Numerical study and experimental validation of blastworthy structure using aluminum foam sandwich subjected to fragmented 8 kg TNT blast loading

Pratomo, Arief Nur; Santosa, Sigit Puji; Gunawan, Leonardo; Widagdo, Djarot; Putra, Ichsan Setya

doi:10.1016/j.ijimpeng.2020.103699

Cited by 29 publications

(8 citation statements)

References 46 publications

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“…where q is the explosive heat, r is the radius of the spherical charge, ρ is the explosive density, R is the energy field radius of the spherical charge, and k is the correlation coefficient of energy attenuation. e local field characteristic theorem of waves points out that the reflection or transmission of the incident wavefront with arbitrary shapes at any point on the curved interface is the same as that of plane waves [32,33]. erefore, the transmission and reflection problems of arbitrary incident wavefront on the curved interface can be simplified as plane wave problems.…”

Section: Dynamic Response and Failure Criterion Of Rock In Column Expmentioning

confidence: 99%

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Zhang

Wang

et al. 2021

Shock and Vibration

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In view of the near slope blasting in Barun open-pit mine, which has merged sublevel mining, the operation safety conditions of middle-sized and large equipment in the second phase expansion are poor and need urgent improvement. To increase the efficiency of expansion and reduce costs, a 24-m-high bench and large spacing parameter for loosening blasting are proposed. The analysis of the physical mechanism of the stress wave attenuation in the rock indicates that the cylindrical charge is equivalent to several spherical charges. Considering the pressure attenuation, reflection, transmission, and superposition of the spherical charge after the equivalence, a double exponential function correction equation of the stress wave attenuation is obtained based on the Mises strength criterion. The stress of any point in the rock medium with various spacing parameter is obtained by calculation. ANSYS/LS-DYNA was used to simulate and study the stress distribution of a 24-m-high bench with various spacing parameter. Meanwhile, the accuracy of the correction equation was verified. The parameters of the high-bench blasting with good effect and low cost were determined to be 15 m × 5.5 m, and field tests were carried out. Results show that the large spacing parameter for 24-m-high bench loosening blasting in Barun open-pit mine is efficient and economical in medium-hard rock blasting. This study provides a reference for the practical exploration of the expansion of high benches in open-pit mines in China. The calculation error of the corrected double exponential function is near the numerical simulation result. It is suitable for all kinds of professional designers.

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Section: Dynamic Response and Failure Criterion Of Rock In Column Expmentioning

confidence: 99%

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Zhang

Wang

et al. 2021

Shock and Vibration

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“…Aluminum foam has the characteristics of light weight, high strength, high energy absorption efficiency and excellent electromagnetic shielding performance. It is widely used for the protection of light vehicles and armored vehicles, and has also become the preferred protective material for shelter structure 1,2 . However, the compressive strength of lightweight aluminum foam is reduced due to the existence of pores.…”

Section: Introductionmentioning

confidence: 99%

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Guo

Song

Sun

et al. 2023

J of Applied Polymer Sci

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A polyurea coating was prepared to enhance the impact protection performance of aluminum foam, and its mechanical properties were analyzed. Polyurea‐coated aluminum foam composite specimens were prepared by coating the polyurea on the surface of aluminum foam. The mechanical properties of composite specimens under quasi‐static and dynamic loading were tested, and the stress–strain relationship at different strain rates was analyzed. The deformation process and failure mode of typical specimens under different loading conditions were discussed. The influence of polyurea coating on the energy absorption characteristics of aluminum foam was explained. The results show that when the polyurea is coated on the end surface of aluminum foam specimen, the sawtooth oscillation in the yield plateau stage of the stress–strain curve is weakened. The existence of polyurea coating makes the stress transfer of cell wall of aluminum foam uniform, and can effectively prevent the damage caused by the splash of aluminum foam fragments under high‐speed impact load. Coating polyurea on the opposite to load‐receiving surface of aluminum foam specimen can effectively improve the yield stress of composite specimen under dynamic load, and make the specimen still maintain good integrity after failure. When the polyurea is coated on the end surface of aluminum foam specimen, the final energy absorption per unit volume and the ideal energy absorption efficiency peak of the specimen are improved.

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“…The influence of projectile rotation on the infrared extinction performance of a smokescreen was studied, and the similarity ratio between the simulation and experiment was 94%. The method of combining optical properties with physical scenes can solve the problem caused by over-simplification of the model [ 11 ]. Additionally, Gaussian, Lagrangian, and Eulerian diffusion models are commonly used to analyse the distribution of aerosol particles during a smoke explosion [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of factors influencing infrared extinction area of explosive smokescreen

Fang

et al. 2022

Heliyon

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Numerical study and experimental validation of blastworthy structure using aluminum foam sandwich subjected to fragmented 8 kg TNT blast loading

Cited by 29 publications

References 46 publications

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Optimization and Application of Spacing Parameter for Loosening Blasting with 24‐m‐High Bench in Barun Open‐Pit Mine

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Analysis of factors influencing infrared extinction area of explosive smokescreen

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