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Abstract
Feasibility of rock dynamic properties by split-Hopkinson pressure bar (SHPB) was experimentally and numerically evaluated with ANSYS/LS-DYNA. The effects of different diameters, different loading rates, and different propagation distances on wave dispersion of input bars in SHPB with rectangle and half-sine wave loadings were analyzed. The results show that the dispersion effect on the diameter of input bar, loading rate, and propagation distance under half-sine waveform loading is ignorable compared with the rectangle wave loading. Moreover, the degrees of stress uniformity under rectangle and half-sine input wave loadings are compared in SHPB tests, and the time required for stress uniformity is calculated under different above-mentioned loadings. It is confirmed that the stress uniformity can be realized more easily using the half-sine pulse loading compared to the rectangle pulse loading, and this has significant advantages in the dynamic test of rock-like materials. Finally, the Holmquist-Johnson-Concrete constitutive model is introduced to simulate the failure mechanism and failure and fragmentation characteristics of rock under different strain rates. And the numerical results agree with that obtained from the experiment, which confirms the effectiveness of the model and the method.
Highlights
Understanding the dynamic characteristics of rocks under higher strain rate is significant for either engineering stability or rock fragmentation efficiency
split-Hopkinson pressure bar (SHPB) experimental technique has been widely used in geotechnical evaluations and substantial efforts have been made to study dynamic mechanical properties of rocks [1,2,3,4,5,6,7,8,9]
The damage and rupture process of coal-rock is accompanied by acoustic emission (AE) by Wen et al [12]; the results show that coal-rock’s size influences the uniaxial compressive strength, peak strain, and elastic modulus of Advances in Materials Science and Engineering
Summary
Understanding the dynamic characteristics of rocks under higher strain rate is significant for either engineering stability or rock fragmentation efficiency. Since the first use of split-Hopkinson pressure bar (SHPB) system by Kolsky (1949), extensive studies have been performed to investigate dynamic mechanical properties of different materials. SHPB experimental technique has been widely used in geotechnical evaluations and substantial efforts have been made to study dynamic mechanical properties of rocks [1,2,3,4,5,6,7,8,9]. The result shows that the dynamic compressive strength and dynamic tensile strength of lands measurement using SHPB are valid and reliable by Dai et al [10]. The damage and rupture process of coal-rock is accompanied by acoustic emission (AE) by Wen et al [12]; the results show that coal-rock’s size influences the uniaxial compressive strength, peak strain, and elastic modulus of Advances in Materials Science and Engineering
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