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void coalescence

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610055
EISBN: 978-1-62708-303-4
... Abstract This chapter discusses the causes and effects of ductile and brittle fracture and their key differences. It describes the characteristics of ductile fracture, explaining how microvoids develop and coalesce into larger cavities that are rapidly pulled apart, leaving bowl-shaped voids or...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2011
DOI: 10.31399/asm.tb.jub.t53290137
EISBN: 978-1-62708-306-5
... primary importance during this stage. At the completion of this stage, the interface boundary is no longer a planar interface but consists of voids separated by areas of intimate contact. In these areas of contact, the joint becomes equivalent to a grain boundary between the grains on each surface. The...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130043
EISBN: 978-1-62708-284-6
... void. This void grows by plastic strain and hydrostatic stress. Finally, the voids grow to a size that they join or coalescence with adjacent voids. Fig. 8 Fracture of an ISO 12.9 bolt by ductile torsional overload. (a) Overall view of fracture. (b) Smooth and fibrous fracture as seen...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540047
EISBN: 978-1-62708-309-6
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780204
EISBN: 978-1-62708-281-5
... The brittle fracture of glassy thermoplastics has been the subject of many studies. Several workers have investigated the growth of crazes to gain an insight into the mechanism of crack nucleation and growth. Evidence of void coalescence caused by fibril failure in PS is reported in Ref 12 . Newton’s...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630101
EISBN: 978-1-62708-270-9
... microvoids coalesce rapidly, and the process continues until fracture occurs. For this reason, the term frequently used for this process of formation of tiny voids and their growing together is called microvoid coalescence . The process of microvoid coalescence continues to form larger cracks, which...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310027
EISBN: 978-1-62708-286-0
... has been debate about HE that has produced more heat than light. This involved distinguishing among the same mechanisms, namely: Decohesion Enhanced local plasticity Adsorption embrittlement Void coalescence The identification of the operative mechanism for HE involves again...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... resistance from a microstructure of 100% tempered martensite, which was not found in this case. Scanning electron microscopy after metallography showed the presence of coalesced creep voids ( Fig. 6.38 ). Fig. 6.37 Core microstructure of a tube showing ferrite and tempered martensite, (a) 400×, (b...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240265
EISBN: 978-1-62708-251-8
... with rupture failures. Since it is not really a creep-dominated failure mode, it will not be considered further in this section. Transgranular fractures can occur during creep when the stress levels and strain levels are fairly high. Voids nucleate, usually around inclusions, and then grow and coalesce...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030082
EISBN: 978-1-62708-282-2
... remaining element(s). For example, in the silver-gold system, silver can be almost 100% removed in various acid electrolytes, leaving behind porous gold, as shown in Fig. 1 . This bicontinuous metal-void structure is highly brittle in nature and has been linked to stress-corrosion cracking in many alloy...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630063
EISBN: 978-1-62708-270-9
... continued until fracture occurs, the shear deformation causes tiny microvoids to form in the most highly stressed region; these tiny voids soon coalesce, or interconnect, and form fracture surfaces that have many half-voids, or dimples, on each side of the fracture face. This is the “dimpled rupture...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130503
EISBN: 978-1-62708-284-6
... Al … 0.038 Nb … 0.02 Table 2 Hydrogen trap interactions in steel Hydrogen trap type Binding energy ( E d ), kJ/mol Interstitial solutes 3–15 Ti atom 26 Vacancy 46 Screw dislocation core 20–30 Mixed dislocation core 59 Hydrogen vapor/void 29 Grain...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780404
EISBN: 978-1-62708-281-5
... debonding at inclusions before necking), and fracture typically occurs soon thereafter. In contrast, cavitation processes in polymers can dominate the plastic deformation. These voids do not coalesce into a crack but instead become stabilized by fibrils containing oriented polymeric material. The resulting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780305
EISBN: 978-1-62708-281-5
... manifest as linear regions of local plastic deformation forming perpendicular to the applied stress. The craze itself is a highly voided, spongy structure of material oriented across its width. For a craze to form from a previously undisturbed glassy matrix, considerable molecular mobility must somehow...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030148
EISBN: 978-1-62708-282-2
.... Blistering due to hydrogen is frequently associated with grain-boundary precipitates or the formation of small voids. Blister formation in aluminum is different from that in ferrous alloys in that it is more common to form a multitude of near-surface voids that coalesce to produce a large blister. In a...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 2008
DOI: 10.31399/asm.tb.emea.t52240221
EISBN: 978-1-62708-251-8
..., followed by void formation and growth around the particles, or by particle cracking ( Fig. 13.4 ). The microvoids then coalesce and grow to produce larger voids until the remaining area becomes too small to support the load, and final failure occurs. The ligaments between the voids fail in shear on the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610549
EISBN: 978-1-62708-303-4
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.smnm.t52140039
EISBN: 978-1-62708-264-8
.... As the flow continues, these voids grow and coalesce until breakage occurs. The SEM micrographs at fairly high magnifications, such as that shown in Fig. 5.12 , show remnants of the individual voids exposed on the fracture surface. The fracture is often called microvoid coalescence , for obvious...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610415
EISBN: 978-1-62708-303-4
... applied stresses (high strain rates), fail by a void-forming process similar to that of microvoid coalescence in dimple rupture. Fractographs of some stress-rupture fractures exhibit both transgranular and intergranular fracture paths. In such instances, it is usually found that the transgranular...