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.
||1 April 2013
|PDF File Size:
|ePub File Size:
||Free* [*Free Regsitration Required]
The components of variance for Elmendorf tear strength expressed as standard deviations were calculated to be the values listed in Table 3.
ASTM D Tearing Strength of Fabrics by Falling-Pendulum (Elmendorf-Type) Apparatus_百度文库
Align, if necessary, by turning the leveling thumb screw at the left end of the tester base. Using care and without touching the sensor, vacuum away any loose? If the pendulum stop height is changed, verify clamp alignment and zero position. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Before a meaningful statement can be made about two speci? Preferably the clamps may be air actuated, but manual clamping is permitted.
If the pointer friction does not lie between two and three divisions, remove the pointer, wipe the bearing clean, and apply a trace of clock oil to the groove of the bearing. 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. Remove the jaw spacer gage.
Avoid getting oil, water, grease, etc. We offer machines, apparatus, testers, tensile d11424, test fixtures, clamps, holders, jigs, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and custom solutions for unique applications. D — 09 The pointer, or when satm, the digital readout should read Reassemble and check pointer friction. NOTE 2—An adequate speci? COF Inclined Plane Tester Measure the static coefficient of friction of various materials using a variable inclined plane and a sliding block.
Thickness micron testing equipment with Resolution 0. 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. This standard is subject to revision at any time by the responsible technical committee and must be v1424 every? Instructions are provided for testing specimens with, or without, wetting.
Loosen d424 shoulder head screw on top of the pendulum support. If zero is not registered, the pointer stop should be adjusted until the zero reading is obtained, otherwise service as directed in Annex A1.
It measures the amount of energy required to perform the tearing operation by measuring the peak follow-through angle of the pendulum after the tearing action.
Larger differences are likely to occur under all other circumstances. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. Have a question about conducting the test for this standard? Your comments will receive careful consideration at a meeting atm the responsible technical committee, which you may attend. Apply a small amount of graphite from an ordinary lead pencil to the cutting knife or the edge of the die used for cutting the slit so that when the cut is made some of the graphite transfers to the paper; this serves to contrast the cut from the uncut portion of the paper and facilitates the measurement.
The Online Industrial Exhibition. If a smooth release cannot be obtained by this adjustment the pendulum or the pendulum stop may require repair or replacement. This precaution is most important when testing bowed fabrics. The fabric specimen is In any event, do not change the level of d14224 instrument to adjust the zero. One of the variables in Elmendorf tear testing is the orientation of the fabric. D1244 tests as directed in 5.
In the absence of other criteria, such as in a material speci? Recheck zero and readjust the pointer stop if necessary. Statistical assistance is recommended for the investigation of bias.
ASTM D1424 Tearing Strength of Fabrics by Falling-Pendulum Type (Elmendorf) Apparatus
Gently push the pendulum in until the jaw spacer gage r1424 just enough clearance to slide out the top of the clamps. See Test Methods D and D The Elmendorf test testing machine uses a falling pendulum to tear a fabric specimen. A number in parentheses indicates the year of last reapproval. 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.
Four of the eight asttm were tested on one day and four specimens were tested on a second day. Analysis of the data was conducted using the Practice D and Practice D For most fabrics this time period will be about 1 h. Close the clamps, securing the specimen with approximately the same tension on both clamps. Ensure the gage is positioned with the wide dimension upwards and the projection extending over the edge of the stationary clamp far enough such that the knife can be adjusted 6 to the bottom edge of the gage.
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.