Delamination Damage in Central Impacts at Subperforation Speeds on Laminated Kevlar/Epoxy Plates

2008 ◽  
pp. 387-387-19 ◽  
Author(s):  
LE Malvern ◽  
CT Sun ◽  
D Liu
Keyword(s):  
Delamination Damage

scholarly journals Parameter studies and evaluation principles of delamination damage in laminated composites

2021 ◽  
Author(s):  
Kangkang WANG ◽  
Libin ZHAO ◽  
Haiming HONG ◽  
Jianyu ZHANG ◽  
Yu GONG
Keyword(s):  
Laminated Composites ◽  
Delamination Damage

Quantitative nondestructive evaluation of delamination damage in CFRP pressure vessels for space use

2006 ◽  
Author(s):  
Takahide Sakagami ◽  
Shiro Kubo ◽  
Yukio Hyodo ◽  
Toshio Ogasawara ◽  
Takashi Nishimura ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Space Use ◽  
Pressure Vessels ◽  
Delamination Damage

Assessment of delamination location in composite laminates based on a chaotic oscillator method

2021 ◽  
Vol 263 (2) ◽  
pp. 4709-4716
Author(s):  
Xuan Li ◽  
Dunant Halim ◽  
Xiaoling Liu
Keyword(s):  
Material Properties ◽  
Composite Laminates ◽  
Damage Index ◽  
Vibration Signal ◽  
Harmonic Excitation ◽  
Vibration Measurement ◽  
Chaotic Oscillator ◽  
Signal Characteristics ◽  
High Level ◽  
Delamination Damage

The work aims to study the assessment of delamination location in composite laminates using vibration measurement with a chaotic oscillator method. Delamination is a type of damage that commonly occurs in composite laminates, which can cause a severe degradation of their material properties. The traditional vibration-based methods can encounter difficulties in detecting and locating these delamination-type damages especially when the size of delamination is relatively small and there is a significant level of noise in its vibration measurement. With this particular consideration, a vibration-based method using a non-linear chaotic oscillator was used in this study due to its sensitivity to the change in vibration signal characteristics. A numerical model of composite laminates with delamination damage under harmonic excitation was developed and the vibration signal obtained from composite laminates was processed using the chaotic oscillator method. A feature named Lyapunov Exponent (LE) was used as a delamination damage index to describe the characteristics of the chaotic oscillator for cases with delamination at varying structural locations. The effects of delamination locations on the developed damage index were analyzed in this work. The results showed that there was a strong correlation between the delamination location and the LE feature, even for the case with a relatively high level of measurement noise. The results demonstrated the effectiveness of the method to identify delamination in composite laminates, which has also the potential to be used to detect other types of damages.

Experimental Investigation of Widespread Delamination Damage to Composite Materials Caused by Radiant Heating

2013 ◽  
Author(s):  
Robert T. Bocchieri ◽  
Douglas S. Dierdorf ◽  
Kristofor S. Cozart ◽  
Steven P. Wells ◽  
Steven W. Kirkpatrick ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Composite Materials ◽  
Radiant Heating ◽  
Delamination Damage

FEM based delamination damage analysis of bonded FRP composite pipe joints

2018 ◽  
Vol 7 (1) ◽  
pp. 45-51 ◽  
Author(s):  
U. Kumar ◽  
P. Kumar ◽  
M. T. Noor ◽  
R. R. Das
Keyword(s):  
Damage Analysis ◽  
Frp Composite ◽  
Composite Pipe ◽  
Pipe Joints ◽  
Delamination Damage

Impact and Blast Pulse: Improving Energy Absorption of Fibre-Reinforced Composites Through Optimized Tailoring

2006 ◽  
Author(s):  
Ugo Icardi ◽  
Laura Ferrero
Keyword(s):  
Energy Absorption ◽  
Transverse Shear ◽  
Shear Stresses ◽  
Current Production ◽  
Transverse Shear Stresses ◽  
Production Technologies ◽  
Definition Of ◽  
Incoming Energy ◽  
Blast Pulse ◽  
Delamination Damage

This paper tries to conjugate an improvement of stiffness and delamination damage resistance. A number of published results allow us to guess the existence of fibre orientations that are a good compromise for an optimal absorption of the incoming energy and for maintaining of a high stiffness. Optimal absorption is herein intended as a way not involving weak properties, such as interlaminar strength. We seek for an optimal orientation of reinforcement fibres through definition of stationary conditions for bending and shear energy contributions under in-plane variation of plate stiffness coefficients. Our goal is to tune the energy absorption as desired. Two kinds of optimized layers are studied, that are compatible with current production technologies: type 1 reduces bending without substantially increasing the transverse shear stresses, type 2 reduces transverse shear stresses without substantially increasing deflections. Incorporation into the laminates of couples of these layers with opposite features and the same mean properties of those they substitute allows an energy transfer from an unwanted to a wanted mode, as shown by the numerical applications. In this way, the deflections and the stresses inducing delamination damage of laminates subjected to impact and blast pulse loads were reduced, while damping should not substantially change since the variation of the orientation of fibres lies in a range where mild variations of it are induced.

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