Behaviour of Foam Concrete under Impact Loading Based on SHPB Experiments

He, Yongliang; Gao, Mingshi; Zhao, Hongchao; Zhao, Yichao

doi:10.1155/2019/2065845

Cited by 11 publications

(6 citation statements)

References 28 publications

(32 reference statements)

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“…The incident, reflected, and transmitted waves were amplified to facilitate acquisition and processing. Lastly, the two-wave method was adopted for data processing [ 18 , 19 , 20 ].…”

Section: Experimental Methodsmentioning

confidence: 99%

Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material

Wang

et al. 2021

Polymers

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Three-dimensional printing is becoming increasingly popular because of its extensive applicability. However, printing materials remain limited. To determine the mechanical properties of polylactic acid (PLA) and copper powder-filled polylactic acid (PLA-Cu) materials subjected to static and dynamic loading, stress–strain curves were obtained under the conditions of different strain rates using a universal material testing machine and a separated Hopkinson pressure bar experimental device. Scanning electron microscopy (SEM) was used to analyze the micro-morphology of the quasi-static compression fracture and dynamic impact sections. The results revealed that the yield stress and elastic modulus of the two materials increased with increasing strain rate. When the strain rate reached a critical point of 0.033 s−1, the rate of crack propagation in the PLA samples increased, resulting in the material undergoing a change from ductile to brittle. The strength of the material subjected to dynamic loading was significantly higher than that subjected to quasi-static loading. The SEM image of the PLA-Cu material revealed that copper powder was evenly distributed throughout the 3D-printed sample and that stress initially began to concentrate at the defect site corresponding to the interface between the copper powder and PLA matrix; this resulted in comparatively lower toughness. This finding was consistent with the photographs captured via high-speed photography, which confirmed that the destruction of the specimen was accompanied by an explosive crushing process. Additionally, a Zhu–Wang–Tang constitutive model was used to fit the experimental results and establish a viscoelastic constitutive model of the material. By comparing the dynamic stress–strain curve to the theoretically predicted curve, we found that the established constitutive model could predict the mechanical properties of the PLA-Cu material with reasonable accuracy when the strain was below 7%.

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“…The incident, reflected, and transmitted waves were amplified to facilitate acquisition and processing. Lastly, the two-wave method was adopted for data processing [ 18 , 19 , 20 ].…”

Section: Experimental Methodsmentioning

confidence: 99%

Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material

Wang

et al. 2021

Polymers

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“…e shock wave is considerably weakened through the scattering and absorption provided by the soft structure, and, consequently, the stability of the support structure can be maintained. Figure 14 shows the soft structure used for the mine roadway [25,26]. e soft structure is essentially a wave absorption zone [27,28].…”

Section: Energy Absorption Of a Soft Structurementioning

confidence: 99%

Mechanism and Procedure of Repeated Borehole Drilling Using Wall Protection and a Soft Structure to Prevent Rockburst: A Case Study

Gao

et al. 2021

Shock and Vibration

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With the increasing mining depth of coal mines, the occurrence of rockburst, especially in mine roadways, is becoming critical as a severe dynamic disaster. This paper explores the stability control of deep mine roadways and solves the contradiction between the support and pressure relief of roadways by studying the use of an internal steel pipe for wall protection and a soft structure for energy absorption during repeated borehole drilling. Numerical simulations are performed to examine the effects of active support technology on the support structure during repeated drilling. Internal steel pipes can effectively prevent the support structure from being damaged. When the soft structure cracks, the energy transmitted from the rockburst to the roadway is significantly reduced. According to the deformation and failure characteristics of the surrounding rock of the 21170 roadway, the combination of anchor active support, hydraulic lifting shed support, and soft structure energy absorption is proposed. An engineering case study shows that the support method can effectively maintain the stability of the surrounding rock and ensure the safe mining of the working face. The proposed control method can provide reference for the prevention and control of rockburst in mine roadways under similar geological conditions.

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“…e coal fragments after the impact test were collected and sieved using standard coal sample sieves of 0.5, 1, 10, 20, and 30 mm, respectively, for statistical analysis. Figure 13 and Table 3 show the fractal dimension of the fragments in the failure test which was calculated using equations ( 4) and (5).…”

Section: Particle Size Analysis Of Fragmented Coalmentioning

confidence: 99%

“…However, the high horizon of the downhole impact source and the difficulty of accurately determining the impact source point make it generally difficult to achieve this level of protection [4]. A secondary level of protection is to construct a soft structural layer in the rock surrounding the roadway in the propagation path of the impact wave [5]. A final level of protection involves the installation of anti-impact energy-absorbing components on the support in the propagation path [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of Coal Weakenedby Acidic and Alkaline Solutions

Gao

Zhao

et al. 2020

Advances in Civil Engineering

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A novel method for fracturing coal is presented in this paper. A chemical solution is injected into coal under high pressure, whereby the coal is fractured and subsequently weakened by chemical erosion over time to produce an anti-impact soft structure. In this study, the mechanical properties of coal under chemical erosion were investigated, and the fracturing design parameters were optimized. The uniaxial compression test and the split Hopkinson pressure bar (SHPB) test were used to determine the dynamic and static mechanical properties of coal after 20 days of immersion in different chemical solutions. After chemical solution erosion, the dynamic and static compressive strengths and elastic modulus of the coal decreased according to an exponential power law in the damage variable. The chemical treatment increased the duration of the pore compaction stage and decreased that of the elastic deformation stage, while decreasing the brittleness and increasing the ductility of coal. The acoustic emission (AE) curve of the immersed coal samples consisted of four stages corresponding to those of the stress-strain curve: pore compaction-closure, a slowly rising linear elastic regime, steady-state prepeak crack propagation, and unsteady crack propagation at the peak strain. The increase in the damage variable of the coal sample from chemical erosion led to a lower dissipated energy, a higher fractal dimension, and a more fragmented coal sample. The effect of the investigated chemical solutions on weakening the coal mechanical properties decreased in the following order: alkaline solution > acidic solution > NaCl solution > distilled water. The experimental results provide a reference for weakening fractured coal seams.

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Behaviour of Foam Concrete under Impact Loading Based on SHPB Experiments

Cited by 11 publications

References 28 publications

Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material

Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material

Mechanism and Procedure of Repeated Borehole Drilling Using Wall Protection and a Soft Structure to Prevent Rockburst: A Case Study

Study on the Mechanical Properties of Coal Weakenedby Acidic and Alkaline Solutions

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