tailieunhanh - Engineering Materials vol 2 Part 13

Tham khảo tài liệu 'engineering materials vol 2 part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Design with materials 291 be designed to snap together making assembly fast and cheap. And by accurately sizing the mould and using pre-coloured polymer no finishing operations are necessary. So great economies of manufacture are possible polymer parts really can be cheap. But are they inferior Not necessarily. Polymer densities are low all are near 1 Mg m-3 they are corrosion-resistant they have abnormally low coefficients of friction and the low modulus and high strength allows very large elastic deformations. Because of these special properties polymer parts may be distinctly superior. Composites overcome many of the remaining deficiencies. They are stiff strong and tough. Their problem lies in their cost composite components are usually expensive and they are difficult and expensive to form and join. So despite their attractive properties the designer will use them only when the added performance offsets the added expense. New materials are appearing all the time. New polymers with greater stiffness and toughness appear every year composites are becoming cheaper as the volume of their production increases. Ceramics with enough toughness to be used in conventional design are becoming available and even in the metals field which is a slowly developing one better quality control and better understanding of alloying leads to materials with reliably better properties. All of these offer new opportunities to the designer who can frequently redesign an established product making use of the properties of new materials to reduce its cost or its size and improve its performance and appearance. Design methodology Books on design often strike the reader as vague and qualitative there is an implication that the ability to design is like the ability to write music a gift given to few. And it is true that there is an element of creative thinking as opposed to logical reasoning or analysis in good design. But a design methodology can be formulated and when followed it will .

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