tailieunhanh - Materials Selection and Design (2010) Part 11

Tham khảo tài liệu 'materials selection and design (2010) part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Properties Needed for the Design of Static Structures Mahmoud M. Farag The American University in Cairo Introduction ENGINEERING DESIGN can be defined as the creation of a product that satisfies a certain need. A good design should result in a product that performs its function efficiently and economically within the prevailing legal social safety and reliability requirements. In order to satisfy such requirements the design engineer has to take into consideration a large number of diverse factors Function and consumer requirements such as capacity size weight safety design codes expected service life reliability maintenance ease of operation ease of repair frequency of failure initial cost operating cost styling human factors noise level pollution intended service environment and possibility of use after retirement Material-related factors such as strength ductility toughness stiffness density corrosion resistance wear resistance friction coefficient melting point thermal and electrical conductivity processibility possibility of recycling cost available stock size and delivery time Manufacturing-related factors such as available fabrication processes accuracy surface finish shape size required quantity delivery time cost and required quality Figure 1 illustrates the relationship among the above three groups. The figure also shows that there are other secondary relationships between material properties and manufacturing processes between function and manufacturing processes and between function and material properties. Fig. 1 Factors that should be considered in component design. Source Ref 1 The relationship between design and material properties is complex because the behavior of the material in the finished product can be quite different from that of the stock material used in making it. This point is illustrated in Fig. 2 which shows that in addition to stock material properties production method and component geometry have direct influence on the behavior of .

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