Article
Engineering, Mechanical
Sipei Cai, Pan Zhang, Wenxi Dai, Yuansheng Cheng, Jun Liu
Summary: This research aimed to improve the blast performance of trapezoidal corrugated core sandwich panel under air blast loading through the establishment of finite element models, kriging models, and correlation analyses. Multi-objective design optimization was conducted, revealing that a decrease in the maximum back face deflection would lead to undesirable deterioration in specific energy absorption. The design on Pareto fronts depended upon stand-off distance, and optimized designs showed a great potential in performance improvement.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Mechanics
Rajendra Prasad Bohara, Steven Linforth, Tuan Nguyen, Abdallah Ghazlan, Tuan Ngo
Summary: This paper introduces a protective sandwich structure with dual-mechanism auxetic compression and tension behavior and evaluates its protective performance through numerical simulations. The results show that the sandwich structure has excellent performance in terms of energy absorption, stress mitigation, and deflection control, and offers better protection compared to an equivalent solid structure.
COMPOSITE STRUCTURES
(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
Engineering, Civil
Fukun Xia, T. X. Yu, Yvonne Durandet, Dong Ruan
Summary: This paper investigates the mechanical response of aluminum corrugated sandwich panels subjected to longitudinal loading, examining the effects of geometric configurations on deformation mode, peak force, and specific energy absorption. It is found that thicker core webs result in greater energy absorption, and that the energy dissipated by sandwich panels can be tailored by varying the geometry of the core. Based on experimental and simulation observations, a theoretical analysis using energy method is used to predict the crushing force of panels during large deformation.
THIN-WALLED STRUCTURES
(2021)
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
Engineering, Multidisciplinary
Xin Wang, Chao He, Zengshen Yue, Xue Li, Runpei Yu, Haibo Ji, Zhenyu Zhao, Qiancheng Zhang, Tian Jian Lu
Summary: This study systematically investigates the effect of polyurea coating on the shock resistance of fully-clamped metallic corrugated core sandwich panels against high-velocity aluminum foam projectile impact. The results show that the presence of polyurea coating helps reduce permanent deflection and prevent shear failure. The benefits of polyurea coating in mitigating impact deformation remain stable regardless of the projectile momentum, and thicker, larger, and impact-side coating is preferred. The improved performance is mainly attributed to enhanced plastic bending moment and membrane force in the polyurea-coated sandwich panel.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Mechanical
Kun Liu, Li Ke, Yanyan Sha, Guangming Wu, Peng Wang, Zili Wang
Summary: This study investigates the dynamic response characteristics of laser-welded corrugated sandwich panels under a long-time plane blast wave through experiments and numerical simulations. A simplified analysis method is proposed based on the simulation results. The reliability of the method is confirmed.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Mechanics
Shanyouming Sun, Dan Liu, Yinglong Sheng, Shangsheng Feng, Hongbin Zhu, Tian Jian Lu
Summary: The introduction of the new N-core structure has addressed the contradiction between the thermal and mechanical properties of sandwich panel cores, resulting in excellent performance. Experimental results show that, under the same mass, the load-bearing capacity of the hybrid core and corrugated core is superior to the web core, while both the hybrid core and web core outperform the corrugated core in terms of active cooling capability.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Pan Zhang, Daihui Mo, Xinxin Ge, Hao Wang, Changzai Zhang, Yuansheng Cheng, Jun Liu
Summary: This paper investigates the effect of foam filling on the performance of sandwich panels under combined blast and fragments loading. The experimental results show that increasing the stand-off distance can alleviate perforation failure, increasing the foam filler density can reduce permanent deformation of the panels, and foam filling can relieve debonding failure between the face sheet and core webs.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Ceramics
Tengfei Chen, Su Cheng, Laizhen Jin, Tengteng Xu, Tao Zeng
Summary: A novel lightweight C/SiC corrugated core sandwich panel with excellent compressive and three-point bending performance, high strength and low density was proposed and fabricated. The compressive strength was as high as 15.1 MPa and the density of the prepared panel was only 52.3% of the bulk C/SiC, indicating the realization of lightweight characteristic. The numerical simulations of stress distribution matched well with the experimental results under compression and three-point bending.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Zhang DuJiang, Zhao ZhenYu, Du ShaoFeng, Chen WeiJie, Yang Fan, Ni ChangYe, Yang ZhiKun, Lu TianJian
Summary: A novel ultralight all-metallic sandwich panel with 3D tube cellular cores was proposed as a protective system for vehicle underbodies. Experimental measurements and numerical simulations were conducted to study its performance under explosion attacks, and an optimal design of the 3D tube cellular core was carried out.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Chemistry, Physical
Longlong Ren, Haosen Yang, Lei Liu, Chuanlong Zhai, Yuepeng Song
Summary: This paper presents a numerical and experimental study on the vibro-acoustic optimization of sandwich panels with corrugated core for maximizing the sound transmission loss, showing improvements in sound insulation performance across different frequency ranges. By introducing the coefficient of determination, the correlation between structural design parameters and sound transmission characteristics is analyzed, providing insights into the importance of each design parameter in various frequency ranges.
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
Polymer Science
Ali Farokhi Nejad, Seyed Saeid Rahimian Koloor, Syed Mohd Saiful Azwan Syed Hamzah, Mohd Yazid Yahya
Summary: This study focuses on the mechanical behaviour of through-thickness polymer, pin-reinforced foam core sandwich panels subjected to indentation and low impact loading. Results show that using polymeric pins significantly increases the flexural strength of the panel under impact loading and raises the impact resistance of the pin-reinforced foam core panel. The size of pins has a significant influence on flexural behavior while the sample is under a moderate strain rate.
Article
Engineering, Mechanical
Shivdayal Patel, Murlidhar Patel
Summary: A novel hybrid composite honeycomb sandwich structure and metallic honeycomb sandwich structure were developed to consider blast loading. Finite element analysis and progressive damage modeling showed that the hybrid composite honeycomb sandwich structure had better blast resistance than the metallic honeycomb sandwich structure.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Engineering, Marine
Chunhao Jiang, Lin Lin, Nian-Zhong Chen
Summary: A novel type of side structure for enhancing the crashworthiness of double-hull vessels is proposed based on auxetic materials. Numerical simulation demonstrates the resistance to collision of three different unit cells. A comparative study shows that the proposed side structures have superior energy absorption and collision resistance compared to traditional side structures.
Article
Engineering, Marine
Lihua Xu, Jiasong Wang, Michael S. Triantafyllou, Dixia Fan
Summary: This paper presents a data assimilation method based on the POD-DeepONet structure to fuse two types of fidelity data from vortex-induced vibration (VIV) problems. The POD-DeepONet structure provides better accuracy and more stable predictions for amplitude response, successfully capturing the changing trend with the oncoming flow speed. The exponentially fitted MSE formula allows for quick determination of the required case number under the expected error.
Article
Engineering, Marine
Ilias Gavriilidis, Aris G. Stamou, Christos Palagas, Efthimios Dourdounis, Nikos Voudouris, Athanasios Tazedakis, Spyros A. Karamanos
Summary: This study investigated the collapse resistance of thick-walled steel pipes fabricated with the JCO-E process for deep offshore applications. It conducted a comprehensive analysis using experimental, numerical, and analytical approaches to examine the effects of heat treatment on the collapse behavior of two JCO-E pipes. The results were compared with the predictions of the DNV-ST-F101 standard, and the fabrication factor afa was discussed. The study also explored the impact of yield strength recovery due to heat treatment on the collapse of pipes with different D/t ratios.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study evaluates the effects of tsunami waves on the global performance of a spread-moored Floating Storage Unit (FSU) through tsunami-floater-mooring coupled dynamics simulations. The results show that larger tsunami heights and relatively short durations result in significantly increased motions and mooring tensions of the FSU.
Article
Engineering, Marine
Ling Zhu, Zhihui Zhou, Preben Terndrup Pedersen
Summary: Ship grounding experiments are crucial for validating numerical analysis and theoretical formulations. In this study, small-scale ship model grounding tests on a sharp rock were conducted in a water tank to observe and record different damage modes, ship bottom plate damage extents, and ship motion. The test results were used to analyze the energy dissipation process and the influence of initial conditions on ship response and damage.
Article
Engineering, Marine
Zhiping Zheng, Yanlin Shao, Jikang Chen
Summary: This study investigates the effect of horizontal low-frequency (LF) displacements and velocities on the responses of floating structures in irregular waves, focusing on a deep-draft spar buoy. The study finds that incorporating LF displacements and velocities in the seakeeping analysis is essential for reducing surge and pitch responses. The standard deviations of LF surge and pitch motions scale with significant wave height, highlighting viscous damping as the dominating damping mechanism.
Article
Engineering, Marine
Birendra Chaudhary, Hewenxuan Li, Akongnwi Nfor Ngwa, Helio Matos
Summary: This study investigates the long-term performance and effectiveness of coating systems for 3D-printed pressure vessels subjected to accelerated aging. The results show that the application of polyurethane coating systems significantly slows the degradation process, reducing critical operational depth and increasing pressure differential. This research contributes important insights into enhancing the longevity and performance of 3D-printed pressure vessels through coating systems.
Article
Engineering, Marine
Yuelin Song, Qin Dong, Jiping Zhang, Guoqiang Li, Dongfang Xu, Ping Yang
Summary: The objective of this research is to study the characteristics of low-cycle fatigue crack propagation from the perspective of accumulative plastic damage and propose a reliable prediction model for crack growth in EH-36 steel under high stress levels. Experimental findings demonstrate that increasing the mean stress and stress amplitude accelerates the progression of fatigue damage.
Article
Engineering, Marine
Hao Ding, Bo Huang, Liang Cheng, Ke Li, Qingyang Ren
Summary: This study investigates the dynamic response and cable forces of a submerged floating tunnel (SFT) under wave and wave-current interactions. Experimental results show that wave height, current velocity, and ratio of wavelength to structure size are important factors affecting the dynamic response of SFT and cable forces. The multi-anchor cable arrangement used in the experiments distributes cable forces more effectively and reduces potential safety hazards caused by cable breakage.
Article
Engineering, Marine
Baoshun Zhou, Zhixun Yang, Mostafa Amini-Afshar, Yanlin Shao, Harry B. Bingham
Summary: In the hydroelastic analysis of large floating structures, accurate prediction of response relies on the structural stiffness. However, obtaining exact structural stiffness is challenging due to the complexity of modern ship structures. This study proposes an efficient analysis technique that combines finite element and finite difference methods to calculate structural stiffness and solve hydrodynamic problems.
Article
Engineering, Marine
Xinwei Chen, Yang Yu, Lei Wang
Summary: This study introduces a framework to evaluate and compare scour prediction models, focusing on design robustness. By applying this framework, the study recommends the most favorable scour prediction model and optimal design for monopiles in OWTs.
Article
Engineering, Marine
Yu Lei, Wei Li, Xiang Yuan Zheng, Huadong Zheng, Shan Gao, Shengxiao Zhao
Summary: This paper compares the numerical results of a floating offshore wind turbine integrated with a steel fish farming cage (FOWT-SFFC) against experimental data. The study shows that the simulated responses are in good agreement with the experimental data and reveals the important influence of second-order wave forces on the simulation results.
Article
Engineering, Marine
Chenyu Luan, Torgeir Moan, Knut Andreas Kvale, Zhengshun Cheng
Summary: This paper deals with the study of the shear lag effect on the bending moment distribution in pontoon-type floating bridges. Comparative and parametric studies are carried out using beam and linear shell models to analyze the influence of shear lag on the bending stiffness and eigenmode shapes of the bridges. The study shows that elementary beam models may inaccurately predict the bending moments in bridges with large width and short span lengths, and a practical method is proposed to determine when caution is needed in using these models. The paper also highlights the complex boundary conditions near the bank abutment and the significant influence of shear lag on the bending moments in this region.
Article
Engineering, Marine
Akira Tatsumi, Yuji Kageyama
Summary: This study proposes a methodology to quantify the uncertainty of the ultimate strength of stiffened panels in steel ships and offshore structures due to the welding initial deflection. A statistical model of the initial deflection shape is developed based on measured data, and probability distributions of the ultimate strength are calculated using Monte Carlo simulation.
Article
Engineering, Marine
Zhenmian Li, Yang Yu, Xin Liu, Xiaowei Liu, Xiangyang Wang, Leige Xu, Jianxing Yu
Summary: This study evaluates the local collapses and propagating buckles of offshore pipelines under external overpressure, reverse fault displacements, and collapse failures. Different designs of integral arrestors are tested in a numerical model, and the effects of fault dip angles are investigated. The results show that integral arrestors are effective in preventing propagating buckles.
