Characterisation and numerical simulation of twill and satin weaves of fabrics made of p-Aramid under static and dynamic loading

Boljen, Matthias; Harwick, W.; Rohr, I.; Hiermaier, Stefan

doi:10.1051/jp4:2006134053

Cited by 3 publications

(2 citation statements)

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“…The published record of ballistic testing of nonplain weaves may be characterized as sporadic; only recently has experimental research [25,26] attempted to systematically isolate the effects of weave type on ballistic performance. Computational research on nonplain weaves has been similarly limited; although computational models quantifying the geometry, strength, and stiffness of nonplain weaves have been developed [27][28][29] and seen limited application in ballistics [30] and impact dynamics [31], it appears that no previous work has developed and validated a thermodynamically consistent yarn-level computational model of the ballistic performance of nonplain weaves. Despite the limited scope of previous research, expanded investigation of nonplain weaves is well motivated.…”

Section: Introductionmentioning

confidence: 99%

Impact Dynamics Simulation for Multilayer Fabrics of Various Weaves

Shimek

Fahrenthold

2015

AIAA Journal

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The high strength, light weight, and flexibility of fabric protection systems makes them an effective impact mitigation solution in some important engineering applications. Examples include body armor, fan blade containment systems, and orbital debris shielding. Most soft armor protection systems employ a plain weave fabric, suitable for use in flat or slightly curved geometries. However, future fabric protection system designs may employ nonplain weaves to protect highly curved surfaces (such as personnel extremities) or to optimize the performance of protection systems composed of a nonhomogeneous fabric stack. In recent research, the authors developed an improved hybrid particle-element method to simulate the ballistic impact performance of fabric protection systems. The new formulation is the first to address the full range of modeling issues (including penalty-based contact-impact, excessive yarn bending stiffness, and mass or energy discard) that have limited the effectiveness of legacy finite element-based fabric modeling methods for over two decades. Validation simulations modeled three-dimensional perforation dynamics in multilayer fabric stacks, and showed good agreement with new ballistic experiments conducted at three different target-layer counts for two different projectile types and four different weaves. Nomenclature= second Euler parameter coefficient matrix g = generalized nonconservative torque, N · m g e = contact-impact torque, N · m g v = viscous torque, N · m H = semiaxis scaling matrix, m −2 H = transformed semiaxis scaling matrix, m −2 i = vector component i i = particle or element i i; j = particle combination i, j J = moment of inertia matrix, kg · m 2 m = particle mass, kg m p = projectile mass, kg N = number of connected neighbor particles n = number of particles n w = number of particles spanning a yarn P = pressure, Pa q d = generalized nonconservative force, J q p = generalized nonconservative force, J q U = generalized nonconservative force R = rotation matrix r o = element reference length, m s = element length, m s o = element length in the reference configuration, m T = kinetic coenergy, J t = fabric thickness, m U = internal energy, J u = internal energy per unit mass, J · kg −1 u s = step function V = potential energy, J= generic vector in the fixed framê v = generic vector in the corotating frame w = yarn width, m Y = yield stress, Pa Y o = reference yield stress, Pa α = particle semiaxis scaling factor β t = transition particle stretch factor Γ d = damage strain energy release rate, J Γ p = plastic strain energy release rate, J γ = first Euler angle δ ij = Kronecker delta ϵ = total strain ϵ p f = plastic failure strain ϵ e = elastic strain ϵ p = plastic strain ζ = ellipsoidal coordinate ζ R = reference ellipsoidal coordinate η = heat transfer coefficient, J · s −1 · K −1 η p = thermal softening coefficient, K −1 θ = third Euler angle (without superscript) θ = temperature (with superscript), K θ m = melt temperature, K θ o = reference temperature, K θ H = homologous temperat...

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Section: Introductionmentioning

confidence: 99%

Impact Dynamics Simulation for Multilayer Fabrics of Various Weaves

Shimek

Fahrenthold

2015

AIAA Journal

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“…The numerical model developed here has been validated against experimental impact data for both aramid and ultra high molecular weight polyethelene fabric targets. Future work may include extension of the geometric model to represent non-plain weaves; although recent research [50] has attempted to model the quasi-static mechanical response of non-plain weaves, no previous work has attempted to predict the ballistic response of non-plain weave soft armor materials.…”

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confidence: 98%

Impact dynamics simulation for multilayer fabrics

Rabb

Fahrenthold

2010

Numerical Meth Engineering

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SUMMARYHigh-strength fabrics are employed in a wide range of ballistic protection and blast mitigation applications. They are normally used in a multilayer configuration. General numerical models of impact, perforation, and fragmentation processes in multilayer fabrics must account for complex contact-impact dynamics and include general thermomechanical coupling. A hybrid particle-element formulation has been developed to simulate impact and perforation in plain weave fabrics. Simulation results show good agreement with experiment, for fragment simulating projectile impacts on both aramid and ultra high molecular weight polyethelene soft armor materials.

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Effects of Weave Type on Ballistic Performance of Fabrics

Shimek

Fahrenthold

2012

AIAA Journal

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Characterisation and numerical simulation of twill and satin weaves of fabrics made of p-Aramid under static and dynamic loading

Cited by 3 publications

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Impact Dynamics Simulation for Multilayer Fabrics of Various Weaves

Impact Dynamics Simulation for Multilayer Fabrics of Various Weaves

Impact dynamics simulation for multilayer fabrics

Effects of Weave Type on Ballistic Performance of Fabrics

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