In reference to the Question above, concerning “deflection strength” and alloys 6063-T5 vs. 6063-T6, please clarify: are deflection and strength two different issues?
Yes. Deflection and strength are two distinct problems. Deflection requires shape design; strength requires alloy and temper selection. Deflection is controlled by shape design, i.e. the deeper the shape in the plane of bending, the less the deflection. A 6063-T5, 6063-T6 and 6061-T6 alloy of equal proportion and same shape will deflect the same under identical loads as illustrated in the following formula: Maximum deflection at center (PL³) (48 El) Strength, on the other hand, is greatly related to which alloy and temper are used in terms of allowable stress. Since stresses depend on the application, an engineer should always be consulted for the correct stress to use for all critical applications.
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