ASTM D3787-16(R2020) pdf free download

ASTM D3787-16(R2020) pdf free download.Standard Test Method for Bursting Strength of Textiles—Constant-Rate-of-Traverse (CRT) Ball Burst Test
1. Scope
1.1 This test method describes the measurement for bursting strength with a ball burst strength tester of textiles or garments that exhibit a high degree of ultimate elongation. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. N OTE 1—For the measurement of bursting strength with a hydraulic testing machine, refer to Test Method D3786. N OTE 2—Constant Rate ofTraverse (CRT) machines and Constant Rate of Extension (CRE) machines have been shown to provide different results. When using a CRE device, refer to Test Method D6797. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 For all terminology relating to D13.59, Fabric Test Methods, General, refer to Terminology D4850. 3.1.1 The following terms are relevant to this standard: bursting strength, constant–rate-of-traverse (CRT) tensile test- ing machine, fabric, knitted, fabric, nonwoven. 3.2 For all other terminology related to textiles, refer to Terminology D123.
4. Summary of Test Method
4.1 A specimen is securely clamped without tension be- tween grooved, circular plates of the ball burst attachment secured to the pulling (movable) jaw for the constant-rate-of- traverse (CRT) testing machine. A force is exerted against the specimen by a polished, hardened steel ball that is attached to the pendulum-actuating (fixed) clamp of the machine, until rupture occurs. 5. Significance and Use 5.1 This test method for the determination of ball bursting strength of textiles is being used by the textile industry for the evaluation of a wide variety of fabrics. 5.2 Test results obtained using the procedures in Test Method D3787 have not been correlated with actual perfor- mance. Test Method D3787 is considered satisfactory for acceptance testing of commercial shipments of textiles fabrics for bursting strength since the method has been used exten- sively in the trade for acceptance testing. In cases of disagree- ment arising from differences in values reported by the purchaser and the seller when using Test Method D3787 for acceptance testing, the statistical bias, if any, between the laboratory of the purchaser and the laboratory of the seller should be determined with comparison based on testing speci- mens randomly drawn from one sample of material of the type being evaluated. N OTE 3—The kind of force transfer and strength that occur when knitted goods are worn is prevented by clamping them as directed in this test method. 5.2.1 If there are differences of practical significance be- tween reported test results for two (or more) laboratories, comparative tests should be performed to determine if there is a statistical bias between them. The test samples used should be as homogeneous as possible, drawn from the material from which the disparate test results were obtained, and randomly assigned in equal numbers to the laboratories for testing. Other materials with established test values may be used for this purpose. The test results from the two laboratories should be compared using a statistical test for unpaired data at a probability level chosen prior to the testing series. If a bias is found, either the cause must be determined and corrected or future test results must be adjusted in consideration of known bias.