The origin of a new transition in dynamic mechanical spectra of multilayer polymeric composite

Polymer ◽  
2012 ◽  
Vol 53 (12) ◽  
pp. 2519-2523 ◽  
Author(s):  
Jiabin Shen ◽  
Jiang Li ◽  
Shaoyun Guo
Keyword(s):  
Polymeric Composite ◽  
Dynamic Mechanical ◽  
Mechanical Spectra

Dynamic Mechanical Property of Quasi Constrained Layer Structural Piezoelectric Ceramic/Carbon Black/Epoxy Resin Composites

2011 ◽  
Vol 284-286 ◽  
pp. 429-433
Author(s):  
Wen Chao Huang ◽  
Tao Wei ◽  
Min Xian Shi
Keyword(s):  
Carbon Black ◽  
Epoxy Resin ◽  
Piezoelectric Ceramic ◽  
Volume Fraction ◽  
Layer Structure ◽  
Polymeric Composite ◽  
Mechanical Analysis ◽  
Constrained Layer Damping ◽  
Dynamic Mechanical ◽  
Layer Structures

Two-step casting method was developed for preparing quasi constrained layer damping structural polymeric composite. Quasi constrained layer structural piezoelectric ceramic P82/carbon black(CB)/epoxy resin(EP) composites were successfully prepared when the ceramic content was less than 30% in volume. Dynamic mechanical analysis(DMA) showed that the composites with quasi constrained layer structure exhibited perfect damping properties. When the piezoelectric ceramic P82 volume fraction was 10%, the composite showed the highest loss factor peak value of 1.182, the widest damping temperature range of 44.2°C, and the largest loss area of 32.17. The storage moduli of composites with quasi constrained layer structures were higher than that with non quasi constrained layer structure.

Ductile Tantalum Oxide Protective Coatings

1984 ◽  
Vol 40 ◽  
Author(s):  
Hani L. Rizkalla ◽  
Stephen T. Wellinghoff
Keyword(s):  
Electron Beam ◽  
Tensile Strain ◽  
Protective Coatings ◽  
Tantalum Oxide ◽  
Atomic Motion ◽  
Polymer Substrates ◽  
Dynamic Mechanical ◽  
The Face ◽  
Mechanical Spectra ◽  
Similar Dynamic

AbstractAmorphous, anodic Ta2O5 films of 400 A thickness deposited on deformable polymer substrates deformed by microshear banding even at 5–10% tensile strain. Electron beam evaporated Ta2O5 (EBE) were considerably more brittle in tension on the same substrates, fracturing at strains less than 1%. Even though both films were amorphous to electron diffraction the EBE vibrational spectrum in the Ta2O5 region (900 cm-1 - 400 cm-1) was more reminiscent of thermally oxidized material that appears to have greater microstructural order. A significant dynamic mechanical peak was observed at 60–90°C for both Al and Ta foils coated with either anodic or EBE Ta2O5 films. This process was assigned to relaxation of interfacial stresses induced by atomic motion in the oxide in this temperature range. In the face of the rather similar dynamic mechanical spectra we suspect that the presence of a greater Packing heterogeneity might explain the greater brittleness of the EBE films.

Dynamic Mechanical Characterization of CF/GF Hybrid Reinforced Polymeric Composite Structures

2012 ◽  
Author(s):  
Dana Luca Motoc
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Volume Fraction ◽  
Loss Modulus ◽  
Glass Fibers ◽  
Reference Sample ◽  
Polymeric Composite ◽  
Relative Volume Fraction ◽  
Dynamic Mechanical

The importance of dynamic mechanical analysis (DMA) as a research tool in the study of polymeric composite structures behavior has been already demonstrated in the literature. Many papers were approaching the relaxation phenomenon within the polymer based composite structures and thereby their behavior under various conditions of stress and temperature. Supplementary, the effect of fillers geometry, orientation and volume fraction have been extensively approached while considering the micromechanical level and their role in the mechanical properties were suitable stated. Hybridization of two different fillers has proven to an effective method in material design allowing their developers to tailor their properties according to the application driven imposed requirements. The herein paper attempts to present a comparative study centered on the development and characterization of a hybrid polymeric composite structures made up from different combinations of carbon and glass fibers by evaluating their dynamic mechanical properties. The samples were measured using the Dynamic Mechanical Analyzer (DMA) from NETZSCH-DMA 242 C, in the 3-point bending mode, nitrogen atmosphere, at a scanning rate of 3 K/min from −40 to 180° C with a fixed frequency of 1 Hz. Storage and loss modulus, loss tangent were recorded as function of temperature both on longitudinal and transverse direction of the unidirectional carbon fibers, in two consecutive heating cycles. A reference sample was set up to aid the comparison analysis, made entire from one filler type. The effect of the fillers type, fillers relative volume fraction and temperature on the storage and loss moduli will be deeply investigated.

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