Article
Engineering, Marine
Hong Lin, Chang Han, Lei Yang, Lin Zhang, Haochen Luan, Pingping Han, Hao Xu, Shuo Zhang
Summary: This research provides a quantitative optimization scheme for offshore sandwich blast walls with different honeycomb cores, and analyzes the dynamic performance of these walls through numerical simulation. It is found that the sandwich plate with concave arc honeycomb core has the best anti-blast performance, and the influence of geometric parameters on its blast-resistance performance is evaluated.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Xue Li, Rui Kang, Cong Li, Zhiyang Zhang, Zhenyu Zhao, Tian Jian Lu
Summary: In order to minimize the fatal threats of fully confined blasts to surface battleships, ultralight all-metallic sandwich panels with square honeycomb cores are proposed as an alternative to traditional metallic plates for ship construction. A combined experimental and numerical approach is used to investigate the dynamic responses of the sandwich panels under blast loading and compare its blast resistance to that of the monolithic counterpart. Finite element simulations with the CEL approach are performed to explore the physical mechanisms. The results show that the proposed sandwich panel exhibits significantly higher blast resistance due to its consumption of impact energy through various deformation modes.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Ying Li, Xianben Ren, Xiaoqiang Zhang, Yanfei Chen, Tian Zhao, Daining Fang
Summary: The study investigated the deformation and failure modes of aluminum foam-cored sandwich plates through air-blast experiments and finite element modeling, revealing different failure modes and internal stress distributions under various impacts. The research provided a theoretical basis for engineering design by establishing mathematical models to verify the findings.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Zichen Yan, Yan Liu, Junbo Yan, Wen Wu, Fan Bai, Fenglei Huang
Summary: This study compares the blasting characteristics between regular hexagonal and auxetic honeycomb sandwich beams using experimental and numerical analyses. The results reveal that auxetic honeycomb cores have enhanced energy absorption capacity and using unbonded face sheets can reduce global flexural bending.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Lin Jing, Kai Liu, Xingya Su, Xin Guo
Summary: Experimental and numerical studies on the blast response of clamped sandwich panels with layered-gradient aluminium foam cores showed that all layered-gradient core sandwich panels have weaker blast resistance capability compared to ungraded sandwich panels due to reduced structural integrity. For a given effective impulse, the specific energy absorption value of positive gradient sandwich panels is the largest, followed by ungraded sandwich panels, with negative gradient sandwich panels being the lowest.
THIN-WALLED STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Ahsan Ul Haq, G. Gunashekar, Suresh Kumar Reddy Narala
Summary: Sandwich panels with combined auxetic and hexagonal cells are designed to enhance blast protection by improving energy absorption and minimizing dynamic deflection. Experimental results from literature were used to analyze the dynamic response of various geometric cores. Air blast analysis was conducted on the new panel designs, revealing that they absorb more energy and experience less deflection compared to panels with regular hexagonal cores.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Civil
Lang Li, Fusen Jia, Lu Liu, Runpei Yu, Qiancheng Zhang, Lei Li
Summary: The performance of sandwich structures under simultaneous shock and impact loading has been investigated. It was found that the combined loading exhibits a synergistic effect, leading to increased damage and enhanced perforation resistance of the sandwich panels. Numerical analysis revealed that the increased damage was due to a reduction in load-carrying capacity, while the enhanced perforation resistance was a result of delaying the perforation process. The study also showed that the performance and synergistic effect were sensitive to various sandwich geometry parameters.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Mae Oiwa, Toshio Ogasawara, Hajime Yoshinaga, Tsuyoshi Oguri, Takahira Aoki
Summary: This study aimed to establish a bending strength prediction method for a thin CFRP face sheet/Nomex honeycomb sandwich panel, with successful results using both detailed core model and solid core model. The results indicated that the solid core model is more suitable for estimating the bending strength of this sandwich panel.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Ganchao Chen, Yuansheng Cheng, Pan Zhang, Sipei Cai, Jun Liu
Summary: The abstract discusses the attention attracted by the negative Poisson's ratio of auxetic double arrowhead honeycombs and their unique mechanical properties. It presents the production of metallic DAHs and their use as sandwich cores for sandwich panels, as well as an experimental investigation on their dynamic responses under air blasts. The study highlights the influence of core configurations on deformation/failure modes, mechanisms, and blast resistance, providing insights for design, manufacturing, and optimization of auxetic sandwich structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Weimin Jiang, Junmeng Zhou, Jiayi Liu, Mangong Zhang, Wei Huang
Summary: In this study, the free vibration behaviors of carbon fiber composite sandwich plates with reentrant honeycomb cores were investigated using experiment, theory, and finite element method. The composite sandwich plates were designed and fabricated, and their modal characteristics were tested under simply supported boundary conditions. The effects of relative densities and dimensions on the natural frequencies were analyzed. The theoretical results were compared with experimental and finite element calculation results, showing good accuracy of the theory and FEM in predicting the natural frequencies.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Mechanical
Ganchao Chen, Yuansheng Cheng, Pan Zhang, Jun Liu, Changhai Chen, Sipei Cai
Summary: The study introduced a metallic auxetic double arrowhead honeycomb core sandwich panel and investigated its deformation response and energy dissipation characteristics under air blasts. Results indicated that the deformation response of the panel was closely related to their deformation/failure mechanisms. Changing the core web thickness and inclined angles significantly influenced the panel deformation response. Increasing the number of core layers led to a more remarkable decrease in permanent deflections.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
Nam V. Nguyen, H. Nguyen-Xuan, Tan N. Nguyen, Joowon Kang, Jaehong Lee
Summary: This study proposes a computational approach for examining the behaviors of auxetic honeycomb sandwich plate structures, utilizing a combination of polygonal meshes and advanced deformation theory. By incorporating negative Poisson's ratio auxetic honeycomb cells and graphene nanoplatelets reinforcement, the sandwich plate structures achieve ultra-light features and enhanced stiffness. Bolotin's approach is utilized to determine the dynamic instability region of the sandwich plate structures.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Murlidhar Patel, Shivdayal Patel, Suhail Ahmad
Summary: The explosive blast poses a significant threat in the form of terrorist attacks on defense, aerospace, and civilian structures. In order to protect human lives and property, researchers have been searching for blast-resistant structures. This study designed a stainless-steel sandwich structure and investigated the performance of aluminum foam-filled honeycomb and carbon fiber reinforced polymer (CFRP) with steel skins. The results showed that using lightweight FRP on the front and back skins of the sandwich structure reduced deflection and improved energy absorption, enhancing the blast resistance.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Mechanical
Chengjian Zhang, P. J. Tan, Ye Yuan
Summary: This paper presents experimental and numerical results on the deformation and failure of fully-clamped square steel plates under confined blast loading, with a focus on the effect of pre-formed holes and their geometry. The results show that the geometry of the pre-formed holes plays a crucial role in the deformation and failure of the plates. Numerical simulations successfully predict the observed inelastic deformation and crack propagation. It is also found that venting by the pre-formed holes can attenuate the secondary blast waves but does not alleviate the peak pressure of the primary blast wave.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Mechanical
Faizal Arifurrahman, Richard Critchley, Ian Horsfall
Summary: The study focused on the use of auxetic materials as core materials for sandwich panels to mitigate the impact of mines on defense vehicles. Experimental results showed that auxetic and foam core panels were effective in reducing peak structural loading and impulse. Air-filled panels were most effective in reducing rear plate deflection, although variations were reported between capture methods.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
P. B. Ataabadi, D. Karagiozova, M. H. Shaterzadeh, M. Alves
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Mechanical
G. S. Langdon, S. Kriek, G. N. Nurick
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2020)
Article
Mechanics
S. E. Rigby, T. J. Lodge, S. Alotaibi, A. D. Barr, S. D. Clarke, G. S. Langdon, A. Tyas
Article
Engineering, Mechanical
R. Qi, G. S. Langdon, T. J. Cloete, S. Chung Kim Yuen
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2020)
Article
Engineering, Civil
Jianjun Zhang, Dora Karagiozova, Guoxing Lu, Pengwan Chen
Summary: This work investigates the large, plastic deformation and energy absorption characteristics of zig-zag folded metamaterials BCHn under quasi-static compression, using analytical and numerical methods. The zig-zag folded materials outperform Miura-ori based materials in energy absorption, and their tunable geometric parameters allow better tailoring of mechanical properties. Comparisons with hexagonal honeycomb materials show that selecting parameters of the BCHn materials can result in superior energy absorption characteristics.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Mechanical
R. J. Curry, G. S. Langdon
Summary: This paper presents new insights into the critical influence of explosive charge backing on the impulse transfer and transient response characteristics of plates subjected to close-proximity air blast loading. The increase in impulse transfer caused by metal backing was found to be 3-5 times larger than for air backing, indicating the significant impact of charge backing on blast protection engineering.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Muhammad Y. Oomar, Arnaud G. Malan, Roy A. D. Horwitz, Bevan W. S. Jones, Genevieve S. Langdon
Summary: This paper introduces an all-Mach method for two-phase inviscid flow with surface tension effects, combining a modified HLLC solver with the CICSAM VoF method to achieve shock capturing and accurate interface tracking characteristics. Reconstruction of non-conservative variables is used for robustness and accuracy, with liquid-gas interface curvature computed through height functions and convolution. Validation using various test cases shows agreement with previous experimental and numerical work, particularly demonstrating improved accuracy in volume fraction and energy fields with the HLLC-VoF combination.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Biomedical
J. W. Denny, A. S. Dickinson, G. S. Langdon
Summary: This paper evaluates existing PBI criteria and provides ideal blast wave parameters for blast injury research and clinical practice. Simulating realistic and injury-specific blast conditions can support blast injury research, emergency response, and hazard preparedness.
MEDICAL ENGINEERING & PHYSICS
(2021)
Review
Medicine, General & Internal
J. W. Denny, A. S. Dickinson, G. S. Langdon
Summary: This study focuses on the direct impact of primary blast injuries (PBIs) on the human body, specifically on organs containing air. It provides predictive criteria and parameters for generating clinically relevant loading conditions. The study also proposes guidelines for blast wave parameters and phase durations to ensure realistic and practical experimental setups. These findings can inform the design of PBI experimental investigations.
BMJ MILITARY HEALTH
(2023)
Article
Mechanics
G. S. Langdon, S. Gabriel, C. J. von Klemperer, S. Chung Kim Yuen
Summary: This study investigates the response and failure of MDF panels subjected to air-blast loading, providing unique insights into the cracking and fragmentation of MDF. The experimental results show that blast-loaded MDF panels exhibit multiple surface cracks, substantial in-plane cracking, and reduced stiffness due to internal damage caused by cracking. The findings from this study can be valuable for blast protection engineers and modellers simulating damage from explosive events involving MDF furnishings.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
D. Karagiozova, M. Alves
Summary: The study examines the saturated impulse phenomenon in a circular hollow beam under rectangular pressure pulse loading, developing a simplified 2DoF model to analyze the effects of local and global deformations on the beam response. Elastic deformations of the hollow beam are neglected in the analytical formulation, and a rigid-plastic analysis method is used along with finite element simulations to verify the model and investigate the influence of elasticity on the beam response. The study suggests that the analytically predicted saturated impulse can serve as a lower bound estimate for a given beam geometry's saturated impulse, while also highlighting the underestimated saturated pressure pulse duration due to the disregard of stored elastic energy in the beam.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Chemistry, Physical
Sherlyn Gabriel, Christopher J. von Klemperer, Steeve Chung Kim Yuen, Genevieve S. Langdon
Summary: This study investigates the blast response of sandwich panels with lightweight foam cores and asymmetric glass fibre epoxy face sheets, revealing different failure modes between thinner and thicker facesheets. Residual oscillations in the sandwich panels are larger, and the material composition and testing conditions influence the observed failure modes.
Article
Chemistry, Multidisciplinary
Genevieve S. Langdon, Ruixuan Qi, Trevor J. Cloete, Steeve Chung Kim Yuen
Summary: This paper investigates the influence of ball size on the flight characteristics and damage of a ball bearing embedded in a rear detonated cylindrical charge. The findings provide valuable insights for blast protection engineers considering the effects of embedded projectiles in improvised explosive devices.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Composites
Sherlyn Gabriel, Genevieve S. Langdon, Christopher J. von Klemperer, Steeve Chung Kim Yuen
Summary: This paper evaluates the susceptibility to damage of sustainable natural fibers and bio-based resins in fiber reinforced polymers (FRPs) under explosive detonation. Flax and jute FRP panels were blast tested and compared to glass FRP panels of equivalent mass. The results show the importance of fiber strength and stiffness, and the lesser influence of resin system. A modified non-dimensional analysis approach is proposed for predicting the peak displacement of FRPs during blast events.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2022)
Article
Mechanics
M. Alteneiji, K. Krishnan, Z. W. Guan, W. J. Cantwell, Y. Zhao, G. Langdon
Summary: This paper presents experimental and numerical studies on the dynamic behavior of aluminium matrix syntactic foams. The compressive crush behavior of the material is found to be strain-rate sensitive. The behavior under high strain-rate loadings and the underlying failure mechanisms are analyzed to evaluate the effective mechanical performance. The numerical model is verified and the predictions are in good agreement with the experimental results.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)
