Opportunities in Protection Materials Science and Technology for Future Army Applications (2011) / Chapter Skim
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Appendix J: Fiber-Reinforced Polymer Matrix Composites
Appendix J: Fiber-Reinforced Polymer Matrix Composites
Pages 150-156
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From page 150... ...
This appendix primarily addresses PMCs containing continuous fibers. The most common de DEFORMATION AND FAILURE MECHANISMS sign for PMCs is a laminate structure made of woven fabrics held together by a polymer resin.
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From page 151... ...
The yarns that the bullet directly contacts are called primary yarns; these yarns resist penetration and undergo deformation due to cone formation. The longitudinal compressive stress wave generated upon impact propagates outward along the yarn direction, forming a quasi-circular shape.
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From page 152... ...
The kinetic energy neat fabrics (including friction between yarns, between the of the cone is the major energy absorption factor, followed projectile and the yarn, and between the individual fibers) , the by deformation of the orthogonal yarns and tensile breakage only friction present in PMCs during impact occurs between of primary yarns; delamination and cracking provide only a the projectile and the laminate.
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From page 153... ...
Improved ballistic performance can be obtained by Material Properties using three-dimensional woven fabrics instead of two dimensional woven fabrics.20 Walter et al.21 quantitatively The properties of the fabrics, the surrounding matrix, and the interfaces affect the overall performance of analyzed results from three-dimensional woven glass-fiberlaminates. Although no thorough map of the effects of the reinforced composites and observed that delamination along properties of fabrics and polymer matrix has been drawn, an the weak layer is the most severe shortcoming in current examination of the experimental literature allows for some three-dimensional woven composites at high load and high preliminary conclusions.
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From page 154... ...
The thickness of the PMMA layers plays chanical properties that are much higher than those of the a critical role in the ballistic performance of PC/PMMA polymer laminates.32 The adhesion between PMMA and PC matrix. Because this mismatch can cause delamination and is strong enough to overcome delamination.33 In this case, cracking, which do not absorb as much kinetic energy as other modes of failure, or for other reasons relevant to the the mode of failure depends strongly on the thickness of the intended use of the product, polymer laminates that contain individual component layers.
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From page 155... ...
Further decreases in the laminates was attributed to the cooperative yielding of both thickness of the PMMA layer should produce better ballistic performance. 35The T-peel method is a way to measure the peel resistance of adhesives.
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