Nonlinear thermal flutter analysis of variable angle tow composite curved panels in supersonic airflow

2021 ◽  
pp. 114610
Author(s):  
Xiaodong Chen ◽  
Guojun Nie
Keyword(s):  
Supersonic Airflow ◽  
Variable Angle ◽  
Flutter Analysis ◽  
Curved Panels

Flutter analysis of periodically supported curved panels

2003 ◽  
Vol 267 (2) ◽  
pp. 267-278 ◽  
Author(s):  
Chitaranjan Pany ◽  
S. Parthan
Keyword(s):  
Flutter Analysis ◽  
Curved Panels

Static/Dynamic Edge Movability Effect on Non-Linear Aerothermoelastic Behavior of Geometrically Imperfect Curved Skin Panel: Flutter and Post-Flutter Analysis

2012 ◽  
Vol 79 (4) ◽  
Author(s):  
Laith K. Abbas ◽  
Xiaoting Rui ◽  
P. Marzocca ◽  
M. Abdalla ◽  
R. De Breuker
Keyword(s):  
Stable Limit Cycle ◽  
Limit Cycle Oscillation ◽  
Stable Limit ◽  
Third Order ◽  
Curved Panel ◽  
Flutter Analysis ◽  
Non Linear ◽  
Cycle Oscillation ◽  
Modeling Behavior ◽  
Curved Panels

This paper addresses the problem of the aerothermoelastic modeling behavior and analyses of skin curved panels with static and dynamic edge movability effect in high supersonic flow. Flutter and post-flutter behavior will be analyzed toward determining under which conditions such panels will exhibit a benign instability, that is a stable limit cycle oscillation, or a catastrophic instability, that is an unstable LCO. The aerothermoelastic governing equations are developed from the geometrically non-linear theory of infinitely long two dimensional curved panels. Von Kármán non-linear strain-displacement relation in conjunction with the Kirchhoff plate-hypothesis is adopted. A geometrically imperfect curved panel forced by a supersonic/hypersonic unsteady flow is numerically investigated using Galerkin approach. These equations are based on the third-order piston theory aerodynamic for modeling the flow-induced forces. Furthermore, the effects of thermal degradation and Kelvin’s model of structural damping independent of time and temperature are also considered in this model. Computational analysis and discussion of the finding along with pertinent conclusions are presented.

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

Flutter Analysis of a Tapered Viscoelastic Wing Subjected to a Follower Thrust Force

2019 ◽  
Vol 12 (1) ◽  
pp. 46
Author(s):  
Youssef S. Matter ◽  
Tariq Taha Darabseh ◽  
Abdel-Hamid I. Mourad
Keyword(s):  
Thrust Force ◽  
Flutter Analysis
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