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golfclub-1_img_0 - James MDehP Paul M Mommy James W Martin...

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Unformatted text preview: James MDehP Paul M. Mommy James W. Martin Carpenter homology Carp. Reading Pa. are key to improving perfor— mance of olf club woods and irons. because ey permit the design of heads tifitarelighler, larger, andotter yeaterenergy transfer. All manufac- nu'ersarelooldngfortl'ieulfimatenew - mateiial that would achieve the most coveted of all player objectivea gleater distance and accuracy ofi the tee or fairway. This discussion is limited to golf club [ace plates, although the authors acknowledge the usefulnesa of var- ious excellent metals and composites fer adieu: sodium. of the head and shaft as well. No matter what the head de- sign, the club head face is key to flight ofthe golfbalLbecausethatistheair- fiaoe that makes the all-important con- tact with the bail Alloys evaluated Many high—tech materials have been insr ' and selected for the heads of rem-it linesof golf clubs. Two stand out asmainstaysin club design: the litaniurn alloy Ti-GAI-EV, and the stainless steel alloy 15'Cr-éNi. However. two next-generation al- loys have recently beenirflroduted to the golf industry. Originally deveh oped as candidates for aerospace ap- plicaiim‘o, the alloys are Carpenter AerMet alloy and ter Custom 465 slainless. Both oi aerospace alloys offer a valuable oombmation of properties forclubhead design. They ave made a significant impact in golfing since they were adopted by both club designers and manufao turers {Fig.1}. Carp enter AerMet alloy 15 a pre- mum—melted, ulna-highsu'ength else] that was developed initially as a candidate for the landinggear ofU.S. Navy carrier—based F—‘lB EIF jet ‘ifitmmbertfflfihi ifliflfflfii‘iflflfli Golf club face plate alloys Fig.1— New Oriiimr irons and umdsm‘emrdewithfirzireertsqffluwnter Custom-£55 strain-rises steel. Thiseliaypmaides a sweriarmnhauaiaacfsmagfhmd massages. fighters. For a wide Trariety of com- mercial as well as military applica- tions. it has offered a unique omnbi— nation of high strength and haninees, fracture tough-less, exceptional duo tility. and resistance to both fatigue and sense-corrosion cracking. Custom-165 stainless is a premium melted, martensitic, stainless steel. Wi‘len aged to the H‘ mm condition. it profides a superior combination ofhigh strength, fracture W and resistancetosu'ess-mr— rosion cradcing com with other high-strength PH stainless alloys. In its H-BEHJ condition. with 1?95 MPa {MUM} ultimate tensile it Still Ems high mm strength and fracture For those who design club heads as well as diose who swung them, we have documented the mechanical properties of these four {T able IJssarnearsofcon‘qiaring 'likely . performance'lhedatapmvideskey ADVANCED-MATERIALS a PROCESSES if»??? age-hardenable - measurements of strmgth, hardness, density. elongation elasticity and strength-to—weight ratio. Typical diemjcal composifions for the alloys are given in Table 2. Pmperties compared The graph infiglshows ihehard- nessendtensilestrengflilevelsofthe four alloys in our-matrix. Assuming thatthe distance a golfbail is driven relates In the hardness and tensile sanmgth of the face insert, more of the energy of a swing should be trans- ferredtofliebailwifli the twn aero- space alloys. Aerlvlet has a hardness of54l-IRC and fissile Shfl'lglh 01'2033 MPa (Ballad), whileCilstmn-ififihas a hardness 51 I-IRC and tensile of 1% MPa [260 hail. Values for these characteristics are signifi- cantly lower' in both conventional ITCr-sNi slamlem endii'se'Ti—fiAl—sv ...
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