scholarly journals Strength, Fatigue Strength and Stiffness of High-Tech Bamboo/Epoxy Composites

2014 ◽  
Vol 05 (13) ◽  
pp. 1281-1290 ◽  
Author(s):  
Michael James Platts
Keyword(s):  
Fatigue Strength ◽  
Epoxy Composites ◽  
High Tech ◽  
Strength And Stiffness

Parametric Design of Blisk Repairs by Patching Considering High Cycle Fatigue

2019 ◽  
Author(s):  
Ricarda Berger ◽  
Benedikt Hofmeister ◽  
Cristian G. Gebhardt ◽  
Raimund Rolfes
Keyword(s):  
Fatigue Strength ◽  
High Cycle Fatigue ◽  
Search Algorithm ◽  
Fatigue Behaviour ◽  
Pattern Search ◽  
High Tech ◽  
Cycle Fatigue ◽  
Welding Seam ◽  
Patch Model ◽  
Patch Geometry

Abstract Advanced repair techniques intended for jet engine parts are continuously under development and improvement. Patching is a high-tech approach towards reduced scrap rates and an extended life of high pressure compressor blisks. In this work, we contribute to the structural design of patches for compressor blisks with improved high cycle fatigue behaviour. A fully parameterised patch model is developed, which allows the accurate description of the patch geometry. High cycle fatigue is assessed for welding seam positions specified by the patch model. On the basis of this automated process, a multi-objective optimisation is carried out. The fatigue strength and the length of the welding seam are defined as conflicting targets. Pareto-optimal solutions are calculated using a generalised pattern search algorithm. The engineer’s decision for a specific patch geometry can thus be made based on the optimisation results. The application of the new approach to a compressor blisk demonstrates the influence of vibration modes on fatigue strength. We identify sets of optimal suited patch geometries in accordance to the specified damage pattern.

scholarly journals Influence of Ply Sequence on the Elastic Properties of Laminated Composites

2009 ◽  
Vol 18 (5) ◽  
pp. 096369350901800
Author(s):  
A.M. Amaro ◽  
F.V. Antunes ◽  
A. Ramalho
Keyword(s):  
Elastic Properties ◽  
Material Parameter ◽  
Laminated Composites ◽  
Epoxy Composites ◽  
Dynamic Loads ◽  
Stacking Sequence ◽  
Specific Strength ◽  
Stiffness Properties ◽  
Strength And Stiffness

Composite materials are mostly submitted to dynamic loads, because of their excellent specific strength and stiffness, therefore the resonant technique is adequate for the determination of stiffness properties. Three plates of similar carbon-epoxy composites with distinct fibre orientations were studied with this technique. The effect of stacking sequence on the rigidity of laminated composites was investigated A significant influence of this material parameter on in-plane elastic properties was found, allowing optimization of stiffness for a particular application.

scholarly journals Influence of water on tensile and fatigue strength of angle-ply aramid/epoxy composites.

1989 ◽  
Vol 38 (434) ◽  
pp. 1329-1335 ◽  
Author(s):  
Kenjiro KOMAI ◽  
Sohei SHIROSHITA ◽  
Sadamu KINOSHITA ◽  
J. GRENESTEDT
Keyword(s):  
Fatigue Strength ◽  
Epoxy Composites ◽  
Influence Of Water

UNIDIRECTIONAL KEVLAR 49 ARAMID REINFORCED EPOXY COMPOSITES

Alloy Digest ◽  
1990 ◽  
Vol 39 (4) ◽  
Keyword(s):  
Shear Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
Epoxy Composites ◽  
Low Density ◽  
High Modulus ◽  
Advanced Composites ◽  
Strength And Stiffness ◽  
Reinforcing Fiber

Abstract KEVLAR 49 is a high-modulus para-aramid reinforcing fiber. It is the dominant organic reinforcing fiber in advanced composites today. It has exceptional strength and stiffness and it is a low density material. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and compressive and shear strength as well as creep. It also includes information on machining. Filing Code: Cp-7. Producer or source: E. I. Dupont de Nemours & Company Inc..

Sign in / Sign up

Export Citation Format

Share Document