By Hsu MD
AAOS Atlas of Orthoses and Assistive units by means of Hsu MD, John D., Michael, John, Fisk MD, John [Mosby,2008] (Hardcover) 4th variation [Hardcover]
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Additional info for AAOS Atlas of Orthoses and Assistive Devices, 4th Edition
Within certain limits, the strength and hardness of carbon steel are directly proportionate to the amount of carbon added. In addition to carbon, carbon steel contains manganese and traces of sulfur and phosphorus. Alloy steel To achieve desirable physical or chemical properties, other chemicals are added to carbon steel. The resultant product is known as alloy steel. In presenting some general characteristics distinguishing these alloys, it is necessary to define some terms commonly used to express them: Toughness: Ability to withstand shock force Hardness: Resistance to penetration and abrasion Ductility: Ability to undergo permanent changes of shape without rupturing Corrosion resistance: Resistance to chemical attack of a metal under the influence of a moist atmosphere The addition of elements can increase elasticity and tensile strength as well as improve surface finish and machinability.
As symmetrical molecules approach within a critical distance, crystals begin to form in the areas of densest packing. A crystallized area is stiffer and stronger; a noncrystallized (amorphous) area is tougher and more flexible. Other effects of increased crystallinity in a polyethylene polymer are increased resistance to creep, heat, stress cracking, and increased shrinkage after forming. In general, crystalline polymers are more difficult to process than amorphous polymers. They have higher forming temperatures and melt viscosities, and they tend to shrink and warp more.
For example, the moment of inertia for a rectangle about its centroidal axis is bh3/12 and the length of the centroid is h/2; therefore, the section modulus is bh2/6. Section moduli are given in Table 3-3. , a stirrup in terminal stance; Fig. , KAFO prescribed to control valgum; Fig. 3-22). The maximum torque in cantilevered (Fig. 3-21) and freely supported (Fig. 3-22) beams is given by: Tmax ¼ FL ð3-12Þ FL 4: ð3-13Þ Tmax ¼ 22 ð3-10Þ Section modulus Stresses in beams L s¼ ð3-9Þ 3 Materials science F F L/2 L F F L T = FL 2 T = FL F F L/2 Fig.