Effect of Holes on Dynamic Crack Propagation under Impact Loading

Wang, Fei; Wang, Meng

doi:10.3390/app10031122

Cited by 5 publications

(4 citation statements)

References 27 publications

(32 reference statements)

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“…To reduce the random error induced by material heterogeneity, polymethyl methacrylate (PMMA) was used to make the specimens. PMMA is usually applied in investigating the dynamic fracture mechanism of brittle material, it shows similar fracture characteristics under impact loading to concrete and rock [34,35]. The measured material parameters of PMMA are shown in Table 1.…”

Section: Specimen and Experimental Systemmentioning

confidence: 99%

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

et al. 2020

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Mixed-mode fracture of construction building materials under impact loading is quite common in civil engineering. The investigation of mixed-mode crack propagation behavior is an essential work for fundamental research and engineering application. A variable angle single cleavage semi-circle (VASCSC) specimen was proposed with which the dynamic fracture test was conducted by using a Split-Hopkinson pressure bar (SHPB). Notably, the mixed-mode crack propagation velocity could be detected by the synchronized crack velocity measuring system. With experimental results, the dynamic initiation stress intensity factors KI and KII were calculated by the experimental-numerical method. Additionally, the crack path of mixed-mode I/II fracture can be predicated precisely by using numerical method. Thus, a comprehensive approach of investigation on mixed-mode I/II fracture under impact loading was illustrated in this paper. The study demonstrates that the mixed-mode I/II crack would transform from complicated mode I/II to pure mode I during crack propagation, and several velocity decelerations induced crack deflection. The dynamic initiation fracture toughness of mixed-mode crack was determined by the experimental-numerical method. The VASCSC specimen has a great potential in investigating mixed-mode fracture problems with the SHPB device.

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Section: Specimen and Experimental Systemmentioning

confidence: 99%

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

et al. 2020

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“…The dynamic initiation stress intensity factor was calculated using the experimental-numerical method, and the crack path was predicted numerically. In [10], the effect of holes on dynamic crack propagation under impact loading was investigated, which demonstrated that the suppressing effect on moving crack increased inversely proportional to the spacing of holes.…”

Section: Introductionmentioning

confidence: 99%

Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique

et al. 2021

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An experimental optical method has been developed for the measurement of opening and sliding notch face movements. The light passing through a thin slit is monitored by a photodiode detector. Two parts of the slit are fixed independently on the notch faces of the simulated crack. Dynamic variations of the notch face movements are recorded as an electric signal by an ‘oscilloscope. The sensitivity of such displacement measurement is comparable with the wavelength of light. Dynamic mixed-mode stress intensity factors under shock loading were evaluated from the data obtained and subsequently compared with a numerical simulation by ANSYS software. As it was approved, the technique has shown sufficient sensitivity, good linearity, and measurement reliability. Due to its non-destructive nature and overall robustness, the arrangement is applicable even for structural component condition determination taking into consideration potentially unknown boundary conditions and the non-linear character of mechanical parameters.

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“…Recently the fracture characteristics in a pre-existing crack rock under impact loads have been discussed in many research works [7][8][9][10][11][12][13][14][15][16][17]. A large number of investigations based on laboratory experimental tests have been conducted to study the mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

Wang

Zhu

et al. 2020

Acta Mech. Solida Sin.

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This paper studied the rock dynamic fracture propagation under impact loads elaborately with a determination method proposed to calculate crack propagation dynamic stress intensity factor (DSIF). By utilizing the split-Hopkinson pressure bar, the impact experiments with an improved single cleavage semicircle (ISCSC) specimen were conducted to illuminate the dynamic crack propagation behaviour. Meanwhile, the fracture characteristics and crack propagation velocity were obtained by the crack propagation gauges. Coordinating experiments with a numerical approach, the crack propagation dynamic stress intensity factors were calculated by an experimental-numerical method with fractal theory. Then, a finite difference model was developed based on the tensile fracture softening damage criterion. With the analysis of numerical and experimental results, the crack propagation behaviour and mechanism of crack arrest were discussed sophisticatedly. The results demonstrate that the novel ISCSC specimen shows a definite advantage in determining crack propagation and arrest DSIF. Additionally, the crack arrest DSIF is larger than the average propagation DSIF with a sharp increase. Meanwhile, the numerical simulation results which agree well with the actual crack propagation illustrate that the crack arrest should be dominated by the compressive stress perpendicular to the crack path, and there were several arrest pauses existing in the transitory crack arrest process.

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Effect of Holes on Dynamic Crack Propagation under Impact Loading

Cited by 5 publications

References 27 publications

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Investigation of Mixed-Mode I/II Fracture under Impact Loading Using Split-Hopkinson Pressure Bar

Determination of Stress Intensity Factors under Shock Loading Using a Diffraction-Based Technique

Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

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