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|Title:||Perforation of woven fabric by spherical projectiles|
|Authors:||Shim, V.P.W. |
|Source:||Shim, V.P.W.,Tan, V.B.C.,Tay, T.E. (1995). Perforation of woven fabric by spherical projectiles. American Society of Mechanical Engineers, Applied Mechanics Division, AMD 205 : 453-466. ScholarBank@NUS Repository.|
|Abstract:||Rectangular specimens of Twaron fabric, clamped on two opposite sides, are subjected to impact perforation by 9.5 mm diameter spherical steel projectiles at speeds ranging from 140 m/s to 420 m/s. This plain woven fabric, comprising PPTA (poly-paraphenylene terephthalamide) fibers, is commonly employed in flexible armor applications. Its perforation response is examined in terms of residual velocity, energy absorbed and resulting deformation patterns. The existence of a critical or transition impact velocity, beyond which there is a significant reduction in energy absorbed by perforation, is observed. Differences in creasing and deformation induced in specimens are also demarcated by this transition impact velocity. Effects of difference in boundary conditions (clamped and free) on yarn breakage are also noted. A numerical model, based on an initially orthogonal network of pin-jointed bars interconnected at nodes, is formulated to simulate the fabric. Fiber yarn mechanical properties are represented via a three-element spring-dashpot model which encapsulates viscoelastic behavior and fiber failure. Numerical results exhibit good correlation with experimental observations in terms of prediction of threshold perforation velocity, energy absorbed, occurrence of a transition critical velocity and fabric deformation characteristics.|
|Source Title:||American Society of Mechanical Engineers, Applied Mechanics Division, AMD|
|Appears in Collections:||Staff Publications|
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