In order to calculate the specimen puncture resistance, the specimen is first stretched and placed on the ring clamp mechanism of the puncture fixture. Comfort Stretch and Mechanical Stretch: The common testing methods of breaking strength include reveled-strip method, grab method, shear strip method. A typical tensile test clamps the end of the specimen, which is effective when testing metals, plastics, and other traditional solid materials. This test method applies to most fabrics such as woven fabrics, air bag fabrics, blankets, napped, knitted, layered, and pile fabrics.
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Tips on citation download. At a minimum, the two parties should take a group of test specimens which are as homogeneous as possible and which are from a lot of material of the type in question. 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 in light of the known bias. The average results from the two laboratories should be compared using Student's t -test for unpaired data and an acceptable probability level chosen by the two parties before the testing began. The predicted results are compatible with the measured values, suggesting that the theoretical model is capable of estimating the tensile strength of a grab specimen. On those fabrics, the contraction effect cited in 1.
NPTEL :: Textile Engineering - Textile Testing
From knowledge of the specimen dimensions, the load and deflection data can be translated into a stress—strain curve. Shear strength of fibrous sheets: Subscribe to this journal. The tensile stress—strain curves for longitudinal and transverse specimens are shown in Figure However, waisting unidirectional material, with all the fibers in the test direction, frequently leads to shear stress failure at the waists. GK Mechanical Vice Grip.
In model A, three cell wall layers are taken into account by using a laminated plate model where a natural fibre cell is considered as antisymmetrical laminated structure. Analysis of this curve leads to several useful mechanical measurements. Recent Posts How many documents do you need to compliance your factory in Bangladesh. Our engineers are ready to help you! For a strip test, the grips clamp a strip of fabric using jaws wider than the sample width. Picture 2 For the testing of woven fabrics, the reveled-strip method is used frequently. Hunter, in Cotton ,