Measurement of mode I and mode II rock dynamic fracture toughness with cracked straight through flattened Brazilian disc impacted by split Hopkinson pressure bar

Wang, Q.Z.; Feng, Fei; Min, Na; Gou, Xunjie

doi:10.1016/j.engfracmech.2011.06.004

Cited by 111 publications

(36 citation statements)

References 17 publications

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“…Several teams have modified the split-Hopkinson pressure bar to measure fracture parameters on Brazilian disc specimens [21][22][23][24]. These researchers have used strain gages on the incident and transmission bars to determine the peak load, fracture gages on the specimen to monitor fracture, and laser gap gages to measure crack opening displacement.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement

Bedsole¹,

Tippur

2013

Journal of Engineering Materials and Technology

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A long-bar apparatus for subjecting relatively small samples to stress-wave loading has been devised for failure characterization. A methodology based on digital image correlation (DIC) used in conjunction with ultra high-speed photography and a long-bar impactor has been developed for determining dynamic crack initiation stress intensity factor (SIF) {Kf_.^.), as well as SIFsfor a rapidly growing crack (Kf) during high-strain rate events. By altering the material of the pulse shaper, a range of strain rates has been attained. Commercial grade PMMA was first used to calibrate the device, and then dynamic fracture characterization was performed for the first time on PMMA-based bone cement (BC). Despite several key differences, the two materials performed similarly during quasi-static fracture tests; however, under dynamic loading conditions, bone cement exhibited significantly lower crack initiation SIF (Kf..), lower dynamic SIFs (Kf), and higher crack tip velocities for three different dynamic loading rates {K = 6.5-24 X W*MPay^s^').

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Section: Introductionmentioning

confidence: 99%

Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement

Bedsole¹,

Tippur

2013

Journal of Engineering Materials and Technology

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“…Erarslan and Williams (2012) explored the relation between the fatigue failure mechanism and the fracture toughness of rocks. Wang et al (2011) studied the fracture toughnesses of type I and II rocks under dynamic conditions. Rocks exist in a complicated natural environment and are often subjected to varying influences.…”

Section: Introductionmentioning

confidence: 99%

Fracturing and Damage to Sandstone Under Coupling Effects of Chemical Corrosion and Freeze–Thaw Cycles

2016

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Rapid freeze-thaw (FT) cycles were adopted to explore the damage deterioration mechanism and mechanical properties of sandstone specimens under the coupling effects of different chemical solutions and FT cycles. The variation regularities of the FT cycles and physical and mechanical properties of sandstone specimens immersed in different chemical solutions were analyzed by using sandstone sampled from a Chinese riverbank slope. The damage variable based on porosity variation was used in the quantitative analysis of the damage to the sandstone under the coupling effects of chemical corrosion and FT cycles. Experimental results showed that the sandstone specimens weakened substantially under those effects. Their fracture toughness K IC , splitting tensile strength, and compressive strength showed a similar deteriorating trend with various numbers of FT cycles. However, a difference exists in the deterioration degree of their mechanical parameters, i.e., the deterioration degree of their fracture toughness K IC is the greatest followed by that of splitting tensile strength, and that of compressive strength is relatively small. Strong acid solutions may aggravate the deterioration of FT damage in sandstones, but at the early stage of the experiment, strong alkaline solutions inhibited sandstone damage deterioration. However, the inhibiting effect disappeared when the number of FT cycles exceeded 25. The different chemical solutions had a different effect on the FT damage degree of the sandstone specimens; for example, SO 4 2-ions had a greater effect on FT damage than did HCO 3 -ions. Water-chemical solutions and FT cycles promote each other in deteriorating rocks and simultaneously affect the damage deterioration degree of sandstones.

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“…The study on crack dynamic propagations of rock has been performed by several researchers, and a large progress has been achieved by using SHPB test systems . Meanwhile, several new methods have been developed, such as experimental‐numerical method and the high‐speed photography method . However, the main focus of the former studies was on crack initiation processes under dynamic loads, and lesser attention has been paid to the process of crack propagations and arrests.…”

Section: Introductionmentioning

confidence: 99%

Study of mode I crack dynamic propagation behaviour and rock dynamic fracture toughness by using SCT specimens

Dong

Zhu

Zhou

et al. 2018

Fatigue Fract Eng Mat Struct

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To study crack dynamic propagation behaviour and rock dynamic fracture toughness, a single cleavage triangle (SCT) specimen was proposed in this paper. By using these specimens and a drop‐weight test system, impact experiments were conducted, and the crack propagation velocity and the fracture time were measured by using crack propagation gauges. To examine the effectiveness of the SCT specimen and to predict the test results, finite difference numerical models were established by using AUTODYN code, and the simulation results showed that the crack propagation path agrees with the test results, and crack arrest phenomena could happen. Meanwhile, by using these numerical models, the crack dynamic propagation mechanism was investigated. Finite element code ABAQUS was applied in the calculation of crack dynamic stress intensity factors (SIFs) based on specimen dimension and the loading curves measured, and the curves of crack dynamic SIFs versus time were obtained. The fracture toughness (including initiation toughness and propagation toughness) was determined according to the fracture time and crack speeds measured by crack propagation gauges. The results show that the SCT specimen is applicable to the study of crack dynamic propagation behaviour and fracture toughness, and in the process of crack propagation, the propagation toughness decreases with crack propagation velocity, and the crack arrest phenomena could happen. The critical SIF of an arrest crack (or arrest toughness) was higher than the crack propagation toughness but was lower than the initiation toughness.

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Measurement of mode I and mode II rock dynamic fracture toughness with cracked straight through flattened Brazilian disc impacted by split Hopkinson pressure bar

Cited by 111 publications

References 17 publications

Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement

Dynamic Fracture Characterization of Small Specimens: A Study of Loading Rate Effects on Acrylic and Acrylic Bone Cement

Fracturing and Damage to Sandstone Under Coupling Effects of Chemical Corrosion and Freeze–Thaw Cycles

Study of mode I crack dynamic propagation behaviour and rock dynamic fracture toughness by using SCT specimens

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