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Showing 1 to 20 of 23 for “"ASTM standard"”.
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Acoustic Emission for Periodic Inspection of Composite Pressure Vessels
… pressure vessels has been proposed by the draft ASTM standard E07.04.03-95/1 (Standard Test Method for Examination of Filament-Wound Composite Pressure Vessels Using Acoustic Emission). The research presented follows the proposed acoustic emission technique and shows results that validate the …
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Method to Determine Compressive Bending Performance in Static and Fatigue Loading for Pediatric Non-Fusion Devices
… in the patients to allow for spinal growth. ASTM standards exist for fusion constructs. Growing-rod constructs place greater demands on the rods as no fusion is performed and the rods are continually loaded. Also, the constructs are serially lengthened at 6-month intervals placing additional …
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Performance Characterization of Ceramic Matrix Composites through Uniaxial Monotonic Tensile Testing
… at room temperature was performed following ASTM standard C1275 to measure ultimate tensile strength and elastic modulus. Equipment verification was carried out through alignment measurement with a gaged tensile specimen using ASTM E1012 to ensure the monotonic nature of the testing …
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Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics
… Discrete and continuous mixture models of the ASTM standard distillation test were compared to design the experimental mixtures and provide the distribution parameters of the continuous mixtures intended to simulate them. The results of calculations were found to agree very well with measured …
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Assessing the feasibility of yttria-stabilized zirconia in novel designs as mandibular anterior fixed lingual retention following orthodontic treatment.
… Next, specimens were milled according to ASTM standard C1161-13 and subjected to four-point flexural test to determine materials properties. Finite Element (FE) Analysis was employed to evaluate nine novel cross-sectional designs and compared to stainless steel wire. Each design was …
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Quantifying the Constraint Effect of Three-Dimensional Specimens with Biaxial Loading Using the J-A2 Method
… specimens are compared to those of other ASTM standard plane strain specimens, including three point bend and compact tension, to determine if loss of constraint exists. Finite element analysis models were developed for each specimen to determine the constraint parameter A2 for each, as …
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Temperature dependent physical properties of biodiesel and its blends with diesel fuel
… In order to measure the physical properties, ASTM standard test methods were followed. The data collected were modeled using equations suggested by other researchers. An equation is presented that allows the kinematic viscosity to be calculated as a function of the temperature and the …
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Investigation of Ultra-High Performance Concrete for Longitudinal Joints in Deck Bulb Tee Bridge Girders
… the connection is stressed axially in tension. ASTM-standard test procedures in this study showed that compressive strengths up to 16 ksi, tension strengths above 2 ksi, and bond strengths up to 7 ksi can be achieved with this particular UHPC, all with improved ductility beyond that of …
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Lead-Free Gunshot Residues as Forensic Evidence
… The American Society for Testing and Materials (ASTM) standard ASTM E1588-95 is no longer applicable to such residues. With this emerging market, the forensic community must develop and validate methods aimed at the detection of lead-free GSR on the hands of suspected shooters. This study …
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Measurement of Radiofrequency Induced Heating in Patients with Retained Post-Surgical Epicardial Leads During MRI
… The phantom was designed according to the ASTM standard for measurement of RF-induced heating on or near passive implants. The properties of the phantom including its dielectric constant, electrical conductivity, specific heat, and thermal conductivity were characterized and found to agree …
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Comparing flexural strength of acrylic processed by three different techniques
… the American Society for Testing and Materials (ASTM) standard D790-03 for flexural strength of reinforced plastics. The specimens were loaded until fracture or 15 mm of displacement on a three-point bending test machine (InstronRTM Model 5565 Universal Testing Machine).;Results: Data from this …
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The Tissue-reduced Virtual Family Models for RF-induced Heating Evaluation of Passive Medical Implants at 1.5 T and 3 T
… for the safety of patients. The study in ASTM phantom and human models is adopted to evaluate the RF-induced heating near the medical implants. To make the experiment in human models more practical, the tissue-reduced virtual family models were proposed for RF-induced heating simulation …
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Effect of Geometric Imperfections (Wrinkles) on the Circumferential Strength of a Composite Polymer Liner for Pressure Pipes
… the split-disk test method which is defined by ASTM Standard D2290. The laboratory tests were conducted to examine the effects on the response of the liner of loading rate, cyclic loading, and presence of different wrinkle configurations. A series of two-tailed Mann-Whitney statistical tests …
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Burst Pressure Prediction of Filament Wound Composite Pressure Vessels Using Acoustic Emission
… during hydroproof testing for a set of eleven ASTM standard 5.75 inch diameter fiberglass/epoxy bottles. Amplitude distributions were created using only the AE data up to 25% of the expected burst pressure to simulate low level proof loadings (thereby avoiding damage to the bottles). The …
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Evaluation of New Weigh-in-Motion Technology at the Virginia Smart Road
… not complying with the required 95% set forth by ASTM E-1318. In comparison, using the manufacturer's processed data for the OWC scale yielded only 18% of its tests with 10% error or less, far below the ASTM standard. A model was developed to re-calculate the axle weights using the raw sensor data …
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Quantification of wildfire-induced perturbations to soil-water retention curves and their impact on rainfall runoff
… Van Genuchten parameters θr, θs, n, α, using ASTM standard methods and the Meter HYPROP system. We found high quality fits to SWRCs from both unburned and burned samples using the Van Genuchten equation. While the magnitude of fire perturbation varies across fire sites, in most cases we found …
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Effects of Damage Arrestment Devices on the Fatigue Life of Impacted Composite Sandwich Beams
… Static 4-point bend testing following the ASTM standard D6272 was investigated to determine the flexural behavior of composite sandwich beams. Six different beam cases, with dimensions 1-inch wide by 11.75-inch long, were investigated. The cases considered were beams with and without …
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Natural Kenaf Fiber Reinforced Composites as Engineered Structural Materials
… saturated environments, were assessed.;Based on ASTM standard testing, a comparison of flexural, tensile, compressive, and shear mechanical properties was also made between an untreated kenaf fiber reinforced composite, a chemically treated kenaf fiber reinforced composite, a glass fiber …
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The tensile performance of closed cell foam expansion joints: a study on the deleterious effects of compression set
… were conducted in accordance with the current ASTM standard for measuring compression set. This test is conducted at ambient temperature (73°F) and for a compression cycle duration of just 22 hours. A parallel set of experiments were also conducted to simulate the actual in-service conditions …
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Characterization of Pharmaceutical Materials by Thermal and Analytical Methods
… with the United States Pharmacopeia (USP) standard set of active pharmaceutical ingredients (API). DEA measures and differentiates the crystalline solid (low; 10¿¿¿¿¿ pS/cm) and amorphous liquid (high; 10¿¿¿ pS/cm) API electrical ionic conductivity. DEA ionic conductivity cycle establishes …
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