Article
Mechanics
Sota Onodera, Koki Kawahara, Shigeki Yashiro
Summary: This study develops a ply-by-ply shell layer model to investigate the mechanical effects of gaps in composite laminates caused by the low position accuracy of the robot arm in automated fiber placement manufacturing. By modeling the gaps and hole independently of the mesh using XFEM and using a simple square mesh to reduce computational costs, this study achieves good prediction results.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Millan Kumar, Pramod Kumar, Shailendra Singh Bhadauria
Summary: In this study, the key parameters of cohesive zone modeling that significantly affect the accuracy in delamination problems were examined. The results showed that the shape and strength of the interface law have a substantial impact on buckling delamination.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Chongcong Tao, Chao Zhang, Hongli Ji, Jinhao Qiu
Summary: A novel method for predicting the probability of delamination in fiber reinforced composites is proposed in this study, utilizing fatigue cohesive elements to model delamination propagation under cyclic loadings. The method uses a non-local algorithm for delamination path tracing and a local mean and standard deviation correction scheme to compensate for uncertainty information mismatch caused by discretization.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Composites
Jingjing Liu, Liqing Wang, Yuqing He, Yanmei Zhang, Xiaowei Yuan, WeiGuo Li
Summary: This study investigates the tensile behaviors of carbon fiber reinforced polymer laminates under low temperature and large open-hole conditions. The results show that large open-hole significantly decreases the strength of laminates, while low temperature enhances the strength of laminates with small open holes.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Yu Gong, Linfei Jiang, Linkang Li, Sue Ren, Youxuan Zhao, Ziming Wang, Ning Hu
Summary: In this study, the effects of temperature on mode I delamination behaviors were investigated. It was found that temperature has a significant impact on fracture toughness, bridging stress, and failure mechanism. More bridging fibers were observed at higher temperatures, resulting in a significant increase in fracture resistance. A numerical framework based on the cohesive zone model was established for delamination modeling, and good agreement with experimental results was achieved.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Chen Fu, Xi Wang
Summary: This study proposes a novel three-linear cohesive zone model superposed by two bilinear laws for modeling mixed-mode delamination with large scale fiber bridging. A new method to determine bridging strength by applying varied values in different regions of the prearranged delamination path is developed, based on the concept of fracture process zone (FPZ) length. Simulation results show good agreement between predicted load-displacement responses and experimental results, validating the efficiency of the established CZM and bridging strength determination method in predicting delamination behaviors under both pure mode and mixed-mode loadings.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Xuebei Teng, Yingjie Xu, Weihong Zhang, Weiwei Liu, Mingxin Yin
Summary: In this study, the resistance of delamination in curved carbon fiber/epoxy composite laminates reinforced by z-pins was experimentally investigated. A cost-effective pre-hole z-pinning technique was applied to mitigate initial in-plane damage, and the effect of z-pin volume fraction and diameter on interlaminar fracture toughness and bridging behavior was evaluated through double cantilever beam testing. The mode-mixity of z-pin was determined, and the fracture toughness of curved specimens was calculated based on Timoshenko curved beam theory. The results showed that the mode-mixity varied depending on the location of z-pins, and z-pins experienced a combination of crack opening and crack sliding loads during the tests. The primary failure mode of z-pins was pull-out, with a minor portion experiencing fracture. The fracture toughness of specimens with 0.8 vol% z-pins was significantly higher compared to unpinned specimens, indicating the delamination resistance capacity of z-pins was influenced by the mixed-mode ratio.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Amin Farrokhabadi, Sara Neyestani, Davood Akbari, Reza Sarkhosh
Summary: The study found that using Glass-Kevlar-Epoxy hybrid laminate can enhance stiffness and delamination growth capacity in composite laminates. Experimental and numerical results show that hybridization and staking sequences have an impact on induced delamination growth.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Optics
Yu Yang, Wangfan Zhou, Zhaopeng Tong, Lan Chen, Xudong Ren
Summary: This study investigated the delamination behavior of Ti-CF FMLs under laser shock peening (LSP) using experimental and numerical methods, revealing that LSP can reduce the scalar stiffness of the interface between layers and induce delamination. Reducing the laser spot size effectively prevents damage to the adhesive layer in Ti-CF FMLs.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Paulius Griskevicius, Kestutis Spakauskas, Swarup Mahato, Valdas Grigaliunas, Renaldas Raisutis, Darius Eidukynas, Dariusz M. Perkowski, Andrius Vilkauskas
Summary: The integrity of delaminated composite structures can be restored through thermally-based healing effect. Heating the delaminated composite plates above their glass transition temperature can enable them to regain their properties. Experimental and numerical simulations demonstrate that thermal healing partially restores the mechanical properties of damaged laminate plates.
Review
Polymer Science
Biltu Mahato, Stepan V. Lomov, Aleksei Shiverskii, Mohammad Owais, Sergey G. Abaimov
Summary: This paper provides an overview of the application of nanofiber polymeric veils as toughening interleaves in fiber-reinforced composite laminates. It presents a comparative analysis and summary of attainable fracture toughness improvements based on electrospun veil materials. The toughening mechanisms introduced by polymeric veils are identified, listed, and analyzed, and the numerical modeling of failure in Mode I and Mode II delamination is discussed.
Article
Mechanics
Z. Z. Wang, J. Zhao, X. Ma, S. J. Wang, X. Yang
Summary: A new progressive interlaminar damage model was proposed to predict delamination in layered composites, showing accurate predictions of mechanical behavior compared to experimental data. The model was found to provide more accurate results than the Abaqus built-in model.
MECHANICS OF COMPOSITE MATERIALS
(2021)
Article
Mechanics
Tamer Tahir Ata, Demirkan Coker
Summary: The dynamic failure of a 30-ply curved unidirectional CFRP laminate under quasi-static moment/axial combined loading was numerically investigated. Dynamic delamination initiated at the maximum radial stress location, with crack propagation observed to be intersonic in the arm regions.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Lei Zhang, Zeyang Li, Hanyu Zhang, Zhao Liu, Ping Zhu
Summary: This paper proposes a novel micromechanical fatigue model for precisely explaining the fatigue failure mechanism and predicting the fatigue life of SFRP composites. Through numerical analysis and experimental verification, the results show that the progressive fatigue damage of each constituent can be quantitatively analyzed, and the S-N data of SFRP can be well predicted, which can improve the durability of SFRP components.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Congzhe Wang, Anastasios P. Vassilopoulos, Thomas Keller
Summary: This study numerically investigated the two-dimensional delamination growth in FRP laminates under Mode I loading condition using finite element analyses. The results showed that flatter pre-crack or loading zone shapes could result in higher initial structural stiffness and less uniform distribution of the strain energy release rate along the pre-crack perimeter. The final crack shape was dependent on the loading zone shape and area, but the effects were relatively weak.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Energy & Fuels
Ziteng Huang, Ran Li, Zhangxin Chen
Summary: Steam-assisted gravity drainage (SAGD) is a widely used thermal recovery process in oil sands production. The traditional numerical simulation process for SAGD prediction is time-consuming and computationally expensive. This study proposes a data-driven model-based workflow that utilizes machine learning algorithms to predict future SAGD production performance based on historical production data and operational conditions. Comparison of different algorithms reveals that the GRU-based model has the best predictive ability.
Article
Energy & Fuels
Xinfeng Jia, Qingyuan Zhu, Kangkang Wang, Binhai Jiao, Erpeng Guo, Tailai Qu, Keliu Wu, Zhangxin Chen
Summary: Cyclic solvent injection (CSI) is a promising and environmentally friendly process for heavy oil production, utilizing foamy-oil flow as one of its main recovery mechanisms. This study experimentally observes and theoretically models the foamy-oil flow under reservoir conditions, and investigates the oil recovery mechanisms of CSI. The results show that foamy oil flows intermittently during the production period, with multiple waves starting from the transition zone. Factors such as diffusivity, initial solvent content, pressure depletion rate, and formation rate of free gas influence the occurrence of foamy-oil flow and the overall oil production.
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Geochemistry & Geophysics
Xiaocai Shan, Zhangxin Chen, Boye Fu, Wang Zhang, Jing Li, Keliu Wu
Summary: We introduce a novel deep spatial-sequential graph convolutional network (SSGCN) for predicting total organic carbon (TOC) by leveraging cross-log topological association features and log-specific sequential features, outperforming existing methods. In the southeast Sichuan Basin, SSGCN shows better cross-validation performance and generalizability. Our SSGCN method can predict TOC with an R-2 value of 0.87 within 1 second, increasing efficiency in obtaining TOC parameter. We recommend using graph and sequential convolutions in well-log analysis deep learning architectures.
Article
Computer Science, Interdisciplinary Applications
Chaojie Di, Kun Wang, Yizheng Wei, Lihua Shen, Zhangxin Chen
Summary: Stability analysis is the standard method for testing phase appearance in compositional reservoir simulation. To reduce computational time, the neighborhood bypassing (NB) method and the shadow region bypassing (SB) method are proposed, and a hybrid bypassing (HB) method is presented. Experimental results show that the HB method performs better than the SB method and better than or equally to the NB method in most cases. Based on the performance of these methods, recommendations are given for their use in specific conditions.
COMPUTATIONAL GEOSCIENCES
(2023)
Review
Energy & Fuels
Zhengbin Wu, Hanzhao Chen, Xidong Cai, Qiyang Gou, Liangliang Jiang, Kai Chen, Zhangxin Chen, Shu Jiang
Summary: In situ catalytic upgrading of heavy oil decomposes viscous heavy oil underground through complex chemical and physical reactions with the aid of a catalyst, allowing lighter components to flow to the surface. This technique is environmentally friendly as it reduces or eliminates the use of steam and is considered a promising method to decarbonize the oil industry.
Article
Thermodynamics
Gang Hui, Zhangxin Chen, Youjing Wang, Dongmei Zhang, Fei Gu
Summary: The controlling factors of unconventional shale productivity have not been well understood and this study aims to evaluate these factors using comprehensive datasets from 1182 core samples of key wells from the Duvernay shale in Alberta. By integrating reservoir parameters and shale productivity, a machine learning-based approach is used to identify the fundamental elements affecting shale productivity. The results show that factors such as production index, formation pressure, effective porosity, total organic carbon, gas saturation, and shale thickness contribute significantly to shale productivity.
Article
Energy & Fuels
Qiyang Gou, Shang Xu, Zhangxin Chen, Zhengbin Wu
Summary: The traditional characterization of shale oil reservoir pores is based on the classification of micro, meso, and macropores in shale gas reservoirs. However, the significant difference between oil and gas molecules results in poor applicability of this classification. This study proposes a new classification method for shale oil reservoirs, based on N2 adsorption, Soxhlet extraction, and programmed pyrolysis experiments. Compared to previous methods, this new approach reveals the correlation between shale oil attributes and pore spaces for the first time, providing more accurate evaluation results and significant implications for optimizing exploration strategies.
Article
Energy & Fuels
Gang Hui, Zhangxin Chen, Jun Yan, Muming Wang, Hai Wang, Dongmei Zhang, Fei Gu
Summary: The integrated experiment logging-based strategy is proposed to evaluate high-quality shale in the West Duvernay Shale Basin. Through core measurements and logging interpretations, the geographic distribution of high-quality shales is determined. Machine learning techniques are then used to quantify the relationships between shale productivity and reservoir characteristics and predict the spatial distribution of high-quality shales. The strategy reveals that the Duvernay shale consists of four sublayers, with the D2 and D3 sublayers considered high-quality.
Article
Chemistry, Physical
Xi Cheng, Bo Liu, Heng Zhao, Hongguang Zhang, Jiu Wang, Zhangkang Li, Bei Li, Zhangxin Chen, Jinguang Hu
Summary: This study designed a catalyst with a strong interfacial effect to efficiently photorefine lignocellulosic biomass, producing hydrogen and value-added chemicals. By optimizing the interfacial effect, the catalyst achieved high photocatalytic hydrogen production in the presence of different electron donors. This research demonstrates the potential of photorefining raw biomass through the design and optimization of catalysts.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Energy & Fuels
Tianru Song, Weiyao Zhu, Zhangxing Chen, Wujun Jin, Hongqing Song, Lin Fan, Ming Yue
Summary: This research proposes a random-forest-adaptive-domain-clustering (RF-ADC) model for generating unknown well logging curves in shale gas reservoirs. The results show that the proposed model performs well with lower prediction errors compared to other models. Furthermore, the GS and BIRCH methods are valuable in data decomposition and determining the optimal number of domains, providing insights into detailed reservoir recognition.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Pengfei Xie, Jiagen Hou, Dongping Duan, Yuanrong Yao, Wenze Yang, Yuming Liu, Dingding Zhao, Zhangxin Chen
Summary: This paper applied spectral decomposition and convolutional neural networks (CNN) in a genetic algorithm (GA) inversion to improve the resolution of marine seismic data and predict the distribution of sand bodies. By capturing the spatial structure present in the data, a high-resolution interpretation of sand bodies aligned with geological patterns was achieved.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Thermodynamics
Peng Deng, Zhangxin Chen, Xiaolong Peng, Jianfeng Wang, Suyang Zhu, Haoming Ma, Zhengbin Wu
Summary: This study focuses on the Dalaoba condensate underground gas storage (CUGS) in China and establishes a dynamic pseudo-component model. Results show that the dynamic pseudo-component model accurately represents the process of thermodynamic property changes during natural gas injection, and provides insights for stable and efficient natural gas storage and supply in CUGS.
Article
Thermodynamics
Weibing Tian, Keliu Wu, Yanling Gao, Jing Li, Zhangxin Chen, Wojciech Stanek
Summary: This study revealed the dynamic contact angle (DCA) effect on imbibition and its impact on enhanced oil recovery in tight reservoirs. The results showed that the DCA effect has four stages of influence on imbibition recovery with time and affects both imbibition velocity and recovery rate.
Article
Energy & Fuels
Fuhe Lin, Frank Cheng, Zhangxin Chen
Summary: Condensed water in natural gas transmission can lead to pipeline corrosion and rupture. Predicting the distribution of water film and flow characteristics is crucial for analyzing pipe elbow corrosion. In this study, a model is developed to predict water phase accumulation locations and corrosion extent. The model is validated and shows substantial agreement with previous studies. The simulation results indicate that water film is mainly distributed at the bottom, and the elbow front is more susceptible to corrosion.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)