ASTM D5170 PDF
Designation: D – 98 (Reapproved ) Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners1 This. ASTM D Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners. ASTM D – Peel Strength (T Method) of. Hook and Loop Touch Fasteners. Scope: This test measures the peel strength of 2 strips of Hook and Loop material .
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Rated to N 50 lbf Maximum specimen thickness of 8 mm 0.
Calculate the average of the values from the four closures representing the four configurations. Last previous edition approved in as D – 98 If the document is revised or amended, you will be notified by email. This is a means of determining the resistance to f5170 when forces are applied normal to the line of separation of the fastener.
You may delete a document from your Alert Profile at any time. For materials greater than 1 in. Bias—The procedure in Test Method D for measuring the peel strength of hook and loop touch fasteners has no bias because the value of the peel strength of hook and loop asmt fasteners can be determined only in terms of a test method. This standard is not included in any packages. Prepare the fourth closure specimen as described in 8. If an integrator is used, set it such that the first and last inches of separation are not included in the results.
Mark five successive equal portions on the chart excluding the first and last inch of separation. For ASTM D, we would configure a small capacity load cell 10 or 25 pound for this low force peel test. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing.
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.
Place the free ends of the specimen to be tested in the clamps of the tester with the hook strip in the moving clamp. Calculate the average of these five highest values for each of the four specimens.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.
The integrator average is relatively easy atm calculate given the proper equipment. A jagged line having multiple peaks will be produced. This arrow is marked on the specimen on the leading end as it is unwound from the roll.
As a minimum, the two parties should take a group of test specimens which are as homogenous as possible and which are from a lot of hook and loop of the type in question. The average of the five highest peaks better reflect performance but the integrator results may be used to characterize a closure and for quality control purposes.
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Select a sample consisting of four contiguous specimens as described in 8. It shall be expressed in linear units of 10 yards m.
Make note on the recording chart of the test specimen number and atm number from Fig. In the sequence in which the closure specimens were prepared, select them for testing in the tensile tester. Your Alert Profile lists the documents that will be monitored. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
GK Mechanical Vice Grip. Remove the outer layer of each roll before selecting the required number of strips, hook and loop, 8 in.
Preparing the Specimens
You can download and open this file to your own computer but DRM prevents opening this file on asm computer, including a networked server. The four specimens of hook and loop selected will be used to characterize the peel strength of each of the configurations.
Label each specimen with the type of alignment for later reference. Create two samples of the hooks and loops going in the same direction ast, two going in the opposite direction see Figure 4 in official standard. This will create two free ends to be inserted into the tensile tester. The force registered in a peel test is irregular, and as a consequence, empirical methods have had to be developed to obtain usable values related to peel strength.
Position the clamps of the tensile tester so they are 1 6 1? ASTM D is a standard test method to measure peel strength of hook and loop fastners often times referred to as Velcro. Specimen Preparation Hook and loop material for this test shall be in the width as supplied, not to exceed 1 in.
A asmt lb load cell can be calibrated to measure 0. The peel plot will be an important aspect of data retrieval and therefore we highly recommend asym XyPlot software. As the voice of the U. This constitutes one cycle; a continuous uninterrupted back and forth motion of the roller, without lifting it from the material. In spite of the empirical nature of the reported values, it is believed they reflect comparative performance of similar touch fasteners tested and measured in the same way.
The hooks and loops in the material xstm different orientations, but the hook and loop connection is created to connect reliably regardless of the orientation. Sample Rolls—One roll shall be randomly selected from each linear unit 10 yards m. Your specimens should be 1 inch wide and 8 inches long. asttm