Sequential determination of dynamic initiation and propagation toughness of rock using an experimental–numerical–analytical method

Wang, Q.Z.; Yang, Jieren; Zhang, Chenggang; Zhou, Yulong; Li, L.; Zhu, Zhixue; Wu, L. Z.

doi:10.1016/j.engfracmech.2015.04.025

Cited by 49 publications

(13 citation statements)

References 21 publications

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“…In the test, the position and timing of the crack was determined according to the mutation position and the time of the voltage signals of the CPG. The CPG device provides advantages in that it has a simple design, high sensitivity, etc., for example, [5,12]. The parameters for the SHPB and CPG monitoring devices are shown in tab.…”

Section: S899mentioning

confidence: 99%

“…Material parameter values of the SHPB Parameters for the CPG monitoring devices [12] The crack tips of the P-CCNBD specimen constituted 3-D configurations, as shown in fig. 1.…”

Section: Table 2 Parameters For the Shpb And Cpg Monitoring Devicesmentioning

confidence: 99%

“…Clearly, the basic assumption of testing rock dynamic fracture toughness by the quasi-static method is not satisfied. Therefore, an experimental-numerical method is proposed to determine the dynamic fracture toughness of rock in the article, see [12], which does not need to satisfy the conditions of quasi-static stress equilibrium necessarily.…”

Section: Asymmetric Fracture Process Of the P-ccnbd Specimenmentioning

confidence: 99%

“…Table 4 shows that in the P-CCNBD dynamic test, the loading rate increases from 4.426 ⋅ 10 4 MPa m 1/2 s -1 to 7.172 ⋅ 10 4 MPa m 1/2 s -1 , and the corresponding dynamic fracture toughness of 4.68 MPa m 1/2 increases to 6.96 MPa m 1/2 . The results are compared with the research results of scholars working in the same area, Zhang et al [21], Yang et al [13], Wang et al [12], and Zhang and Zhao [5]. To eliminate the influence of the material properties of the rock, the experimental results are treated dimensionlessly using eq.…”

Section: Influence Of Loading Rate On Dynamic Fracture Toughnessmentioning

confidence: 99%

“…Therefore, it is necessary to study the dynamic fracture failure law of large specimens to understand the large-scale dynamic fracture process in rock engineering. Wang et al [12] and Yang et al [13] found that a stress balance could not be achieved in large specimens under a dynamic impact load. However, the asymmetric fracture behavior in specimens caused by stress imbalance was not analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

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The dynamic asymmetric fracture test and determination of the dynamic fracture toughness of large-diameter cracked rock specimens

Gao

et al. 2019

THERM SCI

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We propose large-diameter (160 mm) pre-cracked chevron notched Brazilian disc (P-CCNBD) specimens were used to study the asymmetric fracture law and determine the dynamic fracture toughness of rock. Specimens were diametrically impacted by a split Hopkinson pressure bar. The dynamic fracture failure process of each specimen was monitored by crack propagation gauges and strain gauges. Each of the large-diameter P-CCNBD specimens was found to exhibit prominent asymmetric fracture under impact load. The stress equilibrium condition cannot be satisfied. The dynamic fracture toughness values of the rocks were measured using the experimental-numerical method rather than the quasi-static method. The calculation results showed that the dynamic fracture toughness of rocks increases with the dynamic loading rate. In addition, at the 3-D crack front, the dynamic stress intensity factor was found be substantially different at each point. These data suggest that the dynamic fracture toughness of P-CCNBD specimens should be calculated by removing the value affected by an edge arc crack and taking the average value of the remaining points.

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Section: S899mentioning

confidence: 99%

“…Material parameter values of the SHPB Parameters for the CPG monitoring devices [12] The crack tips of the P-CCNBD specimen constituted 3-D configurations, as shown in fig. 1.…”

Section: Table 2 Parameters For the Shpb And Cpg Monitoring Devicesmentioning

confidence: 99%

Section: Asymmetric Fracture Process Of the P-ccnbd Specimenmentioning

confidence: 99%