TAILIEUCHUNG - Engineering - Materials Selection in Mechanical Design Part 8

Tham khảo tài liệu 'engineering - materials selection in mechanical design part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 8-------------------------------- Shape case studies Introduction and synopsis This chapter like Chapter 6 is a collection of case studies. They illustrate the use of material indices which include shape. Remember they are only necessary for the restricted class of problems in which section shape directly influences performance that is when the prime function of a component is to carry loads which cause it to bend twist or buckle. And even then they are needed only when the shape is itself a variable that is when different materials come in different shapes. When all candidate-materials can be made to the same shapes the indices reduce to those of Chapter 6. Indices which include shape provide a tool for optimizing the co-selection of material-and-shape. The important ones are summarized in Table . Many were derived in Chapter 7 the others are derived here. Minimizing cost instead of weight is achieved by replacing density p by cmp where cm is the cost per kilogram. The selection procedure is first to identify candidate-materials and the section shapes in which each is available or could be made. The relevant material properties and shape factors for each are tabulated. The best material-and-shape combination is that with the greatest value of the appropriate index. The same information can be plotted onto Materials Selection Charts allowing a graphical solution to the problem one which often suggests further possibilities. The method has other uses. It gives insight into the way in which natural materials many of which are very efficient have evolved. Bamboo is an example it has both internal or microscopic shape and a tubular macroscopic shape giving it very attractive properties. This and other aspects are brought out in the case studies which now follow. Spars for man-powered planes Most engineering design is a difficult compromise it must meet as best it can the conflicting demands of multiple objectives and constraints. But in designing a .

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