Measurement of damping of composite materials for turbomachinery applications

Measurement of damping of composite materials for turbomachinery applications Download PDF EPUB FB2

MEASUREMENT OF DAMPING OF COMPOSITE MATERIALS FOR TURBOMACHINERY APPLICATIONS (MSFC Center Director's Discretionary Fund Final Report, Project No.

) I. INTRODUCTION It has been a widely held assumption that fiber-reinforced composite materials possess more inherent material damping than metals or monolithic compositesThe objective of this study is to quantify the material damping of fiber-reinforced composite materials that can be used in rocket engine turbomachinery.

Get this from a library. Measurement of damping of composite materials for turbomachinery applications: (MSFC Center director's discretionary fund final report, project no. [D L Harris; United States.

National Aeronautics and Space Administration.]. The scientific community has felt that ceramic matrix composite (CMC) materials possess more material damping than the superalloys used in the production of rocket engine turbomachinery turbine-end components.

The purpose of this NASA/MFSC study is to quantify the damping in CMC's as compared to a typical super-alloy, Inconel Cited by: 2. TECHNICAL MEMORANDUM MEASUREMENT OF DAMPING OF COMPOSITE MATERIALS FOR TURBOMACHINERY APPLICATIONS (MSFC Center Director’s Discretionary Fund Final Report, Project No.

) I. INTRODUCTION It has been a widely held assumption that fiber-reinforced composite materials possess more inherent material damping than metals or monolithic composites. The objective of this study is to quantify the material damping of fiber-reinforced composite materials.

The scientific community has felt that ceramic matrix composite (CMC) materials possess more material damping than the superalloys used in the production of rocket engine turbomachinery turbine-end components. The purpose of this NASA/MFSC study is to quantify the damping in CMC's as compared to a typical super-alloy, Inconel Author: D.

Harris. combined finite element and frequency response was developed to measure the damping properties of composite material. EXPERIMENTATION In this work carbon fiber/epoxy (CFRP) and glass fiber/epoxy (GFRP) were tested for their damping properties.

The specimens of dimensions x 30 x 2 mm were fabricated by the standard process [21]. The. The application of porous materials is a common measure for noise mitigation and in room acoustics. The prediction of the acoustic behavior applies material models, among which most are based on the Biot-parameters.

Thereby, it is expected that, if more Biot-parameters are used, a. Experimental measurements are essential in the study of damping of composite materials either for validation purposes or for material characterisation.

However, proper techniques are needed to tackle the low weight and high stiffness. Material properties, stiffness and damping (tanδ, where δ is the phase between stress and strain) as a function of temperature of a particulate VO 2 –tin composite with 1% by volume of.

Vibration Damping Properties of Steel/Rubber/Composite Hybrid Structures E. Sarlin *,1, Y. Liu 2, M. Vippola 1, M. Zogg 2, P. Ermanni 2, J. Vuorinen 1 and T.

Lepistö 1 1 Department of Materials Science, Tampere University of Technology, P. Box All damping measurements are made in the linear range, that is, the damping materials behave in accordance with linear viscoelastic theory. If the applied force excites the beam beyond the linear region, the data analysis will not be applicable.

For linear beam behavior, the peak displacement from rest for a composite beam should be less than the thickness of the base beam (See Appendix.

An exploration of the processing of composite materials, this book covers fiber reinforcements, production of various fibers and properties, and the processing of polymer matrix, metal matrix, and. Viscoelastic materials are of use in the damping of vibration and in the absorption of sound waves in some applications it is desirable to use material which are stiff enough to carry out a structural role and which also exhibit significant mechanical damping.

Most stiff materials are low in damping and most high damping materials are compliant. Measurement of Air Film Damping Effectiveness R. Mathison, R. Mathison. gas turbines, turbomachinery, damping, vibration control, vibrations, fatigue. Recent Advances in Air Film Damping for Gas Turbine Engine Applications,” Proceedings of the 8th High Cycle Fatigue Conference.

In addition to the flowfield measurements for expanded cooling hole geometries being unique to the literature, the testing facility used for these measurements was also unique in that both the external mainstream Mach number (Ma∞ = ) and internal coolant supply Mach number (Ma c = ) were nearly matched.

Results show that by expanding the exit of the cooling holes, both the penetration of. damping enhancement to be implemented and structurally integrated into aerodynamically loaded turbomachinery blades for application in future open rotor aircraft engines.

Turbomachinery blades are manufactured to date from metallic materials such as high-strength steel or titanium. Improvement of the weight to stiffness ratio, weight to. The measured damping performance will be expressed in terms of composite loss factor, η c, within the frequency range of approximately to Hz, and over the useful temperature range for the given application.

The term composite refers to the steel and damping material combination. to a minimum. The book should continue to be of use to engineers in industry and technological establishments, especially as brief reviews are included on many important aspects of turbomachinery giving pointers to more advanced sources of information.

For those looking towards the wider reaches of the subject area some. Damping in Structural Dynamics. US Air Force The influence of fiber length and fiber orientation on damping and stiffness of polymer composite-materials. Damping in turbomachinery blades.

The measured damping performance will be expressed in terms of composite loss factor, n(eta)c(sub), within the frequency range of approximately to Hz, and over the useful temperature range for the given application.

The term composite refers to the steel and damping material combination. X. Ottavy, I. Trebinjac, A. Vouillarmet: Treatment of L2F anemometer measurement volume distortions created by curved windows for turbomachinery applications, Meas.

Sci. Technol. 9, – () CrossRef Google Scholar.RESEARCH LABORATORY Load Capacity Estimation of Foil Air Journal Bearings for Oil-Free Turbomachinery Applications Christopher DellaCorte Glenn Research Center, Cleveland, Ohio PS is a plasma sprayed composite solid lubricant that has silver and fluoride eutectic lubricants in a.Vibration and Sound Damping in Polymers V G Geethamma, R Asaletha, Nandakumar Kalarikkal and Sabu Thomas Excessive vibrations or loud sounds cause deafness or reduced efficiency of people, wastage of energy and fatigue failure of machines/structures.

Hence, unwanted vibrations need to be dampened. This article describes the transmis.