Crack branching in Homalite-100 sheets

Kobayashi, A. S.; Wade, Bonnie; Bradley, W.B.; Chiu, S. T.

doi:10.1016/0013-7944(74)90048-4

Cited by 76 publications

(30 citation statements)

References 9 publications

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“…As an instability phenomenon, the branching event of a running crack happens most frequently in essentially brittle fractures and high crack-propagation speeds and has been correlated with fracture surface topography and surface roughness in several investigations [1][2][3][4]. The author of [5] tried to analyze the crack branching event and correlate it with the increase of fracture toughness of brittle materials based on fractal geometry, using the fractal model as shown in Fig.…”

Section: Weisheng Lei and Bingsen Chen Welding Division Department Omentioning

confidence: 99%

Discussion on "the fractal effect of irregularity of crack branching on the fracture toughness of brittle materials" by Xie Heping

Lei

Chen

1994

Int J Fract

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As an instability phenomenon, the branching event of a running crack happens most frequently in essentially brittle fractures and high crack-propagation speeds and has been correlated with fracture surface topography and surface roughness in several investigations [1][2][3][4]. The author of [5] tried to analyze the crack branching event and correlate it with the increase of fracture toughness of brittle materials based on fractal geometry, using the fractal model as shown in Fig. 1. The present paper points out some essential defects of [5].For a co-planar fractal curve, from Richardson's relation, L/Lo = (b/Lo)l -o.(1)One can easily reach the expression of fractal dimension aswhere b is the yardstick, L 0 and L are the initiator and the total length of a fractal curve, respectively; all of which are with the Euclidean measure; D is the fractal dimension.Neglecting the specific physical background of "crack branching", the fractal dimension D in Fig. lb varies with the initiator L 0 as shown in Fig. 2: D = log(3)/lo~2 cos(-~)]

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Section: Weisheng Lei and Bingsen Chen Welding Division Department Omentioning

confidence: 99%

Discussion on "the fractal effect of irregularity of crack branching on the fracture toughness of brittle materials" by Xie Heping

Lei

Chen

1994

Int J Fract

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“…Crack branching in brittle materials has been a subject of theoretical [1][2][3][4] and experimental [5][6][7][8][9][10][11][12][13][14][15][16][17][18] studies. In particular, a criterion which controls the initiation of crack branching has drawn the attention of many researchers.…”

Section: Introductionmentioning

confidence: 99%

Branching of a fast crack in polymers

Arakawa

Toko

1991

Int J Fract

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Crack branching in Araldite D and Homalite-911 was studied using a modified Cranz-Schardin type high speed camera which provided simultaneously taken shadow patterns and specimen-focussed images. Fracture parameters including crack velocity ~i, stress intensity factor Kd and specific crack extension resistance R* were measured in the course of crack propagation. No definite critical values could be determined with one of those fracture parameters for the onset of crack branching. Instead, the product R*/t, i.e., energy per unit crack width per unit time, was found to have a critical value for the branching.

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“…Thus a pure Mode II dynamic isochromatic may be a mute academic study. Pure Mode II isochromatics of a stationary crack were reported in Reference [21].…”

Section: Theoretical Isochromaticsmentioning

confidence: 98%

Dynamic stress-intensity factors for unsymmetric dynamic isochromatics

Kobayashi

1981

Experimental Mechanics

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The mixed mode, near-field state of stresses surrounding a crack propagating at constant velocity is used to derive a relation between the dynamic stress intensity factors K i , KII, the remote stress component oox and the dynamic isochromatics. This relation together with an overdeterministic least-square method form the basis of a data reduction procedure for extracting dynamic K i , KII and ox from the recorded dynamic photoelastic pattern surrounding a running crack. The overdeterministic least-square method is also used to fit static isochromatics to the numerically generated dynamic isochromatics. The resultant static K I , KII, and aox are compared with the corresponding dynamic values and estimates of errors involved in using static analysis to process dynamic isochromatic data are obtained. The data reduction procedure is then used to evaluate the branching stress intensity factor associated with crack branching and the mixed mode stress intensity factors associated with crack curving.

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Crack branching in Homalite-100 sheets

Cited by 76 publications

References 9 publications

Discussion on "the fractal effect of irregularity of crack branching on the fracture toughness of brittle materials" by Xie Heping

Discussion on "the fractal effect of irregularity of crack branching on the fracture toughness of brittle materials" by Xie Heping

Branching of a fast crack in polymers

Dynamic stress-intensity factors for unsymmetric dynamic isochromatics

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