Article
Engineering, Civil
Feng Jiang, Shu Yang, Chang Qi, Hai-Tao Liu
Summary: In this study, the two plateau characteristics of re-entrant honeycomb (REH) with negative Poisson's ratio (NPR) in the concave direction were investigated through experimental, numerical, and theoretical methods. The results showed that due to the transitional rectangle structures formed during crushing, the REH specimens exhibited a two-step deformation mode and two plateau stresses in the stress-strain curves. Both numerical and theoretical predictions agreed well with the experimental results. Parameter analysis indicated that different geometric parameters influenced the plateau stresses, and the crushing velocity also affected the characteristics of the honeycomb structure.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Sheng Yu, Zhikang Liu, Xiaoming Cao, Jiayi Liu, Wei Huang, Yangwei Wang
Summary: This paper investigates the compressive performance and failure behavior of composite auxetic re-entrant honeycomb sandwich structure. Different gradient configurations of auxetic re-entrant honeycomb structures were manufactured and tested. The compressive responses and deformation mechanisms were analyzed based on stress-strain curves and deformation processes. The Poisson's ratio, energy efficiency, and plateau stress were defined and used to study the auxetic performance and energy absorption ability. A high-fidelity numerical model was established to analyze the compressive performances and failure behaviors, and the results agreed well with experimental results.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Physical
Farrukh Mustahsan, Sohaib Z. Khan, Asad A. Zaidi, Yaser H. Alahmadi, Essam R. Mahmoud, Hamad Almohamadi
Summary: This paper presents a modified re-entrant honeycomb auxetic structure and verifies its performance through analytical modeling, finite element analysis, and tensile testing. The results show that the newly added strut has a significant effect on the directional properties of the structure, and the structure exhibits high Young's modulus and negative Poisson's ratio in both loading directions, especially at low relative density.
Article
Engineering, Civil
Yilin Zhu, Yi Luo, Defeng Gao, Chao Yu, Xin Ren, Chuanzeng Zhang
Summary: A novel 2D re-entrant auxetic honeycomb metamaterial is proposed in this study, which enhances stiffness without compromising auxeticity, while still being convenient and low-cost for fabrication by introducing zigzag inclined ligaments.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
Huiling Wang, Junhua Shao, Wei Zhang, Zhi Yan, Zhengyi Huang, Xuan Liang
Summary: This article experimentally and numerically studied the response and energy absorption of novel sandwich beams with combined re-entrant double-arrow auxetic honeycomb (RDAH) cores subjected to three-point bending. The results show that the RDAH core sandwich beam has better load-carrying and energy absorption capacity when the loading roller is located directly above the re-entrant cell. In addition, factors such as face sheet distribution, cell-wall thickness, impact velocity, and cell configuration also have an influence on the structural response.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Xing Chi Teng, Xin Ren, Yi Zhang, Wei Jiang, Yang Pan, Xue Gang Zhang, Xiang Yu Zhang, Yi Min Xie
Summary: A simple 3D re-entrant unit cell is designed in this study, and the influence of geometric parameters on the performance of the structure is investigated numerically. Experimental results show that the proposed 3D re-entrant auxetic metamaterial exhibits stable compression deformation and desirable energy absorption behavior, which can be utilized for designing protective structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Civil
Xiaolong Zhang, Ruilan Tian, Ziwen Zhang, Guijing Li, Wenjie Feng
Summary: A new vertical strut combined re-entrant auxetic structure has been designed and studied for its mechanical behaviors. Results showed that lightweight structures can significantly enhance auxetic behavior and achieve a high degree of anisotropy compared with conventional re-entrant honeycomb configurations.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Feng Jiang, Shu Yang, Chang Qi
Summary: In this study, a new type of three-dimensional auxetic metamaterial was proposed and its crushing response under quasi-static compression was investigated through experimental tests and numerical simulations. The results showed that the proposed metamaterial exhibited an X deformation mode and had a higher energy absorption capacity compared to other structures. Additionally, the effects of geometric parameters and friction coefficient on the material's performance were also studied.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Pengju Li, Xilin Zhang, Zhengkai Zhang, Qingguo Wen
Summary: A new force measurement method based on the auxetic structure is proposed in this paper, using a light source, auxetic structure, and solar cell. The method avoids contact between components, and experimental results show improved sensitivity and linearity over traditional methods.
IEEE SENSORS JOURNAL
(2021)
Article
Mechanics
Xiaolin Deng, Shangan Qin
Summary: This paper proposes novel re-entrant honeycombs (NREH), designed with asymmetrical subunits to improve their mechanical properties. Three types of NREHs are compared, with similar sigma m and specific energy absorption (SEA) during in-plane impact. However, NREH-3 has a smaller Poisson's ratio. Analysis shows that increasing the wall thickness effectively improves the impact resistance of NREH-3. Additionally, NREH-3 is sensitive to impact velocity, with deformation models changing significantly at higher velocities.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Aerospace
Yu Chen, Zhi-Wei Wang
Summary: This study proposed an improved hexagonal honeycomb structure by replacing the solid junction with a small hollow circle, resulting in a novel honeycomb. Theoretical models based on energy approach were developed to predict the elastic properties of the new honeycomb, and finite element analysis was used to verify the models and investigate the effects of micro geometrical parameters. The results showed that the new honeycomb exhibited a negative Poisson's ratio effect, higher specific Young's modulus and shear modulus compared to the common hexagonal honeycomb. It also demonstrated a more tailored anisotropy. Therefore, the new honeycomb could be an effective substitute for the common hexagonal honeycomb and provide guidance for improved design of auxetic honeycombs.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Feng Jiang, Shu Yang, Yu Zhang, Chang Qi, Shang Chen
Summary: In this study, a novel graded re-entrant circular auxetic honeycomb structure was proposed and fabricated using a low-cost method. The crushing behaviors of different designs of the honeycomb structure were investigated, and the results showed that the gradient design can control the deformation modes and improve the energy absorption capacity. Under dynamic impacts, the honeycomb structure with a negative gradient design exhibited better performance and negative Poisson's ratio behavior. This study provides new insights for the fabrication and design of auxetic metamaterials.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Kang-Jia Liu, Hai-Tao Liu, Jie Li
Summary: This paper proposes a bi-material triangle re-entrant honeycomb (BTRH) structure with tunable coefficient of thermal expansion (CTE), Poisson's ratio (PR), and bandgap. Analytical analysis and numerical simulations are used to quantify the changes in effective CTE, PR, and Young's modulus. Experiments are conducted to validate the theory of effective PR and Young's modulus. The band structures are calculated through finite element analysis, and the effects of geometric parameters and material combinations on mechanical properties are systematically investigated.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Chang Qi, Lian-Zheng Pei, Alex Remennikov, Shu Yang, Feng Jiang
Summary: This paper theoretically studies the crushing response of metallic 3D re-entrant honeycomb structures and analyzes their crushing strength. The results reveal that the oblique wall length and cell wall thickness have a significant effect on the crushing strength, while other parameters have a minor effect. Additionally, a new type of 3D re-entrant honeycomb unit structure is discovered and its crushing strength is derived and validated.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Liang Wang, Hai-Tao Liu
Summary: This work presents a parameter optimization method using Python script to meet the urgent need for lightweight honeycomb metamaterial. Results show that the combination of Python script programming model and genetic algorithm optimization method can achieve optimal solutions for honeycomb metamaterial. The optimized parameters demonstrate an admirable auxetic effect in the 3D honeycomb, providing strong evidence for the continuous application of optimization algorithms in improving mechanical properties.
COMPOSITE STRUCTURES
(2021)
Article
Instruments & Instrumentation
Z. Kesilmis, T. Baran
MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA
(2016)
Article
Engineering, Mechanical
T. Baran, A. K. Tanrikulu, C. Dundar, A. H. Tanrikulu
EXPERIMENTAL TECHNIQUES
(2011)
Article
Mechanics
Tarik Baran, Mitat Ozturk
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2020)
Article
Construction & Building Technology
Cafer Kayadelen, Yakup Onal, Gokhan Altay, Mitat Ozturk, Sercan Serin
Summary: This paper focuses on developing predictive models for International Roughness Index (IRI) of flexible pavement using soft computing systems and multiple predictive attributes. The results show that the models developed, particularly those created through the Gradient Boosting Method (GBM) and Random Forest (RF), have excellent performance in predicting IRI. The structural number (SN) is found to be the most important parameter for IRI according to the variable importance score of the best performing prediction model.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Engineering, Mechanical
Mitat Ozturk, Tarik Baran, Mehmet Seha Tatlier
Summary: This paper reports the nonlinear experimental and numerical works conducted on three different re-entrant cell designs, one of which is a classical re-entrant cell and the other two are modifications based on the classical design. The cellular structure specimens were 3D printed using polylactic acid (PLA) material and crushing tests were conducted. Solid finite element models were used to analyze the specimens, taking into account wall-to-wall frictional contacts. The results were validated by comparing with analytical expressions and experiments. The modified cells showed increased stiffness, energy absorption capacity, and plasticity compared to the classical re-entrant cell.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Geological
C. Kayadelen, G. Altay, Y. Onal, M. Ozturk
Summary: This study experimentally investigates the particle shape effect of granular soils on shear strength characteristics through direct shear tests. The results show that the overall regularity (O-R) parameter of sand particles ranges from 0.788 to 0.909, reflecting the particle shape of the sand mixture. It was found that the maximum shear strength increases with a decrease in the O-R. Geotextile reinforcement improves the interfacial friction angle (phi) of sand mixtures, and the phi increases with decreasing O-R values.
GEOSYNTHETICS INTERNATIONAL
(2023)
Article
Engineering, Civil
Necla Ceylan Bora, Cafer Kayadelen, Gokhan Altay, Yakup Onal, Mitat Ozturk
Summary: This study proposes an environmentally friendly solution for subgrade stabilization using palm tree pruning waste as a soil reinforcement material. The results show that increasing the number of reinforcements and reducing the reinforcement depth can significantly improve the load-bearing pressure behavior of the subgrade. Moreover, all PTPW-reinforced subgrades outperformed geotextile-reinforced subgrades under the same conditions.
Article
Construction & Building Technology
Ebubekir Kaplan, Cafer Kayadelen, Mitat Ozturk, Yakup Onal, Gokhan Altay
Summary: This paper investigates the effects of geotextile and palm tree pruning waste (PTPW) on the performance of sand subgrade. It is found that both geotextile and PTPW can effectively improve the permanent and elastic deformations of the sand subgrade, with better performance observed for geotextile. The burying depths of 50 mm and 100 mm are suitable for both reinforcements. In terms of RDR, geotextile outperforms PTPW.
REVISTA DE LA CONSTRUCCION
(2022)
Article
Mechanics
Mehmet Seha Tatlier, Tarik Baran
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2020)
Article
Engineering, Multidisciplinary
Kerimcan Celebi, Durmus Yarimpabuc, Tarik Baran
JOURNAL OF ENGINEERING RESEARCH
(2018)
Article
Construction & Building Technology
Gultekin Aktas, Ahmed Kamil Tanrikulu, Tarik Baran
ACI MATERIALS JOURNAL
(2014)
Article
Engineering, Civil
Renbing An, Jiacong Yuan, Yi Pan, Duhang Yi
Summary: Traditional timber structures built on sloped land are more susceptible to seismic damage compared to structures built on flat land. The upper portion of the structure is found to be the weak point on sloped land, with potential issues such as tenon failure and column foot sliding.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Elyas Bayat, Federica Tubino
Summary: The current design guidelines for assessing floor vibration performance do not consider the influence of variability in the walking path on the dynamic response of floors. This study investigates the dynamic response of floors under a single pedestrian walking load, taking into account the randomness of the walking path and load. The effectiveness of the current guidelines in predicting floor response is critically assessed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Hyeon-Jong Hwang, Linghui Chen, Zhenhao Zhang
Summary: Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. This study proposed a repairable column with UHPC segments and replaceable energy dissipaters. The test results showed that the columns with UHPC segments and replaceable dissipaters exhibited high strength, deformation capacity, and energy dissipation.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Kartheek S. M. Sonti, Pavan Kumar Penumakala, Suresh Kumar Reddy Narala, S. Vincent
Summary: In this study, the compressive behavior of alumina hollow particles reinforced aluminum matrix syntactic foams (AMSF) was investigated using analytical, numerical, and experimental methods. The results showed that the FE solver ABAQUS could accurately predict the elastic and elastio-plastic behavior of AMSFs. The study also suggested that FE models have great potential in developing new materials and composites under compression loading.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Zheqi Peng, Xin Wang, Zhishen Wu
Summary: In this study, the statistical modeling of fiber-reinforced polymer (FRP) cables using the classic fiber bundle model is explored. The study considers important features of large-scale multi-tendon FRP cables, such as initial random slack and uneven tensile deformation among tendons. A parametric study and reliability analysis are conducted to predict the load-displacement relation and design thousand-meter-scale FRP cables. The study emphasizes the relation between the reliability index beta of the cable and the safety factor gamma of the FRP material.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Yanchao Shi, Shaozeng Liu, Ye Hu, Zhong-Xian Li, Yang Ding
Summary: This paper introduces a damage assessment method for reinforced concrete (RC) columns under blast loading, using modal parameter measurement as the evaluation index. The validity of the proposed method is validated through numerical and experimental analysis. The results show that this modal-based damage assessment method is applicable for non-destructive evaluation of blast-induced damage of RC columns.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Xiaolin Zou, Maosheng Gong, Zhanxuan Zuo, Qifang Liu
Summary: This paper proposes an efficient framework for assessing the collapse capacity of structures in earthquake engineering. The framework is based on an accurate equivalent single-degree-of-freedom (ESDOF) system, calibrated by a meta-heuristic optimization method. The proposed framework has been validated through case studies, confirming its accuracy and efficiency.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jie Hu, Weiping Wen, Chenyu Zhang, Changhai Zhai, Shunshun Pei, Zhenghui Wang
Summary: A deep learning-based rapid peak seismic response prediction model is proposed for the most common two-story and three-span subway stations. The model predicts the peak seismic responses of subway stations using a data-driven approach and limited information, achieving good predictive performance and generalization ability, and demonstrating significantly higher computational efficiency compared to numerical simulation methods.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Jin Ho Lee, Jeong-Rae Cho
Summary: A simplified model is proposed to estimate the earthquake responses of a rectangular liquid storage tank considering the fluid-structure interactions. The complex three-dimensional structural behavior of the tank is represented by a combination of fundamental modes of a rectangular-ring-shaped frame structure and a cantilever beam. The system's governing equation is derived, and earthquake responses such as deflection, hydrodynamic pressure, base shear, and overturning moment are obtained from the solution.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
W. J. Lewis, J. M. Russell, T. Q. Li
Summary: The work discusses the key features and advantages of optimal 2-pin arches shaped by statistically prevalent load and constant axial stress. It extends the design space of symmetric arches to cover asymmetric forms and provides minimum values of constant stress for form-finding of such arches made of different materials. The analysis shows that constant stress arches exhibit minimal stress response and have potential implications for sustainability and durability of future infrastructure.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Wen-ming Zhang, Han-xu Zou, Jia-qi Chang, Tian-cheng Liu
Summary: Saddle position is crucial in the construction and control of suspension bridges. This study proposes an analytical approach to estimate the saddle positions in the completed bridge state and discusses the calculation under different definitions. The relationship between the saddle position and the tower's centerline is analyzed, along with the eccentric compression of the tower. The feasibility of the proposed method is verified through a real-life suspension bridge.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Shaise K. John, Alessio Cascardi, Yashida Nadir
Summary: This study experimentally investigated the use of TRM material for reinforcing concrete columns. The results showed that increasing the number of textile layers effectively increased the axial strength. Additionally, the choice of fiber type and hybrid textile configuration also had a significant impact on strength improvement. A new design model that considers the effects of both the confining matrix and textile was proposed.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chandrashekhar Lakavath, S. Suriya Prakash
Summary: This study experimentally investigated the shear behavior of post-tensioned UHPFRC girders, considering factors such as prestress level, fiber volume fraction, and types of steel fibers. The results showed that increasing prestress and fiber dosage could enhance the ultimate load-carrying capacity of the girders, reduce crack angle, and increase shear cracking load.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Vahid Goodarzimehr, Siamak Talatahari, Saeed Shojaee, Amir H. Gandomi
Summary: In this paper, an Improved Marine Predators Algorithm (IMPA) is proposed for size and shape optimization of truss structures subject to natural frequency constraints. The results indicate that IMPA performs better in solving these nonlinear structural optimization problems compared to other state-of-the-art algorithms.
ENGINEERING STRUCTURES
(2024)
Article
Engineering, Civil
Chun-Xu Qu, Jin-Zhao Jiang, Ting-Hua Yi, Hong-Nan Li
Summary: In this paper, a computer vision-based method is proposed to monitor the deformation and displacement of building structures by obtaining 3D coordinates of surface feature points. The method can acquire a large number of 3D coordinates in a noncontact form, improve the flexibility and density of measurement point layout, and is simple and cost-effective to operate.
ENGINEERING STRUCTURES
(2024)