Transcription of Snap-Fit Book Final 11-05
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Snap-Fit Book Final 11-05
3 The illustration above shows a photograph oftwo Snap-Fit models taken in polarizedlight; both have the same displacement (y) and deflective force (P).Top:The cantilever arm of unsatisfactorydesign has a constant cross section. The non-uniform distribution of lines (fringes)indicates a very uneven strain in the outerfibers. This design uses 17% more materialand exhibits 46% higher strain than the opti-mal :The thickness of the optimal Snap-Fit arm decreases linearly to 30% of the orig-inal cross-sectional area. The strain in theouter fibers is uniform throughout the lengthof the Common features Types of snap joints Comments on dimensioningBCantilever Snap Joints Hints for design Calculations Permissible undercut Deflection force, mating force Calculation examplesCTorsion SnapJoints Deflection Deflection forceDAnnular SnapJoints Permissible undercut Mating force Calculation exampleEBoth Mating PartsElasticFSymbolsContentsPage 2 of 26 Snap-Fit Joints for Plastics - A Design GuideCommon featuresSnap joints are a very simple, economicaland rapid way of join-ing two different com-ponents.
K = geometric factor (see Fig. 10) Notes 1) These formulae apply when the tensile stress is in the small surface area b. If it occurs in the larger surface area a, how-ever, a and b must be interchanged. 2) If the tensile stress occurs in the convex surface, use K2, in Fig. 10; if it occurs in the concave surface, use K1, accordingly.
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