Article
Engineering, Manufacturing
B. A. Castricum, M. Fagerstroem, M. Ekh, F. Larsson, S. M. Mirkhalaf
Summary: A coupled multi-scale model is developed to predict the non-linear elasto-plastic behavior of short fiber reinforced composites. The model incorporates a micro-mechanical model based on a two-step orientation averaging approach at the microscopic level and a Finite Element model at the macroscopic level. The model shows good predictive capability and computational efficiency improvements.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Mechanics
Marcello Congro, Deane Roehl, Cristian Mejia
Summary: This paper introduces a new numerical model for simulating the mechanical behavior of cement composite materials at a mesoscale level, with a focus on the coupling of fiber and cementitious elements without considering fiber dispersion. Through simulations of direct tensile and bending tests, the results demonstrate the efficiency and robustness of the proposed model.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Su Yu, Jonathan S. Colton
Summary: The new open-hole compression test fixture for composite laminates offers higher testing accuracy and requires less material compared to existing fixtures, especially suitable for testing non-standard angle laminates.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Materials Science, Composites
Yanfei Yang, Tianpeng Ling, Sainan Xue, Yanchen Liu, Jinli Zhou
Summary: A simplified Finite Element model of UHMWPE fiber-reinforced composite panel was developed to capture detailed ballistic responses of fibers and matrix. By simulating laminate structure and reducing calculation cost, different ballistic responses of fibers and matrix in varied regions of the panel can be identified, which is beneficial for optimizing the structure of UHMWPE hard panel to improve ballistic performance and lightweight.
APPLIED COMPOSITE MATERIALS
(2022)
Article
Engineering, Civil
Haowen Hou, Wei Wang, Shiye Wang
Summary: This paper provides both continuum finite element (CFE) modeling and fiber-based modeling methods for the nonlinear cyclic analyses of double-skin composite walls (DSCWs). The models are validated by experimental results, achieving good agreement. Two modification methods for the enhancement of confining effect due to interactional constraints of concrete in continuous multi-cavities are proposed. The reliability of the RSMM parameters that control the buckling and fracture of steel fibers is verified.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Chao Hang, Hao Cui, Huifang Liu, Tao Suo
Summary: This study presents a micro/meso-scale analysis framework to investigate the deformation and failure of a 2.5D woven composite under tensile loading. It predicts the elasticity and strength of fiber bundles, considering the effects of fiber undulation and in-situ factors. The research also explores the influence of shear coupling coefficient in the failure criterion on the mechanical response.
COMPOSITE STRUCTURES
(2021)
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
Materials Science, Multidisciplinary
M. Shafayet Zamil, Duane P. Harland, Brian K. Fisher, Michael G. Davis, James R. Schwartz, Anja Geitmann
Summary: Research has shown that hair fiber growth is influenced by a variety of biological, biochemical, and biomechanical factors, with biomechanical factors playing a largely unknown role. A multiscale mechanical modeling approach revealed that biomechanical features such as follicle geometry and keratinization-mediated hardening are likely crucial in hair fiber protrusion. Fine tuning biomechanical parameters is proposed as a key strategy to ensure smooth hair growth.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Textiles
Mohammed Irfan Khan, Chitresh Nayak
Summary: The objective of this study is to replace metallic leaf springs in electric vehicles with sisal fiber-reinforced epoxy composites and improve their mechanical properties. The experiments show that the composite has tensile, flexural, and impact strengths of 65 MPa, 170 MPa, 13 MPa and 53 MPa, 148 MPa, 14 MPa, respectively. The thermal response and fractured surfaces of the composites have also been analyzed.
FIBERS AND POLYMERS
(2023)
Article
Engineering, Mechanical
S. M. Mirkhalaf, M. Ekh, F. Larsson, M. Fagerstroem, T. J. H. van Beurden
Summary: A new micro-mechanical model is proposed to predict the non-linear elasto-plastic behavior of short fiber reinforced composites. The model is based on a two-step Orientation Averaging method and can accommodate a wide range of micro-structural parameters. Comparisons to experiments and numerical simulations show that the model provides accurate predictions. Additionally, the model is computationally efficient and can be used in applications with different fiber orientations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Civil
Rui Wu, Rongqiao Xu, Guannan Wang
Summary: This paper proposes two new multilayer composite plate elements to model and analyze FRP-strengthened slabs, addressing challenges related to geometric irregularity and adhesive characteristics. The novelty lies in the macroscopic modeling of substrate, adhesive layer, and FRP sheet in one element, instead of separate modeling. The extension of the study from elastic to viscoelastic using a rheological interface is another novelty. The proposed elements prove to be accurate and computationally efficient in predicting the mechanical behavior of FRP-strengthened slabs, contributing to system design and optimization.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Do-Hyeon Jin, Min-Su Jang, Jae-Hun Choi, Woo-Hyeok Jang, Won-Ho Choi, Chun-Gon Kim
Summary: This study introduced a multi-slab hybrid radar absorbing structure with controllable permittivity short carbon fiber layers, which improved the design flexibility of RAS by absorbing electromagnetic waves in the target frequency bands.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Kailun Huang, Keyao Song, Xiang Zhou, Bin Ji, Hai Wang
Summary: Foldcore sandwich structures with kirigami-inspired folding pattern BCH have been studied for their mechanical properties using woven Kevlar fiber reinforced plastics (KFRP). The numerical and experimental results show that the BCH-based woven KFRP foldcores exhibit superior specific peak stress and stiffness under compression and shearing, with potential practical application.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Hongseok Jang, Segwan Seo, Daesung Cho
Summary: This study assessed the compressive and tensile strengths and modulus of elasticity of waste PET using ASTM standard tests. It found that waste PET has higher tensile strength and lower unit weight compared to concrete, making it a potential material for foundation piles, especially when short reinforcing fibers are used and UV degradation is avoided.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Kristina Berladir, Dmytro Zhyhylii, Oksana Gaponova, Jan Krmela, Vladimira Krmelova, Artem Artyukhov
Summary: In this study, the physical and mechanical properties of PTFE PCMs were experimentally determined and a finite element model was built to simulate their performance. The developed computer model was verified by comparing the results with experimental data, and it was found that the model can accurately predict the strength of chaotically reinforced spherical inclusions, but further analysis is required for cylindrical inclusions.
Article
Engineering, Electrical & Electronic
Won-Ho Choi, Byeong-Su Kwak, Young-Woo Nam
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Yeong-Hoon Noh, Jong-Gwan Yook, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Min-Su Jang, Jae-Hun Choi, Woo-Hyeok Jang, Young-Woo Nam, Chun-Gon Kim
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Manufacturing
Seong-Min Park, Rene Roy, Jin-Hwe Kweon, Youngwoo Nam
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2020)
Article
Engineering, Manufacturing
Won-Ho Choi, Hyeon-Seok Choe, Young-Woo Nam
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2020)
Article
Engineering, Multidisciplinary
Byeong-Su Kwak, Won-Ho Choi, Yeong-Hoon Noh, Gi-Won Jeong, Jong-Gwan Yook, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITES PART B-ENGINEERING
(2020)
Review
Materials Science, Composites
Van-Tho Hoang, Bo-Seong Kwon, Jung-Won Sung, Hyeon-Seok Choe, Se-Woon Oh, Sang-Min Lee, Jin-Hwe Kweon, Young-Woo Nam
Summary: Promising CF/PEKK composites were fabricated using Automated Fiber Placement. Mechanical properties, void content, and crystallinity were evaluated for four different postprocessing methods, with hot press yielding the best quality.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Mechanics
Min-Su Jang, Jae-Hun Choi, Woo-Hyeok Jang, Young-Woo Nam, Chun-Gon Kim
Summary: Recent studies have investigated the implementation of radar-absorbing structures by electrolessly plating metal on fibers in the form of dots. The mechanical properties of dot-type electroless plated composite materials were found to be insufficiently researched. The study showed that while the plating process decreased the tensile strength of single fibers, it improved the interfacial shear strength between the fibers and epoxy, leading to increased compressive and interlaminar shear strengths. This suggests that composites with dot-type electroless plating could be suitable for use in actual structures such as stealth aircraft.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Gi-Won Jeong, Yeong-Hoon Noh, Won-Ho Choi, Joon-Hyung Shin, Jin-Hwe Kweon, Jong-Gwan Yook, Young-Woo Nam
Summary: This study presents an electromagnetic-mechanical repair patch (EMRP) method to restore the mechanical and electromagnetic wave absorption performance of a radar-absorbing structure damaged by lightning strike. The method considers the need to maintain structural integrity and electrical continuity for high repair efficiency. Experimental results validate the feasibility of using the proposed EMRP method in repairing radar-absorbing structures.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Mechanics
Byeong-Su Kwak, Gi-Won Jeong, Won-Ho Choi, Young-Woo Nam
Summary: In this study, a broadband microwave-absorbing honeycomb core structure was designed and fabricated using a nickel-coated glass fabric, which showed good absorption properties within a specific frequency range and underwent mechanical testing. Due to its desirable radar-absorption and mechanical characteristics, the structure has significant potential for use in stealth technology applications.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Won-Ho Choi, Hyeon-Seok Choe, Young-Woo Nam
Summary: This study developed a multifunctional SHIMAC with microwave absorption and hypervelocity impact-shielding capabilities. Experimental results demonstrated that the SHIMAC has excellent microwave absorption performance and hypervelocity impact-shielding performance.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Boseong Kwon, Hyeonseok Choe, Jaehyeng Jeong, Hyunwoo Ju, Jin-Hwe Kweon, Young-Woo Nam
Summary: This paper investigates the mechanical properties of carbon fiber reinforced polyetherketoneketone (CF/PEKK) thermoplastic induction-welded composite joints, using finite element modeling and simulation to analyze temperature behavior and experimental results. Single-lap shear strength tests were conducted to check weld quality, revealing that optimal process parameters could potentially improve mechanical performance.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Boseong Kwon, Wonwoo Choi, Hyunwoo Ju, Jin-Hwe Kweon, Young-Woo Nam
Summary: This study investigated the consolidation process of radial-type braided carbon fiber reinforced polyetherketoneketone (CF/PEKK) thermoplastic composite tubes. Different consolidation processes were evaluated, and the OML-PTFE consolidation process showed a flat surface without wrinkles and low void content, making it suitable for manufacturing thermoplastic composite tubes for actual aircraft use. Other processes resulted in high void content, making them less appropriate.
FUNCTIONAL COMPOSITES AND STRUCTURES
(2021)