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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.

Annular snap joints A typical application for annular snap joints is in lamp housings (Fig. 6). Here, quite small undercuts give joints of considerable strength. Fig 5: Torsion snap joint on a housing made of Makrolon polycarbonate Fig 6: A continuous annular snap joint offers a semi-hermetic seal and is better for single assembly applications A

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