Article
Mechanics
Ryoma Aoki, Ryo Higuchi, Tomohiro Yokozeki, Kazuyuki Aoki, Shigekazu Uchiyama, Toshio Ogasawara
Summary: Thin-ply technology offers more possibilities for composite structures, allowing for variations in ply thickness and laminate layup. This study investigated the effects of ply thickness and 0 degrees-layer ratio on the strength and damage behavior of thin-ply composite laminates, finding that thin-ply can reduce strength and a higher 0 degrees-layer ratio leads to increased strength with a transition to splitting-dominated failure. Additionally, finite element analysis indicated that fastener restraint can alleviate stress concentration, potentially impacting tensile strength.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
T. R. C. Chuaqui, M. W. D. Nielsen, J. Colton, R. Butler, A. T. Rhead
Summary: The strength of carbon-fibre reinforced plastic laminates under open-hole tension can be significantly affected by ply angle, ply blocking, and loading direction. Experimental and finite element analysis testing shows that matrix damage can both benefit and decrease strength, with a proposed numerical edge treatment resulting in up to 80% strength increases by suppressing edge failure in certain applications. These findings challenge the validity of standard open-hole tension testing and design rules.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Civil
Beibei Li, Yuanqing Wang, Ying Zhang, Huanxin Yuan, Xinhang Zhi, Charalampos C. Baniotopoulos
Summary: This paper investigates the mechanical performance of high-strength aluminium alloy hollow section beams through experiments and numerical analysis. The results show that the current design provisions are relatively conservative and the proposed continuous strength method can improve the resistance predictions effectively. It is concluded that all four design methods are feasible and safe for the design of 7A04-T6 high-strength aluminium alloy beams.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Evangelia Georgantzia, Michaela Gkantou, George S. Kamaris, Kunal D. Kansara
Summary: Over the last twenty years, 6000 series aluminium alloys have gained attention in the construction sector for their lightweight and corrosion resistance properties. However, plastic design of aluminium alloy structures is not widely permitted in current design codes. To address this knowledge gap, experimental and numerical studies were conducted on rectangular hollow sections made from a 6082-T6 aluminium alloy. The results demonstrate the potential of plastic design in aluminium alloy indeterminate structures, with the plastic hinge method and the Continuous Strength Method providing the most accurate design strength predictions.
Article
Engineering, Civil
Naoual Djafour, Soumia Kherbouche, Abdellatif Megnounif
Summary: This research aims to conduct a parametric study on built-up columns using the direct strength method, analyzing the effects of various parameters on the stability of the columns. The proposed approach was compared with current design standards and found to be slightly conservative for global buckling columns and non-conservative for local buckling mode columns.
Article
Engineering, Civil
Ali Raza, Abdellatif Selmi, Mohamed Hechmi El Ouni, Muhammad Arshad, Nabil Ben Kahla
Summary: The current research aims to determine the performance efficiency of the rapid repairing process of partially damaged GFRP-reinforced recycled aggregate geopolymer concrete (RGC) compressive members. Both experimental and numerical outcomes discovered that the proposed rapid repair method could considerably recover the peak axial capacity and axial shortening capacity of pre-damaged RGC compressive members.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Manufacturing
R. Higuchi, S. Warabi, A. Yoshimura, T. Nagashima, T. Yokozeki, T. Okabe
Summary: Progressive damages in open-hole compression tests of composite laminates were studied experimentally and numerically, revealing that kink-band failure is initiated and propagated by combined stress states of longitudinal compression and in-plane shear.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Civil
Beibei Li, Yuanqing Wang, Zhongxing Wang, Xinhang Zhi, Ying Zhang, Yuanwen Ouyang
Summary: This paper presents experimental and numerical investigations into the flexural behavior of 7A04-T6 high-strength aluminium alloy rectangular and square hollow section beams. The results showed that the predicted design resistances were generally conservative and the continuous strength method proved to be more accurate for predicting the moment capacity. The study provides valuable insights for the design of high-strength aluminium alloy beams.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Manufacturing
Kota Takamoto, Toshio Ogasawara, Hiroki Kodama, Tomoisa Mikami, Sota Oshima, Kazuyuki Aoki, Ryo Higuchi, Tomohiro Yokozeki
Summary: This study investigates the effects of layer thickness and stacking sequence on the open-hole compressive strength of thin-ply CFRP laminates through experiments and finite element analyses, demonstrating the effectiveness of the numerical model in predicting the strength.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Civil
Sanasam Vipej Devi, Konjengbam Darunkumar Singh
Summary: In this study, the continuous strength method was used for the analysis of torsion members, with numerical parametric studies and finite element analysis conducted to investigate different grades of steel. Results were obtained through CSM torsion design equations, showing that the CSM design equation provided more accurate and consistent predictions for different grades of steel compared to existing design guidelines.
ENGINEERING STRUCTURES
(2021)
Article
Construction & Building Technology
Dinesh Lakshmanan Chandramohan, Elilarasi Kanthasamy, Perampalam Gatheeshgar, Keerthan Poologanathan, Muhammadh Fareedh Muhammadh Ishqy, Thadshajini Suntharalingam, Thirunavukkarasu Kajaharan
Summary: This study investigates the shear behavior of CFS doubly symmetric Rectangular Hollow Flange Beams (RHFBs) with unreinforced circular web openings using Finite Element (FE) analysis. It is found that existing shear strength design equations are not suitable for RHFBs with circular web openings, and new Direct Strength Method (DSM) based shear design rules are proposed. The study provides valuable insights for improving the shear strength estimation of RHFBs with circular web openings.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Chemistry, Physical
Ganesh Radhakrishnan, Daniel Breaz, Sami Sulaiman Al Khusaibi, Amjad Juma Al Subaihi, Al Azhar Zahir Al Ismaili, AlSalt Malik AlMaani, Kadhavoor R. Karthikeyan
Summary: In recent times, hollow sections have been increasingly used in construction and machine applications due to their lightweight and high specific strength. This investigation focused on the flexural capability of aluminium hollow tubes with square cross-sections and studied the influence of stress concentration on their flexural behavior. Different stress concentrations, such as circular holes, multiple circular holes, square holes, and perforations, were considered. Three-point bending tests were conducted on specimens with various support spans, and the output measures analysed included maximum bending load, deflection, and flexural stiffness. The findings suggest that AHTs with circular holes, multiple circular holes, and perforations exhibit better flexural stability compared to other AHTs.
Article
Materials Science, Multidisciplinary
Tao Yuan, Shaoqian Kang, Xiaoqing Jiang, Pengjing Zhao
Summary: Refill friction stir processing (RFSP) method was used to repair exit-hole defect in 7475 aluminium alloy plate. The repaired joints showed successful refilling of the exit-hole, but had refill voids, annular grooves, and un-stirred material defects due to material flow. The maximum strength of the repaired joint reached 415 MPa, which was 105% of the base defect-free weld. The mechanical properties of the repaired joint were influenced by the stir zone (SZ) boundary and un-stirred material defects.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2023)
Article
Materials Science, Composites
Masahiro Arai, Toshiki Chiba, Keita Goto, Akinori Yoshimura
Summary: This study evaluated the interlaminar tensile strength of CFRP prepregs under different curing conditions and investigated the effects of adding a carbon nanofiller interlayer on fracture toughness. The results showed that dynamic interlaminar strength was higher than static strength, and samples cured at 130 degrees C had higher strength compared to those cured at 100 degrees C.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Andre Dias Martins, Dinar Camotim, Pedro Borges Dinis, Man-Tai Chen, Ben Young
Summary: This paper discusses a design approach to handle local-distortional interactive failures in cold-formed steel columns, based on the Direct Strength Method. The approach is developed, calibrated, and validated using experimental failure load data and numerical failure loads, and its reliability is assessed and compared with existing methodologies. The findings suggest that this design approach is ready for codification in the near future.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Jian Xue, Weiwei Zhang, Jing Wu, Chao Wang, Hongwei Ma
Summary: This study integrates a plate-type local resonator with varying free boundaries within a plate to convert the initial low-order global vibration modes into localized vibration modes. A novel semi-analytical method is proposed to analyze the free vibration of the plate with thickness and displacement discontinuities. The results show that by applying free boundary conditions, the low-order localized vibration frequencies can be significantly reduced without affecting the low-order global frequencies.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Merve Tunay
Summary: In recent years, there has been an increasing number of studies on the mechanical properties of sandwich structures manufactured with the Fused Deposition Modeling (FDM) method. However, there is still a lack of experimental data on the mechanical characteristics of FDM-manufactured sandwich structures under different thermal aging durations. In this experiment, the energy absorption capabilities of sandwich structures with different core geometries were investigated under various thermal aging durations. The results showed that the core topology significantly influenced the energy absorption abilities of the sandwich structures.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Zi-qin Jiang, Zi-yao Niu, Ai-Lin Zhang, Xue-chun Liu
Summary: This paper proposes a crosssection corrugated plate steel special-shaped column (CCSC) that improves the bearing capacity and overall stability of structural columns by using smaller material input. Through theoretical analysis and numerical simulation, the overall stability of the CCSC under axial compression is analyzed. The design method and suggestions for the stability of CCSC are put forward. Compared with conventional square steel tube columns, the CCSC has obvious advantages in overall stability and steel consumption.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yong Zhang, Yangang Chen, Jixiang Li, Jiacheng Wu, Liang Qian, Yuanqiang Tan, Kunyuan Li, Guoyao Zeng
Summary: A hybrid TPMS method was proposed to develop a new TPMS structure, and the mechanical properties of different TPMS structures were studied experimentally and numerically. Results showed that the hybrid TPMS structure had higher energy absorption and lower load-carrying capacity fluctuation. Further investigations revealed that the topological shape and material distribution had significant influence on mechanical properties, and the hybrid additive TPMS structure exhibited significant crashworthiness advantage in in-plane crushing condition.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Tongfei Sun, Ye Liu, Kaoshan Dai, Alfredo Camara, Yujie Lu, Lijie Wang
Summary: This paper presents a series of experimental and numerical studies on the performance of a novel double-stage coupling damper (DSCD). The effects of damper configuration, friction-yield ratio (Rfy), and loading protocol on the hysteresis performance of the DSCD are investigated. The test results demonstrate that the arrangement of ribs in the DSCD increases its energy dissipation capacity. Numerical analysis reveals that the length of the friction mechanism and the clearance between the yield segment and the restraining system affect the energy dissipation and stability of the damper.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Jeonghwa Lee, Young Jong Kang
Summary: This study investigates the local buckling behavior and strength of I-shape structural sections by considering flange-web interactions through three-dimensional finite element analysis. The study provides a more reasonable estimation of local buckling strength by considering the ratio of flange-web slenderness and height-to-width ratio, and presents design equations for flange local and web-bend buckling coefficients.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yizhe Chen, Wenfeng Xiang, Qingsong Zhang, Hui Wang, Lin Hua
Summary: This study investigates the surface modification of a nickel plate to improve the bonding strength with carbon fiber-reinforced plastics (CFRP). The results show that different surface modification methods, including sandblasting, coupling agent treatment, and compound coupling agent treatment, significantly enhance the bonding strength of CFRP/Ni joints. The research provides insights into improving the connection between nickel and CFRP, as well as other heterogeneous materials.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Agha Intizar Mehdi, Fengping Zhang, Moon-Young Kim
Summary: A spatial stability theory of mono-symmetric thin-walled steel beams pre-stressed by spatially inclined cables is derived and its validity is demonstrated through numerical examples. The effects of initial tension, deviator numbers, inclined cable profiles, and bonded/un-bonded conditions on lateral-torsional buckling of the pre-stressed beams are investigated, with a specific emphasis on the effects of increasing initial tension.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Teng Ma, Jinxiang Wang, Liangtao Liu, Heng Li, Kui Tang, Yangchen Gu, Yifan Zhang
Summary: The structural response of water-back plate under the combined action of shock wave and bubble loads at water depths of 1-300 m was numerically investigated using an arbitrary Lagrange-Euler method. The accuracy of the numerical model was validated by comparing with experimental and theoretical results. The influences of water depth and length-to-diameter ratio of the charge on the combined damage effect were analyzed. The results show that as water depth increases, the plastic deformation energy of the water-back plate decreases, and the permanent deformation mode changes from convex to concave. When the charge has a large length-to-diameter ratio, the plastic deformation energy of the radial plate is higher than that of the axial plate, and the difference decreases with increasing water depth. Increasing the length-to-diameter ratio enhances the combined damage effect in the radial direction in deep-water environments.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiu-Yun Li, Ben Young
Summary: This paper investigates the flexural performance of CFS zed section members bent about the neutral axis parallel to the flanges through experimental and numerical analysis. The results show that the current direct strength method generally provides conservative predictions for the flexural strength of unstiffened zed section members, but slightly unconservative design for edge-stiffened zed section beams. The nominal flexural strengths of zed section members with edge stiffeners were found to be underestimated by 17% to 21% on average. Modified DSM formulae are recommended for the design of CFS zed section beams.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Weinan Gao, Bo Song, Xueyan Chen, Guochang Lin, Huifeng Tan
Summary: This paper presents a precise method for predicting deformation in large-scale inflatable structures, utilizing finite element modeling and laser scanning technique. The study shows a good agreement between the predictive model and non-contact measurement results.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Fei Gao, Zongyi Wang, Rui Zhu, Zhenming Chen, Quanxi Ye, Yaqi Duan, Yunlong Jia, Qin Zhang
Summary: This research investigates the mechanical properties of high-strength ring groove rivet assemblies and the load resistances of riveted T-stubs. Experimental tests reveal that Grade 10.9 rivets have higher yield strength and strain, and lower ultimate strain, making them suitable for high-strength ring groove rivet connections. Increasing the rivet diameter benefits the T-stubs, while increasing the flange thickness is not always advantageous. The Eurocode 3 method is not suitable for T-stubs connected through ring groove rivets, while the Demonceau method is conservative.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Shangchun Jiang, Liangfeng Sun, Haifei Zhan, Zhuoqun Zheng, Xijian Peng, Chaofeng Lue
Summary: This study investigates the bending behavior of two-dimensional nanomaterials, diamane and its analogous structure TBGIB, through atomistic simulations. It reveals that diamane experiences structural failure under bending, while TBGIB bends elastically before undergoing structural failure. The study provides valuable insights for the application of these materials in flexible electronics.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Qiang Zhang, Jianian Wen, Qiang Han, Hanqing Zhuge, Yulong Zhou
Summary: In this study, the mechanical properties of Q690 steel H-section columns under bi-directional cyclic loads are investigated, considering the time-varying characteristics of corrosion. A refined finite element (FE) model is built to analyze the degradation of mechanical property and failure mechanisms of steel columns with different design parameters during the whole life-cycle. The study proposes a quantitative calculation method for the ultimate resistance and damage index of steel columns, taking into account the ageing effects. The findings emphasize the importance of considering the ageing effects of steel columns in seismic design.
THIN-WALLED STRUCTURES
(2024)
Article
Engineering, Civil
Yuda Hu, Qi Zhou, Tao Yang
Summary: The magneto-thermo-elastic coupled free vibration of functionally graded materials cylindrical shell is investigated in this study. The vibration equation in multi-physical field is established and solved using the Hamilton principle and the multi-scale method. The numerical results show that the natural frequency is influenced by various factors such as volume fraction index, initial amplitude, temperature, and magnetic induction intensity.
THIN-WALLED STRUCTURES
(2024)