The challenge is writing a program to calculate sectional properties using standard AutoCAD hatching commands.Because all other sectional properties can be determined once you find the area, centroid, and first and second moments of area, the task is to calculate these values first. One way to write such a program is with AutoCAD’s AutoLisp language, which directly accesses a drawing’s database. Programs can be written within CAD packages to find sectional properties for any cross section. But when shapes are complex, more advanced methods are required to determine the necessary values. In fact, formulas for common cross sections like I-beams and other shapes are found in most mechanical design reference books. GardnerAssistant Professor of EngineeringUnited States Merchant Marine AcademyKings Point, N.Y.In the mechanical design of equipment and systems, sectional properties, such as centroid and moment of inertia, are necessary for calculating stresses, deflections, and buckling.
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