Numerical analysis of high velocity impacts on unidirectional laminates

Abstract

In this work a numerical methodology to predict the behavior of composite unidirectional laminates under high velocity impact is developed. In order to validate the model, experimental results of high velocity impacts of steel sphere against laminate coupons, were accomplished. The residual velocity in case of penetration and the damaged area in the panel are the variables chosen to validate the results obtained in the numerical methodology proposed. Finally an analysis of the influence of the projectile geometry is accomplished.

Investigation of mechanical impact behavior of short carbon-fiber-reinforced PEEK composites

“…For a better understanding of the impact processes in composite materials [51], two different regimes can be considered: impact velocities below and above ballistic limit bl V . When the 16 impact velocity is not high enough to perforate the composite, below ballistic limit, it is assumed that the plate absorbs all the kinetic energy of the projectile mainly in form of matrix cracking damage, Fig 11a. Low velocity impact involves a long contact time between the impactor and the target, which produces damage in some points far from the contact region (global structure deformation).…”

Cohesive zone models and impact damage predictions for composite structures

“…Usually, l cz;z ( l cz;zx and it is recommended to have at least two or three elements in the cohesive zone defined by l cz;z in order to capture the stress distribution in that zone. Linear exponential [153,199,233,234] Others: [229][230][231] High velocity impacts Bilinear: [272,273] Other: [274] Sandwich structures Bilinear: [282-285, 288, 295, 296] Others: [278,283,284,286,287,297,299] Crash absorbers for automotive applications…”

“…In a typical example, a 110 mm 9 110 mm plate with 12 layers and a total thickness of 2.4 mm was modeled by 3D solid elements with one element per layer and cohesive elements at each of the 11 interfaces [274]. A total of 270,000 elements were used in this model.…”

Effective modeling strategy for drop test analysis of composite curved beam

“…Studies on composite structures in the past decades have shown significant benefits of woven-fabric composite materials in enhancing the impact resistance of composite structures. Most of the experimental and numerical impact analyses, however, have been focused on two-dimensional composite plates either with unidirectional or woven fabric materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and little efforts are made for three-dimensional curved structures. To help contribute to a better understanding of the impact behavior of three-dimensional composite structures in general, this work provides experimental and computational drop test analyses of a woven fabric Eglass/E722 8HS composite curved beam.…”