scholarly journals Fiber Orientation and Fillers Effects on Specific Heat of Fabric Reinforced Hybrid Epoxy Composites

2019 ◽  
Vol 42 (2) ◽  
pp. 32-38
Author(s):  
Marina BUNEA ◽  
◽  
Mihaela Claudia GOROVEI ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
...  
Keyword(s):  
Specific Heat ◽  
Fiber Orientation ◽  
Epoxy Composites

scholarly journals An Experimental Investigation of Thermal Properties of Fabric Reinforced Epoxy Composites

2019 ◽  
Vol 57 (2) ◽  
pp. 159-168
Author(s):  
Iulian Gabriel Birsan ◽  
Vasile Bria ◽  
Marina Bunea ◽  
Adrian Circiumaru
Keyword(s):  
Experimental Investigation ◽  
Specific Heat ◽  
Fiber Orientation ◽  
Linear Expansion ◽  
Epoxy Composites ◽  
Linear Expansion Coefficient ◽  
Thermal Coefficient ◽  
Thermal Measurements ◽  
Thermal Linear Expansion Coefficient ◽  
Coefficient Of Linear Expansion

Specific heat and thermal linear expansion coefficient of epoxy composites reinforced with carbon, aramid, glass and hybrid fabrics with unfilled and filled stratified matrices were studied. The thermal measurements of specific heat were performed with Differential Scanning Calorimeter (DSC instrument) and those of thermal coefficient of linear expansion were realized with Thermomechanical Analyzer (TMA instrument). It was analyzed the influence of fiber orientation at various angles (�15�, �30� and �45�) and the effects of two types of filler mixtures added into polymeric matrix on the thermal behavior of composite materials. It was found that in case of epoxy matrix the added filler mixtures reduced its thermal coefficient of linear expansion and had an insignificant influence on specific heat. In case of epoxy composites reinforced with fabrics, the fiber orientation and fillers addition showed different effects on the investigated thermal parameters in dependence of the used reinforcement types.

Effect of fiber orientation on the shear behavior of glass fiber/epoxy composites

2015 ◽  
Vol 65 ◽  
pp. 789-795 ◽  
Author(s):  
José Humberto S. Almeida ◽  
Clarissa C. Angrizani ◽  
Edson C. Botelho ◽  
Sandro C. Amico
Keyword(s):  
Glass Fiber ◽  
Fiber Orientation ◽  
Shear Behavior ◽  
Epoxy Composites

Thermal properties of autoclave and out-of-autoclave carbon fiber-epoxy composites with different fiber weave configurations

2018 ◽  
Vol 52 (29) ◽  
pp. 4075-4085 ◽  
Author(s):  
Ronald Joven ◽  
Bob Minaie
Keyword(s):  
Thermal Expansion ◽  
Thermal Properties ◽  
Carbon Fiber ◽  
Specific Heat ◽  
Volume Fraction ◽  
Light Flash ◽  
Epoxy Composites ◽  
Fiber Volume ◽  
Out Of Autoclave ◽  
Carbon Fiber Epoxy

Thermal expansion, specific heat, diffusivity, and conductivity of carbon fiber-epoxy composites were studied using autoclave and out-of-autoclave prepregs with three different fabric weaves including unidirectional, eight-harness satin, and plain weave. For this purpose, light flash analysis was utilized where the implications of using anisotropic materials were studied. Results indicated that density, thermal expansion, conductivity, and diffusivity were strongly influenced by the fiber configuration of the sample. This phenomenon was attributed to the difference in fiber volume fraction induced by the different weaves of the fabric. Nevertheless, specific heat was similar for all the samples regardless of fabric type or resin formulation. Finally, thermal properties of tetrafluoroethylene release film were presented to analyze the tool-part heat transfer during manufacturing. This release film showed thermal conductivity three times lower than carbon fiber-epoxy samples indicating that the film could be an important contributor to thermal lag between tool and part.

Damping Analysis of Unidirectional Carbon/Flax Fiber Hybrid Composites

2018 ◽  
Vol 10 (05) ◽  
pp. 1850050 ◽  
Author(s):  
Mariem Ben Ameur ◽  
Abderrahim El Mahi ◽  
Jean-Luc Rebiere ◽  
Moez Abdennadher ◽  
Mohamed Haddar
Keyword(s):  
Fiber Orientation ◽  
Close Agreement ◽  
Hybrid Composites ◽  
Flax Fiber ◽  
Epoxy Composites ◽  
Damping Properties ◽  
Element Analysis ◽  
Damping Coefficients ◽  
Hybrid Laminates ◽  
Vibration Tests

The purpose of the present paper is to study the effect of hybridation, stacking sequences and fiber orientation on the damping properties of unidirectional carbon/flax fiber reinforced epoxy composites. Non-hybrid and hybrid laminates with different stacking sequences were produced by molding vacuum process. Free vibration tests with an impulse technique were performed on test specimens to investigate the dynamic behavior. Finite element analysis was used to model damping to evaluate the different energies dissipated in the material layer directions of the carbon/flax composites. Close agreement was found between the experimentally measured values and those derived from the numerical simulation for the damping coefficients. The results obtained show that flax layers had a significant effect on damping properties.

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