Dynamic modulus measurement using the Dynamic Mechanical Analyzer

2006 ◽  
Vol 119 (5) ◽  
pp. 3298-3298
Author(s):  
Kin Ng ◽  
Richard Deigan ◽  
Samedi Koch
Keyword(s):  
Dynamic Modulus ◽  
Dynamic Mechanical Analyzer ◽  
Dynamic Mechanical ◽  
Modulus Measurement

scholarly journals Multiscale Characterization of E-Glass/Epoxy Composite Exposed to Extreme Environmental Conditions

2021 ◽  
Vol 5 (3) ◽  
pp. 80
Author(s):  
George Youssef ◽  
Scott Newacheck ◽  
Nha Uyen Huynh ◽  
Carlos Gamez
Keyword(s):  
Power Distribution ◽  
Epoxy Composite ◽  
Fire Retardant ◽  
Sandwich Composite ◽  
Dynamic Mechanical Analyzer ◽  
Fire Event ◽  
Balsa Wood ◽  
X Ray ◽  
Dynamic Mechanical ◽  
Composite Skins

Fiber-reinforced polymer matrix composites continue to attract scientific and industrial interest since they offer superior strength-, stiffness-, and toughness-to-weight ratios. The research herein characterizes two sets of E-Glass/Epoxy composite skins: stressed and unstressed. The stressed samples were previously installed in an underground power distribution vault and were exposed to fire while the unstressed composite skins were newly fabricated and never-deployed samples. The mechanical, morphological, and elemental composition of the samples were methodically studied using a dynamic mechanical analyzer, a scanning electron microscope (SEM), and an x-ray diffractometer, respectively. Sandwich composite panels consisting of E-glass/Epoxy skin and balsa wood core were originally received, and the balsa wood was removed before any further investigations. Skin-only specimens with dimensions of ~12.5 mm wide, ~70 mm long, and ~6 mm thick were tested in a Dynamic Mechanical Analyzer in a dual-cantilever beam configuration at 5 Hz and 10 Hz from room temperature to 210 °C. Micrographic analysis using the SEM indicated a slight change in morphology due to the fire event but confirmed the effectiveness of the fire-retardant agents in quickly suppressing the fire. Accompanying Fourier transform infrared and energy dispersive X-ray spectroscopy studies corroborated the mechanical and morphological results. Finally, X-ray diffraction showed that the fire event consumed the surface level fire-retardant and the structural attributes of the E-Glass/Epoxy remained mainly intact. The results suggest the panels can continue field deployment, even after short fire incident.

scholarly journals Evaluation of dynamic modulus measurement for C/C‐SiC composites at different temperatures

2019 ◽  
Vol 16 (5) ◽  
pp. 1723-1733 ◽  
Author(s):  
Sandrine Hönig ◽  
Dietmar Koch ◽  
Steffen Weber ◽  
Simon Etzold ◽  
Thorsten Tonnesen ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Different Temperatures ◽  
Modulus Measurement ◽  
Sic Composites

Changes in the Dynamic Modulus during Thermal Degradation of Polyisoprene Vulcanizates

1980 ◽  
Vol 53 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Shoichiro Yano
Keyword(s):  
Thermal Degradation ◽  
Dynamic Modulus ◽  
Dynamic Method ◽  
Activation Energies ◽  
Time Axis ◽  
Frequency Dependent ◽  
Dynamic Mechanical ◽  
Mechanical Measurements

Abstract Thermal degradation of IR is investigated in air and in N2 by dynamic mechanical measurements. In this dynamic method, the change in the relative dynamic modulus is found to be frequency dependent, but the data at various frequencies can be superimposed upon each other by shifting along the time axis. Changes in relative modulus as a function of time in air and in N2 can be expressed by Equation (1), which contains two exponential terms. The activation energies for k1 and k2 are 84 and 57 kj/mol in air, and 61 and 57 kJ/mol in N2, respectively.

Thermal characterization of carbon nanoparticle infused GFRP using dynamic mechanical analyzer

2019 ◽  
Vol 6 (10) ◽  
pp. 105317 ◽  
Author(s):  
R Karthicksundar ◽  
Balaji Rajendran ◽  
P K Dinesh Kumar ◽  
S Devaganesh
Keyword(s):  
Thermal Characterization ◽  
Dynamic Mechanical Analyzer ◽  
Carbon Nanoparticle ◽  
Dynamic Mechanical

Thermal Shrinkage Behavior of Battery Separator

2018 ◽  
Author(s):  
Shutian Yan ◽  
Jie Deng ◽  
Chulheung Bae ◽  
Xinran Xiao
Keyword(s):  
Thermal Expansion ◽  
Elevated Temperatures ◽  
Coefficient Of Thermal Expansion ◽  
Porous Membrane ◽  
Thermal Shrinkage ◽  
Dynamic Mechanical Analyzer ◽  
Free Standing ◽  
Dynamic Mechanical ◽  
Battery Separator ◽  
Shrinkage Behavior

Battery separators are thin, porous membrane of 20∼30 microns thickness. Polymer separators display a significant amount of shrinkage at elevated temperatures. It is difficult to quantitatively characterize the large shrinkage behavior with a free standing separator sample. This paper examines the use of a dynamic mechanical analyzer under tensile mode in measuring the coefficient of thermal expansion (CTE) of three commonly used separators.

Microstructures and Damping Capacity of Mg-6Zn-0.5Zr Alloy

2012 ◽  
Vol 557-559 ◽  
pp. 1624-1628 ◽  
Author(s):  
Xian Lan Liu ◽  
Chu Ming Liu ◽  
Wen Yu Zhang ◽  
Jian Hua Luo ◽  
Su Min Zeng
Keyword(s):  
Strain Amplitude ◽  
Critical Strain ◽  
Damping Capacity ◽  
Damping Properties ◽  
Dynamic Mechanical Analyzer ◽  
Dynamic Mechanical ◽  
Experimental Strain ◽  
Damping Peak ◽  
Peak Value

The dynamic mechanical analyzer (DMA) was applied to investigate the damping properties of Mg-6Zn-0.6Zr alloys. The results show that the as-cast Mg-6Zn-0.6Zr alloy exhibits higher strain amplitude independent damping performance than that of as-homogenized. The strain amplitude dependent damping of the as-homogenized has the best damping performance with the strain amplitude from 3×10-5 to 6×10-4, and the as-extruded is the lowest. When the strain amplitude exceeded 6×10-4, the as-extruded has the best damping capacity all the time within the experimental strain amplitude, and all the alloys reach the high damping capacity. Two critical strain amplitude points were detected in the alloy as-extruded and as-homogenized. The damping peak value is 0.0192 with the strain amplitude of 1.5×10-3 presented in the alloy as-extruded.

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