D / DM() Standard Test Method for Tensile Properties of Yarns by the Single-Strand Format, Pages, Price. PDF ASTM License Agreement. This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D13 on Textiles. ASTM D – Tensile Properties of Yarns by the Single Strand Method. Scope: This test is used to determine the Breaking Force and Elongation of yarns.

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    Astm D2256 Pdf

    Home; ASTM D/DM(). $; Add to Cart. Printed Edition + PDF; Immediate download; $; Add to Cart. ASTM D/DM Standard Test Method for Tensile Properties of Yarns by the Single-Strand A1 of Test Method D is considered satisfactory for acceptance testing of commercial shipments because the PDF (Personal Use) . ASTM International. (). Standard. Test Method for Tensile Properties of. Yarns by the Single-Strand Method1,. ASTM D West Conshohocken.

    However, this statement is not applicable to knot and loop breaking force tests, tests on wet specimens, tests on oven-dried specimens, or tests on specimens exposed to low or high temperatures and should be used with caution for acceptance testing because factual information on between-laboratory precision and bias is not available. As a minimum, use the samples for such a comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias. Initial modulus is a measure of the resistance of the yarn to extension at forces below the yield point. The chord modulus is used to estimate the resistance to imposed strain. The breaking toughness is a measure of the work necessary to break the yarn.

    Consequently, one of the current major challenges of FDM is to increase the available palette of materials. The latter should yield improvements in the ease of printing, e. Polymer-based composites and nanocomposites seem particularly suitable for this purpose, and are, thus, the focus of substantial research efforts see, for example, a recent review in Reference [ 10 ].

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    Also, the electrical resistivity of the composite was strongly decreased by the addition of CNT; however, 3D printing led to a partial deterioration of this behavior [ 13 ]. Adding carbon fillers to polybutylene terephthalate PBT and polyamide 12 PA12 filaments led to better mechanical and transport properties [ 18 , 19 ]. Recently, research was also directed toward the use of high-temperature engineering polymers in FDM.

    Also read: ASTM F2054 EBOOK

    Polyetheretherketone PEEK combines excellent mechanical properties, good chemical resistance, and a high glass-transition temperature. Experimental evidence showed that, provided the operating conditions are set adequately, PEEK is quite suitable for FDM articles [ 20 , 21 , 22 ] and references therein , and compares favorably with other materials such as PC and ABS [ 23 , 24 ].

    Physical Testing - Textile Technology Center

    For example, very recently, PEEK was successfully used to print a custom-designed rib prosthesis, and the mechanical behavior was found to be close to that of a natural rib [ 25 ]. Berretta et al. Specimen clamping may be modified as required at the discretion of the individual laboratory providing a representative force-elongation curve is obtained.

    In any event, the procedure described in this test method for obtaining tensile properties must be maintained. It provides an indication of the likely stretch behavior of garment areas such as knees, elbows, or other points of stress.

    It also provides design criteria for stretch behavior of yarns or cords used as reinforcement for items such as plastic products, hose, and tires. Elongation in knot or loop tests is not known to have any significance and is not usually reported.

    Single Yarn Strength Tester TY400

    When tensile tests are performed at a fixed time-to-break, then reasonable agreement in breaking force has generally been found to exist between CRT and CRE tension testing machines. See 9. The difference in breaking force between tests at 17 and 23 s will usually not exceed 1.

    The CRE-type tester is the preferred tension testing machine.

    ASTM D2256/D2256M - 10(2015)

    See 9. The difference in breaking force between tests at 17 and 23 s will usually not exceed 1.

    These alternative rates may be used only by agreement between the parties concerned or when required in an applicable material specification. Wet tests are made on flax yarns to detect adulteration by failure to show a gain in breaking force.

    Note that results obtained when testing oven-dried specimens at standard temperature will not necessarily agree with the results obtained when testing oven-dried yarns at high temperatures. Low-temperature tests are made on coated yarns used in the manufacture of materials used in outdoor applications, such as screening fabrics. Scope 1.

    The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

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