Dynamic crack curving—A photoelastic evaluation

Ramulu, M.; Kobayashi, A. S.

doi:10.1007/bf02328674

Cited by 70 publications

(38 citation statements)

References 27 publications

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“…The authors have used in the past, both the maximum circumferential stress -riterion [3] and the minimum strain energy density criterion (14] …”

Section: Dynamic Crack Curving Criterionmentioning

confidence: 99%

“…Dynamic crack curving and branching represent one aspect of dynamic crack propagation behaviors which has been the subject of numerous theoretical [1][2][3][4][5] and experimental 16-9J investigations. The biaxial load effects on static and quasistatic fracture have also been the subject of theoretical and experimental studies 10-12J.…”

Section: Introductionmentioning

confidence: 99%

“…The crack curving criteria [3] referred to in this paper is a micro-mechanic model of continuous micro-flaw growth and coalescence in the vicinity of the propagating crack tip. A similar model based on qualitative evidences has also been proposed [13].…”

Section: Introductionmentioning

confidence: 99%

“…It is the dynamic extension of the crack curving criterion proposed by Streit and Finnie (5]. This dynamic crack curving criterion has been used to predict the crack kinking angle of a propagating crack under pure mode I as well as mixed mode conditions [3]. The crack branching criterion (4] on the other hand, requires a critical stress intensity factor to trigger crack branching and a crack curving criterion for predicting the crack branching angle.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic crack curving and branching under biaxial loading

Hawong

Kobayashi

Dadkhah

et al. 1987

Experimental Mechanics

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A 16 spark-gap camera was used to record the dynamic photoelastic patterns of ten centrally cracked, Homalite-100 specimens which fractured under ten biaxial stress ratios ranging from 3.7 to 0.The dynamic photoelastic patterns of curved cracks were used to verify the previously developed dynamic crack curving criterion. Cracks, which immediately curved upon propagation in three specimens under high biaxial loadings, were used to verify the static counterpart of the dynamic crack curving criterion. A previously developed dynamic crack branching criterion was verified by the dynamic photoelastic results involving cracks which eventually branched under low biaxial loadings.,

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“…The authors have used in the past, both the maximum circumferential stress -riterion [3] and the minimum strain energy density criterion (14] …”

Section: Dynamic Crack Curving Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dynamic crack curving and branching under biaxial loading

Hawong

Kobayashi

Dadkhah

et al. 1987

Experimental Mechanics

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“…There are conditions, however, when the crack will deviate from its self-similar crack extension path to curve [1] or to bifurcate [2] under specific static or dynamic loadings. Such crack extension away from the line of symmetry in a finite element mesh cannot be accomplished by the abovementioned simple nodal release mechanism.…”

Section: Introductionmentioning

confidence: 99%

Double noding technique for mixed mode crack propagation studies

Liaw

Kobayashi

Emery

1984

Numerical Meth Engineering

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A simple dynamic finite element algorithm for analysing a propagating mixed mode crack tip is presented. A double noding technique, which can be easily incorporated into existing dynamic finite element codes, is used together with a corrected Ĵ integral to extract modes I and II dynamic stress intensity factors of a propagating crack. The utility of the procedure is demonstrated by analysing test problems involving a mode I central crack propagating in a plate subjected to uniaxial tension, a stationary slanted central crack in a plate subjected to uniaxial inpact loading and an extending slanted‐edge crack in plate subjected to uniaxial tension.

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Study of rubber‐modified brittle epoxy systems. Part II: Toughening mechanisms under mode‐I fracture

Sue

1991

Polymer Engineering & Sci

105

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The toughening mechanisms in grafted‐rubber concentrate (GRC), dispersed acrylic rubber (DAR), and Proteus rubber‐modified brittle epoxy (i.e., highly crosslinked) systems are examined using scanning electron microscopy, optical microscopy and transmission electron microscopy techniques. The toughening of the GRC‐modified brittle epoxy system is found to be due to cavitation of the GRC rubber particles, followed by formation of limited shear yielding when the crack propagates. Crack bifurcation and crack deflection are also observed in this system. Only crack bifurcation, crack deflection, and possibly crack/particle bridging mechanisms are operative in the DAR‐modified brittle epoxy system. In the case of the Proteus rubber‐modified system, the rubber appears to be rigid (Tg ≈ 28°C). As a result, the crack/particle bridging mechanism is not observed. Only crack deflection and crack pinning mechanisms are found. These observations are in agreement with the toughness measurement results (see Part I), which indicate that the GRC rubber provides the most effective toughening, followed by the DAR rubber, and then by the Proteus rubber. An approach for toughening brittle epoxies is also discussed.

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Dynamic crack curving—A photoelastic evaluation

Cited by 70 publications

References 27 publications

Dynamic crack curving and branching under biaxial loading

Dynamic crack curving and branching under biaxial loading

Double noding technique for mixed mode crack propagation studies

Study of rubber‐modified brittle epoxy systems. Part II: Toughening mechanisms under mode‐I fracture

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