Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Acquisition
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Leaky Lamb Waves (LLW) NDE Composites Stiffness Co↗
Engineering topics
Mal, A. K.
Publications and source records attributed to Mal, A. K..
Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Aquisition Method
The leaky Lamb waves (LLW) technique is approaching a maturity level that is making it attractive quantitative NDE tool for composites and bonded joints.
NDE Leaky Lamb Waves (LLW) composite materials Sti↗
NDE of Hidden Flaws in Aging Aircraft Structures Using Obliquely Backscattered Ultrasonic Signals (OBUS)
Corrosion is a relatively slow material degradation process to which metallic structures of aircraft are subjected during service and it can appear in many forms.
OBUS↗
Oblique Insonification Ultrasonic NDE of Composite Materials for Space Applications
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Composite Materials↗
(abstract) Oblique Insonification Ultrasonic NDE of Composite Materials for Space Applications
In recent years, a great deal of research has been exerted to developing NDE methods for the characterization of the material properties of composites as well as other space structural materials. The need for information about such parameters as the elastic properties, density, and thickness are critical to the safe design and operation of such structural materials. Ultrasonics using immersion methods has played an important role in these efforts due to its capability, cost effectiveness, and ease of use. The authors designed a series of ultrasonic oblique insonification experiments in order to develop a practical field applicable NDE method for space structures.
ultrasonic composites nondestructive evaluation ND↗
Measuring the Thickness and Elastic Properties of Electroactive Thin-film Polymers Using Platewave Dispersion Data
Electroactive thin-film polymers are candidate sensors and actuators materials [1,2]. They are also finding a significant potential for applications in muscle mechanisms and micro-electro-mechanical systems (MEMS).
micro-electro-mechanical systems MEMS↗
Nondestructive Determination of Heat/Fire Damage to Polymer - Matrix Composites Using Obliquely Insonified Ultrasonic Waves
Reported on is the development of a quantitative NDE method, using stiffness analysis, for the determination of the degradation of composite materials that are exposed to elevated temperatures, prior to the formation of delaminations or other defects. Methods of testing describe a specimen immersed in water and subjected to ultra- sound, with reflected pulses or tone-burst (leaky Lamb wave) analysis.
polymer matrix composites ultrasonic waves leaky L↗
Response of Multilayered Composite Laminates to Dynamic Surface
A theoretical investigation was performed of the response of.
composites laminates surface loads dynamic loads↗
Composite Material Property Nondestructive Characterization Using Obliquely Insonified Ultrasonic Waves
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ultrasonic waves fiber orientation composite lamin↗
Ultrasonic Evaluation of Thermal Degradation in Adhesive Bonds
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ultrasonic nondestructive evaluation technique hea↗
Elastic Property Characterization of Structrual Solids Using Contact Ultrasonics
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receivers waves↗
Composite Material Property Nondestructive Characterization Using Obliquely Insonified Ultrasonic Waves
The analysis of reflected ultrasonic waves induced by oblique insonification of composite materials is a powerful tool for providing informations about defects and material properties. A device was developed to manipulate a pair of transmitting and receiving transducers at vrious angles of wave incidence and propagation with the fiber orientation.
Non-Destructive Evaluation Composites Mechanical P↗
Nondestructive Characterization of Adhesive Bonds from Guided Wave Data
The critical role played by adhesive bonds in the fracture and failure of composites and other bonded materials is well known. A good knowledge of the mechanical properties of these adhesion joints is a prerequisite to reliable design and reliable prediction of the performance of these bonded structures.
moduli↗
Characterization of the Elastic Constants of Unidirectional Laminates by Oblique-Incidence Pulsed Data
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composites composite components ultrasonic testing↗
Characterization of the Elastic Constants of Unidirectional Laminates Using Oblique-Incidence Pulsed Data
From Intro: In this paper, wer apply the LLW (leaky Lamb Wave) technique to determine the stiffness constants of unnidirectional graphite/epoxy materials...In this paper, we describe a new technique which can be used to determine all five stiffness constants by analyzing the times-of-flight of the recorded reflected acoustic waves in a pulsed LLW experiment.
composites composite components ultrasonics ultras↗
Nondestructive Characterization of the Elastic Constants of Fiber Reinforced Composites
Composite structural components may be subjected to a variety of defects resulting in a sharp reduction in their load carrying capacity or even catastrophic failure...A nondestructive method based on ultrasonics has recently been developed for the quantitative evaluation of composite structural components during service...In this paper the method is applied to determine the stiffness constants of unidirectional graphite/epoxy materials.
composites↗
Wave attenuation in thick graphite/epoxy composites
The mechanics of wave attenuation in thick graphite/epoxy composites is examined in order to facilitate interpretation of the wave amplitudes recorded in ultrasonic experiments. The values of a small number of parameters are determined through comparison between calculated and measured waveforms for four specimens. The agreement between the measured and calculated waveforms are shown to be excellent in all four cases.
Mal, A. K.↗