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Twin-wall polycarbonate sheeting is used primarily as an alternative to glass. Weight, flexibility, and impact strength are all benefits of using polycarbonate as a glass substitute. [10] Applications include those in which thermal insulation is necessary while still allowing light transmittance.
Polycarbonate is a durable material. Although it has high impact-resistance, it has low scratch-resistance. Therefore, a hard coating is applied to polycarbonate eyewear lenses and polycarbonate exterior automotive components.
Brittle materials have low toughness as a result of the small amount of plastic deformation they can endure at any rate. However, ductile materials may behave like brittle materials under high-energy impact, hence the need for this kind of test. The test conditions are governed by many variables, most importantly:
According to the classical theories of elastic or plastic structures made from a material with non-random strength (f t), the nominal strength (σ N) of a structure is independent of the structure size (D) when geometrically similar structures are considered. [1] Any deviation from this property is called the size effect.
Some design is based on the assumption that materials will behave plastically. [4] A plastic material is one which does not obey Hooke's Law, and therefore deformation is not proportional to the applied load. Plastic materials are ductile materials. Plasticity theory can be used for some reinforced concrete structures assuming they are ...
The contributing factors that improve impact resistance is particle size, particle shape and particle rigidity. Fibers improve impact resistance the most due to their large aspect ratio. Low hardness fillers will decrease impact strength. Particle size, within a specific range can increase the impact strengths based on the filler material. [13]
For all notch types, a key parameter in governing stress concentration and failure in notched materials is the notch tip curvature or radius. [1] Sharp tipped V-shaped notches are often used in standard fracture toughness testing for ductile materials, polymers and for the characterization of weld strength. The application of such notches for ...
Draft angle design is an important factor when designing plastic parts. Because of shrinkage of plastic material, injection molded parts have a tendency to shrink onto a core. This creates higher contact pressure on the core surface and increases friction between the core and the part, thus making ejection of the part from the mold difficult.
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