Modeling unidirectional composites by bundling fibers into strips with experimental determination of shear and compression properties at high pressures

Chocron, Sidney; Nicholls, Arthur E.; Brill, A.; Malka, Alon; Namir, Tal; Havazelet, D.; Werff, H. van der; Heisserer, Ulrich; Walker, James D.

doi:10.1016/j.compscitech.2014.06.016

Cited by 62 publications

(50 citation statements)

References 14 publications

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“…These were compared to the predictions from theory and the tests performed in [6]. The results were very satisfactory as shown in [3].…”

Section: Numerical Model Of the Stripmentioning

confidence: 93%

“…The normal stress to failure selected was 1 GPa and the shear stress 10 MPa. These numbers on their own might seem completely unrealistic but, the shear and delamination tests under high pressure confinement provide similar numbers [3].…”

Section: Numerical Model Of the Single Layermentioning

confidence: 99%

“…This was done both for woven composites (Kevlar/Epoxy [2], S-2 glass/Epoxy) and for unidirectional systems (Polyethylene/Polyurethane) [3]. Again the models were able to predict qualitatively deformation and failure patterns, and quantitatively deflection and ballistic limits.…”

Section: Introductionmentioning

confidence: 99%

“…The material tests consisted of: lap shear, torsion, and in-plane and out-of-plane compression tests. The lap-shear and compression tests were performed at atmospheric and high (500 MPa) confinement pressures and were presented in [3]. Characterization of the material at high pressures is thought to be essential as the projectile penetrating the laminate is exerting high pressure through the thickness.…”

Section: Materials Tests Performedmentioning

confidence: 99%

“…This is only a rough approximation to the real material where the matrix is homogenously distributed among the fibers. The resin was assumed to be a homogenous isotropic material with a density of 0.97 g/cm 3 and elastic perfectly plastic (Young's modulus 70 MPa, Poisson's ratio 0.45, strength 04048-p.3 EPJ Web of Conferences 3.5 MPa, and failure at an effective plastic strain of 10%). Transverse impact simulations on the strip were performed at different velocities to check the strain, the transverse wave velocity, and the critical velocity (impact velocity that fails immediately the fibers).…”

Section: Numerical Model Of the Stripmentioning

confidence: 99%

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Transitioning a unidirectional composite computer model from mesoscale to continuum

Chocron

Zaera

Walker

et al. 2015

EPJ Web of Conferences

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Abstract. Ballistic impact on composites has been a challenging problem as seen in the abundant literature about the subject. Continuum models usually cannot properly predict deflection history on the back of the target while at the same time giving reasonable ballistic limits. According to the authors the main reason is that, while continuum models are very good at reproducing the elastic characteristics of the laminate, the models do not capture the behaviour of the "failed" material. A "failed" composite can still be very effective in stopping a projectile, because it can behave very similar to a dry woven fabric. The failure aspect is much easier to capture realistically with a mesoscale model. These models explicitly contain yarns and matrix allowing the matrix to fail while the yarns stay intact and continue to offer resistance to the projectile. This paper summarizes the work performed by the authors on the computationally expensive mesoscale models and, using them as benchmark computations, describes the first steps towards obtaining more computationally effective models that still keep the right physics of the impact.

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“…These were compared to the predictions from theory and the tests performed in [6]. The results were very satisfactory as shown in [3].…”

Section: Numerical Model Of the Stripmentioning

confidence: 93%

Section: Numerical Model Of the Single Layermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Materials Tests Performedmentioning

confidence: 99%

Section: Numerical Model Of the Stripmentioning

confidence: 99%