Article
Materials Science, Composites
Lei Zhang, Fangsen Cui, Bisma Mutiargo, Lin Ke, Zi Wen Tham, Yi Fan Chen, Chin Yaw Tan
Summary: This paper reports the use of acoustic shearography imaging for defect detection in carbon fiber composite materials. The experiment shows that acoustic shearography can efficiently image various defects and synchronize with the ultrasonic wave frequency to significantly improve the imaging quality. Comparison with X-ray computed tomography results indicates that acoustic shearography can provide sufficiently good defect imaging results with reduced imaging time.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Vistasp M. Karbhari, Guijun Xian, SoonKook Hong
Summary: The study investigated the thermo-oxidative resistance of a wet layup ambient cured carbonepoxy composite using dynamic scanning calorimetry, dynamic mechanical thermal analysis, and thermo-gravimetric analysis. Results showed that exposure to higher temperatures and longer periods of time led to deterioration of the thermal characteristics of the composite, while exposure at lower temperatures did not show degradation within the 72-hour period.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Composites
Eduardo Szpoganicz, Martin Demleitner, Fabian Huebner, Youngseok Oh, Youngdo Kweon, Hyojae Lee, Volker Altstaedt, Holger Ruckdaeschel
Summary: In this study, an empirical correlation between the tack of phenolic prepregs and the rheological state of the base resin was established through multivariable analyses. The interaction between resin and filler was found to effectively change the resin viscosity, regulating the prepreg tackiness level. By systematically varying the conversion state and operating temperature, inherent phenolic resin properties were thoroughly determined to understand their impact on final composite tack property.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
U. A. Khashaba
Summary: Fatigue tests were conducted on scarf adhesive joints (SAJs) with composite substrates to investigate the effects of Al2O3 nanoparticles on fatigue strength at different temperatures. Incorporation of Al2O3 nanoparticles improved fatigue strength and influenced the glass transition temperature. The U-p parameter was found to be the most suitable for predicting joint collapse.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Composites
Roberto Carlos Anaya-Ramirez, Carlos Rolando Rios-Soberanis, Pedro Jesus Herrera-Franco
Summary: In this experimental study, the micro-damage mechanisms of HDPE/surface modified henequen fiber reinforced composites were investigated in tensile quasi-static mode. The results showed that the chemical bonds interaction in the interface area had a significant effect on the mechanical properties of the composite. Chemically treated fiber composites exhibited higher total fracture work and improved mechanical properties.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Baoming Wang, Shengzong Ci, Mingzhe Zhou, Chengrui Di, Junwei Yu, Bo Zhu, Kun Qiao
Summary: In this study, the ageing mechanisms and moisture absorption behavior of epoxy resins and carbon fiber composites were investigated. The results showed that the ageing process primarily involved physical adsorption of water, which did not significantly affect the chemical structure and microstructure. The absorbed water caused micro-cracks at the fiber-resin interface, weakening the interfacial strength and reducing the mechanical properties of the composites.
Article
Engineering, Multidisciplinary
Jessica Passaro, Claudio Imparato, Dambarudhar Parida, Aurelio Bifulco, Francesco Branda, Antonio Aronne
Summary: The manufacturing of non-woven fibrous composites by electrospinning is being widely used in catalysis, adsorption, and water purification applications. In this study, silica nanoparticles and TiO2acac microparticles were synthesized and electrospun with PVP to obtain ternary composite mats. It was found that the addition of TiO2acac microparticles can enhance the performance of the composite mats, such as improving oxidative degradation activity and the removal efficiency of organic dyes.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Mechanics
Faisal H. Bhuiyan, Ray S. Fertig
Summary: The study developed a physics-based multiscale fatigue damage analysis methodology and applied it to fatigue damage prediction in composite materials, enabling damage analysis and prediction of laminates in different directions under tensile loading.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
V Fiore, L. Calabrese, R. Miranda, D. Badagliacco, C. Sanfilippo, D. Palamara, A. Valenza, E. Proverbio
Summary: The study revealed that flax fiber reinforced composites experienced a certain degree of recovery in marine environment, with their performance mainly influenced by reversible aging phenomena, while the recovery of flexural strength was particularly significant.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Polymer Science
Yuxi Shen, Alia Gallet-Pandelle, Hiroki Kurita, Fumio Narita
Summary: The study demonstrated that adding a surface-active agent and basalt fibers can significantly improve the mechanical properties of cellulose acetate composites, while the arrangement of fibers also affects this effect. Photodecomposition experiments showed that the photocatalyst also has a certain impact on the decomposition of materials.
Article
Mechanics
Liaojun Yao, Hao Cui, Licheng Guo, Yi Sun
Summary: A new total fatigue life model for delamination growth in composites has been proposed in this study, which can appropriately characterize the FDG behavior under various fatigue loading conditions. By obtaining master resistance curves, the FDG behavior under different R-ratios can be determined, with these curves shifting downwards with mode mixity changes.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Manufacturing
Mathew W. Joosten, Carlos G. Davila, Qingda Yang
Summary: A computationally efficient fatigue analysis methodology is proposed that can predict the initiation and propagation of cracks using a cycle jump approach and a unified local fatigue cohesive zone model. The results of verification and validation experiments indicate that this method can reproduce fatigue damage initiation and evolution for different configurations and load combinations.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Shuhang Liu, Yiting Guo, Jianwei Li, Sichen Wu, Jie Xu, Emilia Pawlikowska, Jie Kong, Artur Maciej Rydosz, Mikolaj Szafran, Feng Gao
Summary: Ceramic/polymer dielectric functional composites, specifically the (Ba0.6Sr0.4)TiO3/PEEK (BST/PEEK) composites, were prepared with high frequency stability of the dielectric constant and low dielectric loss via cold-pressing sintering. The optimal properties of the BST/PEEK composites were achieved at a BST concentration of 40 vol% and sintered at 360°C for 1 hour, showing a permittivity of 23, a loss of 0.0065, F(x) <5%, and a dielectric tunability of 11.9%. The study provides insight for developing new composites with low loss and high frequency stability.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
Danian Liu, Jingwen Wang, Wenhai Peng, Houqing Wang, Hua Ren
Summary: Researchers have designed an organic semiconductor material, polyethylene glycol-polyaniline multialternating block copolymer, to meet the demand for lightweight and flexibility in the development of aeronautics, astronautics, and wearable technology. This material has good processing performance and dispersion, and its alternating block structure provides a high dielectric constant.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Polymer Science
Ning Jiang, Ru Zhang, Yuankun Li, Ning Li, Lingbo Dong, Chaozhong Chen, Cao Tan
Summary: This study focuses on the effects of hydrothermal environment on the aging of all-steel radial tire (ASRT) composites. The results show that the mechanical properties of ASRT composites decrease due to the degradation of the rubber matrix and the poor interface between the steel fiber and rubber matrix during the hygrothermal aging process.
Article
Polymer Science
Yinghui Hu, Xiaochen Li, Augustus W. Lang, Yunpeng Zhang, Steven R. Nutt
POLYMER DEGRADATION AND STABILITY
(2016)
Article
Chemistry, Physical
Augustus W. Lang, James F. Ponder, Anna M. Osterholm, Nicole J. Kennard, Rayford H. Bulloch, John R. Reynolds
JOURNAL OF MATERIALS CHEMISTRY A
(2017)
Article
Chemistry, Multidisciplinary
Brian Schmatz, Zhibo Yuan, Augustus W. Lang, Jeff L. Hernandez, Elsa Reichmanis, John R. Reynolds
ACS CENTRAL SCIENCE
(2017)
Article
Chemistry, Multidisciplinary
Augustus W. Lang, Yuanyuan Li, Michel De Keersmaecker, D. Eric Shen, Anna M. Osterholm, Lars Berglund, John R. Reynolds
Article
Nanoscience & Nanotechnology
Michel De Keersmaecker, Augustus W. Lang, Anna M. Osterholm, John R. Reynolds
ACS APPLIED MATERIALS & INTERFACES
(2018)
Article
Chemistry, Multidisciplinary
Chinmay C. Satam, Cameron W. Irvin, Augustus W. Lang, Jerel Cedric R. Jallorina, Meisha L. Shofner, John R. Reynolds, J. Carson Meredith
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2018)
Article
Chemistry, Multidisciplinary
Augustus W. Lang, Anna M. Osterholm, John R. Reynolds
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Brian Schmatz, Augustus W. Lang, John R. Reynolds
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Chemistry, Multidisciplinary
Augustus W. Lang, Yue Ji, Anna C. Dillon, Chinmay C. Satam, J. Carson Meredith, John R. Reynolds
Summary: Polymer-based electrochromic devices (ECDs) face limitations due to photo-oxidative bleaching of active materials, but renewable barrier films made of cellulose and chitin show promise as an alternative. Photodegradation of the active layer proceeded at a similar rate for all encapsulated devices, suggesting the potential of replacing petroleum packaging with bioderived barriers. Further analysis revealed that both photochemical breakdown of the electrolyte and cross-linking of the active material are key factors affecting device performance when oxygen flux is restricted. Future research is proposed to better understand photodegradation and improve sustainability in ECD design.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
James F. Ponder, Shawn A. Gregory, Amalie Atassi, Akanksha K. Menon, Augustus W. Lang, Lisa R. Savagian, John R. Reynolds, Shannon K. Yee
Summary: The processability and electronic properties of conjugated polymers (CPs) are important for their potential applications in redox and solid-state devices. Side chains are typically added to CPs for solubility, but they can reduce the electrical conductivity and compromise the optoelectronic properties. In this study, the researchers demonstrate that removing the side chains after film formation can significantly increase the electrical conductivity of chemically doped CP films by increasing charge carrier density and reducing carrier localization. This method was applied to high-performance CPs, leading to exceptional electrical conductivities.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yue Ji, Samantha Waters, Eunhyang Lim, Augustus W. Lang, Peter N. Ciesielski, Meisha L. Shofner, John R. Reynolds, J. Carson Meredith
Summary: By adjusting the deacetylation conditions of chitin, nanowhiskers with different characteristics were prepared and spray-coated with cellulose nanocrystal suspensions onto cellulose acetate films to form a multilayer structure. The optimized film showed a significant decrease in oxygen permeability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Polymer Science
Tetsu Sato, Mariko Takahashi, Takeshi Saito, Masahito Toyonaga, Itsuo Tanuma, Rie Yamada, Satoru Hosoda
Summary: An automatic evaluation system for photooxidation has been developed and successfully applied to assess the photo-OIT of LDPE samples containing photooxidation stabilizers. The system allows independent setting of various measurement conditions and provides detailed information on the photooxidation process.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Zongzheng Zuo, Shuxue Zhou
Summary: In this study, three fluoroalkyl trimethoxysilane (FATMS) additives with different chain lengths were incorporated into a two-component polyurethane clearcoat to improve its hydrophobic durability. The coatings modified with FATMS maintained their surface hydrophobicity under various conditions, but quickly lost it when exposed to both UV irradiation and/or high temperature with water. The results suggest that the FATMS route is more suitable for indoor applications at room temperature.
POLYMER DEGRADATION AND STABILITY
(2024)
Article
Polymer Science
Song Li, Feng Zhao, Xueya Wang, Zhihua Liu, Jingze Guo, Yutong Li, Shuangmei Tan, Zhenxiang Xin, Shuai Zhao, Lin Li
Summary: Green flame retardants have garnered attention for their environmental friendliness, but current options fall short in achieving high flame retardancy for flammable polymers and maintaining environmental protection. This study takes a two-pronged approach to address flame retardants and the flame-retardant process. An eco-friendly bio-based synergistic flame retardant (PAU), synthesized using phytic acid (PA) and urea (U), is used to create a flame retardant coating that can be directly applied to any surface shape using polydopamine as an adhesive. The resulting EPS-PAU exhibits excellent flame retardancy, smoke suppression, and light weight while only slightly increasing the density.
POLYMER DEGRADATION AND STABILITY
(2024)
