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delayed fracture

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Published: 01 August 2005
Fig. 2.95 Schematic stress corrosion delayed fracture curve (applied constant stress versus time to fracture) More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270084
EISBN: 978-1-62708-301-0
... the limited ductile nature of the material, near the cracked area shown in Fig. CH10.5 . On the interior of the fracture surface, cleavage fracture is seen ( Fig. CH10.7 ), indicating fast fracture. There was no evidence of delayed fracture on this surface. Fig. CH10.6 SEM fractograph near...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270162
EISBN: 978-1-62708-301-0
..., at which point the no indications of delayed failure in any of the areas examined. bottom plate became twisted before nal fracture of the longeron, thus separating the tail boom. The fracture of the strands of the control cable indicated equiaxed dimples typical of tensile overload (Fig. CH42.9...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270120
EISBN: 978-1-62708-301-0
... the remaining portion of the circumference. Region A showed evidence of delayed failure. The crack had initiated at the outer periphery of the strut in the region of transition and propagated inward before giving rise to the overload fracture. Fig. CH23.2 Fracture surface of the failed starboard strut...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270189
EISBN: 978-1-62708-301-0
... of the vane ( Fig. CH52.1 ). This fracture surface showed clear beach marks, indicative of delayed failure. Further, it was observed on the same runner, the vane diametrically opposite the fractured vane had developed a similar crack, about 3 in. in length, which was repair welded during the previous...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270078
EISBN: 978-1-62708-301-0
... of any delayed failure. Fig. CH7.3 SEM fractograph showing dimples characteristic of overload fracture Conclusion The rod failed by overload, possibly by a combination of tension and bending forces. Failure Analysis of Engineering Structures: Methodology and Case Histories Copyright ©...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270150
EISBN: 978-1-62708-301-0
... The blade had fractured at the root, with the fracture surface showing a conchoidal pattern indicating the delayed nature of fracture. The fracture had originated from the convex surface of the blade, almost from the middle portion, and progressed to about 80% of the cross section before final fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270146
EISBN: 978-1-62708-301-0
... inspection Testing Procedure and Results A portion of the fitting was cut and the crack was opened to observe the fracture surface. The fracture surface showed distinct crack front with discoloration characteristic of delayed failure. Scanning Electron Fractography and EDAX The fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.tb.ahsssta.t53700151
EISBN: 978-1-62708-279-2
... the capacity to distribute strains more uniformly, thereby delaying fracture and causing more stretching in the dome. Fig. 10.3 Forming limit diagrams for austenitic stainless and carbon steels. Source: Ref 10.3 Fig. 10.4 Photos of limiting dome height test for SS 900 and DP 750 steels...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270173
EISBN: 978-1-62708-301-0
... was opened by pulling apart the cracked region, and the fracture surface was ultrasonically cleaned and examined. Background What appeared to be a branching crack turned out to be two dif- ferent cracks, both showing features of delayed failure (Fig. A titanium alloy disc tted on the fourth stage...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270185
EISBN: 978-1-62708-301-0
... Abstract A pair of bolts on a connecting rod failed during a test run for a prototype engine. They were replaced by bolts made from a stronger material that also failed, one due to fatigue, the other by tensile overload. The fracture surfaces on all four bolts were examined using optical...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... and analysis fracture surfaces, secondary cracks, and other surface phenomena) Microscopic examination and analysis of fracture surfaces Selection, preparation, examination, and analysis of metallographic sections Determination of the actual stress state of the failed component Determination...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270087
EISBN: 978-1-62708-301-0
... . The fracture initiated from the trailing edge side. Fig. CH11.1 Schematic diagram showing location of fracture The fracture surface showed clear beach marks, with varying degrees of oxidation, indicating delayed type of failure. The beach marks covered an area of about 40% of the total fracture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130351
EISBN: 978-1-62708-284-6
... the topographic features of the fracture origins. The fracture topography was intergranular, which is indicative of a delayed mode of failure. Fig. 26 Typical fracture features. (a) Overall view (500 μm). (b) Intergranular fracture apparent at fracture origin (7 μm) The wall thickness at the origin...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270115
EISBN: 978-1-62708-301-0
.... Discussion The presence of two distinct regions on the fracture surface of the broken dovetail clearly indicates delayed failure. The discolored half-moon-shaped regions represent slow, progressive crack growth, while the brighter regions with chevron marks represent rapid fracture. Intergranular...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
... weldment. These include poor workmanship, a variety of hydrogen-assisted cracking failures, stress-corrosion cracking, fatigue, and solidification cracking in steel welds. Hydrogen-assisted cracking can appear in four common forms, namely underbead or delayed cracking, weld metal fisheyes, ferrite vein...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270168
EISBN: 978-1-62708-301-0
... ). There was no evidence of delayed failure. The fracture surfaces were well preserved and showed no rubbing, indicating there was no relative motion between the mating fracture surfaces after failure. The teeth on the splined coupling were flattened and chipped and the splined teeth showed distortion. The seal carrier...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390007
EISBN: 978-1-62708-459-8
... and delays fracture in extrusion, whereas die friction combines with inhomogeneity to increase tensile stresses and also the danger of fracture in wire-drawing ( Fig. 2.5c ). The important point is that the effects of friction cannot be artificially divorced from the effects of inhomogeneous deformation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smff.t53400203
EISBN: 978-1-62708-316-4
... Abstract This chapter describes the various types of cushion systems used in forming presses and their effect on part quality. It begins with a review of the deep drawing process, explaining that wrinkling, tearing, and fracture are the result of excess or insufficient material flow, which can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2017
DOI: 10.31399/asm.tb.sccmpe2.t55090317
EISBN: 978-1-62708-266-2
... with transgranular cleavage ( Ref 12.33 ). In U-0.75Ti, fracture occurs primarily along the martensite plate boundaries ( Ref 12.35 ), which are the counterparts of the α grain boundaries in unalloyed uranium. Similar instances of low-ductility intergranular tensile fracture and delayed cracking have been observed...