Tear test of Fabric by trapezoid method to ASTM D ASTM D covers the measurement of the tearing strength of textile fabrics by the trapezoid tear test using a constant-rate-of-extension-type (CRE) tensile. ASTM D Tearing Strength of Fabric by. Trapezoid Procedure. • Scope – this test method describes the determination of the tearing strength of fabrics by the.
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Competent statistical assistance is recommended for the investigation of bias.
ASTM D – 15 Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
Avoid getting oil, water, grease, and so forth, on the specimens when handling. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
There may be no overall correlation, however, between the results obtained with the CRT-type machine and the CRE-type machine. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Strong fabrics or fabrics made from glass fibers require d55587 adaptation to prevent them from slipping in the clamps or being damaged as a result of being gripped in the clamps. If you have tried all of these steps and yarn distortion still occurs, this must be included in the report. In any event, the CRE-type machine shall prevail. Link to Active Astj link will always route to the current Active version of the standard.
The American Society for Testing d5857 Materials takes no position asgm the validity of any patent rights asserted in connection with any item mentioned in this standard. Give our test engineers a call today for help configuring the best test machine and accessories according to ASTM D The three woven fabric types were: A superscript epsilon e indicates an editorial change since the last revision or reapproval.
We offer machines, apparatus, testers, tensile grips, test fixtures, clamps, holders, jigs, faces, jaws, extensometers, environmental and humidity chambers, furnaces, baths and custom solutions for unique applications. It is useful for estimating the relative tear resistance of different fabrics or different directions in the same fabric. Make a preliminary cut 15 mm 0. Description Literature Contact Us This standard mainly applies to most woven textile fabrics, but can be applicable to fabrics produced by d55587 techniques.
The highest peaks appear to reflect the strength of the yarn components, individually or in combination, needed to stop a tear in fabrics of the same construction. The reported value obtained is not directly related to the force required to initiate or start a tear.
ASTM D – tearing strength of fabrics by the trapezoid procedure
Secure the emery cloth to the astk faces with pressuresensitive tape. Typically for woven fabrics, if a small decrease in force occurs at a time when the force is increasing, it is not considered to peak unless the indicated force exceeds the force required to break a yarn.
Preparation of Test Apparatus and Calibration 8. For fabrics not readily wet out with water, such as those treated with waterrepellent or water-resistant materials, add a 0. How can we help you?
Tear Strength of Fabrics – Trapezoid Procedure
Signicance and Use 5. The separation of the jaws is increased continuously to apply a force to propagate the aatm across the specimen. A rectangular specimen is marked and prepared so that it can be loaded in the grip faces at an angle, allowing a tear to propagate across the specimen.
D — 96 Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Bluehill LE for Basic Testing. It is recognized that some constant-rate-of-traverse-type CRT tensile testing machines continue to be used.
The reported zstm obtained is not directly related to the force required to initiate or start a tear. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. If more than 2 min elapse between taking the wet specimen from the water bath and starting the tension testing machine, discard the specimen and take another.
While manual action grips will work, many prefer pneumatic satm action grips for ease of use, productivity, and better repeatability. 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.
ASTM D5587 Tearing Strength of Fabrics by Trapezoid Procedure
G Hydraulic Vice Action Grip. By means of our testing expertise and modular product design, we will help find the solution that is right for you.
Consequently, these test instruments may be used when agreed upon between the purchaser and the supplier. In any event, it f5587 recommended that computer-processed data be veried against known property values and its software described in the report. 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.
Software for Series Systems. In the absence of such an agreement, take the number of fabric rolls specied in Table 1.
The nonparallel sides asym the marked trapezoid are clamped in parallel jaws of a tensile testing machine. At the same time, the force developed is recorded.
The minimum tearing force, d587, is indicated to be above the lowest valleys. The valleys recorded between the peaks have no specic signicance.
Four of the eight specimens were tested on one day and four specimens were tested on a second day. Within this limitation, this test method has no known bias. Have a question about conducting the test for this standard?
Instructions are provided for testing specimens with or without wetting. A number in parentheses indicates the year of last reapproval.