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Topic: Dynamic mechanical analysis

Related Topics

Differential scanning calorimetry

Glass transition temperature

Thermosetting plastic

DMA

Polymer

FTIR

Plastic

Polymer substrate

Rubber

US Air Force

Melting point

Acrylonitrile butadiene styrene

Polypropylene

Synthetic polymer

Yokota Air Base

	Dynamic Mechanical Analysis as a Complementary Damage Characterization Technique for Composite Materials
		The effects of fatigue damage on the time, temperature, and frequency response of fiber-reinforced laminates were measured by performing dynamic mechanical analysis (DMA) tests on composite coupons which had been subjected to different amounts of fatigue loading and which exhibit varying degrees of fatigue-induced damage.
		The DMA test results were interpreted in light of other conventional measures of fatigue response, such as change in dynamic stiffness and residual strength, and compared to nondestructive evaluation data of the different damage modes present in the laminates.
		The applicability of mechanical spectroscopy as a potential complementary technique to characterize damage and fatigue response of fiber-reinforced laminates was investigated.
	www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP14569S.htm (419 words)

	Dynamic mechanical analysis - Wikipedia, the free encyclopedia
		Dynamic mechanical analysis (DMA) or dynamic mechanical thermal analysis (DMTA) is a technique used to study and characterize materials.
		It is most useful for observing the viscoelastic nature of polymers.
		By scanning the temperature during a DMA experiment the change of state can be observed.
	en.wikipedia.org /wiki/Dynamic_mechanical_analysis (239 words)

	anasys: introduction to dynamic mechanical analysis (3)
		Dynamic Mechanical Analysis (DMA) can be used to study the effects of blending two polymers together or adding plasticisers to polymeric systems.
		The diagram above shows idealised DMA curves of two homopolymers A and B. When they are blended together a completely miscible system results and the glass transition of the resulting system is situated between the Tg's of the parent materials in proportion to the amount of each phase present in the blend.
		Moisture blocks the rotation of the acetate groups which occurs around 120°C and leads to an increase in dynamic modulus between this temperature and the Tg (which is reduced by the presence of water).
	www.anasys.co.uk /library/dma3.htm (463 words)

	Impact Analytical - Dynamic Mechanical Analysis (Site not responding. Last check: 2007-10-17)
		DMA is commonly used to determine quantitative flexural storage and loss moduli, shear storage and loss moduli, tan delta, and the dynamic and complex viscosity of materials.
		DMA is also particularly useful for qualitatively characterizing the glass transition temperature and other sub-Tg transitions of polymer and composite materials.
		Since the mechanical loss characteristics of a material are directly related to molecular level motions, the DMA damping signal is particularly sensitive to a material's glass transition process.
	www.impactanalytical.com /dma.html (347 words)

	Simultaneous Dynamic Mechanical Analysis and Dielectric Analysis facility
		Dynamic mechanical analyzers measure changes in mechanical behavior, such as modulus and damping, as a function of temperature, time, frequency, stress or strain or combinations of these parameters.
		Simultaneous results are obtained using traditional DMA parallel plates (or cup and plates) as electrodes for the DEA.
		Complete dynamic and dielectric analysis of samples can be done through the use of the right mode of operation and in conjunction with the DEA.
	academic.sun.ac.za /polymer/dma.htm (572 words)

	Dynamic mechanical analysis - Open Encyclopedia (Site not responding. Last check: 2007-10-17)
		Dynamic mechanical analysis (DMA) or dynamic mechanical thermal analysis (DMTA)
		DMA is a technique used to study and characterise materials.
		By scanning the temperature during a DMA experiment the change of state can be observed and the glass transition temperature (Tg) can be determined.
	open-encyclopedia.com /Dynamic_mechanical_analysis (154 words)

	anasys: introduction to dynamic mechanical analysis (4) (Site not responding. Last check: 2007-10-17)
		DMA is also used to study the behaviour of thermosetting polymers that are undergoing cross-linking due to chemical reaction.
		The curves below show the overlaid DMA and DSC response of a carbon fibre-epoxy composite undergoing isothermal curing at 120°C. The large peak in heat flow at the start is due to the chemical reaction.
		It is not generally possible to measure the absolute mechanical modulus of the polymer using this technique.
	www.anasys.co.uk /library/dma4.htm (261 words)

	Materials Research Lab - Dynamic Mechanical Analysis (DMA) (Site not responding. Last check: 2007-10-17)
		DMA is particularly useful for evaluating viscoelastic polymers that have mechanical properties, which exhibit time, frequency, and/or temperature effect.
		DMA is the most sensitive of all thermal analytical techniques.
		The distance between the arms is adjustable by means of a precision mechanical slide to accommodate a wide range a sample length from less than 1 mm up to 65 mm.
	scienceline.mrl.ucsb.edu /mrl/centralfacilities/polymer/DMA.html (526 words)

	9844 - Dynamic Mechanical Analysis for Plastics Engineering (SPE)
		Dynamic mechanical analysis (DMA) is one of the most powerful tools to predict the behavior of plastic materials.
		While DMA has served the research field well, it is also an invaluable tool for engineers who need to assess the temperature and time dependent behavior of materials under load.
		DMA measures the viscoelastic properties of materials and provides, in graphic form, a picture of the relationship between temperature and modulus.
	www.normas.com /SPE/Pages/9844.html (178 words)

	Glass-Transitions in Polymeric Roofing Membranes - Determination by Dynamic Mechanical Analysis
		Mechanical properties of polymeric materials have two facets; one is related to the macroscopic behaviour and the other, to the molecular behaviour which includes chemical composition and physical structure.
		Dynamic mechanical analysis (DMA or DMTA) can be used routinely to determine various properties of a roofing membrane, e.g., the glass transition temperature.
		DMA instruments usually employ forced vibration conditions to deform a sample and study its viscoelastic response.
	irc.nrc-cnrc.gc.ca /fulltext/nrcc35499 (2968 words)

	Encyclopedia: Dynamic Mechanical Analysis (Site not responding. Last check: 2007-10-17)
		Differential scanning calorimetry (DSC) is a thermoanalytical technique in which the difference in the amount of heat required to increase the temperature of a sample and reference are measured as a function of temperature.
		Dynamic Mechanical Analysis (DMA) is a thermal analysis technique used to measure changes in the viscoelastic response of a material as a function of temperature, time, or deformation frequency.
		DMA loss profiles obtained on block copolymers generally show two distinct Tgs, which are related to the Tgs of the respective homopolymer components in the block copolymer, provided the inherent component material transitions are sufficiently well separated.
	www.nationmaster.com /encyclopedia/Dynamic-Mechanical-Analysis (646 words)

	Characterization of Ethylene-Propylene-Diene Monomer (EPDM) Roofing Membranes using Thermogravimetry and Dynamic ...
		Mechanical tests only describe how a material behaves with respect to a certain test and do not explain why the material failed unless the failure is related solely to structural properties.
		The objective of this study is to demonstrate the utility of TGA and DMA in establishing the durability of roofing membranes.
		The dynamic mechanical analysis curves for sample S1, showing the loss modulus (E'') as a function of temperature can be found in Figure 5 for heat-aging at 100 °C and 130 °C, respectively.
	irc.nrc-cnrc.gc.ca /fulltext/nrcc36895 (3129 words)

	Concerns about dynamic mechanical analysis
		Dynamic mechanical analysis (DMA) or dynamic mechanical thermal analysis (DMTA) DMA is a technique used to study and characterise materials.
		Dynamic Mechanical Analysis (DMA) or Dynamic Mechanical Thermal Analysis (DMTA) DMA is a technique used to study and...
		DMA measures the mechanical properties of materials as a...
	businessmanager-comeback.com /articles/27/dynamic-mechanical-analysis.html (537 words)

	Application of dynamic mechanical analysis (DMA) to determine the mechanical properties of pellets. (Site not responding. Last check: 2007-10-17)
		Application of dynamic mechanical analysis (DMA) to determine the mechanical properties of pellets.
		Application of dynamic mechanical analysis (DMA) to determine the mechanical properties of pellets.Pellets of a wide range of mechanical properties were produced by the process of extrusion and spheronisation using various formulation factors.
		A range of mechanical properties from a simple fracture load to detailed load/displacement curves obtained when pellets were subjected to diametral compression test and a bed of pellets was compacted, were used to provide measure of tensile strength, deformability, linear strain, elastic modulus, yield and shear strength.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/10407866.html (164 words)

	www.eastman.com - Markets - Adhesives - Tackifier Center - Select - Comp_DMA (Site not responding. Last check: 2007-10-17)
		Dynamic mechanical analysis (DMA) is a rheological method used to measure the viscoelastic performances of a polymeric system.
		DMA can be done with either a variable temperature or frequency of oscillation method.
		The DMA analysis provides rheological curves G" and G' versus temperature that provide useful information on tackiness versus temperature, and on compatibility between the polymer and tackifier resin.
	www.eastman.com /Markets/Adhesives_and_Sealants/TackifierCenter/Select/Comp_DMA.htm (420 words)

	anasys: introduction to dynamic mechanical analysis (2) (Site not responding. Last check: 2007-10-17)
		Dynamic Mechanical Analysis (DMA) is particularly useful for measuring transitions in polymers that cannot be detected by other techniques.
		The drop in storage modulus (E') and peak in damping factor (tan delta) between -60 and -30°C is due to the glass transition (Tg) of the amorphous polymer in this semi-crystalline material.
		As the mechanical frequency is increased the position of the glass-rubber transtion moves to a higher temperature since the polymer chains need more energy (i.e.
	www.anasys.co.uk /library/dma2.htm (374 words)

	Investigation of Moisture Effects on Interfacial Properties of an Epoxy Matrix Composite by Dynamic Mechanical Analysis
		The interfacial properties of polymer matrix composites are critical to the retention of the mechanical properties of the composites in a wet environment.
		The objective of this study is to investigate the effect of moisture on the interfacial properties of glass bead- epoxy composites by measuring mechanical properties obtained through dynamic mechanical testing.
		In order to characterize the relationship between dynamic mechanical properties and interfacial structure, composites with different interfacial structures were tested and the results were compared.
	otrc.tamu.edu /Pages/A6175.html (365 words)

	The Glass Transition Temperature of Glassy Polymers Using Dynamic Mechanical Analysis
		Dynamic Mechanical Analysis (DMA) is presented for four glassy polymers.
		The effect of frequency on the dynamic mechanical parameters was also examined from 0.01 Hz to 10 Hz.
		The dynamic elastic storage modulus (), the dynamic elastic loss modulus () and the tan () were affected by both the heating rate and the frequency.
	www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP15379S.htm (193 words)

	Evaluating Surface Treatment Effects on Interfacial Bond Strength Using Dynamic Mechanical Analysis
		Three series of torsional dynamic mechanical analysis (DMA) tests were conducted on unidirectional carbon/epoxy composites to determine differences in interfacial bond strength.
		Dynamic mechanical analysis was able to clearly differentiate between the fiber/matrix bond strength of pitch-based and PAN-based fibers.
		The dynamic mechanical loss modulus increased with increasing fiber volume fraction or total surface area.
	www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP24743S.htm (261 words)

	Anderson Materials Evaluation, Inc.: Dynamic Mechanical Analysis (Site not responding. Last check: 2007-10-17)
		The DMA module measures changes in the viscoelastic properties of the materials resulting from changes in temperature, atmosphere, and time.
		The DMA result of a FRP sample is shown in the figure below with resonant frequency as a function of temperature.
		The storage modulus (the ratio of stress in phase with strain to the magnitude of strain) is proportional to the resonant frequency of the polymer material.
	www.andersonmaterials.com /dma.htm (375 words)

	The effect of benzyl alcohol on the glass-transition temperature and dyeing behaviour of wet Courtelle S by means of ... (Site not responding. Last check: 2007-10-17)
		The effect of benzyl alcohol on the glass-transition temperature and dyeing behaviour of wet Courtelle S by means of dynamic mechanical analysis
		Aitken, D.; Burkinshaw, S. M.; Price, D. The effect of benzyl alcohol on the glass-transition temperature and dyeing behaviour of wet Courtelle S by means of dynamic mechanical analysis.
		Dynamic mechanical analysis was used to demonstrate the plasticising action of benzyl alcohol on wet Courtelle S tow.
	www.sump4.com /publications/paper004.html (164 words)

	Dynamic Mechanical Analysis of Chemically Modified Banana Fibre Polyester Composites (Site not responding. Last check: 2007-10-17)
		Dynamic Mechanical properties of composites made out of chemically modified banana fibre were investigated and compared with those of virgin fibre composites.
		The dynamic modulus value and damping parameter, used to quantity interfacial interaction in composites were investigated with special reference to the effect of temperature and frequency.
		Increased dynamic modulus values and low damping values point to the improved interactions between the fibre and the matrix.
	www.materials.qmw.ac.uk /ecocomp/EcoComp_2001/Abstracts/pothan.htm (209 words)

	Dynamic Mechanical Analysis: A Practical Introduction to Techniques and Applications (Site not responding. Last check: 2007-10-17)
		Dynamic mechanical analysis has left the exclusive domain of the rheologist, becoming a prevalent tool in the analytical laboratory.
		However, DMA data is most useful when supported by other thermal data, and the use of DMA data to complement thermal analysis is often neglected.
		DMA can be a very cost-effective tool when done properly, as it tells you quite a bit about material behavior quickly...”
	www.polysurfacesbookstore.com /pages/3293.html (249 words)

	Dynamic Mechanical Analysis (DMA) ASTM D 4065 D 5279
		Dynamic Mechanical Analysis determines elastic modulus (or storage modulus, G'), viscous modulus (or loss modulus, G'') and damping coefficient (Tan
		DMA identifies transition regions in plastics, such as the glass transition, and may be used for quality control or product development.
		DMA can recognize small transition regions that are beyond the resolution of DSC (Differential Scanning Calorimetry).
	www.ptli.com /testlopedia/tests/DMA-D4440.asp (256 words)

	DYNAMIC MECHANICAL ANALYSIS ON HUMAN LENSES (Site not responding. Last check: 2007-10-17)
		Introduction: For the development of lens substitute materials the knowledge of the dynamic mechanical properties of the human lens material and of the possible substitutes is important.
		Purpose: Measurement of the dynamic mechanical properties of human lenses in dependence on age.
		Methods: In Dynamic Mechanical Analysis (DMA), samples are subjected to a periodic shear deformation at different frequencies.
	www.dog.org /2000/e-abstract_2000/646.html (222 words)

	Plastics - Dynamic Mechanical Analysis for Plastics Engineering (Site not responding. Last check: 2007-10-17)
		Dynamic Mechanical Analysis for Plastics Engineering describes practical uses for DMA information.
		All of the information for 120 families of thermoplastics is based on independent test data conducted exclusively for this product and is not available through any other source.
		This PDL addition shows how to use the DMA data to predict, at various temperatures, each materials estimated service life and potential for failure.
	www.williamandrew.com /books.asp?id=88420764 (164 words)

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