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CR LAURENCE Z-SERIES GLASS CLAMPS (03/27/2014) Page 10 of 19 <br /> For Zinc alloy cast parts (Casting number Z806-1 and Z806-2) <br /> Zamak 3,ASTM B240-07 Alloy 3 —AG 40A UNS 233521 <br /> Strength properties: F„= 30.2ksi <br /> Allowable bending strength, Fba= 12,000 psi (based on preventing fatigue fracture) <br /> All zinc alloy die cast parts are made with the same die cast only the finish varies. <br /> Failure modes are the same as for <br /> the Z906 stainless steel casting. , 2 1/8"tsa.al 1 1,4-[6.01 4, <br /> Controlling failure mode is from <br /> bending failure at point where the <br /> body arm meets the base. M 05$ .092osz <br /> Lommil <br /> C392 2,125 N <br /> 175 <br /> .� <br /> army <br /> Controlling section properties: 1rs-[ $-ol <br /> IAx=0.00073 in4 CASTING <br /> S,„=0.00357 in3 <br /> Ma=FfS = 12ksi*0.00357in3=42.8"# <br /> Determine maximum horizontal service load <br /> Hs=Ma/(0.58") =42.8"#/(0.58") =73.9# <br /> Maximum wind load=73.9# <br /> Determine yield moment: <br /> My=FyS = 30.2ksi*0.00357in3 = 107.8"# <br /> Yield load: <br /> Hy =My/(0.58") = 107.8"#/(0.58") = 185.9# <br /> Maximum live load= 185.9/1.67 = 111# <br /> For failure: <br /> Z=0.0087in3 <br /> Mn=0.0087*30.2ksi=263"# <br /> Failure load M„/(0.58") =263"#/(0.58")=453# <br /> Ultimate strength and failure mode verified by destructive testing. <br /> EDWARD C.ROBISON,PE <br /> 10012 Creviston Dr NW <br /> Gig Harbor,WA 98329 <br /> 253-858-0855/Fax 253-858-0856 elrobison@narrows.com <br /> 0331 <br />