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Se o EAN 13 Recognizer In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. EAN13 Creation In None Using Barcode encoder for Software Control to generate, create EAN13 image in Software applications. 1 = EAN / UCC  13 Decoder In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. EAN13 Drawer In Visual C# Using Barcode encoder for .NET framework Control to generate, create EAN13 Supplement 5 image in Visual Studio .NET applications. m 2.718 Generate EAN13 Supplement 5 In .NET Using Barcode encoder for ASP.NET Control to generate, create GTIN  13 image in ASP.NET applications. GS1  13 Printer In VS .NET Using Barcode drawer for VS .NET Control to generate, create EAN13 image in .NET framework applications. Se Su
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LOAD CAPABILITY CONSIDERATIONS
TABLE 29.12 Fatigue Strength Ratio S f /Su as a Function of Cycles to Failure for Annealed 4340 Steel tensile stress amplitude as ordinate. The stress amplitude is that present in a uniform tension that induces the same distortionenergy amplitude (octahedral shear amplitude) as is present in the critical location of the machine part. The steady stress is that stress present in a uniform tension that induces the same steady distortion energy (steady octahedral shear) as is present in the critical location of the machine part.The plotting process involves conversion of the actual stress state to the equivalent uniform tension circumstances. The von Mises axial tensile stress that has the same distortion energy as a general threedimensional stress field is, in terms of the ordered principal stresses 1, 2, and 3, v = ( 1 2)2 + ( 2 3)2 + ( 3 1)2 2 (29.25) If one of the principal stresses is zero and the other two are A and B, then
2 2 v = ( A + B A B)1/2 (29.26) If the axes xy are not principal, then
2 2 v = ( x + y x y + 3 2 )1/2 xy
(29.27) If the concern is yielding, then yielding begins when the von Mises stress equals the tensile value of Sy. If the concern is fatigue, then failure occurs when the von Mises steady stress and amplitude equal the simple steady tension and amplitude that result in failure. If Eq. (29.26) is equated to a critical value cr, then 2 2 2 A + B A B = cr
Treating the preceding equation as a quadratic in A, we have A = 1 1 B 2 2 (2 cr)2 2 3 B (29.28) On a plot in the A B plane, the criticalstress magnitude can be observed at six places, three tensile and three compressive.The locus is an ellipse with the major axis Downloaded from Digital Engineering Library @ McGrawHill (www.digitalengineeringlibrary.com) Copyright 2004 The McGrawHill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. STRENGTH UNDER DYNAMIC CONDITIONS 29.29
STRENGTH UNDER DYNAMIC CONDITIONS
FIGURE 29.18 The distortionenergy criticalstress ellipse. For any point A, B on the ellipse, the uniaxial tension with the same distortion energy is the positive abscissa intercept cr, 0. having a unity slope, as depicted in Fig. 29.18. The octahedral stress (von Mises stress) tensile equivalent is the Aaxis intercept of the ellipse. For the Goodman diagram, the transformation is to move the point representing the stress condition A, B to the abscissa, while staying on the ellipse. This is done by Eq. (29.26). For threedimensional stress, the surface is an ellipsoid in the 1 2 3 space, and the transformation is accomplished by Eq. (29.25). Figure 29.19 shows the conversions of the steadystress condition and the stressamplitude condition to the respective simpletension equivalents for the purposes of plotting a point representing the equivalent stress state on the modified Goodman diagram. In Fig. 29.20 an element on a shaft sees a steady torque and fully reversed bending stresses. For the steadystress element, xym = 16T d 3 Am = 16T d 3 Bm = 16T d 3

