A model for the wing crack initiation and propagation of the inclined crack under uniaxial compression

Liu, Hongyan; Lv, Shuran

doi:10.1016/j.ijrmms.2019.104121

Cited by 31 publications

(15 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cheng et al 18 investigated the mechanics, damage patterns and infrared radiation characteristics of sandstones with prefabricated fractures at different dips. Liu et al 19 proposed a new model for calculating the expansion path of winged cracks in rock containing cracks under compressive shear stress, and it is in agreement with the experimental results. Niu et al 20 investigated the time-varying principal frequency distribution characteristics during the rupture of intact as well as defective red sandstone using acoustic emission techniques and obtained that microshear rupture was the main cause of the final damage of the specimen.…”

Section: Introductionsupporting

confidence: 54%

Infrared Radiation Characterization of Damaged Coal Rupture Based on Stress Distribution and Energy

Hao

Tang

et al. 2022

ACS Omega

View full text Add to dashboard Cite

As coal mine production enters the deep mining stage, the impact of coal and rock dynamic hazards is becoming more and more significant. And the coal and rock containing initial damage such as fractures are more susceptible to destabilization damage by disturbance. So, this paper takes coal containing macro-crack with different inclination angles as the research object and uses the RMT-150B rock mechanics system to carry out uniaxial loading rupture tests on the specimens. On this basis, the changes in infrared radiation on the surface are observed using an infrared thermal imaging camera, and it is analyzed and studied according to the stress distribution and energy change of the specimens. The results show that the strain ratio at crack closure after bearing the coal gradually increases with the increase in the macro-crack inclination. When the inclination angle is 0° < α < 90°, there are obvious low-temperature bands on the upper and lower sides after macro-crack closure. The variance of the infrared thermal image of the specimen can reflect its infrared radiation information more effectively and has a good correspondence with the stress–strain curve. With the increase in the specimen macro-crack inclination angle, the linear change of VIRT is more obvious, the rate of change gradually increases, and the inclination angle is the maximum at 90°. The accumulated elastic strain energy U e is the main source of energy for the sudden change in infrared radiation generated during the bursting process that occurs when the specimen is damaged, and U e is linearly and positively correlated with the change in infrared radiation in front of the specimen peak. These will provide some experimental basis and theoretical guidance for the use of infrared radiation precursor characteristics to warn the damaged coal–rock dynamic disaster.

show abstract

Section: Introductionsupporting

confidence: 54%

Infrared Radiation Characterization of Damaged Coal Rupture Based on Stress Distribution and Energy

Hao

Tang

et al. 2022

ACS Omega

View full text Add to dashboard Cite

show abstract

“…29 K I < 0 will occur based on the classical fracture theory under compression, which is of no physical significance, and K I = 0 has been verified under compression. 18,23 Besides, three T-stress components (T x , T y , and T xy ) exists at crack tip simultaneously, 19,30 so that the stress field in the vicinity of crack tip under compression can be expressed as Equation (2), 23 which includes stress intensity factor and T-stress components. According to the transformation of polar coordinate system and Cartesian coordinate system, the expression of stress field at crack tip in polar coordinate system is shown in Equation (3).…”

Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

“…According to the transformation of polar coordinate system and Cartesian coordinate system, the expression of stress field at crack tip in polar coordinate system is shown in Equation (3). 19 Considering inclined crack with small initial gap for CCP specimen under compression, crack surface is subjected to compressive and shear stresses. In the vicinity of crack tip, stress intensity factor K II can be expressed as Equation ( 4) for CCP specimens under uniaxial compression.…”

Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

“…When the crack surface is under compression, T-stress at the crack tip should include three components, namely T x , T y , and T xy . 19 It is necessary to explore the influence of different T-stress components on the stress field ahead of crack tip by considering crack initiation angle under different T-stress components. Figure 5 describes the crack initiation angles calculated based on the MMTS criterion when considering three kinds of T-stress components ahead of crack tip for CCP specimens and CTS specimens under uniaxial compression: (1) Only T x is considered; (2) considering T x and T y ; (3) considering T x , T y , and T xy .…”

Section: Effect Of T-stress Components On Crack Initiation Angle By M...mentioning

confidence: 99%

“…Liu 18 presented a new MTS criterion for rock materials by considering T-stress and other influence factors, including rock properties, crack geometric parameters, strength parameters, and deformation parameters, to achieve the crack initiation angle for wing crack. What is more, Liu et al 19 adopted a modified MTS (MMTS) criterion considering three T-stress components (T x , T y , and T xy ) to determine the crack initiation angle and propagation path of wing crack under uniaxial compression. It is worth mentioning that mode I stress intensity factor is negative according to classical fracture theory subjected to compressive loading.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Jin

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Considering T-stress components under compression, the crack initiation characteristics of HT200 and PMMA under uniaxial compression have been investigated by theoretical analysis and experimental study for central cracked plate (CCP) and compact tension shear (CTS) specimens with I-II mixed mode crack. Crack initiation angles of CCP and CTS specimens under compressive load were theoretical predicted according to modified maximum tangential stress (MMTS) criterion and modified maximum shear stress (MMSS) criterion. The influence of material parameters and specimen geometrical configurations on crack initiation characteristics was illustrated through experiments. It demonstrates that the modified fracture criterion considering T-stress components is more consistent with experiments. Crack initiation angle is related to material properties. Limit load P L is controlled by K II under compression for CCP specimen, and P L of PMMA is less than that of HT200. The closure effect on CTS specimens is less significant than that on CCP specimens.

show abstract

Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

Xu,

Dou,

Zhao

et al. 2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Flaw length has a significant effect on the cracking behaviour of fractured rock. PFC2D was used to simulate the uniaxial compression of red sandstone samples with secondary flaw lengths L2 of 0 mm, 5 mm, 10 mm, 15 and 20 mm under different primary flaw angles α(α = 0°, 15°, 30°, 45°, 60°, 75°, and 90°). Based on the simulation results, the effects of the secondary flaw length on the mechanical parameters, crack initiation location and crack evolution process of the fractured rock were analysed. Then, a method for judging the initiation location of the first cracks was proposed. Finally, the characteristics of the particle displacement field at preexisting flaw tips during first and secondary crack initiation were analysed. The results of this study are helpful for more deeply understanding the cracking behaviour of fractured rock.

show abstract

A model for the wing crack initiation and propagation of the inclined crack under uniaxial compression

Cited by 31 publications

References 47 publications

Infrared Radiation Characterization of Damaged Coal Rupture Based on Stress Distribution and Energy

Infrared Radiation Characterization of Damaged Coal Rupture Based on Stress Distribution and Energy

Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

Contact Info

Product

Resources

About