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作者： Yuan, Hong Han, Jun Mo, Ziyong Zeng, Lan MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China

The mechanical properties of pipe joints are of vital importance to the performance of pipe structures. In order to further understand the whole failure process of adhesive pipe joints to maintain their good condition subjected to tensile loads, the analytical solutions are deduced in this paper, along with the parameter analysis by numerical simulations. A concise rigid-softening cohesive model was adopted to characterize the deformation of the interface. The whole failure process divided into different sections was discussed in detail and closed-form solutions of slip and shear stress were obtained. The finite element method (FEM) model for the bonded pipe joints under certain situations was established using commercial software ABAQUS, and the analytical and FEM results were accordant. The mechanism of shear stress transfer, the growth regulation of interface cracks and the mechanical performance of the joints under tensile loads were quantitatively obtained. These outcomes may help for the design, application and reinforcement of bonded pipe joints and can be compatible to other orthotropic materials. © 2023 World Scientific Publishing Company.

关键词： Shear stress

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Structural damage identification based on transmissibility assurance criterion and weighted Schatten-p regularization

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STRUCTURAL engineering AND MECHANICS 2022年第6期82卷 771-783页

作者： Zhong, Xian Yu, Ling Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

Structural damage identification (SDI) methods have been proposed to monitor the safety of structures. However, the traditional SDI methods using modal parameters, such as natural frequencies and mode shapes, are not sensitive enough to structural damage. To tackle this problem, this paper proposes a new SDI method based on transmissibility assurance criterion (TAC) and weighted Schatten-p norm regularization. Firstly, the transmissibility function (TF) has been proved a useful damage index, which can effectively detect structural damage under unknown excitations. Inspired by the modal assurance criterion (MAC), TF and MAC are combined to construct a new damage index, so called as TAC, which is introduced into the objective function together with modal parameters. In addition, the weighted Schatten-p norm regularization method is adopted to improve the ill-posedness of the SDI inverse problem. To evaluate the effectiveness of the proposed method, some numerical simulations and experimental studies in laboratory are carried out. The results show that the proposed method has a high SDI accuracy, especially for weak damages of structures, it can precisely achieve damage locations and quantifications with a good robustness.

关键词： modal assurance criterion objective function schatten-p norm regularization structural damage identification structural health monitoring transmissibility function

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High Resolution Mode Shapes Identification of Bridge Using Limited Sensors 6th

High Resolution Mode Shapes Identification of Bridge Using L...

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6th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures, SMAR 2022

作者： Nie, Zhenhua Xia, Guanghao Ma, Hongwei College of Science and Engineering Jinan University Guangdong Guangzhou China The Key Laboratory of Disaster Forecast and Control in Engineering Guangzhou Guangdong China Dongguan University of Technology Dongguan China

ISBN: (纸本)9789819933617

In this paper, a new method is proposed for high resolution mode shapes identification of bridge using a limited number of sensors based on proper orthogonal decomposition (POD). Through the physical interpretation of the POD for a simple bridge under moving load, the components of generalize coordinate of POD are verified as the instantaneous status of the modals of the bridge. Based on the physical interpretation, the results proved that each component of the POD consists of a mode shape and the dynamic information of this mode, so that the mode shape can be identified by filtering the dynamic information. This mode shape with a high resolution is completely different from the traditional method which can only provide a spare mode shape because of the limitation of sensors. The simulation results proved that the proposed method can accurately identify the mode shapes with a high resolution. © Tongji University Press 2024.

关键词： Information filtering

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Accurately and explicitly simulating distinct tensile and compressive behaviors of various concretes with new elastoplasticity model

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MULTIDISCIPLINE MODELING IN MATERIALS AND STRUCTURES 2023年第6期19卷 1363-1375页

作者： Liu, Quan-Pu Kang, Jia Tan, Long-Xu Wang, Si-Yu Bruhns, Otto Xiao, Heng Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Ruhr Univ Bochum Inst Mech Fac Civil & Environm Engn Bochum Germany

Purpose - This paper aims to present a direct analysis to demonstrate why markedly different tensile and compressive behaviors of concretes could not be simulated with the Drucker-Prager yield criterion. Design/methodology/approach - This study proposed an extended form of the latter for establishing a new elastoplasticity model with evolving yield strengths. Findings - Explicit closed-form solutions to non-symmetric tensile and compressive responses of uniaxial specimens at finite strain are for the first time obtained from hardening to softening. Originality/value - With such exact solutions, the yield strengths in tension and compression can be explicitly prescribed by uniaxial tensile and compressive stress-strain functions. Then, the latter two are further provided in explicit forms toward accurately simulating tensile and compressive behaviors. Numerical examples are supplied for meso-scale heterogeneous concrete (MSHC) and high-performance concrete (HPC), etc. Model predictions are in good agreement with test data.

关键词： Elastoplastic behavior Concretes Yield strength Hardening and softening Non-symmetric Accurate analysis

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Unified and accurate simulation for large elastic strain responses of rubberlike soft materials under multiple modes of loading

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CONTINUUM MECHANICS AND THERMODYNAMICS 2024年第1期36卷 155-169页

作者： Kang, Jia Tan, Long-Xu Liu, Quan-Pu Wang, Si-Yu Bruhns, Otto T. Xiao, Heng Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China Ruhr Univ Bochum Inst Mech D-44780 Bochum Germany

A new and explicit form of the multi-axial elastic potential for elastic soft materials is constructed by means of two invariants of the Hencky strain. The new elasticity model with this form can bypass coupling complexities and uncertainties usually involved in parameter identification. Namely, exact closed-form solutions of decoupled nature are obtainable for stress responses under multiple benchmark modes. Unlike usual solutions with numerous coupled parameters, such new solutions are independent of one another and, as such, data sets for multiple benchmark modes can be separately matched with mutually independent single-variable functions. A comparative study is presented between a few well-known models and the new model. Results show that predictions from the former agree well with uniaxial and biaxial data, as known in the literature, but would be at variance with data for the constrained stress response in the plane-strain extension. In contrast, predictions from the new model agree accurately with all data sets. Furthermore, exact solutions for the Poynting effect of freely twisted elastic thin-walled tube are obtained from the new model.

关键词： Soft materials Elastic potential Multiple modes Exact solutions Decoupled approach

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Component-based models of beam-column joints exposed to fire in steel framed structures against progressive collapse

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engineering STRUCTURES 2024年 304卷

作者： Guo, Zhan Li, Guokeng Nie, Zhenhua Chen, Yu Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Jinan Peoples R China Fuzhou Univ Coll Civil Engn Fuzhou 350116 Peoples R China

This paper is supplementary research following the previous experimental and numerical studies on the progressive collapse behaviors of beam-column substructures with different joint configurations under middlecolumn removal scenarios induced by fire. The component-based models (CBMs) of beam-column joints exposed to fire, which include the welded web-welded flange (WW) joint, as well as the bolted web-welded flange (BW) joint, were proposed based on refined FE models established in previous studies. Subsequently, the proposed CBMs with detailed spring arrangements and constitutive parameters were incorporated into the ABAQUS software to validate the collapse responses of beam-column joints obtained from both test results and refined solid FE models. A comparison investigation with experimental data indicates that the proposed CBMs can accurately reflect the nonlinear collapse behaviors of different fire-exposed beam-column joints with relatively high computational efficiency. Moreover, the validated CBMs are further incorporated into the collapse analysis of a multi-story planar steel framed structure exposed to fire, by compiling the VUSDFLD subroutine, to realize the component deletion process. The parameter effects of fire location, joint configurations, and loading ratios on collapse behaviors and force redistributions of framed structures exposed to fire were investigated. Based on analysis results, it is shown that the component failure temperature is quite sensitive to whether the specific joint configurations are considered in the analysis of fire-resistant progressive collapse in planar framed structures, which should be paid sufficient attention to in the performance evaluation of collapse resistance. For those planar framed structures with larger loading ratios, it is recommended to increase the section of the frame column or carry out fire protection to prevent the progressive collapse of the structure.

关键词： Progressive collapse Component -based model Numerical simulation Frame analysis Fire-exposed

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Energy Absorption Characteristics of a Novel Asymmetric and Rotatable Re-entrant Honeycomb Structure

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Acta Mechanica Solida Sinica 2021年第4期34卷 550-560页

作者： Huifeng Xi Jiachu Xu Shende Cen Shiqing Huang MOE Key Laboratory of Disaster Forecast and Control in Engineering and School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China

Based on the symmetric re-entrant honeycomb(S-RH)structure with negative Poisson’s ratios,a novel asymmetric and rotatable re-entrant honeycomb(AR-RH)structure was *** the S-RH structure and AR-RH structure were produced by the 3D printing *** experimental test and finite element simulation,the deformation mechanism and energy absorption characteristics of the AR-RH structure and the S-RH structure with negative Poisson’s ratios at different impact velocities were *** experimental test and finite element simulation results show that the novel AR-RH structure with negative Poisson’s ratios has stronger energy absorption capacity than the S-RH structure,and it has been verified that the rotatability of AR-RH can indeed absorb ***,the degree of asymmetry of the AR-RH structure was discussed.

关键词： Asymmetric and rotatable re-entrant honeycomb structure Dynamic compression Energy absorption characteristics Metal 3D printing technology

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Ultrahigh-temperature mechanical behavior and failure mechanisms of SiCf/SiC composites

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CERAMICS INTERNATIONAL 2023年第23期49卷 39391-39399页

作者： Zhao, Guicheng Jiang, Zhonghe Xi, Huifeng Ai, Shigang Beijing Inst Technol Inst Adv Struct Technol Beijing 100081 Peoples R China Jinan Univ Sch Mech & Construct Engn Key Lab Disaster Forecast & Control Engn MOE Guangzhou 510632 Peoples R China

SiCf/SiC composites are potential candidates in the aerospace fields for application as high-temperature struc-tural components. Their mechanical properties and failure behaviors at ultra-high temperatures (above 1473 K) are important to obtain systematically. This work performed the in-plane compressive, bending, and interlaminar shear tests at 1573 K and 1773 K in an inert atmosphere. The results showed dramatically that the in-plane compressive and interlaminar shear strengths increased with the temperature increment from 1573 K to 1773 K. In contrast, a reduction in flexural strength was noticeable. To reveal the failure mechanisms, fracture surface microstructures of these SiCf/SiC samples were characterized. It was found that the fiber surfaces for the samples tested at 1773K were rougher than the samples tested at 1573K. It meant that, with the temperature increasing, the fiber-matrix interfaces enhanced, which resulted in increasing compressive and interlaminar strengths. For the bending tests, serious delamination occurred when the temperature increased to 1773K, which induced the flexural strength reduction. The numerical simulations of bending samples were developed to reveal the mechanism of strength degradation as the temperature elevated.

关键词： SiCf/SiC composites Ultrahigh temperature Mechanical property Failure mode Failure mechanism

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Lattice Dynamics Models to Predict Transmission Properties of Flexural Waves in One-Dimensional Atom Chains with Defects

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Acta Mechanica Solida Sinica 2023年第1期36卷 105-115页

作者： Hao Wu Shihua Huang Jianyi Luo Laitong He Youdi Kuang School of Mechanics and Construction Engineering MOE Key Laboratory of Disaster Forecast and Control in EngineeringJinan UniversityGuangzhou 510632China School of Electro-Mechanical Engineering Zhongkai University of Agriculture and EngineeringZhuhai 519041China School of Applied Physics and Materials Wuyi UniversityJiangmen 529000China School of Civil Engineering and Architecture Wuyi UniversityJiangmen 529000China

Flexural waves usually propagate in one-and two-dimensional *** further our understanding on their transmission properties from the viewpoint of discrete lattice dynamics,we systematically established analytical atom chain models with mass defects and side *** mechanisms of the Bragg scattering and the local resonance corresponding to mass defects and side branches,respectively,are elucidated by means of the present *** results from the models show that increasing the number of mass defects or side branches decreases the transmission magnitude gradually,and the finite-width phononic bandgap may form due to the periodical arrangement of *** interplay between the local resonance and the Bragg scattering gives rise to the narrow phononic bandgap for lattice chains only with periodical side *** width of the bandgap strongly depends on the stiffness of side *** transmission is insensitive to the tensile strain considered for both kinds of defects,but significantly decreases with an increase in damping or wave *** present work helps further our understanding on the dynamics of flexural waves.

关键词： Transmission of flexural waves Lattice dynamics of chains Defects Damping Tensile strains

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The electro-mechanics of piezoelectric coating structure under frictional contacts

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MATHEMATICS AND MECHANICS OF SOLIDS 2023年第12期28卷 2704-2731页

作者： Xiao, Jin-Xin Jiang, Tian-Lin Hou, Peng-Fei Zhang, Wen-Hua Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China Jinan Univ Sch Mech & Construct Engn Guangzhou Peoples R China Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha Peoples R China

In papers of the piezoelectric coating/substrate system under smooth spherical contact (DOI: 10.1177/1081 286519 865773), conical contact (DOI: 10.1016/***.2019.08.031), and cylinder flat head contact (DOI: 10.1007/s11012-019-010851), Green's function method has been applied to solve the problem of piezoelectric friction contact. We deduced the analytical expression of piezoelectric coating structure, which is expressed by elementary functions. The numerical results highlight the best thickness to maintain a higher potential difference and a critical potential difference. This study has guiding significance for the future research and analysis of friction signals in intelligent manufacturing, such as piezoelectric tactile sensors.

关键词： Piezoelectric frictional contact mechanics coating substrate potential difference

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