Article
Engineering, Multidisciplinary
Arun R. Kumar, Vaibhav Pathak
Summary: The study focuses on reducing shock waves in the flow field using novel geometric passages that create multiple shock reflections and diffractions. Numerical simulations showed that the zig-zag passage with cylindrical obstructions produced the greatest shock attenuation among the various designs. The cyclic shock reflection and diffraction process in the new zig-zag design helps diffuse shock wave energy without obstructing the flow field, leading to a significant reduction in shock strength.
DEFENCE TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Edward Chern Jinn Gan, Alex Remennikov, David Ritzel
Summary: This paper investigates the potential of using trees as natural blast barriers and reveals their ability to attenuate far-field blast waves and protect infrastructure targets through experimental results. A numerical model based on Computational Fluid Dynamics in ANSYS FLUENT is developed to explain the blast mitigation mechanism of barriers against far-field blast loads and to interpret experimental observations.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Masoud Rahmani, Alireza Naddaf Oskouei, Amin Moslemi Petrudi
Summary: The study investigated the shock wave mitigation capabilities of a sandwich panel with a granular core, finding that using appropriate materials and core thickness can effectively reduce shock waves.
DEFENCE TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Dong Ma, Cheng Wang, Wenlong Xu, Shiyu Jia, Fangfang Qi
Summary: A novel shear thickening gel with micro-scale hard/soft interface structure and low reaction temperature, named TH, was proposed. The gel showed increased storage modulus with increasing shear frequency, indicating its ability to dissipate or store more energy. TH demonstrated good adhesion with Kevlar fabrics and effectively filled the gap between fabrics. The presence of TH changed the stress propagation routes and improved the impact resistance of Kevlar fabrics.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Aerospace
Xiang Chen, Ningbo Zhao, Hongtao Zheng, Xiongbin Jia, Mingzhang Pan, Yifan Sun
Summary: A novel compact initiator based on shock wave focusing is proposed for fast detonation initiation. Numerical investigation reveals the mechanism and effects of ignition energy and energy release time on detonation initiation. The study shows that flame acceleration process can be divided into three stages, and detonation initiation time increases with the decrease of ignition energy. Increasing energy release time can lead to longer run-up time and distance for detonation initiation.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
B. M. Alotaibi
Summary: The nonlinear propagation of dust-acoustic waves in a weakly collisional dusty plasma was investigated, with various types of wave solutions obtained. Explosive waves were found to have both positive and negative effects, being important in atmospheric phenomena and engineering applications such as metal coating.
Article
Engineering, Mechanical
Nhi H. Vo, Thong M. Pham, Kaiming Bi, Wensu Chen, Hong Hao
Summary: A dual-meta panel functioning as a sacrificial cladding is proposed in this study to investigate its blast mitigation capacity. The panel shows advantages in controlling stress wave propagation and energy absorption, leading to efficient resistance against blast loadings.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Engineering, Civil
Yanchao Shi, Ye Hu, Shaozeng Liu, Jian Cui, Li Chen
Summary: This study proposes the concept of using a hanging granite slab to mitigate blast loads on reinforced concrete columns. A finite element model is established to simulate the interaction between the blast wave and the dry-hanging granite slab, revealing the protection mechanism of the RC column. The influences of slab thickness and hanging distance on blast mitigation are investigated. Blast load mitigation factors and their empirical models are proposed as a function of scaled distance, slab thickness, and hanging standoff distance.
ENGINEERING STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Chitralekha Dey, Amol A. A. Gokhale, Shiba N. N. Sahu
Summary: This study investigates the factors controlling stress at the back face of end wall-mounted shock-loaded aluminum foam. Plastic deformation of the foam occurs when the applied shock pressure exceeds its plastic strength, generating a compaction wave traveling at a speed lower than the shock velocity. The reflection and momentum transfer of the wave at the end wall lead to shock amplification. As the foam length increases, the stress at the end wall decreases, resulting in shock mitigation. A relationship between compaction wave characteristics, foam densification, and stress at the end wall is established.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Murlidhar Patel, Shivdayal Patel
Summary: By combining square and circular honeycombs in various ways, innovative blast-proof steel sandwich panels were developed in this numerical study, which have excellent explosion and impact resistance capabilities. Further work was carried out to achieve successive improvements in the efficiently designed steel sandwich panel's blast mitigation performance by applying different patterns of Al foam filling and fiber metal laminate (FML) facing.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Aerospace
Heng Liu, Veronica Eliasson
Summary: Geometrical shock dynamics (GSD) is an efficient model for predicting the position, shape, and strength of a shock wave. Preserving the intact post-shock flow term is crucial for accurately predicting blast motion when modeling blast wave propagation.
Article
Materials Science, Composites
Dong Ma, Cheng Wang, Wenlong Xu, Shiyu Jia
Summary: This study focuses on improving the shock wave mitigation performance of polymer composites by adding different nanocarbon fillers. The results show that the addition of nanocarbon fillers can enhance the shock wave mitigation ability of epoxy resin, with graphene fillers demonstrating the best effect.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Physical
Ying Yuan, Yiqiang Cai, Dongfang Shi, Pengwan Chen, Rui Liu, Haifu Wang
Summary: This research studied the control of shock-induced energy release characteristics of PTFE/Al-based energetic material by adding oxides. The experiments showed that the oxides controlled the energy release characteristics by coupling impact velocities and oxide characteristics. These conclusions can guide the design of PTFE-based energetic materials.
Article
Engineering, Mechanical
Yuta Sugiyama, Kunihiko Wakabayashi, Tomoharu Matsumura, Yoshio Nakayama
Summary: The study found that the internal diameter ratio between the chamber and the passageway in an underground magazine affects the impact of the blast wave outside, with a smaller ratio leading to more significant impact. Using shock tube theory can better understand the characteristics of the blast wave at the exit and the influence of the total energy release rate on blast wave strength.
JOURNAL OF ENGINEERING MECHANICS
(2021)
Article
Engineering, Mechanical
Manish Suresh Raut, Mital Limjibhai Patel, Harshit Verma, S. Gopalakrishnan, Gopalan Jagadeesh
Summary: This paper investigates the performance of a novel bio-inspired face sheet in reducing the effects of blast loading. The face sheet comprises an optimized bio-inspired suture structure sandwiched between two aluminium plates. Structural optimization using Genetic Algorithm is performed to obtain the suture profile, and the dynamic responses are analyzed using a viscoelastic finite element formulation. Experimental testing in a vertical shock tube validates the results obtained using commercial finite element software Abaqus. Numerical evaluation is conducted on a hybrid sandwich structure composed of an aluminium honeycomb core sandwiched between the bio-inspired face sheets for blast resistance performance. The study shows that the proposed face sheet design significantly reduces stresses and core stresses compared to conventional aluminium face sheet-based sandwich structures. Parametric studies on axial and transverse shock loading provide further insight into wave propagation characteristics of the hybrid sandwich structures.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)