By P Schwartz
This ebook discusses facets of material constitution and mechanical homes similar to tensile, bending and shear houses for quite a number materials. It illustrates the position of material constitution and mechanics and examines the structural, tensile, bending and shear houses of woven, knitted and nonwoven materials. The ebook then experiences the constitution and mechanics of yarns, covered materials, 2nd and 3D cloth composites. It additionally explores checking out equipment for the size of material mechanical houses and constitution parameters.
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Extra info for Structure and Mechanics of Textile Fibre Assemblies (Woodhead Publishing in Textiles)
Sample text
This grouping of threads is made easier if the yarns are smooth and can slip over each other. Special fabric finishes such as some crease-resistant finishes, which cause the yarns to adhere to one another, may reduce the tearing strength. The effect of the weave structure is also evident. Thus, a twill weave allows the threads to group better than a plain weave; hence, a twill weave will exhibit better resistance to tearing than a plain weave. Textured fabrics inhibit thread movement and reduce thread grouping and tear strength.
3). The highest peaks are thought to reflect the strength of the yarn components (woven fabrics), fiber bonds or fiber interlocks (nonwoven fabrics), individually or in combination, needed to stop a tear in a fabric of the same construction. The peaks that are seen on the load-extension curve (N-mm) are more often from the breaking of a group of threads than from the individual ones. It is interesting to point out that a similar tear morphology is observed on the fracture surface of rubber and it is called stick-slip tear.
The falling pendulum (Elmendorf) apparatus can be used to measure the tearing strength of most nonwoven fabrics, provided the fabric does not tear in the direction crosswise to the direction of the force applied during the test. If the tear does not occur in the direction of the test, the fabric is considered untearable in that direction by this test method. f. For tearing strength above this value, a high capacity test instrument is available equipped with augmenting weights to increase the capacity.