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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The lower the follow-through angle the more energy has been transferred into tearing the specimen. 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. Raise the pendulum to its cocked position. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.
The falling pendulum propagates this pre-notch to a complete tear through the center of the fabric specimen.
Visually check the alignment of the clamps. D — 09 The resistance to tearing is in part factored into the scale reading of the instrument and is computed from this reading and the pendulum capacity.
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Consequently no multi-fabric comparisons were made.
Tensile Tester for both compression and tensile, with loads typically N. If the knife cannot be positioned centrally, replace one or any combination of: Otherwise, discard the specimen and replace with another one.
The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. With the jaw spacer in place, tighten the shoulder head screw on the pendulum support.
Open the catalog to page 2. When equipped, set the pointer against its stop. Do not oil the? This standard has been approved for use by agencies of the Department of Defense.
Describe the fabric or product sampled and the method of sampling used. Do not change the level to adjust the zero. The clamping surface in each jaw is at least 25 mm 1. Label to maintain specimen identity. Sampling and Test Specimens 7. Generally the bulk of the calibrated mass faces downward. When the knife is determined to be dull, sharpen it with a rough stone, alternately, continuing specimen knife cuts, until no V-notch is observed.
Link to Active This link will always route to the current Active version of the standard. 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.
Ensure that atm is no perceptible movement of the tester base or bench during the swing of the pendulum. Place the gage in the stationary specimen clamp in the usual manner for testing fabric.
ASTM D1424 Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
Ensure specimens are free of folds, creases, or wrinkles. Movement of the instrument during the swinging of the pendulum is a signi? Ensure the black sensing strip on the pendulum is clean of? If zero is not registered, the pointer stop should be adjusted until the zero reading is obtained, otherwise service as directed in Annex A1. If necessary, adjust the height of the knife. d144
ASTM D Tearing Strength of Fabrics by Falling-Pendulum (Elmendorf-Type) Apparatus_百度文库
Instructions are provided for testing specimens with, or without, wetting. NOTE 7—The tabulated values of the critical differences should be considered to be a general statement, particularly with respect to betweenlaboratory precision.
It is not suited for the course direction of warp knit fabrics or either direction of most other knitted fabrics. Note when puckering occurs during the test. WAFT direction is perpendicular to the orientation of the weaving machine. Precision and Bias