Numerical investigation of lateral inertia effect in dynamic impact testing of UHPC using a Split-Hopkinson pressure bar

Ren, Liang; Yu, Xiaoquan; He, Yu Chuan; Wang, Kai; Yao, Hongliang

doi:10.1016/j.conbuildmat.2020.118483

Cited by 22 publications

(5 citation statements)

References 22 publications

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“…Ratios higher than this range increase the axial inertia effect, while ratios lower than this range increase both the radial and axial inertia effects. Ren et al [40] also suggested that the L/D should be between 0.35 and 0.45.…”

Section: Discussionmentioning

confidence: 99%

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Kim,

Park,

Kim

2023

Metals

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The split Hopkinson pressure bar (SHPB) is a machine used for obtaining dynamic material properties at high strain rates of 102–104 s−1. In the SHPB test, the material properties obtained vary depending on the shape of the specimen. In other words, it is important to understand the behavior of the specimen when selecting the specimen dimensions. However, specific standards, such as the size of specimens and bars for the SHPB, have not yet been established. This study investigates the effect of changing the specimen diameter on strain and stress results. Comparison and verification with experimental results were performed using the LS-DYNA program. Specimens are cylindrical titanium grade 1. The specifications of bars and length (L) of the specimens were not changed. The results revealed that the reflected ratio increased, and the transmitted ratio decreased as the area of the specimen decreased. The ratios of these strains are affected by impedance (Z=ρAC). The area reduction of specimens under the same conditions made it possible to obtain dynamic properties at a higher strain rate. It was shown that the impedance relationship and strain rate can be altered by varying the diameter of the specimen without changing the dimensions or material of the bar itself.

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Section: Discussionmentioning

confidence: 99%

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Kim,

Park,

Kim

2023

Metals

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“…Recently, the high speed camera had been developed to observe the failure process, but damage of concrete and the accompanying energy dissipation could not be described quantitatively [10]. Some scholars have studied this problem from a macro perspective through numerical simulation [11]. However, as a kind of composite material, the mechanical properties of LWAC are greatly affected by lightweight aggregates [12].…”

Section: State Of the Artmentioning

confidence: 99%

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Wang¹,

Zhao²,

Wu³

et al. 2021

Int. j. simul. model.

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To reveal the damage evolution and energy dissipation characteristics of lightweight aggregate concrete (LWAC) under impact loading, some simulations of lightweight shale ceramsite concrete under high strain rate impact with a 3D meso-scale model were carried out. After the meso-scale model considering the randomness of the shape and distribution of lightweight aggregates being established and the material parameters of each component being determined by test results, the damage evolution and energy dissipation characteristics of the model under different strain rates were analysed. Results show that the damage evolution of LWAC can be divided into four stages from the perspective of energy. The large deformation and stress concentration firstly occur on the lightweight aggregates, which leads to the generation of micro-cracks. There is an upper limit of the strain energy density of the lightweight aggregate component. The energy absorption efficiency of the specimen first increases and then decreases with the increase of strain rates. The obtained conclusions can provide a reference for understanding the dynamic performances and damage mechanism of LWAC.

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“…The generation of cracks not only affects the forming ability of materials but also accelerates the corrosion rate of materials [35]. Relevant studies show that high strain rate can significantly improve the inertia effect of materials, and the inertia effect helps reduce the crack growth rate in the plastic deformation process [36][37][38]. Polese [39] found that laser shock can effectively inhibit the fatigue crack propagation of a 2024 aluminum alloy sheet.…”

Section: Inertial Effectmentioning

confidence: 99%

Improvement of Formability and Corrosion Resistance of Az31 Magnesium Alloy by Pulsed Current-assisted Laser Shock Forming

H¹,

Sun²,

Ma³

et al. 2021

Preprint

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This study adopted a novel pulse current-assisted laser shock AZ31B sheet micro-forming method (EP-LSF). The mechanism of improving the formability of AZ31B Magnesium Alloy by pulse current assisted laser shock forming and the reason of improving the corrosion resistance were studied for the first time. Through laser shock free bulging experiment, tensile test, optical microscope (OM), and X-ray diffraction, the change in formability was studied. After pulse current assisted laser shock forming, the forming height of AZ31B magnesium alloy increases by 28.8%, the thinning rate decreases by 6.7%, and the strain rate sensitivity coefficient increases to 0.1452. The results show that the decrease of grain size and texture density is the reason why EP-LSF can further improve the formability of AZ31B magnesium alloy. The changes in corrosion resistance were studied by scanning electron microscopy and electrochemical tests. The results show that after EP-LSF, the corrosion current density of AZ31 magnesium alloy decreased, and the electrochemical impedance increased, indicating that this method further improved the corrosion resistance.

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Numerical investigation of lateral inertia effect in dynamic impact testing of UHPC using a Split-Hopkinson pressure bar

Cited by 22 publications

References 22 publications

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Improvement of Formability and Corrosion Resistance of Az31 Magnesium Alloy by Pulsed Current-assisted Laser Shock Forming

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Numerical investigation of lateral inertia effect in dynamic impact testing of UHPC using a Split-Hopkinson pressure bar

Cited by 22 publications

References 22 publications

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Influence of Specimen Diameter for Titanium Grade 1 on SHPB Tests and Its Verification Using FEM

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Improvement of Formability and Corrosion Resistance of Az31&nbsp;Magnesium Alloy by Pulsed Current-assisted Laser Shock Forming

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Product

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Improvement of Formability and Corrosion Resistance of Az31 Magnesium Alloy by Pulsed Current-assisted Laser Shock Forming