Article
Mechanics
Yanming Tao, Changliang Lai, Xin Fu, Jie Peng, Wugui Jiang, Hualin Fan
Summary: In this paper, an improved equivalent method is proposed for predicting the axial compression stiffness and strength of one dimensional (1D) lattice IsoTruss column structures. The traditional method neglects the contribution of pyramidal elements in calculating the axial stiffness. In this research, the cylindrical shell is transformed into a plane lattice structure and the contribution of helical members is fully considered. The theoretical predictions of the improved method are compared to finite element modeling (FEM) calculations, and the error is within 1%, indicating a significant improvement in accuracy.
COMPOSITE STRUCTURES
(2023)
Article
Chemistry, Physical
Marco Maurizi, Chao Gao, Filippo Berto
Summary: We have achieved the inverse design of non-uniformly assembled lattices using a machine learning approach, allowing independent control over the geometry and topology of periodic and aperiodic structures, resulting in superior performance.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Mechanics
Xinye Cao, Bin Ji, Yiling Lin, Hualin Fan
Summary: This paper presents the design, fabrication, testing, and analysis of a large-scale additively manufactured (AM) metal matrix composite (MMC) lattice truss sandwich cylinder (LTSC). An elastoplastic multi-failure analyzing method is proposed to predict the failure load and pattern of the LTSC. The results provide insights into the practical application of large-scale AM LTSCs in aerospace engineering compared to widely studied carbon fiber reinforced composite LTSCs.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Dongdong Zhang, Changjin Mo, Yifeng Gao, Hui Yuan, Fei Li, Qilin Zhao, Jun Yang
Summary: In this study, a theoretical model was established to evaluate the torsional rigidity of a new type of fiber-reinforced polymer-metal space truss girder. The model was validated through experimental results and theoretical solutions, demonstrating its accuracy.
Article
Engineering, Mechanical
Jiang Shi, Xiang Liu, Guo-Ping Cai, Liang-Liang Lv, Guang-Qiang Fang, Chao-Lan You, Sai-Jin Yao
Summary: In this paper, an equivalent force method is proposed to solve the problem of using the equivalent beam model for the control design of the original truss structure. The main achievement is to convert the external forces acting on the original truss structure into the equivalent beam model to obtain the equivalent forces. Hence, the control force of the actuator in the original truss structure is obtained by the control design of the equivalent beam model, which makes the vibration of the original truss structure controlled. Finally, the numerical simulation arithmetic example shows that the control force acting on the equivalent model is different from the force acting on the original truss structure, further demonstrating the necessity and validity of the proposed method.
ACTA MECHANICA SINICA
(2023)
Article
Engineering, Multidisciplinary
V. T. Doan, F. Massa, T. Tison, H. Naceur
Summary: This paper presents a new method that efficiently approximates linear buckling loads and mode shapes of finite element structures by coupling a ROM based on HPM with a Kriging model, achieving high precision and reduced computational time. The method is capable of handling uncertain propagation problems using fuzzy formalism, and is also applicable for predicting and optimizing structural characteristics in the field of Additive Manufacturing.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Aerospace
Jie Sun, Jun Sun, Dongfang Zhu, Xiaoxuan Yan
Summary: This paper proposes a novel orthotropic equivalent plate model (EPM) for describing the nonlinear connections in antenna structures used in spaceflight. The EPM is developed based on the Mindlin plate hypothesis and the principle of energy equivalence, and it accurately represents the torsional and bending vibrations of periodic truss structures. Compared to the equivalent beam model (EBM), the EPM can depict the mechanical characteristics along the cross section more accurately. The EPM expands the scope of continuum equivalent modeling of periodic trusses and is more useful in engineering practice.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Pritam Poddar, Mark Olles, Denis Cormier
Summary: This paper investigates a novel additive manufacturing technique called axial lattice extrusion (ALE) that greatly enhances the mechanical properties of polymeric lattice structures, particularly through fiber reinforcement. The ALE process shows great potential for fabricating high-strength, lightweight, large-scale carbon-fiber composite components.
Article
Engineering, Civil
Xuanzhi Li, Suduo Xue, Xiongyan Li
Summary: This paper proposes an equivalent equilibrium force model, EEFM, to evaluate the geometric rationality of cable-truss structures. The model splits the structure into upper and lower cable systems with equivalent nodal forces, allowing for easy evaluation of geometric rationality and direct determination of self-stress mode. The proposed method is applicable for design, geometric correction, and force finding, and is especially advantageous for asymmetric or complex cable-truss structures.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Jianhua Dong, Hualin Fan
Summary: The study focused on buckling-oriented hexagonal lattice structures (BOHLS) made of AISI 316 L for energy absorption in engineering. Quasi-static compression experiments and numerical investigations were conducted to compare the performance of BOHLS and hexagonal lattice structure (HLS) in different compression directions. The results showed that BOHLS had better performance in terms of specific energy absorption and mean crushing force under quasi-static in-plane compression, while HLS outperformed BOHLS in quasi-static out-of-plane compression.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Civil
Shaohua Li, Wenchun Jiang, Xiaolei Zhu, Xuefang Xie
Summary: This paper investigates the effects of localized defects on the mechanical properties and creep performance of the pyramidal lattice truss panel structure (PLTPS) through the development of analytical models. The equivalent elastic modulus model was modified based on experimental data, and it was found that the equivalent creep rate increases exponentially with the increase of defect fraction at elevated temperature. The proposed analytical model provides an efficient criterion for determining whether a structure with certain defects meets engineering requirements.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Civil
Hoo Min Lee, Kang Kuk Lee, Gil Ho Yoon
Summary: This study aims to achieve the thermal structural stability of composite plate structure by developing a topography optimization method and a size optimization method. The validity of the approach is demonstrated through solving several structural optimization problems and an engineering application on reaction turbine blades.
THIN-WALLED STRUCTURES
(2022)
Article
Construction & Building Technology
Xin Yong, Zhongmin Wang, Xiaolei Li, Bo Fan
Summary: The internal forces of the resistance unit of the frame-truss composite wall were studied and a simplified seven-degree statically indeterminate structure model was formed through internal force analysis. The feasibility and rationality of the simplified model were demonstrated by comparing it with the ABAQUS model, providing a method and foundation for analyzing the internal force of the resistance unit under external loads.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Daniel Calegaro, Stefano Mariani
Summary: Periodic elastic metamaterials have the ability to block the transmission of elastic waves, creating band gaps. By using active materials, the band gaps can be actively adjusted in real-time, making use of piezoelectricity and instability-induced pattern transformation.
Article
Engineering, Mechanical
Mei Liu, Dengqing Cao, Xiaoyun Zhang, Jin Wei, Dongfang Zhu
Summary: The paper aims to develop an equivalent nonlinear beam model for forced vibration analysis of the nonlinear beamlike truss, introducing geometric nonlinearity to accurately capture the nonlinear dynamic response using the first four order modes. The efficiency and accuracy of the model are demonstrated through comparisons with finite element simulations, showing good agreements and identifying periodic motions. Additionally, the model shows significant computational cost savings compared to full-scale finite element models.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
