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Toko, Kiyoshi; Kido, Mamoru; Arakawa, Kazuo

doi:10.1023/a:1007443419107

Cited by 21 publications

(4 citation statements)

References 13 publications

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“…9 and 10). Similar results were also obtained by the authors for epoxy and Homalite-100 specimens [8][9][10][11][12][13][14].…”

Section: Relationships Between K Id and Crack Velocitysupporting

confidence: 88%

“…Dynamic crack propagation in brittle materials has been investigated using many experimental techniques. Optical methods such as photoelasticity [1][2][3][4] and the method of caustics [5][6][7][8][9][10][11][12][13][14] have been widely employed for evaluating the state of dynamic stress field around a propagating crack tip, i.e. dynamic stress intensity factor K ID .…”

Section: Introductionmentioning

confidence: 99%

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Specimen Geometry Effects on Dynamic Crack Propagation

Arakawa

Mada

2006

KEM

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Dynamic crack propagation in PMMA was studied using the method of caustics in combination with a Cranz-Schardin type high-speed camera. Three different types of specimen geometries were employed to achieve the crack acceleration, deceleration and re-acceleration process in one fracture event. Dynamic stress intensity factor KID and the crack velocity were evaluated in the course of crack propagation to obtain the relationship between KID and the velocity The effect of crack acceleration and deceleration on the KID -velocity relations was examined.

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“…9 and 10). Similar results were also obtained by the authors for epoxy and Homalite-100 specimens [8][9][10][11][12][13][14].…”

Section: Relationships Between K Id and Crack Velocitysupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Specimen Geometry Effects on Dynamic Crack Propagation

Arakawa

Mada

2006

KEM

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“…A fracture surface forms when the rock fails under dynamic direct tension. The geometry of the fracture surface reflects the fracture process and is significant to the deduction of the stress environment at the fracture surface in the fracture process [28]. Previous studies on the roughness of a discontinuity focused on the shear-resisting characteristics of the rock mass.…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effect on the Mechanical Properties and Fracture Surface Roughness of Sandstone Subjected to Dynamic Direct Tension

et al. 2020

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Dynamic properties of rocks are extremely important in a variety of rock mechanics and rock engineering problems. The split Hopkinson tensile bar (SHTB) system is used in this paper to measure the mechanical properties of sandstone specimens under dynamic direct tension, and the full stress-strain curves of the specimens at different strain rates is obtained. The experimental results indicate that the tensile strength, the tensile modulus and the peak strain of the specimen increase almost linearly with the strain rate. The increases in the tensile strength, the tensile modulus and the peak strain reach 125 %, 37 % and 98 % respectively as the strain rate increases by 252 %. The microscopic structure characteristics of the fracture surfaces after the tensile failure of the specimens are investigated by three-dimensional scanning. The results suggest that the fracture surface roughness of the sandstone under direct tension is significantly sensitive to the strain rate. Both the roughness coefficient and the fractal dimension of the specimen increase with the strain rate. The fracture surface of the specimen changes from a relatively flat two-dimensional state to a three-dimensional state, and its relative area gradually increases. Finally, it is manifested from the aspect of energy consumption that both the energy consumed in the fracture process and the dynamic direct tensile strength enhance with the fracture surface roughness. It is believed that the investigation results can provide an important reference for the research on dynamic properties of rocks involved in experimental research and engineering practice.

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“…The striking observation is that materials with very different properties and breakdown mechanisms have the same roughness-scaling law and very close ͑if not equal͒ values of roughness-scaling exponent. Understanding this universality is a fundamental challenge which has already led to much experimental [3][4][5][6] and theoretical 2,7-10 research. However, disorder is only one of many important factors in fracture, which is a very complex process that almost always combines many aspects of different nature.…”

Section: Introductionmentioning

confidence: 99%