Patterning, Transfer, and Tensile Testing of Covalent Organic Framework Films with Nanoscale Thickne
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Zhu, Dongyang↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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On void formation during the simulated tensile testing of polymer-filler particle composites
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organic↗
Source Truncation and Exhaustion: Insights from Quantitative in situ TEM Tensile Testing
Not Available
Kiener, D.↗
Nanoparticle rearrangement under stress in networks of cellulose nanofibrils using in situ SAXS during tensile testing
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99 GENERAL AND MISCELLANEOUS↗
An in-plane tensile test for rheological and formability identification: comparison between experimental and numerical FLC
Both accurate constitutive laws and formability limits of materials are essential for a numerical optimization of sheet forming processes. To identify these behaviors, experimental databases are needed. In this work, experiments are performed from a biaxial device able to give for a unique in-plane specimen a good prediction of rheological parameters and formability. The proposed device is a servo-hydraulic testing machine provided with four independent dynamic actuators. By localizing necking in the central zone of the specimen, the strain path in this zone is controlled by the speed ratio between the two axes and the whole forming limit diagram can be covered. The experimental forming limit curve for the aluminium alloy AA5086 is determined thanks to a rigorous procedure for detecting the onset of necking in the specimen. Material parameters (constants of both hardening law and anisotropic yield criterion) are identified from the global measurement of force versus displacement curves by means of an inverse analysis procedure. Comparison between experimental and numerical forming limit curves are presented. For the numerical FLCs, two sets of material parameters are compared, the former is identified through the classical uniaxial test and the latter thanks to the dedicated cruciform specimen.
36 MATERIALS SCIENCE↗
BLIND PREDICTION OF THE RESPONSE OF AN ADDITIVELY MANUFACTURED TENSILE TEST COUPON LOADED TO FAILURE.
Abstract not provided.
Gilkey, Lindsay Noelle↗
Experimental Determination of the Radial Displacement Field in the Neck of Samples after a Tensile Test
This Letter presents the results of a study of the radial displacement fields arising upon stretching of cylindrical samples before their disintegration. The object of study was sv-07Kh16N6 stainless steel wire containing filiform defects oriented along the sample axis. Using X-ray tomography of the sample necks, the coordinates of the defect points in the sample are determined and the displacement field is recovered from them. The resulting dependence is represented by an approximate formula.
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
Elevated Temperature Tensile Tests on DU10Mo Rolled Foils TEV-2194 R1
This work was conducted under PLN-4560, “GTRI Mechanical Property Characterization Test Plan,” which contains additional requirements and instructions for testing. The following report presents details of the testing system, testing methods, and mechanical properties determined from the test data.
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS↗
Swab Tensile Testing Results [Slides]
HP PA11 material swabs predominantly broke at the joint between the head and the neck, although there was significant variation in the break locations. HP PA12, Injection Molded, and FormLabs (Surgical Guide V1 Resin) material swabs predominately broke in the neck region.
36 MATERIALS SCIENCE↗
High throughput tensile testing using femtosecond laser fabrication technique [Slides]
The main purpose of this presentation is to demonstrate that a high throughput method for fabrication and mechanical testing produces local and bulk-like results.
36 MATERIALS SCIENCE↗
Specimen for high-temperature tensile tests
Split nut with internal taper to hold specially formed specimen composed of filaments of refractory material provides means for holding at high temperature and under tension so that performance evaluations may be made.
Coulbert, C. D.↗
Impact tensile testing of wires
The test consists of fixing one end of a wire specimen and allowing a threaded falling weight to strike the other. Assuming the dynamic stress in the wire to be a function only of its strain, energy considerations show for negligible wire inertia effects that the governing dynamic stress-strain law can be determined directly from impact energy vs. wire elongation data. Theoretical calculations are presented which show negligible wire inertia effects for ratios of wire mass to striking mass of the order of .01 or less. The test method is applied to soft copper wires and the dynamic stress-strain curve so determined is found to be about 30 percent higher than the corresponding static curve.
Dawson, T. H.↗
Hot tensile tests of Inconel 718
The physical metallurgy of near-solidus integranular cracking in Inconel 718 welds was investigated. The data, although inconclusive, suggest at least two mechanisms which might explain intergranular cracking (microfissuring) in the heat-affected zone of several high temperature alloys. One theory is based on the separation of intergranular liquid while the other involves mechanical failure of solid ligaments surrounded by intergranular liquid. Both mechanisms concentrate strain in the grain boundaries resulting in low strain (1%) intergranular brittleness. The mechanisms reported might also pertain to the physical metallurgy of casting, powder metallurgy sintering and hot isostatic pressing.
Source record↗
Elevated-Temperature Tensile-Testing of Foil-Gage Metals
Automated system for measuring strain in metal foils at temperatures above 500 degrees F (260 degrees C) uses mechanical extensometer and displacement transducer. System includes counterbalance feature, which eliminates weight contribution of extensometer and reduces grip pressure required for attachment to specimen. Counterbalancing feature overcomes two major difficulties in using extensometers with foil-gage specimens: (1) Weight of extensometer and transducer represents significant fraction of total load applied to specimen and may actually damage it; and (2) grip pressure required for attachment of extensometer to specimens may induce bending stresses in foil-gage materials.
Blackburn, L. B.↗
Determination of carbon fiber adhesion to thermoplastic polymers using the single fiber/matrix tensile test
The single fiber adhesion shear test has been adapted to testing the adhesion between carbon fiber and thermoplastic polymers. Tests of three thermoplastics, polycarbonate, polyphenylene oxide and polyetherimide indicate the shear adhesion strength is significantly less than of an epoxy polymer to the same carbon fiber.
Bascom, W. D.↗
Comparison of Ultrasound with Tensile Testing of Thermally Damaged Polyimide Insulated Wiring (MIL-W-81381)
Ultrasonic measurements were performed on MIL-W-81381/7, /12, and /21 wire, a polyimide (Kapton) insulated wire. The phase velocity for the 20-gauge MIL-W-81381/7 wire had a baseline value of 3023 plus or minus 78 m/s. After exposure to high temperatures, the wire's phase velocity rapidly increased, and reached an asymptotic value of 3598 plus or minus 20 m/s after 100 hours exposure. Similar responses were measured in other gauges. The baseline measurements of Young's moduli resulted in values of 5636 plus or minus 486, 7714 plus or minus 505, and 8767 plus or minus 292 KSI for the 20 ga, 16 ga, and 12 ga. wires respectively.
Madaras, Eric I.↗
ATI SAA Annex 3 Button Tensile Test Report I
This report documents the results of a study carried out under Splace Act Agreement SAA-EA-10-004 between the National Aeronautics and Space Administration (NASA) and Astro Technology Incorpporated (ATI). NASA and ATI have entered into this agreement to collaborate on the development of technologies that can benefit both the US government space programs and the oil and gas industry. The report documents the results of a test done on an adnesive system for attaching new monitoring sensor devices to pipelines under Annex III of SAA-EA-10-004: "Proof-of-Concept Design and Testing of a Post Installed Sensing Device on Subsea Risers and Pipelines". The tasks of Annex III are to design and test a proof-of-concept sensing device for in-situ installation on pipelines, risers, or other structures deployed in deep water. The function of the sensor device is to measure various signals such as strain, stress and temperature. This study complements the work done, in Annex I of the SAA, on attaching a fiber optic sensing device to pipe via adhesive bonding. Both Annex I and Annex III studies were conducted in the Crew and Thermal System Division (CTSD) at the Johnson Space Center (JSC) in collaboration with ATI.
Tang, Henry H.↗