This standard is issued under the fixed designation D ; the number 1 This test method is under the jurisdiction of ASTM Committee D on Textiles. Jan 1, Buy ASTM D R TEST METHOD FOR TEARING STRENGTH OF FABRICS BY FALLING-PENDULUM (ELMENDORF-TYPE). The ASTM D Elmendorf based tear test is the most popular test for measuring the tearing strength of most fabrics. The Elmendorf test testing machine uses.
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Precision and Bias WAFT direction is perpendicular to the orientation of the weaving machine. When equipped, be careful not to disturb the position of the pointer. The calibrated mass shall be constructed such that the mass can be inserted in the clamps in the same manner as used for a fabric specimen.
ASTM D1424 Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Open the catalog to page 2. Ensure the black sensing strip on the pendulum is clean v1424 The Elmendorf test testing machine uses a falling pendulum to tear a fabric specimen.
Describe the fabric or product sampled and the method of sampling used. The pointer, or when equipped, the digital readout should read Apply a atsm amount of silicone grease to the air clamp plunger rods. The critical dimension of the test specimen is the distance If the pendulum stop height is changed, verify clamp alignment and zero position.
ASTM D Tearing Strength of Fabrics by Falling-Pendulum (Elmendorf-Type) Apparatus_百度文库
Woven fabrics are usually stronger in the WARP direction. The average results from the two laboratories should be compared using appropriate statistical analysis and an acceptable probability level chosen by the two parties before the testing began. These dies can be made to order by most die manufacturers. Gently push the pendulum in until the jaw spacer gage has just enough clearance to slide out the top of the clamps. It is not suited for the course direction of warp knit fabrics or either direction of most other knitted fabrics.
This requires quantification of the tearing strength of the fabric in the test lab. The components of variance for Elmendorf tear strength expressed as standard deviations were calculated to be the values listed in Table 3.
See Annex A1, if adjustment is required. WARP direction of the fabric is in line with the weaving machine. See Test Methods D and D Record values as read from the direct reading scale to the nearest mN gf. Visually check the alignment of the clamps.
Seal Strength system to test 3 sides seal bags. Perform the test within 2 min after removal dd1424 the specimen from the water. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The test specimens should then be randomly assigned in equal numbers to each laboratory for testing.
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Before a meaningful statement can be made about two speci? Your comments are invited either d14244 revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Larger differences are likely to occur under all other circumstances. If a smooth release cannot be obtained by this adjustment the pendulum or the pendulum stop may require repair or replacement. With the jaw spacer in place, tighten the shoulder head screw on the pendulum support. Press and hold down the pendulum stop and let the pendulum swing freely.
ASTM D Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
The three woven fabric types were: Within this limitation, Test Method D has no known bias. Consequently no multi-fabric comparisons were made. The Online Industrial Exhibition. Make this measurement either with a precision steel rule graduated in 0. Summary of Test Method 4. If the knife cannot be positioned centrally, replace one or any combination of: Instructions are provided for testing specimens with, or without, wetting.
The falling pendulum propagates this pre-notch to a complete tear through the center of the fabric specimen. Astj the jaw spacer gage. Label to maintain specimen identity. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of fabric of the type in question.
Adjust the height of the pendulum stop until a smooth release is obtained.
With both clamps in the open position, gently pull the pendulum out until the jaw spacer gage will? D — 09 If the knife is dull it will produce a V-notch near the top of the cut and push the material outward. Thickness micron testing equipment with Resolution 0.
The distance between the axis and the top edges of the clamping jaws is 0. Ensure that there is no perceptible movement of the tester base or bench during the swing of the pendulum.