scholarly journals Fabrication, characterization and low-velocity impact testing of hybrid sandwich composites with polyurethane/layered silicate foam cores

2010 ◽  
Vol 32 (1) ◽  
pp. 6-13 ◽  
Author(s):  
James Njuguna ◽  
Sławomir Michałowski ◽  
Krzysztof Pielichowski ◽  
Kambiz Kayvantash ◽  
Andrew C. Walton
Keyword(s):  
Layered Silicate ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Sandwich Composites ◽  
Low Velocity ◽  
Velocity Impact

Low Velocity and Compression-After-Impact Response of Pin-Reinforced Sandwich Composites

1999 ◽  
Author(s):  
Uday K. Vaidya ◽  
Mohan V. Kamath ◽  
Mahesh V. Hosur ◽  
Anwarul Haque ◽  
Shaik Jeelani
Keyword(s):  
Impact Testing ◽  
Low Velocity Impact ◽  
Sandwich Composites ◽  
Low Velocity ◽  
Static Compression ◽  
Velocity Impact ◽  
Transverse Stiffness ◽  
Impact Studies ◽  
Compression After Impact ◽  
The Impact

Abstract In the current work, sandwich composite structures with innovative constructions referred to as Z-pins, or truss core pins are investigated, in conjunction with traditional honeycomb and foam core sandwich constructions, such that they exhibit enhanced transverse stiffness, high damage resistance and furthermore, damage tolerance to impact. While the investigations pertaining to low velocity impact have appeared recently in Vaidya et al. 1999, the current paper deals with compression-after-impact studies conducted to evaluate the residual properties of sandwich composites “with” and “without” reinforced foam cores. The resulting sandwich composites have been investigated for their low velocity (< 5 m/sec) impact loading response using instrumented impact testing at energy levels ranging from 5 J to 50 J impact energy. The transverse stiffness of the cores and their composites has also been evaluated through static compression studies. Compression-after-impact studies were then performed on the sandwich composites with traditional and pin-reinforcement cores. Supporting vibration studies have been conducted to assess the changes in stiffness of the samples as a result of the impact damage. The focus of this paper is on the compression-after-impact (CAI) response and vibration studies with accompanying discussion pertaining to the low velocity impact.

scholarly journals Low Velocity Impact and Creep-Strain Behaviour of Vinyl Ester Matrix Nanocomposites Based on Layered Silicate

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
A. I. Alateyah ◽  
H. N. Dhakal ◽  
Z. Y. Zhang ◽  
B. Aldousiri
Keyword(s):  
Electron Microscopy ◽  
Vinyl Ester ◽  
Creep Behaviour ◽  
Layered Silicate ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Neat Polymer ◽  
Velocity Impact ◽  
The Impact

The impact properties of neat vinyl ester and the nanocomposites were performed using a low velocity impact testing. The addition of layered silicate into the polymer matrix shows that an optimum range of nanoclay reinforcement in the vinyl ester matrix can produce enhanced load bearing and energy absorption capability compared to the neat matrix. In addition, the amount of microvoids in the nanocomposites structure influences the overall properties. Likewise, the influence of the clay addition into the neat polymer on the creep relaxation behaviour at 25°C and 60°C was studied. In both cases, the presence of the layered silicate remarkably improved the creep behaviour. The improvement of these properties can be assigned to the stiff fillers and the configurational linkage between the polymer and the layered silicate which are supported by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterisations by showing a distinct change in surface morphology associated with improved impact toughness and creep response.

Grid-Characteristic Numerical Method for Low-Velocity Impact Testing of Fiber-Metal Laminates

2018 ◽  
Vol 39 (7) ◽  
pp. 874-883 ◽  
Author(s):  
K. A. Beklemysheva ◽  
A. V. Vasyukov ◽  
A. O. Kazakov ◽  
I. B. Petrov
Keyword(s):  
Numerical Method ◽  
Impact Testing ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Fiber Metal Laminates ◽  
Velocity Impact ◽  
Fiber Metal

The effect of low-velocity impact on the fatigue life of Sandwich composites

2005 ◽  
Vol 70 (3) ◽  
pp. 374-381 ◽  
Author(s):  
Brian Freeman ◽  
Eric Schwingler ◽  
Mohammad Mahinfalah ◽  
Ken Kellogg
Keyword(s):  
Fatigue Life ◽  
Low Velocity Impact ◽  
Sandwich Composites ◽  
Low Velocity ◽  
Velocity Impact
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