Fiber reinforced thermoset laminate

The so-called spring-forward phenomena are observed in continuous fiber reinforced thermoset laminates. These materials have characteristic uneven dis-... 

Unlike ductile metals, composite laminates containing fiber-reinforced thermosetting polymers do not exhibit gross ductile yielding. However, they do not behave as classic brittle materials, either. Under a static tensile load, many of these laminates show nonlinear characteristics attributed to sequential ply failures. One of the difficulties, then, in designing with laminar composites is to determine whether the failure of the first ply constitutes material failure, termed first-ply failure (FPF), or if ultimate failure of the composite constitutes failure. In many laminar composites, ultimate failure occurs soon after first ply failure, so that an FPF design approach is justified, as illustrated for two common laminar composites in Table 8.9 (see Section 5.4.3 for information on the notations used for laminar composites). In fact, the FPF approach is used for many aerospace and aircraft applications. 

Glass Fiber-Reinforced Thermosetting Resins Hand Laminating... 

Fiber reinforced thermosetting polymer composites have been used in the form of laminate, sandwich, grid stiffened, stitched, Z-pinned, three-dimensional (3-D) woven fabric, and hybrid structures. In addition to carrying the designed static/dynamic loads, most composite stmcmres experience some kind of low or high velocity impact incidents during their life cycle. A low velocity impact is not uncommon. For example, dropping a tool on to a composite stmcmre... 

Diffusion related damage in glass fiber-reinforced thermosets caused by acids and water exhibit parallels. The fact that even dilute acids penetrate, e.g., along individual glass fibers, into laminates and irreversibly damage fibers and interfacial adhesion has been documented in a film presentation [813], Figure 5.275. 

The results obtained by this test method may serve as a guide in, but not as the sole basis for, predicting the possible performance of the particular glass-fiber-reinforced thermosetting resin laminate in the one-side exposure to the specific environment under evaluation. No attempt has been made to incorporate into the test method aU of the factors that may enter into the serviceability of a glass-fiber-reinforced resin structure when subjected to chemical environments. 

Corrosion Resistant Fiber-Reinforced Plastic (FRP). Fiber glass reinforcement bonded with furfuryl alcohol thermosetting resias provides plastics with unique properties. Excellent resistance to corrosion and heat distortion coupled with low flame spread and low smoke emission are characteristics that make them valuable as laminating resins with fiber glass (75,76). Another valuable property of furan FRP is its strength at elevated temperature. Hand-layup, spray-up, and filament-win ding techniques are employed to produce an array of corrosion-resistant equipment, pipes, tanks, vats, ducts, scmbbers, stacks, and reaction vessels for industrial appHcations throughout the world. 

TABLE 25-19 Typical Thermoset Fiber-Reinforced Laminate Properties... 

Plastics - Determination of temperature of deflection under load - Part 3 High-strength thermosetting laminates and long-fiber-reinforced plastics Plastics - Thermoplastic materials - Determination of Vicat softening temperature(yS 7 ... 

Curable thermosetting resin compositions containing PPE are useful in electrical applications because they exhibit low dielectric constants. Such compositions are used as fiber reinforced prepregs, for example as copper-clad laminates suitable for printed circuit boards (PCB)s. 

Plastics - Abrasion-free asbestos is used to thicken and reinforce thermosets, providing heat, tear, and electrical resistance, low heat deformation, high strength, and stif iess. Short and float fibers are used as fillers mat, felt, paper and cloth are impregnated with resin to form laminates. 

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