TAILIEUCHUNG - Engineering - Materials Selection in Mechanical Design Part 6

Tham khảo tài liệu 'engineering - materials selection in mechanical design part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 6 --------------------------- Materials selection case studies Introduction and synopsis Here we have a collection of case studies illustrating the screening methods of Chapter 5. Each is laid out in the same way a the problem statement setting the scene b the model identifying function objectives and constraints from which emerge the property limits and material indices c the selection in which the full menu of materials is reduced by screening and ranking to a short-list of viable candidates and d the postscript allowing a commentary on results and philosophy. Techniques for seeking further information are left to later chapters. The first few examples are simple but illustrate the method well. Later examples are less obvious and require clear identification of the objectives the constraints and the free variables. Confusion here can lead to bizarre and misleading conclusions. Always apply common sense does the selection include the traditional materials used for that application Are some members of the subset obviously unsuitable If they are it is usually because a constraint has been overlooked it must be formulated and applied. The case studies are deliberately simplified to avoid obscuring the method under layers of detail. In most cases nothing is lost by this the best choice of material for the simple example is the same as that for the more complex for the reasons given in Chapter 5. Materials for oars Credit for inventing the rowed boat seems to belong to the Egyptians. Boats with oars appear in carved relief on monuments built in Egypt between 3300 and 3000 BC. Boats before steam power could be propelled by poling by sail and by oar. Oars gave more control than the other two the military potential of which was well understood by the Romans the Vikings and the Venetians. A computer-based exploration of these and other case studies can be found in Case Studies in Materials Selection by . Ashby and D. Cebon published by Granta Design .

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