Fracture and Fracture Mechanics. Case Studies, Edition: 1st by R. B. Tait and G. G. Garrett (Eds.)

By R. B. Tait and G. G. Garrett (Eds.)

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4. Fracture face of piston. SERVICE TESTING Some difficulty was initially experienced in instrumenting the retarder piston for the service tests. The internal pressure gradients developed were in excess of 15,5 MPa, and special measures had to be taken to prevent internal pressure loss due to leakage and damage to the delicate strain gauge leads under dynamic con­ ditions. Furthermore, the operating characteristics of the component were not to be significantly altered by the instrumentation. The piston, after instrumen­ tation, is shown in Fig.

G. (1983). "Effects of Ageing on the DuctileFracture Mechanism in a High Strength Alloy Steel (300M)". , 31, ppl861. Hippsley C A . E. F. (1982). "Advance in the Physical Metallurgy and Applications of Steels". The Metals Society pl47-155. Hippsley C A . F. C. (1982). , 30, pp641. Irwin G. (1957). "Analysis of Stresses and Strains Near the End of a Crack Traversing a Plate", Trans. Am. S o c Mech. , Jnl. Appi. , pp361-364. J. and Wright J . C (1977). "Fracture Toughness Approach to Steel Castings Quality Assurance", Metals Technology Sept.

The local stress, σ. , at a small distance, r, ahead of the tip of an embedded through-thickness crick of length 2a, lying normal to a uniform applied tensile stress, σ , in an infinite body is given Pp by: a±. = K(27ir)"^ f±. (Θ) + series where Θ is the angle to the line of crack extension. 12 a Ota)* (4) app Fracture toughness testpieces contain a through-crack of length a, in a testpiece of width, W, and, here, account must be taken of the free surface to obtain the form: K = σ Υ (a/W) (5) app Where Y is known as the compliance and is tabulated for standard testpiece geometries.

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