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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 38 for “"specimen preparation"”.
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Laboratory specimen preparation for cold recycled asphalt
… aims at finding a method for laboratory sample preparation for cold recycled asphalt which will produce specimens, in the shortest time, having properties similar to those of material laid in the field. In Phase One of the testing procedure the amount of new binder needed and the target …
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Factors affecting the fracture energy of a structural adhesive
… sensitivity of the strain energy release rate·to specimen preparation. The rate and time dependence of the adhesive were then investigated using the TDGB specimen. The fractured surfaces were also studied using scanning electron microscopy to determine the mechanisms of failure.
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Considerações sobre ensaios triaxiais em areias
… tests on sands. A study of a new method of specimen preparation using pluviation, where the unit weight of the sample can be previously specified, is also presented. ln addition, a simplified saturation technique in which the specimens were submitted, outside the triaxial cell, to a low …
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Study of a microcomposite metal-doped polyimide adhesive
… appropriate adhesive/dopant system and improved specimen preparation and testing techniques.
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Strain relaxation in TEM lamellae probed by 4D-STEM: from projected strain to dynamical-diffraction-based reconstruction of composition
… relaxes at the free surfaces created during specimen preparation. The resulting three-dimensional strain field breaks the direct link between measured strain and composition, and intensity distribution within diffraction discs associated with dynamic diffraction varies, hindering precise …
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Microreflectance and ellipsometric studies on the polished surfaces of some minerals
… of microphotometric error known as the Standard-Specimen-Reflectance-Difference-Phenomenon (SSRDP) is investigated, its possible causes are discussed and tables evaluated for its correction. The results of this study are compared with those of other workers and differences between the …
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Microfabric changes during the deformation of clays.
… development o f new and more reliable methods of specimen preparation. Free z e drying and �critical point drying were found to be the most reliable for scanning electron microscopy. The latter me t hod has been used with great success by the writer using acet one as an intermediate liquid and …
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THE EFFECT OF WATER ON THE PHYSICAL PROPERTIES OF EPOXIDES
… properties of bulk epoxides, a new method of specimen preparation was developed. Water absorption in epoxides was found to involve two processes, namely plasticization and cross linking; the predominant effect depends on the particular system. Water absorption in epoxides was found to …
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Elevated temperature mechanical properties of zirconium diboride based ceramics
… 2000ºC. For ZC, surface flaws introduced during specimen preparation were the source of critical flaws in the material up to 1400ºC, sub-critical crack growth of surface flaws between 1600 and 2000ºC, and microvoid coalescence above 2000ºC.</p> <p>It was also shown that thermal annealing at …
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Effectiveness of autogenous tooth bone used as a graft material for regeneration of bone in minipig
… microscope with Haematoxylin-eosin staining. Specimens were also semi-quantitatively evaluated via histomorphometric study. Percentage of new bone over total area was evaluated using digital software for area calculation. RESULT: All specimens were available but one in the left side (control …
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The Fracture Toughness of Fibre Concretes
… as Model failure. A numerical study of the test specimens used in the experimental work has been carried cut using constant strain triangular elements.<br/><br/>Three new fracture toughness tests are proposed. Two of these tests are based on the traditional standard concrete quality control …
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Domes and Crosses: Exploiting synergies in two methodologies for biaxial tensile testing of membrane tissues
… can induce a state of biaxial tension within a specimen and both have their advantages and disadvantages. Bulge testing has the benefit of imposing a simple boundary condition on the tissue, making it quick and easy to set up. Planar Biaxial Tensile (PBT) testing is very sensitive to specimen …
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Analyzing the size effect on fracture toughness of mortar through flattened Brazilian tests
… about whether the fracture toughness varies with specimen size. The purpose of this research is to investigate the size effect on the fracture toughness of mortar specimens. First, the methods for calculating elastic modulus, tensile strength, and fracture toughness in previous research are …
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Hydraulic fracturing through 3D printing and lattice modelling
… more brittle powder-based gypsum-like 3D printed specimens are successfully fractured by the split Hopkinson pressure bar (SHPB) system for investigating the dynamic crack propagation and coalescence. In addition to the high accuracy and flexibility in specimen preparation, the desired fracture …
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Tensile and Compressive Mechanical Behavior of IM7/PETI-5 at Cryogenic Temperatures
… and handling, aging or preconditioning, specimen preparation, laminate ply lay-up, and test procedures. It is the intent of this thesis to investigate and report performance of PMC's in cryogenic environments by providing analysis of results from experimental data developed from a series …
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DETERMINATION OF DYNAMIC MODULI AND PERMANENT DEFORMATION OF MARYLAND ASPHALT MIXTURES USING AMPT
… be reduced from 12 to 3. The reduction in total specimen preparation (from 60 to 15 hours) and testing time (from 30 to 10 hours) represents substantial economies in structural characterization of asphalt mixtures and motivates state agencies to perform DM and RLPD testing on routine basis to …
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Study into mechanical and electrochemical properties of coating deposits and welded-coated components using the HVOF (High Velocity Oxy-Fuel) process.
… and fatigue loads. The solid bar and sheet specimens were tested and prepared in accordance with the test standards "Standard Test Method for Adhesion or Cohesion Strength of Thermal Spray Coatings". The specimens were tensile and fatigue tested pre and post exposure to brine. SEM and EDS …
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Degradation behaviour of the mechanical properties of bovine cortical bone
… factors influencing its performance, notably specimen preparation, including machining techniques and storage protocols. Additionally, the manner in which machine compliance is accounted for is not always reported, particularly concerning the quasi-brittle nature of cortical bone. Even when …
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Determinants of work-related skin symptons and dermatitis associated with cleaning agents among health workers of two tertiary hospitals in Southern Africa
… factors for probable contact urticaria included specimen preparation (ORadj 2.65, 95% CI: 1.06-6.38) and wound cleaning and disinfection (ORadj 3.10, 95% CI: 1.24-8.81). Training on protection against adverse health effects of cleaning agents (ORadj 0.54, 95% CI: 0.31-0.89) was protective against …
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Degradation of mechanical properties of bovine cortical bone during long-term whole bone storage.
… 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 global compliance errors that obscure precise displacement data, in addition to localized …
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