Microstructural evaluation and flexural mechanical behavior of pultruded glass fiber composites

Evaluation of the Effects of Fluids Upon the Flexural and Parallel-plate Loading Behavior of Glass Fiber Reinforced-vinyl Ester Resin Matrix Composite Pipes

“…It is important to highlight here that the tubes from where the specimens were machined are 2 m long, and after the microstructural analysis performed, large variation of the fiber distribution is likely to be found along the tube's length. This spatial variation of fiber and resin on a real commercial product was, indeed, observed for other composites, even those that have a much more homogeneous microstructure 4 . Figure 6 shows a tested specimen, where one can see that the failure begins at the surface of the composite, at the outermost layer at the tensile side of the test specimen, as it should be.…”

“…Polymers and polymer composites can, however, degrade when exposed to several common environments that they can be brought into contact during their service life. Ultraviolet radiation [2][3][4] and humidity 5 are the most common of the service environments that one could expect a resin matrix composite pipe to be exposed to. Their effects and prevention are well discussed in the literature 6 .…”

Microstructural Characterization and Evaluation of Thermal, Mechanical and Wear Properties of Pupunha (Bactris Gasipaes) Pseudostem

“…The flexural mechanical properties obtained are shown in Table 1, where the properties of common Brazilian hardwoods -jatobá (Hymenaea courbaril) and maçaramduba (Manilkara amazonica) [31] and the properties of two hardwood -black oak and white ash -and two softwood -yellow cedar and balsam fir -from the northern hemisphere are also listed for comparison [30]. The value of the flexural properties of a typical glass-fiber composite with fiber volume fraction of 0.30 is also included at the Table [32]. One can observe that pupunha has a very high strength of rupture, even higher than the values of the hardwoods usually used to manufacture high quality furniture.…”