scholarly journals Composite Mechanics of Tire

2019 ◽  
Vol 92 (8) ◽  
pp. 302-308
Author(s):  
Yukio NAKAJIMA
Keyword(s):  
Composite Mechanics

Structural Response of Fiber Composite Fan Blades

1975 ◽  
Author(s):  
C. C. Chamis ◽  
M. D. Minich
Keyword(s):  
Quantitative Data ◽  
Fiber Composite ◽  
Structural Response ◽  
Aerodynamic Heating ◽  
Analysis Method ◽  
Centrifugal Forces ◽  
The Core ◽  
Composite Mechanics ◽  
Composite Blades ◽  
Load Conditions

A fiber composite airfoil, typical for high-tip speed compressor applications, is subjected to load conditions anticipated to be encountered in such applications, and its structural response is theoretically investigated. The analysis method used consists of composite mechanics embedded in pre- and post-processors and coupled with NASTRAN. The load conditions examined include thermal due to aerodynamic heating, pressure due to aerodynamic forces, centrifugal, and combinations of these. The various responses investigated include root reactions due to various load conditions, average composite and ply stresses, ply delaminations, and the fundamental modes and the corresponding reactions. The results show that the thermal and pressure stresses are negligible compared to those caused by the centrifugal forces. Also, the core-shell concept for composite blades is an inefficient design (core plies not highly stressed) and appears to be sensitive to interply delaminations. The results are presented in graphical and tabular forms to illustrate the types and amount of data required for such an analysis, and to provide quantitative data of the various responses which can be helpful in designing such composite blades.

DYNAMIC BUCKLING AND POSTBUCKLING OF A COMPOSITE SHELL

2010 ◽  
Vol 10 (04) ◽  
pp. 791-805 ◽  
Author(s):  
CHRISTOS C. CHAMIS
Keyword(s):  
Solution Method ◽  
Composite Shell ◽  
Dynamic Buckling ◽  
Dynamic Loads ◽  
Composite Cylindrical Shell ◽  
Buckling Loads ◽  
Loading Rates ◽  
Computer Codes ◽  
Updated Lagrangian ◽  
Composite Mechanics

A computationally effective method for evaluating the dynamic buckling and postbuckling of thin composite shells is described. It is a judicious combination of available computer codes for finite element, composite mechanics and incremental structural analysis. The solution method is an incrementally updated Lagrangian. It is illustrated by applying it to a thin composite cylindrical shell subjected to dynamic loads. Buckling loads are evaluated to demonstrate the effectiveness of the method. A universal plot is obtained for the specific shell that can be used to approximate buckling loads for different dynamic loading rates. Results from this plot show that the faster the rate, the higher the buckling load and the shorter the time. They also show that the updated solution can be carried out in the postbuckling regime until the shell collapses completely. Comparisons with published literature indicate reasonable agreement.

Effect of Grain Growth Inhibitors VC/Cr3C2 on WC-ZrO2-Ni Composite Mechanics

2014 ◽  
Vol 604 ◽  
pp. 106-109 ◽  
Author(s):  
Der Liang Yung ◽  
Min Jie Dong ◽  
Irina Hussainova
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Growth ◽  
Growth Inhibitors ◽  
Loading Conditions ◽  
Transformation Toughening ◽  
Composite Mechanics

The effect of VC and Cr3C2 grain growth inhibitors on mechanical properties of the WC-Ni-ZrO2 composites are studied in the present work. The microstructural features responsible for a change in mechanical properties are analysed. Addition of both VC and Cr3C2 results in increase in hardness of the WC-based system, but consequently in decrease in fracture toughness. The transformation toughening effect of ZrO2 is not effective for the loading conditions applied in this study.

scholarly journals Coupled Multi-Disciplinary Simulation of Composite Engine Structures in Propulsion Environment

1992 ◽  
Author(s):  
Christos C. Chamis ◽  
Surendra N. Singhal
Keyword(s):  
Acoustic Analysis ◽  
Acoustic Noise ◽  
Computational Simulation ◽  
Aircraft Engine ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Element Analysis ◽  
Composite Mechanics

A computational simulation procedure is described for the coupled response of multi-layered multi-material composite engine structural components which are subjected to simultaneous multi-disciplinary thermal, structural, vibration, and acoustic loadings including the effect of hostile environments. The simulation is based on a 3D finite element analysis technique in conjunction with structural mechanics codes and with the acoustic analysis methods. The composite material behavior is assessed at the various composite scales, i.e., the laminate/ply/fiber and matrix constituents, via a nonlinear material characterization model. Sample cases exhibiting nonlinear geometrical, material, loading, and environmental behavior of aircraft engine fan blades, are presented. Results for deformed shape, vibration frequencies, mode shapes, and acoustic noise emitted from the fan blade, are discussed for their coupled effect in hot and humid environment. Results such as acoustic noise for coupled composite-mechanics/heat transfer/structural/vibration/acoustic analyses demonstrate the effectiveness of coupled multi-disciplinary computational simulation and the various advantages of composite materials compared to metals.

Sign in / Sign up

Export Citation Format

Share Document