Modern Physical Metallurgy and Materials Engineering Part 15

Tham khảo tài liệu 'modern physical metallurgy and materials engineering part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Materials for sports 411 Composite woods have been made from CFRP. These heads which emphasize lightness and strength are similar in shape and style to classic wooden heads and have a similar placing of the centre of gravity. Typically they have wear-resistant alloy sole plates and a foam-filled core. Compression moulding or injection moulding are used in their manufacture. Iron-type club heads The relatively narrow heads for irons are usually made from steels and copper alloys which are shaped by either hot forging or investment casting. Stainless materials include 17Cr-4Ni and AISI Types 431 and 304. As an alternative to the traditional blade-type head cavity-back irons provide peripheral weighting. In a recent innovation a non-crystalline zirconium-based alloy2 containing Cu Ti Ni and Be has been used for the heads of irons and putters . This alloy has high specific strength and good damping capacity and can be successfully vacuum cast in a glassy state without the need for ultra-fast freezing rates. Putting heads Although a set of golf clubs may only contain one putter it is typically used for 40-50 of the strokes in a game. The dynamic demands are less than those for woods and irons consequently putter designs have tended to be less innovative. Design parameters include sweet spot weight distribution bending stiffness etc. as previously. Alloys used include stainless steel 17Cr-4Ni manganese bronze Cu-Zn-Mn and beryllium-copper Cu-2Be . Archery bows and arrows The longbow For centuries archery bows have combined design skill with knowledge of material properties. From the evidence of many well-preserved yew longbows retrieved in 1982 from the wreck of the Tudor warship Mary Rose which sank in Portsmouth harbour 1545 we know that the original seasoned stave was shaped in such a way as to locate sapwood on the outer convex back of the bow and darker heartwood at the concave belly surface. When the bow was braced and drawn this natural .

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