Size effect on fracture behavior of quasi-brittle materials during uniaxial compression tests

Wang, Junjie; Lv, Chuan; Huang, Shiyuan; Qiu, Zhen-Feng

doi:10.1007/s00419-023-02431-2

Cited by 4 publications

(3 citation statements)

References 57 publications

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“…As can be seen from Figure 19, the theoretical prediction value of the tension crack initiation angle when α = 0.8 deviates significantly from the experimental value, and they are not in agreement. Wang et al [46] found a similar pattern in the compression-shear fracture test of gypsum, and the rc obtained by back-calculation based on the test results was larger than that calculated by Equation (11), indicating that Equation (11) may not be suitable for the calculation related to compressive-shear mixed mode fractures. The influence of crack inclination angle on the distribution patterns of the maximum circumferential stresses obtained by fitting and empirical formula corresponding to two values of relative critical size α is shown in Figure 19.…”

Section: Comparison Of Test Results and Theoretical Values At Differe...mentioning

confidence: 96%

A Theoretical and Experimental Investigation on the Fracture Mechanism of Center-Symmetric Closed Crack in Compacted Clay under Compression–Shear Loading

Huang,

Zhang,

et al. 2023

Symmetry

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In this study, a modified maximum tangential stress criterion by considering T-stress and uniaxial compression tests have been utilized to theoretically and experimentally reveal the fracture initiation mechanism of a center-symmetric closed crack in compacted clay. The results show that wing cracks occur in the linear elastic phase of the stress-strain curve. In the plastic phase of the stress-strain curve, the wing cracks extend gradually and the shear cracks occur. The crack initiation stress and peak stress of compacted clay first decrease with the rise in pre-crack inclination angle (β = 0°–40°), and then increase with the rise in pre-crack inclination angle (β = 50°–90°). When the pre-crack inclination angle is relatively small or large (β ≤ 10° or β ≥ 70°), the crack type is mainly tension cracks. Secondary shear cracks occur when the pre-crack inclination angle is 10°–80°. When the dimensionless crack length is larger than 0.35, the crack types include wing-type tension cracks and secondary shear cracks. The experimental results were compared with the theoretical values. It was found that the critical size rc of compacted clay under compression-shear loading was 0.75 mm, smaller than the value calculated by the empirical formula (12 mm). The MTS criterion considering T-stress can be used to predict the compression-shear fracture behavior of compacted clay.

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Section: Comparison Of Test Results and Theoretical Values At Differe...mentioning

confidence: 96%

A Theoretical and Experimental Investigation on the Fracture Mechanism of Center-Symmetric Closed Crack in Compacted Clay under Compression–Shear Loading

Huang,

Zhang,

et al. 2023

Symmetry

Self Cite

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“…The maximum axial load and axial displacement were 3 kN and 40 mm, respectively, the precision was 0.1 N, and the loading rate ranged from 0.12 to 30 mm/min. In this NDB tests, displacement-controlled loading was adopted at a rate of 0.8 mm/min [16,41], and the bottom was a fixed steel support. including a servo motor, load sensor, displacement sensor, telescopic rod, fixture, and data acquisition software.…”

Section: Specimen Preparation Methods and Loading Instrumentmentioning

confidence: 99%

“…The friction coefficient of the compacted clay-steel interface was determined using the method [41,42] shown in Figure 13. First, the prepared NDB specimen was placed in the middle of the steel plate.…”

Section: Friction Coefficient Of the Compacted Clay-steel Interfacementioning

confidence: 99%

Effects of Support Friction on Mixed-Mode I/II Fracture Behavior of Compacted Clay Using Notched Deep Beam Specimens under Symmetric Fixed Support

Huang

Wang

et al. 2023

Symmetry

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This paper investigates the effects of support friction on mixed-mode I/II fracture behavior of compacted clay using notched deep beam (NDB) specimens under symmetric fixed support. Numerical models of 330 NDB specimens were established considering the crack inclination angle, crack length, support span, and support friction coefficient, and the normalized fracture parameters (YI, YII, and T*) of NDB specimens were calibrated. The numerical results showed that the values of YI, YII, and T* decreased at different degrees after considering the support friction. Notably, the support friction coefficient could significantly change the loading pattern at the crack tip. To verify this phenomenon, 12 compacted clay NDB specimens were prepared, and a mixed-mode I/II fracture test was performed under fixed support conditions; the phenomenon of asymmetric crack propagation was studied. The test data were processed using the numerical calibration results of YI, YII, and T* with and without consideration of friction. Afterward, the test data were compared and analyzed by combining the generalized maximum tangential stress (GMTS) and the maximum tangential stress (MTS) criteria. The analysis indicated that the real fracture characteristics of compacted clay NDB specimens could not be reflected when conducting mixed-mode I/II fracture tests under symmetric fixed support conditions if the test results were analyzed by YI, YII, and T* without considering support friction, as in previous studies.

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Optimization of the tungsten inert gas welding parameters of mild steel thin sheets through the gray relational analysis method

Rahui,

Allouch,

Alami

2024

Int J Adv Manuf Technol

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Size effect on fracture behavior of quasi-brittle materials during uniaxial compression tests

Cited by 4 publications

References 57 publications

A Theoretical and Experimental Investigation on the Fracture Mechanism of Center-Symmetric Closed Crack in Compacted Clay under Compression–Shear Loading

A Theoretical and Experimental Investigation on the Fracture Mechanism of Center-Symmetric Closed Crack in Compacted Clay under Compression–Shear Loading

Effects of Support Friction on Mixed-Mode I/II Fracture Behavior of Compacted Clay Using Notched Deep Beam Specimens under Symmetric Fixed Support

Optimization of the tungsten inert gas welding parameters of mild steel thin sheets through the gray relational analysis method

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