Global ETD Search
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Showing 1 to 13 of 13 for “"Crack Damage"”.
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Modeling of active crack damage control and the active fatigue damage control of adhesive joint
Active damage control is a new technique which mimics the self-repairing capability of biological beings and can be used to greatly increase the structural integrity and fatigue life. This thesis describes two approaches used in active damage control: direct stress cancellation and indirect stress …
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Fracture Initiation and Propagation in Low Porosity Crystalline Rocks: Implications for Excavation Damage Zone (EDZ) Mechanics
… are commonly associated with introducing some damage to the surrounding rock mass through the initiation and propagation of fractures parallel to the excavation boundary due to disturbance to the in situ stress condition, as well as the excavation process quality. The induced fractures in depth …
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The development of a systematic experimental method for damage identification
The diagnostics of slight damage are extremely significant for providing the early warning damage information for in-service structures. This thesis presents the development of a systematic experimental method to identify structural damage by the experimental techniques. Three carbon fabric squared …
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Microvascular Networks for Continuous Self -Healing Materials
… composites enable a single repair of crack damage in a given location. Re-mendable polymers have demonstrated crack mending for multiple cycles, but only with heat treatment and applied pressure. We demonstrate, for the first time, the autonomic characteristics of microencapsulated …
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Structural Health Monitoring Using Deep Learning
Concrete structures are susceptible to damage over their lifespan and cracks are often the earliest noticeable form of damage. Crack width is an indicator of the severity of crack damage. Unaddressed cracks can develop to failures potentially resulting in injury, death and huge economic costs. …
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Microencapsulation of reactive amines and isocyanates and their application to self-healing systems
… self-healing systems enable repair of crack damage in polymers and polymer matrix composites. Existing self-healing chemistries are limited by relatively weak chemical bonding between the matrix and the healing material, temperature stability, and side reactions that degrade the active …
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Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials
… of these vessels leads to the formation of microcracks, which allow gas phase leakage across the tank walls. In this dissertation, self-healing functionality is imparted to a structural composite to effectively seal microcracks induced by both mechanical and thermal loading cycles. Two different …
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Interfacial Mechanics in Fiber-Reinforced Composites: Mechanics of Single and Multiple Cracks in CMCs
… The first issue is the competition between crack deflection and penetration at the fiber/matrix interface. When a matrix crack, the first fracture mode in a CMC, reaches the interface, two different crack modes are possible; crack deflection along the interface and crack penetration into the …
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Geophysical signatures of crack initiation and growth in rocks under uniaxial compression
… rocks is a complex phenomenon. Understanding the crack nucleation, propagation, and mechanisms involved during rock fracture plays an important role in the design of engineering structures, in the field of seismology, in natural resource extraction, different rock-breaking processes such as …
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Development of self-healing techniques for fiber reinforced composites
… present in transverse direction) appear matrix cracking and delaminations between the reinforcing plies. A primary limitation of these composites is the poor interlaminar toughness and strength. The mismatch of anisotropic mechanical and thermal properties in between plies of deferent principal …
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Diffuse Damage Repair Mechanism in Bone
<p>Bone microdamage is a result of fatigue, creep or ‘wear and tear’ caused by physiological activities and largely contributes to bone fragility. Bone, unlike engineered materials, has the ability to repair the microscopic cracking or microdamage through targeted, osteoclast-mediated bone …
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Mechanical properties and microcracking behaviour of heterogeneous rocks after high-temperature treatment
… influence their strength characteristics and damage evolution mechanisms. In deep underground engineering, accurately predicting the mechanical properties, microcracking behavior, and strength evolution of heterogeneous rock under high-temperature conditions remains a key scientific challenge. …
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Laboratory Strength Testing of Argillaceous Limestone Under Varying Saturation, Scale, Loading Rate, and Confinement Conditions
… The excavation of hard rocks at depth can induce damage to the surrounding rock mass. This damage corresponds to the initiation and propagation of fractures and is related to in situ stress conditions and excavation processes. Heterogeneous rock masses can further complicate the initiation and …