Transient Response of a Multi-layered Composite Rotating Airfoil Under Slicing-impact Loading

2013 ◽  
Author(s):  
Sunil K. Sinha
Keyword(s):  
Transient Response ◽  
Impact Loading ◽  
Layered Composite

Preliminary Assessment of the Influence of the Type of a Curing Agent upon Impact Loading of a Multi-Layered Composite

2014 ◽  
Vol 223 ◽  
pp. 19-26
Author(s):  
Paweł Przybyłek ◽  
Andrzej Komorek ◽  
Wojciech Kucharczyk
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Glass Fibre ◽  
Impact Loading ◽  
Layered Composite ◽  
Fibre Reinforcement ◽  
The Matrix ◽  
Curing Agents ◽  
Selection Of ◽  
Properties Of Composites

The properties of a multi-layered composite can be moulded through a selection of type, shape, and the number of layers of reinforcement material as well as powder fillers. Furthermore, the type and share of the matrix as well as the kind of hardeners also exert a significant influence on mechanical properties of composites. We attempted to experimentally establish the influence of the type of hardeners on mechanical properties. The test used Charpy’s hammer, and it was performed in the configuration of impact loading parallel to the edge. We prepared specimens of the materials. The specimens contained 12 layers of different fibre reinforcement: aramid (kevlar) fibre of 230 g/m2 basis weight, glass fibre of 150 g /m2, and carbon fibre of 160 g/m2 basis weight. The base was epoxy resin – Epidian 52, which was cured at room temperature by means of the following curing agents: PAC, TFF or Z-1, manufactured by Z. Ch. Organika-Sarzyna S.A. in Nowa Sarzyna. The experiments proved the tremendous influence of the type of the hardeners on toughness KC. It can be increased even by 25% for glass fibre reinforcement, about 20% for carbon fibre reinforcement and about 10% for aramid fibre reinforcement due to the use of an appropriate type of hardener.

scholarly journals Analysis of Layered Composite Beam to Underwater Shock Including Structural Damping and Stiffness Effects

2002 ◽  
Vol 9 (6) ◽  
pp. 283-291 ◽  
Author(s):  
S.W. Gong ◽  
K.Y. Lam
Keyword(s):  
Transient Response ◽  
Composite Beams ◽  
Layered Composite ◽  
Impulsive Loading ◽  
Computational Method ◽  
Structural Damping ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Coupled Equations ◽  
Underwater Shock

This paper deals with the transient response of layered composite beams subjected to underwater shock. The Doubly Asymptotic Approximation (DAA) method is employed in this study to treat the fluid-structure interactions. The effective structural damping and stiffness are formulated and incorporated in the fluid-structure-coupled equations, which relate the structure response to fluid impulsive loading and are solved using coupled finite-element and DAA-boundary element codes. The present computational method facilitates the study of transient response of the layered composite beams to underwater shock, involving the effects of structural damping and stiffness. In addition, the effect of free surface on the transient response of the layered beam to underwater shock is examined.

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