PHED-3117EL Lecture Notes - Lecture 3: Sorbothane, Moleskin, Neoprene
27 Apr 2020
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Protection from forces: high velocity low mass: focal injury low velocity high mass: diffuse injury. Design factors that can reduce potential injury. Increase impact area: disperse impact area to another body part, limit the relative motion, add mass to the body part, reduce friction, absorb energy, resist the absorption of bacteria, fungus, and viruses. Low-density material: light and comfortable to wear, only effective at low levels of impact intensity. High-density material: less comfortable, less cushioning, can absorb more energy by deformation. Resilience: high, regain their shape after impact, used over areas subject to repeated impact, nonresilient or slow-recovery resilient, best protection, used over areas subject to one-time or occasional impact. Soft materials: light due to incorporation of air into material, examples: gauze padding, neoprene, sorbothane , felt, moleskin, and foam, open-cell vs. closed-cell foam. Hard materials: thermomoldable plastics able to be heated and shaped before rehardening, examples: orthoplast, thermoplast, casting materials.
