3 edition of Effects of delaminations on the damped dynamic characteristics of composite laminates found in the catalog.
Effects of delaminations on the damped dynamic characteristics of composite laminates
by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va
Written in English
|Statement||D.A. Saravanos and D.A. Hopkins.|
|Series||NASA technical memorandum -- 106862.|
|Contributions||Hopkins, Dale A., United States. National Aeronautics and Space Administration.|
|The Physical Object|
Delaminations in composite laminates may develop from small cracks due to fabrication and impact loading, or from places of high stress concentration. The locations of the delaminations are not determinate. In this research, an analytical solution for the free vibration of a composite beam with two overlapping delaminations is presented. The delaminated beam is analyzed as seven interconnected. Delaminations which covered 1/3 of the specimen length had no more than a 20% effect on any of the first four frequencies. Gibson, R.F. " Dynamic Mechanical Behavior of Fiber-Reinforced Composites: Measurement and Analysis " Journal of Composite Materials, (October ).
This paper considers the damped small-amplitude free-vibration of composite laminated strips subject to large in-plane forces and rotations. A theoretical framework is formulated for the prediction of the nonlinear damping of composite laminates subject to large Green–Lagrange axial strains and assuming a Kelvin viscoelastic solid.  introduced a dynamic finite element method for free vibration analysis of generally laminated composite beams on the basis of first-order shear deformation theory. The influences of Poisson effect, couplings among extensional, bending and torsional deformations, shear deformation and rotary inertia are incorporated in the formulation.
Effect of Delamination on Static and Dynamic Behavior of Laminated Composite Plate  Oh J., Cho M. and Kim J. S., “ Dynamic Analysis of Composite Plate with Multiple Delaminations Based on Higher-Order Zigzag Gillespie J. W. and McCarthy M. A., “ Analysis of Thick Composite Laminates Using a Higher-Order Shear and Normal. Several researchers studied dynamic behavior of hybrid composite laminates investigating hybridization effects. Vannan and Vizhian  investigated the effect of temperature on damping characteristics of aluminium alloy/basalt short fiber metal matrix composites containing various amounts of .
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EFFECTS OF DELAMINATIONS ON THE DAMPED DYNAMIC CHARACTERISTICS OF COMPOSITE LAMINATES: ANALYSIS AND EXPERIMENTS. Analytical and experimental work is presented on the damped free vibration of delaminated laminates and beams. A laminate theory is developed in which the unknown kinematic perturbations induced by a delamination crack are Cited by: Effects of Delaminations on the Damped Dynamic Characteristics of Composite Laminates: Mechanics and Experiments Analytical and experimental work is presented on the damped free-vibration of delaminated laminates and beams.
A laminate theory is developed where the unknown kinematic perturbations induced by a delamination crack are treated as additional degrees of freedom. Effects of Delaminations on the Damped Dynamic Characteristics of Composite Laminates: Mechanics and Experiments Analytical and experimental work is presented on the damped free-vibration of delaminated laminates and beams.
A laminate theory is developed where the unknown kinematic perturbations induced by a delamination crack are treated Author: D. Hopkins and D.
Saravanos. Effects of Delaminations on the Damped Dynamic Characteristics of Composite Laminates: Mechanics and Experiments (English Edition) eBook: NASA, National Aeronautics and Space Administration: : Tienda KindleFormat: Kindle.
Saravanos D A and Hopkins D A Effects of delaminations on the damped dynamic characteristics of composite laminates: analysis and experiments J. Sound Vib. Crossref Google Scholar Cited by: A dynamic analysis method has been developed to investigate and characterize the effect due to the presence of discrete single and multiple delaminations of composite laminated structures.
Request PDF | Dynamic characteristics of composite reinforced laminates attached with frequency-dependant damping layers | An efficient natural frequency and dynamic responses analysis for damaged. D.A. SARAVANOS, D.A. HOPKINSEffects of delaminations on the damped dynamic characteristics of composite laminates: analysis and experiments Journal of Sound and vibrations, (), pp.
Google Scholar. Effects of Delaminations on the Damped Characteristics of Composite Laminates: Analytical and Experimentspp. – Crossref. Search ADS Chrysochoidis, N. A., and. Saravanos, D. A.,“ Assesing the Effects of Delamination on the Damped Dynamic Response of the Composite Beams With Piezoelectric Actuators and Sensors.
A method for predicting the damped dynamic characteristics of thick composite laminates and plates is presented. Unified damping mechanics relate the damping of composite plates to constituent properties, fiber volume ratio, fiber orientation, laminate configuration, plate.
Download Citation | Effects of Delaminations on Vibration Characteristic for HT3/ Carbon Fiber Reinforced Laminated Plate | Delaminating of composite is one of keys for composite structures. the effect of the size of beneath delaminations has no significant on the critical buckling load and compressive failure load of E-glass/epoxy composite laminates with multiple large delaminations, a numerical and experimental study is carried out to determine the buckling load of rectangular composite.
V arious aspects of the delamination inﬂuence on the dynamic characteristics of composite beams and plates were analysed numerically and experimentally by Mujumdar and Suryanarayan , Han et. "Effects of Delaminations on the Damped Dynamic Characteristics of Composite Laminates: Analysis and Experiments," Sound Vibration, (5): 2.
Hong M and Chen H R. "Vibration frequency, mode and damping behavior of laminated composite plates with delamination," J. Ship Mechanics, 3(6) 3. Luo Hand Hanagud S. In order to investigate the effects of these multiple delaminations on the dynamic characteristics of composite beams, the general kinematics continuity conditions are derived from the assumption.
The effects of delaminations on the dynamic response of a structure are subtler, compared to the large reductions in compressive strength, and there are fewer models for describing these effects,.
The effects of delamination on the dynamic characteristics of composite plates have been addressed in Refs. Singh et al.  developed an FE model for predicting the drilling characteristics of UD-GFRP composite laminates.
Vengatesan et al.  conducted an experiment and analysis on different orientations of GFRP composite laminate specimens at specified cutting and material parameters using ANSYS . Study on Dynamic Characteristics of Delaminated Smart Composite Laminates Transactions of the Korean Society for Noise and Vibration Engineering, Vol.
15, No. 4 Vibration of composite beams with two overlapping delaminations. The polymer composite samples are made with natural/synthetic fiber as reinforcement and a synthetic resin as matrix material.
To find its natural frequency and damping of the composite materials, vibration test is carried out. Effect of delaminations on the damped dynamic characteristics of composite laminates: analysis and experiments.
One of the most common defects in composite laminates is delamination. The presence of delamination may cause changes to the vibration characteristics of the structure and can be the most damaging failure mode of composite materials.
The free vibrations of composite beams with multiple delaminations have extensively studied by Shu and Della [1, 2].
Mainly explained by the mismatch of the elastic material properties between two adjacent dissimilar laminate layers, the free-edge effect is characterized by the concentrated occurrence of three-dimensional and singular stress fields at the free edges in the interfaces between two layers of composite laminates.
Delaminations in structures may significantly reduce the stiffness and strength of the structures and may affect their vibration characteristics. As structural components, beams have been used for various purposes, in many of which beams are often subjected to axial loads and static end moments.
In the present study, an analytical solution is developed to study the coupled bending .A Damage Model for Prediction of Static and Fatigue-Driven Delamination in Composite Laminates,” 6th Workshop on Computational Approaches to Material Modelling and .