Relationship between diameter of split Hopkinson pressure bar and minimum loading rate under rock failure

Li, Xibing; Liang, Hong; Yin, Tubing; Zhou, Zilong; Ye, Zhouyuan

doi:10.1007/s11771-008-0042-7

Cited by 36 publications

(9 citation statements)

References 13 publications

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“…Transitions in dynamic failure mode in rock samples from discrete fracture to extensive fragmentation has also been previously investigated by Li et al [2005] and Zhou et al [2008] for rock mining applications, where they studied the relationship between specimen diameter and loading rate on the failure of unconfined rock samples. More importantly, they also showed that a critical strain rate was essential to induce fragmentation in rocks during the dynamic compressive loading below which the posttest specimens were essentially observed to be intact; moreover, they reported the critical strain rate levels to decrease as the specimen size became larger [ Li et al , 2008; Lok et al , 2002].…”

Section: Resultsmentioning

confidence: 99%

Origin of pulverized rocks during earthquake fault rupture

2011

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[1] The origin of pulverized rocks (PR) in surface outcrops adjacent to the fault cores of the San Andreas and other major faults in Southern California is not clear, but their structural context indicates that they are clearly associated with faulting. An understanding of their origin might allow inferences to be drawn about the nature of dynamic slip on faults, including rupture mechanisms and their speed during earthquakes. In the present study, we use split Hopkinson bar recovery experiments to investigate whether PR can be produced under dynamic stress wave loading conditions in the laboratory and whether PR is diagnostic of any particular process of formation. The results of the study indicate that in Westerly granite for transition from sparse fracture to pervasive pulverization requires high strain rates in excess of 250/s and that the formation of PR may be inhibited at the larger burial depths. The constraint imposed by field observations of the relatively low strains (1-3%) in PR recovered from the field and the laboratory derived threshold for the critical strain rate (∼250/s and higher) together indicate that a dynamic supershear-type rupture may be necessary for the origin of pulverized rocks at distances of tens of meters away from the fault plane as observed in the field for both large strike-slip-type and the relatively small dip-slip-type fault ruptures in nature.

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Section: Resultsmentioning

confidence: 99%

Origin of pulverized rocks during earthquake fault rupture

2011

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“…& P. Xin mechxinp@126.com Table 1 summarizes the uniaxial compressive strength (r uc ) of rock-like materials obtained in uniaxial compression tests and its corresponding strain rates. It can be clearly seen that most of studies are conducted on the quasi-static states, and there are limited experiments conducted to investigate the shape effects in quasi-dynamic or dynamic conditions (Bordia 1971;Green and Perkins 1968;Frew et al 2001;Li et al 2005Li et al , 2008. Moreover, the experimental data of the quasi-dynamic loading conditions are extremely scarce.…”

Section: Introductionmentioning

confidence: 99%

The effect of specimen shape and strain rate on uniaxial compressive behavior of rock material

Liang

Zhang

et al. 2015

Bull Eng Geol Environ

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The mechanical properties of rock material with length/diameter ratios varying from 1.0 to 3.0 were determined using a newly developed servo-hydraulic machine at a wide range of strain rates. The uniaxial compressive strength, initiation and dilatancy stresses, peak axial strain, and strain energy gradually decreased with increasing length/diameter ratios at the same loading condition; for the same length/diameter ratio, these properties increased with increasing strain rate. The elastic modulus increased with increasing specimen shape and strain rate, whereas the Poisson's ratio was independent on these two factors. The fracture modes were significantly dependent on both strain rate and specimen shape. When the strain rate was below 10 -3 s -1 , splitting was the main fracture mode for the short specimens while the shearing fracture mode dominates the longer specimens; when the strain rate was above 10 -3 s -1 , the fracture mode changed directly from cone-shaped fractures to shearing fractures. The recommended length/diameter ratio was 2.5 at strain rates of 10 -5 -10 -2 s -1 .

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“…The size of cylinder specimens was an important factor in SHPB test. Li et al [23] considered that the cylinder aspect ratio (H/D) was about 0.5 as the inertial and terminal effects were restrained greatly. Herein, the height and diameter were 37 mm and 74 mm.…”

Section: Experiments Frameworkmentioning

confidence: 99%

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

et al. 2019

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Concrete in practical applications has to inevitably suffer various impact loads. Recent research indicates that the hybrid fiber reinforced concrete (FRC) has better dynamic mechanical properties compared to the mono FRC under impact loading. Based on macro-experimentation and micro-observation, the impact behavior of the hybrid basalt-macro synthetic polypropylene FRC (BSFRC) was investigated by using ∅74 mm SHPB, SEM, and EDS. The effects of fiber hybridization, strain rate, and w/c ratio were analyzed simultaneously. The results show that the dynamic mechanical properties of BSFRC are strain-rate sensitive. Both basalt and macro synthetic polypropylene fibers (BF, SF) have a strengthening and toughening effect on concrete. Their hybridization has a similar enhancement effect but the impact toughness of concrete is further improved and the best hybrid ratio is 0.05%(BF)–0.25%(SF). BSFRC with higher w/c ratio has a higher strain rate effect while the fiber hybridization effect is weakened. Besides, the proposed constitutive model can well describe the impact behavior of BSFRC. The hydration of cement in the interface transition zones is lower with more Calcium Silicate Hydrate and less Ca ( OH ) 2 than that in the common mortar. However, the addition of BF and SF contributes to the hydration of cement and improves the performance of concrete eventually.

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Relationship between diameter of split Hopkinson pressure bar and minimum loading rate under rock failure

Cited by 36 publications

References 13 publications

Origin of pulverized rocks during earthquake fault rupture

Origin of pulverized rocks during earthquake fault rupture

The effect of specimen shape and strain rate on uniaxial compressive behavior of rock material

Effect of Fiber Hybridization, Strain Rate and w/c Ratio on the Impact Behavior of Hybrid FRC

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