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 20 of 120 for “"Fracture Energy"”.
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Experimental study of fracture energy for foamed concrete
… has shown that there is a lack of research on fracture energy of foamed concrete, which is the main parameter that governs damage and cracks mechanisms of any structural components. Therefore, the present study aims to experimentally investigate the fracture energy of foamed concrete using beam …
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Factors affecting the fracture energy of a structural adhesive
A fracture investigation was conducted on a modified epoxy adhesive (Metlbond 1113-2). Initially various adhesive fracture strength and energy tests and the mechanisms of mechanical and chemical adhesion were discussed. A critical study was then made of the sensitivity of the strain energy release …
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Measuring the fracture energy of bed breakage using a short impact load cell
Particle fracture is the elementary process that governs comminution. In industrial machines particle breakage occurs mainly through three mechanisms: impact, abrasion and attrition. Of these mechanisms, impact breakage is known to be the most basic form of particle size reduction. Comminution …
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Fracture Mechanics of Networks
… strand mechanics and connectivity to predict fracture in diverse networks that constitute polymeric, architected, and biological materials. While traditional models predict the intrinsic fracture energy – the minimum energy to propagate a crack per unit area – of a polymer network is the …
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Fatigue-fracture relation on asphalt concrete mixtures
… potential relationships between fatigue and fracture parameters obtained from standardized laboratory tests. A flexural bending beam test was used to obtain two fatigue parameters, which include a traditional fatigue criterion based on stress or strain to find number of cycles to failure and …
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Measuring and predicting sealant adhesion
… relative humidity and test rate. The fracture energy of the silicone sealant bonded to glass, aluminum or stainless steel was measured with the 180° peel, the 45° peel and the pure shear butt joint test methods. Scanning electron microscopy, electron spectroscopy for chemical analysis …
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Fracture Tests for Bituminous-Aggregate Mixtures: Laboratory and Field Investigations
… This study investigates the ability to apply fracture mechanics principles to study asphalt concrete cracking through experimental techniques. Single-edge notched beam (SE(B)) and disk-shaped compact tension (DC(T)) test geometries were developed to estimate the fracture energy of asphalt …
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Fracture Characteristics of Asphalt Concrete in Mode I, Mode II, and Mixed-Mode
… was found that attempted to capture Mode II fracture energy in asphalt concrete, so a test was developed from an extensive review of Mode II tests in the fields of metal, plastic, and PCC. Limited work has been performed in Mixed-Mode testing of asphalt concrete, but only Crack Mouth Opening …
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Quantification and Characterization of Fracture Resistance in Asphalt Concrete Based on R-Curve Method
<p>The application of fracture energy is widely applied in the evaluation of cracking in the laboratory for asphalt concrete. However, this single number does not provide information on the characterization of the initiation and propagation of cracks. The Resistance Curve method, or R-Curve, is …
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The selection of adhesives and composite matrix resins for aircraft repairs
… tensile modulus, elongation at failure, fracture energy, compression strength, compression modulus, water uptake, Tg dry and we t and diffusion coefficient. A computer programme written at Leicester Polytechnic was adapted to suit an IBM PC and this allowed water uptake within a lap joint …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
… community to characterize the low temperature fracture and creep properties of asphalt materials. The information from these tests enables pavement engineers to design and construct asphalt pavements that can withstand the stresses caused by thermal loads and underlying cracks in the field. …
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Displacement rate and temperature effect on asphalt concrete cracking potential
… and loading conditions, a good understanding of fracture behavior of AC over a spectrum of conditions including temperature and rate of displacement is needed. This thesis has two major objectives. First is to gain an overall understanding of fracture behavior of AC under a wide spectrum of …
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Fracture analysis of debonding mechanism for FRP plates
… the interface. This thesis describes a global-energy-balance based fracture-mechanics model for the debonding mechanism of externally bonded FRP plates attached to concrete beams.<br/><br/>The model investigates the possible propagation of an existing interface crack by considering the energy …
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Fracture analysis of debonding mechanism for FRP plates
… the interface. This thesis describes a global-energy-balance based fracture-mechanics model for the debonding mechanism of externally bonded FRP plates attached to concrete beams. The model investigates the possible propagation of an existing interface crack by considering the energy balance of …
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Investigation of cracking resistance of recycled Superpave mixtures
… were performed to assess mixture cracking and fracture properties. Results showed that mixtures containing 10% RAP and 5% RAS have relatively low fracture energy, creep compliance, energy ratio, and flexibility index but high resilient modulus. These results indicate that mixtures containing …
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Long-term Durability Characterization and Prediction of a Urethane-based Adhesive
… reduce stress concentrations and weight. With energy dissipating adhesives, noise and vibration reduction are possible, as is the use of unique or complicated designs that could not otherwise be constructed. Adhesive properties however, can vary greatly with time, temperature, and environmental …
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Flowable Fibrous Concrete For Thin Pavement Inlays
… tomography (CT), with the measured toughness or fracture energy response of a FFC specimen. This new type of concrete, FFC, was developed to provide a workable, flowable mixture that could be utilized to rapidly construct thin concrete pavement inlays. A full-scale demonstration project verified …
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Performance Evaluation and Durability Studies of Adhesive Bonds
… specimen geometry is proposed for combinatorial fracture studies of structural adhesive bonds. This specimen geometry enabled the characterization of fracture energy vs. bondline thickness trends through fewer tests than those required during a conventional "one at a time" characterization …
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Exploration of Wood DCB Specimens Using Southern Yellow Pine for Monotonic and Cyclic Loading
… beam (DCB) as a valid means for testing Mode I fracture energy in wood adhesive bonds. Southern yellow pine (SYP) adherends were used with epoxy and phenol formaldehyde (PF) impregnated films, providing two systems with different characteristics for investigation. An adhesive penetration …
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Monitoring-While-Drilling for Open-Pit Mining in a Hard Rock Environment: An Investigation of Pattern Recognition Techniques Applied to Rock Identification
… was: penetration rate, torque, specific fracture energy, vertical vibration, horizontal vibration, penetration rate deviation and thrust deviation. Specific fracture energy and self-organizing-maps were explored as a means of labelling training data and found to be inadequate. Several …
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