Article
Materials Science, Multidisciplinary
Peicheng Mo, Jiarong Chen, Chao Chen, Haiqing Qin, Feng Lin
Summary: Polycrystalline cubic boron nitride composites (PCBN) were synthesized by mixing cBN micro-powder, Zr powder, and Al powder in different mass ratios under high temperature and ultra-high pressure conditions. The phase composition and microstructure of the composites were analyzed, and the effects of different Zr/Al mass ratios on the sintering behavior and related properties of PCBN composites were studied. The research found that the highest hardness of the sample, 33.4 GPa, and the best fracture toughness, 6.6 MPa·m(1/2), were achieved when the Zr/Al ratio was 16 wt%:8 wt% (2:1). Furthermore, a PCBN composite with the best density, porosity as low as 0.7%, and the highest strength of 864.2 MPa was obtained when the Zr/Al ratio was 12 wt%:12 wt% (1:1).
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Mechanics
Tao Wang, Junhan An, Huan He, Xin Wen, Xulong Xi
Summary: The paper introduces a novel three-dimensional negative Poisson's ratio energy-absorbing structure based on two-dimensional nonconvex hexagonal cells, showing superior energy absorption capacity through theoretical calculations, finite element simulations, and experimental validation.
COMPOSITE STRUCTURES
(2021)
Review
Materials Science, Multidisciplinary
Ebba Montgomery-Liljeroth, Silvia Schievano, Gaetano Burriesci
Summary: The field of auxetics, which focuses on materials or structures with a negative Poisson's ratio, has gained attention due to their advantageous properties including high indentation and shear resistance. Significant progress has been made in understanding the factors contributing to auxetic behavior, resulting in a wide variety of designed structures. This review provides an overview of identified and designed auxetic structures, discussing their mechanical behavior, structural properties, limitations, and potential applications, with a focus on important works and complementary research.
APPLIED MATERIALS TODAY
(2023)
Article
Engineering, Civil
Jia-Yue Liu, Hai -Tao Liu
Summary: This paper proposes an improved Diabolo shaped honeycomb (DSH) based on re-entrant hexagonal honeycomb (RHH) with negative Poisson's ratio (NPR) property. The energy absorption performance and stability of DSHs under axial and oblique compression are investigated. The results show that the DSHs have better energy absorption capacity than RHHs.
ENGINEERING STRUCTURES
(2022)
Article
Multidisciplinary Sciences
Hewan Li, Jian Liu, Laigui Wang, Tianjiao Ren
Summary: This paper proposes a method to analyze rock samples with different inclination angles from the standpoint of energy, using the bond-base peridynamic theory and the PMB model of brittle materials, combined with laboratory experiments. The whole process of shearing is analyzed, and the LAMMPS software is used to simulate the internal energy change of rock-like materials under shear conditions. The result shows that prefabricated cracks and the inclination of cracks are important factors for specimen damage, which has important theoretical value for rock mechanics research. The research results can reduce the occurrence of rock burst accidents, the difficulty of mine support, and the cost of mining engineering, as well as improve mine safety levels.
SCIENTIFIC REPORTS
(2023)
Article
Mechanics
Yu-Tong Jin, Yan-Hui Qie, Shijie Dai
Summary: Inspired by parallel springs, a new calculation method is proposed for nested parallel honeycomb cells with negative Poisson's ratio (NPR) and Young's modulus reinforcement. The in-plane Young's modulus of parallel cells is equal to the sum of the inner and outer sub-cells, while Poisson's ratio is only related to the outer sub-cell. Four types of double parallel cells are designed and verified, and an analytical model is deduced using dimensionless parameters and finite element simulation. The method is expanded to triple parallel cells and the elastic properties of quintuple parallel cells are forecasted.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Hong-Bin Lin, Hai-Tao Liu, Ming-Ran An
Summary: Star-shaped honeycomb with negative Poisson's ratio has wide applications in improving the crashworthiness of cars due to its low weight, high specific strength, and high energy absorption. The design of a self-similar concentric star honeycomb (SCSH) can further enhance the energy absorption ability, with wall thickness and the number of concentric walls playing crucial roles.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Mathematics
Qian Ma, Junhua Zhang
Summary: This paper investigates the nonlinear constitutive relationship of the auxetic honeycomb structure under large deformations, including in-plane stress, in-plane strain, Young's modulus, and Poisson's ratio. The finite element model is established and compared with theoretical calculations, and the influence of geometric parameters on mechanical properties is studied. These results provide a theoretical basis for further study of the auxetic honeycomb sandwich structure and its engineering application.
Article
Engineering, Mechanical
Mengdi Jia, Zhimin Wu, Xiaoyan Han, Hong Chen, Rena C. Yu
Summary: The critical crack propagation length is crucial for calculating the fracture toughness of concrete and evaluating the safety of cracked concrete structures. This study measured the critical crack propagation lengths of notched three-point bending beams with different geometric dimensions and concrete strength grades using two experimental methods. A modified analytical method was also proposed to accurately determine the critical crack propagation length and derive the fracture toughness of concrete.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Benxing Lou, Fuheng Ma
Summary: This paper investigated the fracture properties of concrete after steam curing at a constant temperature of 60 degrees C for various time periods. The results showed that the initial fracture toughness of concrete increased and then decreased with increasing steam curing time, while the unstable fracture toughness and fracture energy increased monotonously and leveled off between 16 h and 48 h. The equivalent maturity approach was proven to be effective in evaluating fracture parameters of steam-cured concrete. Additionally, it was recommended to keep the steam curing time within 16 hours for better development of fracture properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Geological
L. Ren, H. P. Xie, X. Sun, R. Zhang, C. B. Li, J. Xie, Z. T. Zhang
Summary: The study investigates the fracture properties of Lower Silurian Longmaxi shale by conducting three-point bend tests in three principal fracture orientations. The results show the critical shape coefficient depends on the anisotropic elasticity of the investigated shale, and using a critical shape coefficient for isotropic rock could lead to a maximum error in the calculated fracture toughness. Additionally, the mode I fracture toughness varies across different fracture orientations, with a progressive decrease in fracture energy observed.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Civil
Jiaming Feng, Qingxuan Liang, Yu Dou, Jin He, Yutao Wu, Tianning Chen
Summary: The paper proposes a hierarchical embedded strengthening method that can greatly enhance the stiffness in Honeycomb Metastructure while maintaining a large negative Poisson's ratio.
THIN-WALLED STRUCTURES
(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
Chemistry, Physical
Chunxia Guo, Dong Zhao, Zhanli Liu, Qian Ding, Haoqiang Gao, Qun Yan, Yongtao Sun, Fuguang Ren
Summary: This study conducted experimental tests on various 3D-printed NPR convex-concave honeycomb tubes and discussed the factors influencing their mechanical properties such as elastic modulus and peak force. The results showed that through the reasonable design of NPR, CCHTs have better performance compared to CSHTs.
Article
Materials Science, Multidisciplinary
James N. Grima-Cornish, Daphne Attard, Kenneth E. Evans, Joseph N. Grima
Summary: This work investigates the potential of multi-material honeycombs to exhibit anomalous thermal expansion properties in specific directions, including negative thermal expansion (NTE) and zero thermal expansion (ZTE). It was found that re-entrant honeycombs can exhibit NTE in specific directions when made from positive thermal expansion (PTE) materials, and the conditions for honeycombs to demonstrate ZTE coefficients in specific directions were explored.
FRONTIERS IN MATERIALS
(2021)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)