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8.6 A center-cracked plate of AISI 1144 steel has dimensions, as detined in Fig.8.12(a). of 1) /h - 40 mm and - 15mr 4() mni and ,-: 15 mn. F(r a safety fact(rofthree against brittle fracture. what is the maximum permissible force P on the plate if the crack half-length a is (a) 10mm. and (b)24 mm?So2(ab) S( (b 0.2 0,4 0.6 0.8 1.0 Values for small b and linits for 10 % accuracy: (alb s 0.4) (alb s 06) (a/b s0.13) Expressions for any a alb: (a) F 1-0.5x +0.32602 (b) F- (1 +0.122 (e) F0265(1 -a*+0.857+0.265a (h/b 15) (h/b I) Figure 8.12 Stress intensity factors for three cases of cracked plates under tension. Geometries, curves, andequations labeled (a) all comespond to the same case, and similarly for (b) and (c). (Equations as collected by [Tada 8sl pp. 2.2, 2.7, and 2 11.)

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