Plane strain fracture toughness of high strength materials

Steigerwald, E. A.

doi:10.1016/0013-7944(69)90006-x

Cited by 12 publications

(4 citation statements)

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“…Steigerwald (27) observed that the plane strain fracture toughness continued to decrea.se relatively sharply as the testing temperature was lowered from room Recent work by Capus and Mayer (32) has shown that the presence of certain impurity el~ents has a significant influence on tempered martensite…”

Section: "'mentioning

confidence: 99%

Untempered Ultra-high Strength Steels of High Fracture Toughness

Zackay

Parker

Goolsby

et al. 1972

Nature Physical Science

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Section: "'mentioning

confidence: 99%

Untempered Ultra-high Strength Steels of High Fracture Toughness

Zackay

Parker

Goolsby

et al. 1972

Nature Physical Science

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“…One popular explanation of the apparently low fracture toughness of thin FCC metal specimens is that the increased yield strength observed in nanopillars in compression and nanopillars and films in tension causes the low fracture toughness of thin specimens just like the strength/fracture toughness trade‐off seen in larger‐scale specimens . However, upon closer inspection, it becomes apparent that size‐induced strengthening is a phenomenon observed primarily in sub‐micron specimens while decreasing fracture toughness with specimen size can be observed at much larger length scales . Consequently, the low fracture toughnesses measured in thin ductile metal sheets must be a consequence of an inappropriate analysis for the thin sheets and/or thickness limiting the strength of the sheets by means other than the strength/fracture toughness trade‐off observed in the bulk …”

Section: Introductionmentioning

confidence: 99%

“…Schematic of the dependence of fracture toughness of metals on specimen thickness B adapted from the study of Steigerwald and Hanna . Specimens thick enough to be predominantly in plane strain ( B > B 0 ) have a constant fracture toughness .…”

Section: Introductionmentioning

confidence: 99%

“…Unlike specimen size‐dependent strength, size‐dependent fracture toughness in thin FCC metal specimens is not a phenomenon particular to the nanoscale . The length scale regime of specimen size‐induced strengthening is limited to very small specimens (a few μm or thinner), but the fracture toughness of FCC metals has been shown to begin decreasing below a critical thickness B * as large as a few millimetres . For example, Kang et al .…”

Section: Introductionmentioning

confidence: 99%

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Reconciling fracture toughness parameter contradictions in thin ductile metal sheets

Lanning

Javaid

Muhlstein

2017

Fatigue Fract Eng Mat Struct

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A B S T R A C T The well-known trade-off between strength and fracture toughness in bulk specimens is often used to explain the low fracture toughness of very thin ductile face-centred cubic metal specimens, but this interpretation contradicts the relative length scales of thickness-dependent strength and thickness-dependent fracture toughness. This study uses the concept of similitude to demonstrate that linear elastic fracture mechanics analysis of 25.4 μm thick annealed aluminium is invalid, although the resulting fracture toughness measurements fit well with the existing literature and idea of a strength/fracture toughness trade-off. Similarly, an elastic plastic fracture mechanics analysis is sensitive to out-of-plane deformation that cannot be practically eliminated or corrected for with a model. However, a plastic collapse analysis using a critical net section stress criterion is demonstrably valid by the concept of similitude, is insensitive to out of plane deformation, and agrees with the evidence of extensive plasticity in the fracture surfaces.Keywords ductile tearing; fracture mechanics; fracture toughness; plastic collapse; stable crack growth; thin sheet. N O M E N C L A T U R Ea = crack length in SE(T) specimen or half crack length in M(T) specimen Atot = total work applied to specimen A tot ¼ ∫ Δ 0 Pd Δ b = uncracked ligament length B, B 0 , B * = thickness, minimum thickness for plane strain, critical thickness J, J max = J-integral, maximum valid J measurement for a given specimen goemetry K = stress intensity factor K Ic , K R = fracture toughness in mode I loading, propagation toughness in K-R analysis L À = mean lineal intercept grain size LEFM, EPFM = linear elastic fracture mechanics, elastic-plastic fracture mechanics M(T) = middle crack tension specimen geometry P = force applied to specimen R = load ratio σ min /σ max used in fatigue precracking SE(T) = single edge crack tension specimen geometry t = traction acting normal to J-integral path Γ u = displacement vector at a point along path Γ w = width of SE(T) or half width of M(T) specimens W = strain energy density x, y = in-sheet coordinate axes perpendicular and parallel to tensile stress, respectively Y = geometric correction factor used in computation of K ¼ σ Y ffiffiffiffiffiffi π a p Correspondence: C. L. Muhlstein.

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Die Rißzähigkeit von Vergütungsstählen

Hellwig

1974

Materialwissenschaft Werkst

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Plane strain fracture toughness of high strength materials

Cited by 12 publications

References 3 publications

Untempered Ultra-high Strength Steels of High Fracture Toughness

Untempered Ultra-high Strength Steels of High Fracture Toughness

Reconciling fracture toughness parameter contradictions in thin ductile metal sheets

Die Rißzähigkeit von Vergütungsstählen

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