Article
Engineering, Mechanical
Akar Dogan
Summary: This study investigates the effects of different core materials on the performance of sandwich composites, with Ayous wood showing higher perforation threshold and bending/compression strength compared to Balsa wood and PVC foam.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Dong-Jun Kwon, Jong-Hyun Kim, K. Lawrence DeVries, Joung-Man Park
Summary: This study investigated the optimal manufacturing conditions of epoxy foam to enhance the mechanical performance of carbon fiber reinforced plastic sandwich composites for vehicle parts. The study found that the foam cured at 60 degrees Celsius exhibited the most stable properties after thermal aging at 180 degrees Celsius. The performance of the sandwich composites was improved by optimizing the cell condition of the foam.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Mechanics
Yalcin Boztoprak, Merve Unal, Cagatay Ozada, Eslem Kuzu, Hakki Ozer, Furkan Ergin, Murat Yazici
Summary: The distinctive features of sound insulation structures are flexibility and porosity. A cellular flexible epoxy matrix material was created using a foaming agent, and hollow glass microspheres were added to increase sound wave refraction. Structures with different densities and voids were formed by adjusting the ratios of filling material and foaming agents. An aluminum honeycomb was used for protection and homogeneous distribution of sound waves. The effect of density differences on sound insulation values was analyzed, and the mechanical, thermal, electrical, and flammability properties of the sandwich structures were evaluated.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
L. S. Sutherland, C. Guedes Soares
Summary: The introduction of a thin cork layer improves the impact resistance of composite foam sandwich laminates, but careful design is required to avoid compromising initial damage resistance and bending strength.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
S. J. Amith Kumar, S. J. Ajith Kumar, Bharath K. Nagaraja
Summary: The study focuses on enhancing the thermal stability and fire resistance of polymeric foam core sandwich composites to reduce damages caused by temperature and fire. Experimental results show that phenolic syntactic foam core has better thermal stability than glass/epoxy face skins up to 450 degrees Celsius, aiding in flame isolation.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Engineering, Mechanical
Alejandra G. Castellanos, Pavana Prabhakar
Summary: Recent interest in Arctic exploration has raised new challenges regarding the mechanical behavior of lightweight materials for offshore structures. The study found that low temperatures significantly affect the dynamic impact behavior of sandwich composites, rendering them stiff and brittle, leading to increased damage and more pronounced damage modes.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Prajakta Katti, K. K. Verma, S. Kumar, Suryasarathi Bose
Summary: The key to superior structural properties in polymer nanocomposites lies in the improved dispersion and enhanced interfacial adhesion of the reinforcement. By grafting epoxy chains directly onto graphene oxide, the mechanical properties of epoxy composites were significantly enhanced with just a small amount of graphene oxide.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Multidisciplinary
Atif Javaid, Shahbano Hashmi
Summary: The flame retardancy and mechanical properties of novel ultra-lightweight truss core-based structures with varying ammonium polyphosphate (APP) content were explored. The results showed that the formulation with 10% APP achieved good flame retardancy and mechanical properties. These fabricated sandwich composites have the potential for use in civil infrastructures and marine industries.
Article
Materials Science, Composites
Yongan Wang, Wei Shen, Lifeng Chen, Lvtao Zhu, Toshiaki Natsuki
Summary: Short carbon fiber (SCF) was used to enhance the interlaminar fracture toughness and flexural properties of carbon fiber reinforced epoxy resin (CF/EP) composites. The addition of 10 g/m(2) SCF increased the interlaminar fracture toughness by approximately 32.46%. Meanwhile, the best performance in terms of flexural strength and flexural modulus was achieved when the SCF content was 5 g/m(2), with increases of 36.92% and 98.48%, respectively. SEM images revealed the debonding, pulling out, and fracture of SCF, providing insight into the toughening mechanism. Comparison with previous studies on short aramid fiber interlaminar toughened CF/EP composites was conducted to analyze the impact of different short fibers on interlaminar toughening, which can guide the selection of toughening materials.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Atif Javaid, Hafiz Tanveer Ashraf, Muhammad Mustaghees, Arslan Khalid
Summary: This study investigates the fire-retardant performance of lightweight sandwich composites with modified epoxy impregnated carbon and glass fabric reinforcements and an aluminum honeycomb core. It demonstrates improved fire-retardant properties through phosphoric acid treatment of carbon fiber reinforcements and impregnation of epoxy with ammonium polyphosphate (APP) additive. The laboratory aging behavior and mechanical properties of the composites are evaluated to determine the panels' degradation resistance and strength under extreme conditions.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Composites
Limin Bao, Chuanfang Xie, Jian Shi, Yoshihiko Teramoto
Summary: Sandwich-structure materials consist of a high-strength skin material and a lightweight core material, offering excellent mechanical properties and low weight advantages. However, soft-core materials with low rigidity may not perform adequately in sandwich structures. This research aimed to reduce environmental impact and promote sustainable development by developing high-strength carbon foam and enhancing its mechanical properties.
POLYMER COMPOSITES
(2021)
Article
Engineering, Mechanical
Cecil Joseph, Chandrasekar Muthukumar, Lin Feng Ng, Jeyanthi Subramanian, Chinnasamy Ramesh, Senthilkumar Krishnasamy, Senthil Muthu Kumar Thiagamani
Summary: It has been found that incorporating nanoclay into the foam-based sandwich panel can enhance its properties. In this study, nanoclay was dispersed into the epoxy adhesive to bond the facesheet with the core. The results showed that the infusion of nanoclay led to an increase in bending strength, core shear strength, energy absorption, and sound absorption coefficient of the sandwich panel.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Polymer Science
Wei Min, Liangliang Qi, Xinxing Zhao, Jie Xiao, YuJia Wan, Muhuo Yu, Zeyu Sun
Summary: Thermal expansion molding process (TEMP) was used to prepare foam sandwich composites with different expansion ratios using epoxy foam prepreg. The study analyzed the properties of expandable foam and determined three suitable expansion ratios based on density, bubble sizes, compressive strength, and expansion pressures. The research also investigated the failure modes and material performance during stretching. The feasibility of TEMP technology in forming sandwich composites was confirmed through the preparation of PMI/M-1 foam hybrid sandwich composites with three structures.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Composites
Wen-yan Wang, Xiao Ma, Jing-hui Yang, Xiao-dong Qi, Yan-zhou Lei, Yong Wang
Summary: This study proposed an efficient method to construct thermal conductive paths in epoxy composites at extremely low filler content, achieving enhanced thermal conductivity and fracture toughness simultaneously. By coating PVP-modified carbon nanofibers on the 3D framework surface of melamine foam, the composites exhibited improved comprehensive properties with significantly enhanced thermal conductivity and fracture toughness.
COMPOSITES COMMUNICATIONS
(2021)
Article
Materials Science, Composites
Selwyn Jebadurai Devaraj, Arul Jeya Kumar Arputham
Summary: In this study, the interfacial bonding between face sheets and core in sandwich composites was strengthened by introducing chopped fibers. The sandwich specimens with chopped glass fibers showed improved mechanical properties, with significantly increased flexural and compressive strength.
POLYMER COMPOSITES
(2022)
Article
Engineering, Chemical
Jiawen Zheng, Weidong He, Yinghe Guo, Ruiqing Shen, Jingxian Liu
Summary: This study investigates the effects of purified tourmaline (TM) samples of three sizes on air filters, taking into account its unique spontaneous polarization. The results reveal that an electrode from 0.074 mm separated TM exhibits superior performance. Furthermore, when three types of TM powders with the highest B2O3% content are adhered to the filters, Elbaite 0.074 mm with 9.34% B2O3 content demonstrates optimal filtration efficiency with a slight increase in pressure drop. The crystal structure is refined using the Rietveld method based on X-ray diffraction patterns of the samples, and the electrostatic adsorption caused by TM spontaneous polarization enhances the filtration property of the filter materials.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Endocrinology & Metabolism
Rui Fu, Kongyong Cui, Jingang Yang, Haiyan Xu, Dong Yin, Weihua Song, Hongjian Wang, Chenggang Zhu, Lei Feng, Zhifang Wang, Qingsheng Wang, Ye Lu, Kefei Dou, Yuejin Yang
Summary: This study aimed to evaluate the predictive value of fasting stress hyperglycemia ratio (SHR) for in-hospital mortality in patients with acute myocardial infarction (AMI) under different glucose metabolism status. The results showed a strong positive association between high SHR values and in-hospital mortality regardless of diabetes status. Fasting SHR can be considered as a useful marker for risk stratification in AMI patients.
DIABETES RESEARCH AND CLINICAL PRACTICE
(2023)
Article
Hospitality, Leisure, Sport & Tourism
Xiuxia Li, Qingsheng Wang, Yucheng Hu, Linhai Jing, Wenyan Ge
Summary: In this study, the climate comfort level for tourism on the Tibetan Plateau was assessed using ERA-5 reanalysis data from 1979 to 2020. The tourism climate index (TCI) was calculated and showed increasing trends in both annual and monthly TCI. Spatially, higher TCI values and more significant increasing trends were found in the eastern, southern, and peripheral regions of the Tibetan Plateau, as well as in the Qaidam Basin with lower altitude. These findings provide valuable guidance for tourism development in response to climate change.
CURRENT ISSUES IN TOURISM
(2023)
Article
Green & Sustainable Science & Technology
Chao Lv, Guodong Li, Ruiqing Shen, Rui Shu, Mian Zhu, Zhenhui Yu, Jingxian Liu
Summary: Efficient removal of fly ash from flue gases is crucial for environmental protection. This study investigated bipolar-charged particle agglomeration for enhanced fly ash capture using a hybrid electrostatic filter. Optimal agglomeration conditions were identified for coal-fired fly ash particles. The results showed that bipolar-charged particle agglomeration significantly increased the collection efficiency of the fibrous filter and reduced pressure drop.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Engineering, Chemical
Yufeng Quan, Trent F. Parker, Yinying Hua, Hae-Kwon Jeong, Qingsheng Wang
Summary: Metal-organic frameworks (MOFs) have gained increasing attention in various fields such as catalysis, separation, environment, food, and medicine. Guidelines for efficient and safe scale-up synthesis of MOFs are crucial for the industry. This study focuses on the scale-up synthesis of zeolitic imidazolate framework-8 (ZIF-8) using a solvothermal RC1e reactor and in situ Fourier transform infrared spectroscopy. Through detailed process kinetics and hazard analysis, the formation stages and transformation kinetics of ZIF-8 are identified, and potential operability problems are discussed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Applied
Chao Lv, Ruiqing Shen, Yang Yang, Rui Shu, Guodong Li, Jingxian Liu
Summary: In this study, a PPS fiber/PTFE emulsion (PPS/PTFE) composite needle felt was fabricated by a direct impregnation process. The pressure drop characteristic and mechanical collection efficiency of PPS needle felt and PPS/PTFE composite needle felt were comprehensively evaluated. Three emulsion impregnation coating distribution models were inferred to systematically explain the experimental phenomenon. Additionally, the thermal degradation process of PPS needle felt and PPS/PTFE composite needle felt was analyzed, and several typical pyrolysis kinetic parameters were also determined theoretically. The results showed that PTFE emulsion impregnation coatings can enhance the thermal stability of PPS needle felts, providing new insight into the rational application of the direct impregnation process and emulsion impregnation coating in the industrial filtration field.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Construction & Building Technology
Zhihong Pang, Xing Lu, Pingfan Hu, Zheng O'Neill, Qingsheng Wang
Summary: This study develops and evaluates a smart ventilation control algorithm (SIREN) that dynamically adjusts zone and system-level HVAC operation to maintain an acceptable COVID-19 infection risk and HVAC energy efficiency.
JOURNAL OF BUILDING PERFORMANCE SIMULATION
(2023)
Article
Engineering, Chemical
Rong Ma, Ruiqing Shen, Yufeng Quan, Qingsheng Wang
Summary: Graphene quantum dots were decorated onto montmorillonite to create nanohybrids, which were then incorporated into a polystyrene matrix. The resulting nanocomposites showed enhanced interfacial interaction and improved flame retardancy. This study proposes a novel method to modify montmorillonite and produce well-dispersed polymeric materials with enhanced fire safety.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Engineering, Chemical
Chi-Yang Li, Jazmine Aiya D. Marquez, Pingfan Hu, Qingsheng Wang
Summary: Carbon Capture, Utilization, and Storage (CCUS) is an emerging industry that aims to address climate change. The construction of more pipelines for transporting CO2 to storage sites is a key aspect of this industry. Evaluating the behavior of CO2 release and dispersion from these pipelines is necessary due to the potential hazards of high concentration exposure. Industrial-scale experiments have provided quantitative data, but conducting experiments for every possible scenario is impractical. Computational tools such as Computational Fluid Dynamics (CFD) and risk assessment methodologies such as Quantitative Risk Assessment (QRA) have been used to predict CO2 dispersion behavior and hazards. This review discusses the different experiments, CFD models, and risk assessments related to CO2 transport pipelines. The potential of using machine learning to improve the accuracy and efficiency of predicting CO2 dispersion behavior is also explored.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Materials Science, Multidisciplinary
Yufeng Quan, Ruiqing Shen, Christian Schweizer, Pradeep Parajuli, Zhuoran Zhang, Waruna Kulatilaka, Qingsheng Wang
Summary: The use of zeolitic imidazolate frameworks (ZIFs) can enhance the flame retardancy of polypropylene composites, reduce the release of toxic byproducts during combustion, and provide an environmentally friendly and cost-effective strategy to suppress potential fire hazards from synthetic polymers.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Marine
Dongdong Yang, Gaogeng Zhu, Xinhong Li, Qingsheng Wang, Guoming Chen
Summary: An integrated approach for assessing the consequences of chain accidents is proposed, taking into account human behavior. The approach incorporates risk-based and grid-based concepts to integrate adverse impacts, and is applied to a hypothetical chain accident involving a release and explosion of H2S-containing natural gas. The approach considers emergency evacuation by establishing a model for evacuation time and evaluates toxic impact by calculating cumulative H2S inhalation dose along each evacuation trajectory. Explosion impact is predicted by extracting maximum explosion overpressures at the real-time positions of victims. This systematic and efficient approach can aid in developing safety measures and improving contingency plans.
Article
Engineering, Environmental
Mitchell Huffman, Qingsheng Wang, Faisal Khan
Summary: As the human population grows, sustainable practices are necessary to protect the planet and preserve the standard of living. Frameworks like life cycle assessment and the triple bottom line provide approaches to quantify sustainability, but there is a need for additional considerations such as safety and interrelations between sustainability pillars. Existing sustainability metrics show inconsistencies in their results and imply the need for a comprehensive assessment that is interrelated and time dependent.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Wei Zhou, Gang Li, Haoran Zhao, Xiupeng Zhang, Jazmine Aiya D. Marquez, Qingsheng Wang
Summary: The explosion characteristics of runaway battery vented gas (BVG) were studied, and the effects of ambient temperature, turbulence conditions, and graphite dust were investigated. The temperature increase reduced the maximum explosion pressure of BVG, while turbulence had little effect on explosion pressure but significantly affected the rate of explosion pressure rise. Adding graphite dusts helped BVG reach the maximum explosion pressure at a lower volume concentration and reduced the time to reach the maximum pressure after ignition.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Jianpeng Wang, Xiaoyang Luan, Jiali Huo, Mingju Jing, Mitchell Huffman, Qingsheng Wang, Bin Zhang
Summary: Hydrogen has the potential for emissions-free energy production, making it a strategic opportunity for renewable energy storage. Safety issues related to high-pressure hydrogen incidents are a key factor limiting its development. This study uses a CFD model to investigate the characteristics of high-pressure hydrogen jet flames under different forms of barrier walls and hydrogen pressure. Results show that complex barrier walls can effectively block flames compared to vertical barriers. A 60-degree plate is the preferred choice based on flame shape and temperature analysis.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
