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Time-dependent behavior of discontinuous biocomposites in soft tissues

MECHANICS OF TIME-DEPENDENT MATERIALS 2023年第3期27卷 889-904页

作者： Wu, Jiayu Ma, Guoliang Ning, Zhihua Yuan, Hong Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen 518055 Peoples R China Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

Measurement of the strain rate sensitivity of viscoelastic properties is crucial for accurate predictions of the time-dependent behavior of discontinuous biocomposites in soft tissues. The aim of this study is to develop a shear-lag model for elucidating the dynamic response of discontinuous biocomposites in soft tissues under triangular pulse loading and harmonic loading. The extended shear-lag model is focused on improving the previous shear-lag models considering the mass of fiber and including viscoelastic behavior using the Kelvin-Voigt model for the matrix. Analytical expressions of the relative sliding and interfacial shear stress distribution have been presented to characterize the deformation and stress transfer in discontinuous biocomposites under triangular pulse loading. Under harmonic loading conditions, damping properties of discontinuous biocomposites in soft tissues including complex modulus and loss factor are also analytically derived. The predictive model was verified by finite element simulation results. Finally, the results obtained from the shear-lag model are presented to elucidate how the loading rate and loading frequency influence the dynamic response of discontinuous biocomposites. The findings shed light on the dynamic response of soft tissues subjected to impact loading and hysteresis effect under reciprocating loading, which is essential for a better understanding of soft tissue pathology.

关键词： Shear-lag model Rate sensitivity Discontinuous biocomposites Viscoelasticity Soft tissues

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An accurate and unified study on non-symmetric tensile and compressive responses of elastoplastic bars and beams until failure

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ACTA MECHANICA 2023年第12期234卷 6561-6577页

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

A new and unified approach is proposed toward accurately analyzing overall elastoplastic responses of axially loaded bars and finite bending beams until failure. Results are presented for various constituent materials such as metals, reinforced concretes and reinforced composites, etc. Novelties in three respects are incorporated: (a) new uniaxial stress-strain functions are first presented in explicit forms for the purpose of accurately characterizing non-symmetric tensile and compressive behaviors of axially loaded bars from hardening to softening;(b) explicit solutions to both the varying neutral axis and the flexural moment of finite bending beams are then obtained directly in terms of these two uniaxial functions;and, hence, (c) the complex bending problem of various beams until failure is in a unified manner reduced to a simple issue of fitting two uniaxial functions to tension and compression data from uniaxial testing, thus bypassing the analytical and numerical complexity of various existing approaches. Numerical examples of model predictions are provided for typical constituent materials, including aluminium, meso-scopic heterogeneous concrete and ultra-high performance fiber-reinforced concrete with reinforcing rebars. Good agreement is achieved simultaneously with all experimental data for bars and beams made of these materials.

关键词： Reinforced concrete

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A parametric analysis of the "digitally-derived geometric design" of the facade of the Macau St. Dominic's Church

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JOURNAL OF ASIAN ARCHITECTURE AND BUILDING engineering 2023年第5期22卷 2800-2808页

作者： Tang, Jian Lan, Liyao Jinan Univ Key Lab Disaster Forecast & Control Engn MOE China Guangzhou Peoples R China Guangdong Univ Finance & Econ Guangzhou Peoples R China Jinan Univ MOE China Guangzhou Peoples R China

The Macau St. Dominic's Church was built in 1588 and renovated in 1828. This ancient building in Macau's historical town is listed in UNESCO's World Heritage List. "Digitally-derived Geometric Design" is an important implicit logic of the correlation between numbers and shapes in Western Classic Architecture, and the method of parametric analysis is highly effective in the interpretation of "Digitally-derived Geometric Design". However, there are limited digital studies on Western Classic Buildings in the Far East and even less conducted from a parametric and detailed perspective. With the facade of the Macau St. Dominic's Church as the research subject, this study applied the methods of historical document research, field measurement and digital analysis, especially parametric analysis with the assistance of the modeling software of Rhinoceros 6.0 and the software plug-in of Grasshopper, and analyzed the design features of the facade: its upward "successive decrease by equal difference" in stratification, modularization and golden ratio. The "digitally-derived" design pattern of the Macau St. Dominic's Church is of significant historical value.

关键词： The Macau St Dominic's Church parametric analysis stratification successive decrease by equal difference golden ratio

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Enhancing performance of concrete with glass fiber-reinforced polymer short rebars as coarse aggregates by confinement

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JOURNAL OF BUILDING engineering 2024年 87卷

作者： Li, Zheng-Duan Huang, Shi-Qi Feng, Yu-Xuan Cheng, Cai-Shu Fu, Bing Jinan Univ Sch Mech & Construct Engn Guangzhou 510632 Peoples R China Foshan Univ Sch Environm & Chem Engn Foshan 528000 Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

Cutting glass fiber-reinforced polymer (GFRP) waste into aggregate-size reinforcing bars (short rebars) as coarse aggregates in concrete shows to be an effective approach for recycling waste GFRP composites. The resulting concrete with such short rebars however exhibits a reduction in the compressive strength comparing to the corresponding normal concrete, making it unable to be directly used for structural elements. The concept of using the confining jacket is therefore employed for such concrete to improve its compressive strength and toughness and to be used in structural elements. A total of 48 cylindrical specimens were prepared and tested under axial compression with the replacement ratio of coarse aggregates by the GFRP short rebars and the stiffness of the confining jacket as the two test parameters. The test results indicate that incorporating short GFRP rebars results in a reduction in compressive performance by up to 57.2%, and the use of CFRP jacketing significantly enhances the performance of the concrete with or without GFRP short rebars. Such enhancement tends to be more significant when the stiffness of the confining jackets or the replacement ratio increases. The reduction in the compressive strength due to the incorporation of 25% recycled GFRP short rebars is from 57.2% to 30.7%, when the number of layers of the confining CFRP jacket increases from 0 to 3 piles. Comparisons were made between the test results and the predictions from two widely-used stress-strain models for confined concrete, showing that both models overestimate the ultimate axial strain and Teng et al.'s model generally produces the compressive strength slightly higher than the corresponding test results as well as the predictions from Jiang and Teng's model.

关键词： Recycling Glass fiber reinforced polymer (GFRP) Carbon fiber reinforced polymer (CFRP) Confined concrete Compressive behavior

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Fine Shear-Wave Velocity Structures of Subsurface beneath the Guangdong-Hong Kong-Macao Greater Bay Area with Dense Seismic Array and SPAC Method

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SEISMOLOGICAL RESEARCH LETTERS 2024年第5期95卷 2894-2909页

作者： Pan, Qian Shen, Xuzhang Ye, Xiuwei Wang, Liwei Sun Yat Sen Univ Sch Earth Sci & Engn Zhuhai Peoples R China Southern Marine Sci & Engn Guangdong Lab Zhuhai Peoples R China Guangdong Earthquake Agcy China Earthquake Adm Key Lab Earthquake Monitoring & Disaster Mitigat T Guangzhou Peoples R China Guangdong Sci & Technol Collaborat Innovat Ctr Ear Guangzhou Peoples R China Minist Educ Key Lab Disaster Forecast & Control Engn Urban Earthquake Safety Lab Guangzhou Peoples R China

We apply the spatial autocorrelation (SPAC) method to construct the 3D subsurface shear-wave velocity structure model using the short-period dense seismic array (containing 725 nodal geophones) located at the Guangdong-Hong Kong-Macao Greater Bay area (GBA). We first divided the dense array into numerous subarrays, with each subarray consisting of nine nodal geophones, and obtained 562 subarrays that can provide 1D VS profiles of the same quantity. Then, the SPAC method and genetic algorithm are utilized to extract the dispersion curve of the Rayleigh wave from the raw microtremor data and invert VS structure, respectively. Finally, a 3D VS structure model from the surface to 3.3 km depth is derived by combining all 1D VS structures. Relatively lowvelocity anomalies above 700 m are considered unconsolidated shallow sediments as well as relatively high-velocity anomalies beneath 1100 m are attributed to consolidated granite bedrock. Meanwhile, low-velocity anomalies that are identified through the vertical VS profile at a depth of about 900-3000 m can be contributed to the fractured zone, and striped low-velocity anomalies in the horizontal VS maps reveal the location of the deeply buried faults in the study area. The results also mean that the SPAC method combined with the records of short-period dense seismic array can be effectively applied to image subsurface structures in high-populated urban area. The development of this noise-resistance and environment-friendly geophysical technique provides a reliable and effective way to explore the complicated subsurface geological structures, which is of great significance to urban engineering construction and earthquake disaster reduction work in densely populated urban agglomerations.

关键词： Shear waves

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Stability and accuracy of central difference method for real-time dynamic substructure testing considering mass participation coefficient

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Earthquake engineering and engineering Vibration 2024年第3期23卷 625-636页

作者： Zheng Lichang Xu Guoshan Yang Ge Wang Zhen Yang Kaibo Zheng Zhenyun School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control Ministry of EducationHarbin Institute of TechnologyHarbin 150090China Key Lab of Intelligent Disaster Mitigation Ministry of Industry and Information TechnologyHarbin 150090China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

For real-time dynamic substructure testing(RTDST),the influence of the inertia force of fluid specimens on the stability and accuracy of the integration algorithms has never been ***,this study proposes to investigate the stability and accuracy of the central difference method(CDM)for RTDST considering the specimen mass participation ***,the theory of the CDM for RTDST is ***,the stability and accuracy of the CDM for RTDST considering the specimen mass participation coefficient are ***,numerical simulations and experimental tests are conducted for verifying the effectiveness of the *** study indicates that the stability of the algorithm is affected by the mass participation coefficient of the specimen,and the stability limit first increases and then decreases as the mass participation coefficient *** most cases,the mass participation coefficient will increase the stability limit of the algorithm,but in specific circumstances,the algorithm may lose its *** stability and accuracy of the CDM considering the mass participation coefficient are verified by numerical simulations and experimental tests on a three-story frame structure with a tuned liquid damper.

关键词： real-time dynamic substructure testing central difference method stability mass participation coefficient tuned liquid damper

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A peridynamic model for oxidation of T91 steel in liquid lead-bismuth eutectic

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JOURNAL OF NUCLEAR MATERIALS 2025年 605卷

作者： Tian, Chenwen Zhou, Zhikun Du, Juan Fan, Shuaiqi Chen, Ziguang Huazhong Univ Sci & Technol Dept Engn Mech Wuhan 430074 Peoples R China Nucl Power Inst China Natl Key Lab Nucl Reactor Technol Chengdu 610213 Peoples R China Hubei Key Lab Engn Struct Anal & Safety Assessment 1037 Luoyu Rd Wuhan 430074 Peoples R China Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Peoples R China

In this paper, we present a reaction-diffusion peridynamic model for the oxidation of T91 steel in liquid leadbismuth eutectic (LBE). By integrating oxidation kinetics with diffusion dynamics, our model is applicable to a broad range of high-temperature oxidation processes. Validation against experimental data of oxide scale growth for T91 steel in oxygen-saturated LBE at 400-550 degrees C and up to 13,000 h confirms its accuracy. Furthermore, we demonstrate the model's enhanced accuracy relative to traditional formula-based kinetic models. The new framework is utilized to investigate the influence of temperature and oxygen concentration on oxide scale evolution, indicating that elevated oxygen concentrations and temperatures significantly accelerate oxidation. Additionally, we explore the oxidation behavior of T91 steel with a non-uniform surface and oxide scale cracks, revealing that the outer magnetite oxide scale grows more rapidly than the inner Fe-Cr spinel scale in concave regions. Our model captures the transition of the oxide scale from an irregular to a flat, uniform morphology, aligning with experimental observations. This model demonstrates considerable potential for simulating high-temperature oxidation in complex geometries, including irregular surfaces and cracks, across various environmental conditions.

关键词： Peridynamic Reaction-diffusion Oxidation T91 steel Lead-bismuth eutectic

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Theoretical and Experimental Study on Tension–Torsion Coupling Vibration for Time-Varying Elevator Traction System

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Acta Mechanica Solida Sinica 2023年第6期36卷 899-913页

作者： Peng Xu Qifeng Peng Fusong Jin Jianghong Xue Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction EngineeringJinan UniversityGuangzhou 51063China University of Health and Rehabilitation Sciences Qingdao 266071China School of Architectural Engineering Guangzhou Institute of Science and TechnologyGuangzhou 510540China Qingdao Xinghua Intelligent Equipment Co. Ltd.Qingdao 266114China

Elevators used in ultra-high buildings are prone to vibrating due to their ultra-long traction ropes,which significantly affects the comfort and safety of high-speed ***,vibration of the elevator has always been a topic of research *** paper presents a theoretical model for analyzing the tension–torsion coupling vibration of the time-varying elevator traction *** constitutive relations with the tension–torsion coupling effect of the wire rope are reduced by analyzing the deformation mechanism of the spiral winding wire *** on Hamilton’s principle,the equations of motion and corresponding boundary conditions for the tension–torsion coupling vibration of the elevator traction system are *** Galerkin method is employed to account for the influence of nonlinear boundary conditions and to transform the equations of motion into discrete ones with variable coefficients of time,which are solved using the Newmark-β*** accuracy of the proposed model is justified by the good agreement between theoretical predictions and experimental results,following which,the influence of the operation status and structural parameters of the elevator traction system on its vibration performance is discussed in detail.

关键词： Elevator traction system Wire rope Tension–torsion vibration Time-varying

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Identification of Moving Vehicle Loads Using Instantaneous Vision-Based Vehicle Spatiotemporal Information and Improved Time Domain Method

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INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 2024年第14期24卷 2450163-2450163页

作者： Xu, Bohao Chen, Yuhan Yu, Ling Jinan Univ Sch Mech & Construct Engn MOE Key Lab Disaster Forecast & Control Engn Guangzhou Peoples R China

Accurate identification of moving vehicle loads on bridges is one of the challenging tasks in bridge structural health monitoring, but lacks of intensive investigations to merge the heterogeneous data of vision-based vehicle spatiotemporal information (VVSI) and vehicle-induced bridge responses for moving force identification (MFI) in the existing time domain methods (TDM). In this study, a novel MFI method is proposed by integrating instantaneous VVSI and an improved TDM (iTDM). At first, a novel VVSI method combining background subtraction with template matching is presented to accurately track moving vehicles on bridges. With the calibration technique and camera perspective transformation model, the distribution of vehicles (DOV) on bridges is obtained and used as a priori information in the subsequent MFI. Then, the iTDM is developed based on the MFI equation re-formed in the form of instantaneous VVSI instead of the constant speed vehicle crossing bridges assumed in the traditional TDM. Finally, based on the redundant dictionary matrix composed of Haar functions for a moving load, the MFI problem is converted to explore a solution to the atom vectors and then solved by the Tikhonov regularization method. Experimental verifications in laboratory and a comparative study with the existing three methods are conducted to assess the feasibility of the proposed method. The results show that the proposed MFI method outperforms the existing methods and can effectively identify the moving vehicle loads with a higher and acceptable accuracy. It is successful for the proposed method to replace the assumption of constant speed vehicle crossing bridge in the traditional TDM with the instantaneous VVSI in the MFI problem.

关键词： Moving force identification (MFI) vision-based vehicle spatiotemporal information (VVSI) vehicle-bridge interaction redundant dictionary Harr wavelet function Tikhonov regularization

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Dynamic stability analysis of laminated cylindrical shells considering fluid-structure interaction

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COMPOSITE STRUCTURES 2024年 340卷

作者： Feng, Jihang Wu, Yongfu Xue, Jianghong Lin, Jixin Jinan Univ Sch Mech & Construct Engn Key Lab Disaster Forecast & Control Engn MOE Guangzhou 510632 Peoples R China

This paper investigates the dynamic stability of laminated cylindrical shell submerged in a fluid. Assuming that the fluid is incompressible satisfying the Laplace equation, the coupling relationship between the external pressure from fluid acting on the cylindrical shell and the velocity potential function of the fluid is deduced by using Bernoulli law. Based on Karman-Donnell's thin shell theory, the governing equations for dynamic buckling of the composite laminated cylinder are established by introducing the constitutive relationship for laminated composite structures. Likely functions of the displacement and the stress function for cylindrical shell are proposed to construct Mathieu-Hill equation for dynamic stability of laminated cylindrical shell with fluid-structure interaction and the first three order dynamic instability regions are derived. A good agreement between the solutions from the proposed analysis and from the available literatures justified the accuracy and validity of the proposed analysis. With the established analysis, the influence of various parameters on the dynamic stability of cylinders are analyzed, from which a dynamic stability enhancement scheme suitable for composite laminated cylinders is summarized. It is found that the fluid-structure interaction will greatly reduce the excitation frequency of laminated cylindrical shells but has no effect on their vibration modes.

关键词： Fluid-structure interaction Laminated cylindrical shell Dynamic instability region Parametric resonance Periodic load

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