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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The values stated in inch-pound units may be approximate. Subscribe to Our Newsletters. 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. Subscribe to Instron News! Avoid getting oil, water, grease, and so forth, on the specimens when handling. Typically for woven fabrics, if a small decrease in force d587 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.
The challenges of testing to this standard are: Ensure specimens are free of folds, creases, or wrinkles. Bluehill LE for Basic Testing.
If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted s5587 consideration of the known bias. The force to continue the tear is calculated from autographic chart recorders or microprocessor data collection systems. Some modification of clamping techniques may be necessary atm a given fabric, depending upon its structure.
Current edition approved Feb. While manual action grips will work, many prefer pneumatic side action grips for ease of use, productivity, and better repeatability.
ASTM D5587 Tearing Strength of Fabrics by Trapezoid Procedure
If any of these modications are used, state the method of modication in the report. This standard does not purport to address all of the safety concerns, if any, associated with its use. Instructions are provided for testing specimens with or without wetting. NOTE 2—The tabulated values of the critical differences should be considered to be a general statement, particularly with respect to betweenlaboratory precision.
A number in parentheses indicates the year of last reapproval. This standard mainly applies to most woven textile fabrics, but can be applicable to fabrics produced by other techniques. Software for Series Systems. Precision and Bias Take the specimens to be used for the measurement of the cross-machine direction with the longer dimension parallel to the crossmachine direction.
Adjustable grip pressure also allows users to fine-tune the gripping pressure to avoid jaw breaks or slippage. The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before testing is begun.
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. It is recognized that some constant-rate-of-traversetype CRT tensile testing machines continue to be used. 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. In some cases, due to fabric constructions, individual yarns may not rupture but show a high peak and yarn distortion within the test specimen.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
ASTM D – 15 Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: There may be no overall correlation, however, between the results obtained with the CRT-type machine and the CRE-type machine. The values stated in inch-pound wstm may be approximate.
Sampling and Test Specimens 7. The separation of the jaws is increased continuously to apply a force to propagate the tear across the specimen.
Tear Strength of Fabrics – Trapezoid Procedure
Active view current version of standard. This test method allows the use of the CRT-type tensile machine when agreed upon between the purchaser and the supplier. The values stated in inch-pound units may be approximate. G Hydraulic Vice Action Grip. In any event, it is recommended that computer-processed data be veried against known property values and its software described in the report. Consider the rolls or pieces of fabric to be the primary sampling units.
Randomly assign the samples in equal numbers to each laboratory. The valleys recorded between the peaks have no specic signicance. Perform the test within 2 min after removal of the specimen from the water. How can we help you? Have a question about conducting the test for this standard?
It is important to review ASTM D in order to fully understand the test setup, procedure, and results requirements. Consequently, these two tensile testers cannot be used interchangeably unless the degree of quantitative correlation has been established between the purchaser and the supplier.
Link to Active This link will always route to the current Active version of astj standard. Disengage the pawls from the rachet to render them inoperative. It is the responsibility of the user asfm this standard to ast appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This standard is subject to revision at any time by the responsible technical committee aztm must be reviewed every ve years and if not revised, either reapproved or withdrawn. Consequently, these two tensile testers cannot be used interchangeably unless the degree of quantitative correlation has been established between the purchaser and the supplier.
We are confident that we have what you are looking for. The valleys recorded between the peaks have no specific significance. Concrete, Asphalt and Rock.