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Materials Selection and Design Considerations Introduction One of the most important tasks of an engineer could be the materials selection with regards to component design and it is essential that the engineering student be familiar with these procedures and protocols that are normally employed in the process. Materials Selection for a Torsionally Stressed Cylindrical Shaf Strength Considerations - Torsionally Stressed Shaf Shear stress at radius r is defined by the equation Here, J is the polar moment of inertia, which for a solid cylinder is Thus, A safe design calls for the shaft to be able to sustain some twisting moment without fracture. We replace the shear stress in Eq. 22.3 with shear strength of material divided by factor of safety. The mass of any quantity of material is the just the product of its density and volume. In a cylinder, The radius of the shaft in terms of its mass is just It is sometimes preferable to work with what is termed a performance index. Materials Selection Charts - These are plots of the values of one material property versus those of another property.
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Material cost is another important consideration in the selection process. One way to determine materials cost is by taking the product of the price (on a per-unit mass basis) and the required mass of material. OTHER PROPERTIES Stiffness to mass performance analysis where G is the shear modulus AUTOMOBILE VALVE SPRING Spring – stores mechanical energy as it is initially elastically deformed and the recoup this energy at a later time as the spring recoils. D = coil center to center diameter , d = diameter K w = force independent constant In response to the force, the coiled spring will experience deflection, assumed to be totally elastic. VALVE SPRING DESIGN AND MATERIAL REQUIREMENTS Goodman’s law One common spring alloy is an ASTM 232 chrome-vanadium steel, for this alloy, for diameter in inches, tensile strength is Computation of mean stress is made using
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Max shear stress could be determined by taking Actual stress amplitude FAILURE OF AN AUTOMOBILE REAR AXLE Introduction
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Christopher Reinemann
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