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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 20 for “"Load Frame"”.
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Development of an intermediate strain rate compression testing machine
… in the wedge bar helps ensure a near constant loading rate over the duration of the experiment. The yield stress is captured at above 80 of the average strain rate for the experiment for most of the materials investigated. The design work focuses primarily around the design of the new …
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Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… performing mixed-mode tests with a dual-actuator load frame. The material systems evaluated experimentally involved yellow-poplar (Liriodendron tulipifera), a hardwood of the Magnoliaceae family, as adherends and two different adhesives: a moisture-cure polyurethane (PU) and a …
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Surface Microstructure Evolution of Metallic Specimens Using the Large Chamber Scanning Electron Microscope
… include the incorporation of an in-situ uniaxial load frame for dynamic studies.</p>
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The design and construction of a large plane strain apparatus for testing reinforced soil specimens
… materials included. A 30,000-pound capacity load frame and a 20,000-pound capacity electric load cell were also constructed during this study. Drawings of the equipment constructed and a design method for the load cell are included. Preliminary tests on unreinforced and reinforced samples …
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Experimental Techniques for Shear Testing of Thin Sheet Metals and Compression Testing at Intermediate Strain Rates
… and dynamic conditions using a servo-hydraulic load frame and tension Kolsky bar, respectively. Specimens are fabricated from a 0.5in Al2024-T351 plate with their gage sections orientated in various directions. Tests are conducted at shear strain rates ranging from 0.01(1/s) to 9000(1/s). …
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Energy Absorption Capacity of Graphite-Epoxy Composite Tubes
… of these specimens were crushed statically in a load frame and twenty-four were crushed dynamically in a drop fixture. In order to characterize the tubes and specimens, a number of measurements were taken. These measurements included length, wall thickness, cross-sectional dimensions, volume, and …
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Compression Failure of Aluminum Plates Exposed to Constant Heat Flux
… on aluminum samples consisting of a compression load frame, a hydraulic system, and electric heaters. The effect of dimensional variation on failure behavior was examined. Aluminum 5083 and 6082 alloys were tested with three thicknesses, two lengths and two widths. Three heat fluxes and various …
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Ultimate Strength Prediction in Fiberglass/Epoxy Beams Subjected to Three-Point Bending Using Acoustic Emission and Neural Networks
… unidirectional fiberglass/epoxy beams were loaded to failure in a 3-point bend test fixture in an MTS load frame. Acoustic emission data were recorded from the onset of loading until failure. After acquisition, the acoustic emission data were filtered to include only data acquired up to 80 …
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Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A
… quasi-static fracture criterion, impulsively loaded cracks can have substantially different resistance to growth. To study dynamic fracture, a unique long-bar apparatus is used to fire a striker at the opposite end of notched and pre-cracked specimens to create a dominantly dynamic Mode-I …
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Rayleigh Wave Acoustic Emission during Crack Propagation in Steel
… features sought and validated, a dead weight load frame was modified, and data analysis procedures were developed. Criteria based on velocity, frequency content, amplitude and shape were devised to determine if an AE event is an SSP. The tests were designed to mimic load conditions on …
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Influences of Test Conditions and Mixture Proportions on Property Values of Soil Treated with Cement to Represent the Wet Method of Deep Mixing
… affected by slack and deformations in the load frame; (4) the secant modulus determined by local strain measurements was about 630 time the UCS; (5) typical values of Poisson's ratio range from about 0.05 to 0.25 for stress levels equal to half the UCS and about 0.15 to 0.35 at the UCS; (6) …
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Characterizing the tensile behavior of additively manufactured Ti-6Al-4V using multiscale digital image correlation
… of most specimens while the specimens were loaded, and a high magnification ex-situ DIC study (referred to as the micro-scale study) was performed on a single sample using a microscope after the sample was unloaded and removed from the load frame to observe the heterogeneous strain …
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Mechanical characterization of alloy 709 stainless steel after high temperature aging for application in advanced reactors
… of 5.0 mm and tested using an Instron 1331 load frame. Tensile tests were conducted with a constant strain rate of 0.001 s\textsuperscript{-1} and the results were compared. It was found that overall, the total percent elongation decreases with increasing aging duration and increasing aging …
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Mechanical evaluation of a modified prosthetic laryngoplasty using a toggle technique for the equine arytenoid cartilage
… process and base of the arytenoid to distribute loading over a larger area of cartilage. The objectives of this study were to compare the biomechanical properties of the standard technique to the modified laryngoplasty technique in both monotonic and cyclic loading. Larynges from 41 horses were …
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Effects of Experimental Conditions on Fracture Research Using 3D Printed Materials
… compression platen type, specimen centering, loading control method and rate, specimen size, specimen cross-sectional geometry, boundary constraints, and flaw parameters. The specimens were prepared using a 3D stereolithography printer utilizing clear resin material. Identical pre-existing …
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Debond Buckling of Woven E-glass/Balsa Sandwich Composites Exposed to One-sided Heating
… flux levels was performed with a custom designed load frame on sandwich composite columns. This enabled the influence of the debond to be measured using a 3D-Digital Image Correlation (DIC) technique spatially linked with a thermographic camera. The DIC allowed for a detailed observation of debond …
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Radiomic Analysis of Sonograms for the Detection of Tendon Damage
… tendon will be conducted simultaneously with loading in this study. A total of 14 juvenile, female porcine superficial digital flexor tendons were excised and loaded using an MTS Insight 10 load frame. US imaging was carried out using a Supersonic Imagine Aixplorer SLH20-6 transducer. After …
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Investigation of the Addition of Basalt Fibres into Cement
<p>Mechanical properties of concrete are most commonly determined using destructive tests including: compression, flexure, and fracture notch specimen tests. However, nondestructive tests exist for evaluating the properties of concrete such as ultrasonic pulse velocity and impact echo tests. One of …
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Long-term Durability Characterization and Prediction of a Urethane-based Adhesive
… the shape of a "T" for gripping in a universal load frame. Unlike some other test geometries, T-peel samples are often made with relatively thin adherends that may experience significant plastic deformation during testing. This extraneous energy dissipation greatly complicates the analysis to …
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Crack path selection and shear toughening effects due to mixed mode loading and varied surface properties in beam-like adhesively bonded joints
… improper bonding procedures or joint design, overload or other detrimental service situations, or in response to a variety of environmental challenges. In these situations, cracks can start within the adhesive layer or debonds can initiate near an interface. The paths taken by propagating cracks …