive models and design methodologies have to be able to reliably calculate the load capacity, or structural strength, of …
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Three-dimensional peridynamic modelling of quasi-brittle structural elements
… of simulating the complex fracture processes in quasi-brittle materials. However, there is a lack of detailed validation studies in the literature, and significant work remains to quantify the predictive accuracy and generality of a peridynamic model. This thesis presents the development and …
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A gradient-damage theory for quasi brittle fracture
Phase-field modeling of brittle fracture of linear elastic solids has been the subject of several studies in the past 25 years. An attractive feature of this approach to model fracture is its seamless ability to simulate the complicated fracture processes of nucleation, propagation, branching and …
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Degradation of mechanical properties of bovine cortical bone during long-term whole bone storage.
… the conventional method for characterizing bone materials. However, due to the limited wall thickness of whole bones, only small cortical bone specimens can be obtained which creates challenges when accurate modulus measurements are required. Large-scale universal testing machines often introduce …
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Fracture characterization of clays and clay-like materials using flattened Brazilian Test
… many years to study the mechanical behavior of brittle and quasi-brittle materials like concrete, rock, wood, and ceramics. To date, the application of fracture mechanics to soils has been limited to dry and partially saturated soils where soil consistency changes due to suction and tends to be …
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Crack Self-Healing in Alkali-Activated Materials: From Mechanisms to Strategies for Enhancing the Healing Efficiency
… is calling for sustainable construction materials since portland cement production contributes about 8% of global anthropogenic carbon dioxide emissions. Alkali-activated materials (AAMs) have emerged as promising alternative binders to curb carbon dioxide emissions from portland cement …
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Hardening Cohesive/Overlapping Zone Model and Fractal Approach to Ductile Fracture
… COD) break down, especially for ductile materials and large crack extensions. In addition, even at small scale yielding, K, G, J- integral and COD are limitedly used to distinguish the onset of unstable fracture, without any concern regarding the pre-onset and post-reaction. On the other …
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A generalized finite element method for the simulation of non-planar three-dimensional hydraulic fracture propagation
… are a class of tensile fractures that occur in brittle and quasi-brittle materials due to the injection of a viscous fluid. Hydraulic fractures occur both naturally and created deliberately for engineering applications. In the oil and gas industry, it is a preferred method to enhance the …