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SSRN 2022年

作者： Wang, Yunze Zhao, Xuhan Zhang, Chunbo State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Key Laboratory of Traffic Safety and Control of Hebei Province Shijiazhuang050043 China School of Traffic and Transportation Shijiazhuang Tiedao University Shijiazhuang050043 China

Few studies have examined the psychological experience of drivers of manned vehicles sharing the road with driverless vehicles. To judge whether drivers think they are in a vulnerable state and find out what makes drivers feel they will be in a state we called "expected psychological vulnerability", this paper conducted a questionnaire to collect information about the attitude, perceived usefulness, trust, perceived risk, and demographic information of drivers in a hypothetical situation involving driving on the same road as driverless vehicles. Our goal was to identify areas where the drivers felt that they would be in a "vulnerable psychological state", i.e., that they would be more vulnerable to making poor psychological judgments. The survey results indicated that 43.7 % of the respondents believed that they would be in a vulnerable state in mixed traffic competition, 30.2 % of the respondents did not know whether they would be in a vulnerable state. Further, women, people with a higher education, people with a more aggressive driving personality, older people, and those with more driving experience were more inclined to think that they would not be in a vulnerable state. Attitude, trust, and perceived usefulness all had positive impacts on judgments regarding psychological vulnerability, and perceived risk had a negative impact. Therefore, the early promotion of driverless technology should give priority to people with a higher education, more driving experience, older age, and more aggressive driving personality, and focus on attitudes towards this technology, including perceived usefulness, trust, and perceived risk. © 2022, The Authors. All rights reserved.

关键词： Vehicles

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The Effect of High-Temperature Deformation Twinning on the Work Hardening behavior of Fe-38mn Alloy During Hot Shear-Compression Deformation

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SSRN 2023年

作者： Sang, Deli Xin, Xiaoli Fu, Ruidong Li, Yijun Jing, Lei College of Materials Science and Engineering Shijiazhuang Tiedao University Hebei Shijiazhuang050000 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Northwest Institute for Nonferrous Metal Research Xi’an710016 China

The effect of high-temperature deformation twinning on the work hardening behaviors of Fe-38Mn alloy during hot shear-compression deformation was investigated. The flow curves for hot shear-compression deformation of Fe-38Mn alloy exhibit the characteristics of continuous work hardening. The deformation was uniform shear-compression deformation with no significant strain localization, but the shear action gradually increased with the increase of strain rate. Benefited from such deformation characteristics, the dynamic microstructure evolution was pioneered by "bulged" mechanism and had geometric and sub-grain migration characteristics, which was continuous dynamic recrystallization in nature and accompanied by a large number of micro-shear bands and deformation twins. Particularly, the work hardening rate curve is classified into five stages considering the deformation twinning during hot shear-compression deformation. © 2023, The Authors. All rights reserved.

关键词： Shear bands

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Evolution of Pore-Fracture and Permeability During Co2+O2 In-Situ Leaching Process of Fractured Sandstone

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SSRN 2024年

作者： Niu, Qinghe He, Jiabin Yuan, Wei Chang, Jiangfang Wang, Wei Yuan, Junhong Wang, Qizhi Zheng, Yongxiang Shang, Songhua Key Laboratory of Roads and Railway Engineering Safety Control Shijiazhuang Tiedao University Ministry of Education Shijiazhuang050043 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines Shijiazhuang050043 China State Key Laboratory of Nuclear Resources and Environment East China University of Technology Nanchang330013 China School of Transportation Inner Mongolia University Hohhot010021 China School of Civil Engineering Hebei University of Science and Technology Shijiazhuang050018 China

This work is organized to reveal the influence mechanism and law of CO2+O2 in situ leaching on pore permeability characteristics of stimulated deposits. Results show that geochemical reactions during the CO2+O2 ISL process are complex, the dolomite and potassium feldspar are dissolved, while the clay mineral precipitates are formed. The response characteristics and mechanisms of pore-fracture structures differ between the single and multi-fractured samples during the CO2+O2 ISL process. The pore number density of the single-fractured sample increases while porosity decreases, causing larger pores to evolve into smaller ones. While the porosity and fracture volume of the multi-fractured sample increase significantly. The permeability characteristics of fractured samples are consistent with the evolution of pore-fracture structures. The multi-fractured sample possesses a higher fracture compression coefficient and lower PLR due to the larger compressive space, the self-supporting effect of fracture network and the scouring effect of leaching solution. Although creating a single fracture in reservoir stimulation can enhance the original deposit permeability, the conductivity will gradually decline during the subsequent CO2+O2 ISL process. Optimizing reservoir stimulation techniques to create complex fracture networks within deposits can enhance overall permeability and weaken the permeability reduction effect, ensuring the efficient extraction of uranium resources. © 2024, The Authors. All rights reserved.

关键词： Fracture

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Model Test and Numerical Simulation Study on Soil Arching Effect Evolution Of Pile - Supported Reinforced Embankment

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SSRN 2024年

作者： Wang, Xin Yang, Guang-Qing Li, Hao-Ran Hebei GEO University Hebei Shijiazhuang050030 China The 6410th Factory of the People's Liberation Army of China Hebei Shijiazhuang050307 China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China

The mechanical behavior of pile-supported reinforced embankment is complex, and the shape of soil arch has not been unified. It is of great scientific value to further study the mechanism of soil arch effect. Through three-dimensional model test, this paper studies the influence of embankment filling properties, pile spacing and horizontal reinforcement on soil arching effect. Based on the stress monitoring results of foundation surface and embankment internal, the formation process and evolution mechanism of soil arching effect in cohesive soil embankment were studied. The arch axis expressions of the central area between four piles and the strip area between two piles were proposed by numerical simulation. The results show: The differential settlement of pile-soil has a great influence on the degree of soil arching effect. The increase of pile spacing promotes the soil arching effect to a certain extent, but too large pile spacing will increase the settlement of roadbed;The cohesion of embankment has a certain promoting effect on load transfer. With the increase of cohesion, the differential settlement of pile-soil decreases gradually;Under the action of the reinforcement, the internal structure of the soil arch changes;The height of soil arch is related to the net spacing of pile cap. The maximum height of soil arch in the strip area between two piles is 1.10(s-a), and the maximum height of soil arch in the central area between four piles is 1.64(s-a). © 2024, The Authors. All rights reserved.

关键词： Piles

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Optimization of the Evaluation Indexes for the Low-Temperature Performance of Asphalt Mixture Based on Relaxation Characteristics of Thermal Cracking Mechanism

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SSRN 2022年

作者： Sun, Zhiqi Qi, Haonan Yi, Jie Li, Shaohua Tan, Yiqiu Ren, Jianying Xu, Yongli State Key Laboratory of Mechanical behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China Key Laboratory of Mechanical Behavior Evolution and Control of Traffic Engineering Structures Shijiazhuang Tiedao University Hebei Shijiazhuang050043 China School of Transportation Science and Engineering Harbin Institute of Technology Harbin150090 China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology China School of Civil Engineering Northeast Forest University Harbin150090 China

Thermal cracking behavior of asphalt pavement includes thermal contraction, low temperature relaxation and low temperature damage. A great quantity of theoretical and experimental studies on the characterization of low-temperature performance had mostly focused on characterizing low-temperature performance with low-temperature relaxation or low-temperature failure performance, resulting in incomplete evaluation of low-temperature performance of asphalt mixtures. Considering the relaxation performance is one of the key factors in the thermal cracking mechanism of the asphalt mixture, the evaluation indexes were established and optimized according to the relationship between the viscoelastic characteristics and the relaxation performance. Combined with the relationship among the low-temperature performance obtained by Thermal Stress Restrained Specimens Test (TSRST) and the evaluation indexes, then the evaluation indexes for the low-temperature performance of asphalt mixture were preferably selected. Firstly, according to the conversion of viscoelastic information in the time domain and frequency domain, the relationship between viscoelastic characteristics and relaxation characteristics was analyzed. Secondly, depending on the characteristics of relaxation characteristics in time, the relaxation rate and the cumulative stress per unit strain rate were proposed as evaluation indexes to characterize the long-term and short-term relaxation characteristics of asphalt mixtures, respectively. Finally, the relationship between asphalt binders and asphalt mixtures with different evaluation indexes and low temperature performance was analyzed. The results showed that relaxation rate, stored shear modulus and cumulative stress per unit strain rate (below -20 °C) apply to the evaluation of low-temperature performance among gradation types, and the average slope of complex modulus and the average slope of relaxation rate-temperature curve with temperature apply to the evaluation

关键词： Asphalt mixtures

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A Novel Dynamic Data Driven Tire Model

Research Square

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Research Square 2021年

作者： Zhang, Junning Yang, Shaopu Lu, Yongjie Key Laboratory of Mechanical behavior System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China

In the study of vehicle dynamics, the accurate description of tire mechanical characteristics is the basis and key of vehicle dynamics simulation. An innovative tire model is proposed based on fuzzy algorithm and a sinusoidal membership function is used to design fuzzy rules. In order to ensure the accuracy of tire behavior calculation, this model is driven by a small amount of experimental data of tire mechanical characteristics. This tire model consists of four layers of fuzzy systems, each of which has a knowledge base. The data in knowledge base Ⅰ is obtained by experiments, and the data of knowledge base Ⅱ is computed by the upper system, and so is the later system. Then, the input signal, the change rate of side slip angle and slip rate, is considered to improve the calculation accuracy of the model. The proposed fuzzy tire model can accurately predict the longitudinal force, lateral force and self-aligning torque of the tire under unknown conditions. Finally, by comparing the fuzzy tire model with the experimental data, it is found that the maximum RRMSE (Relative Root Mean Square Error) value is not more than 0.14. It is proved that the model can accurately describe the tire mechanical characteristics under combined conditions. © 2021, CC BY.

关键词： Membership functions

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Mathematical model of a three-layer nano-beams based on the hypotheses of the Grigolyuk–Chulkov and the the nonlocal theory

Mathematical model of a three-layer nano-beams based on the ...

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第八届国际振动工程会议

作者： Yu-fei Hu Xue-Qian Fang Chang-Song Zhu State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Department of Engineering Mechanics Shijiazhuang Tiedao University

The mathematical model of three-layered beams developed based on the hypothesis of the Grigolyuk–Chulkov and the nonlocal theory and the size depended equations governing the layers motions on the nano-scales is constructed. The Hamilton’s principle yields the novel equations of motion as well as the boundary/initial conditions regarding beams displacement. The latter ones clearly exhibit the size dependent dynamics of the studied nano-beams,

关键词： Chulkov and the the nonlocal theory Mathematical model of a three-layer nano-beams based on the hypotheses of the Grigolyuk

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Experimental Study on Coupling Effects of Galloping of a Square Cylinder

Experimental Study on Coupling Effects of Galloping of a Squ...

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第八届国际振动工程会议

作者： Wenyong Ma Xiaobin Zhang School of Civil Engineering Shijiazhuang Tiedao University State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University

Static and elastically mounted square cylinders were tested in wind tunnel to illustrated the characteristics of galloping of a square cylinder. Aiming to reveal the coupling effect in galloping and validity of quasi-steady assumption in estimating the galloping response, aerodynamic forces in both still and vibrating cylinder are discussed. Meanwhile, the amplitudes and corresponding forces are also analyzed. The results show that the occurrence of galloping can be perfectly predicated by the static aerodynamic forces based on quasi-steady assumption. However, the aerodynamic force on vibrating cylinder illustrates significant difference because of the coupling effects. In another words, more complicated coupling effect need to be considered on estimating the aerodynamic force and galloping responses in terms of static aerodynamic forces and structural dynamics.

关键词： Experimental Study on Coupling Effects of Galloping of a Square Cylinder

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Evaluation method and application of urban underground space networked expansion disturbance

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Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (engineering Science) 2022年第7期56卷 1363-1374页

作者： Liu, Zhi-Chun Lei, Sheng-Xiang Li, Guo-Liang Zhang, Zhen-Bo Hu, Zhi-Nan State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang050043 China School of Civil Engineering Shijiazhuang Tiedao University Shijiazhuang050043 China China Railway Construction Limited Corporation Beijing100855 China China Railway First Survey and Design Institute Group Limited Corporation Xi’an710043 China

Five expansion pattern types and eighteen structure types were proposed, as well as the "four elements" of the expansion system based on the investigated cases of underground space expansion projects in order to evaluate the disturbance effect of urban underground space network extension construction. The total evaluation objective composed of four sub-objectives, including extensional structure, existing structure, stratum and surrounding environment, and six stress and displacement evaluation indexes were determined based on the analysis of the expansion disturbance conduction path and the internal working mechanism of its elements. The analytic hierarchy process (AHP) was used to construct the judgment matrix. The evaluation index weight was determined by expert scoring. Then the control value grading method was applied to determine the membership degree of the evaluation index, thereby constructing a five-level urban underground space network expansion disturbance classification evaluation standard. The application of the above evaluation method was conducted. The order of expansion disturbance degree of different expansion methods is expansion by small>vertical expansion>horizontal expansion >connected connection, and the order of expansion disturbance degree of different stratum is soft soil >loess >alluvial-diluvial strata>rock. The expansion disturbance degree will decrease significantly with the increase of the proximity distance for horizontal expansion. © 2022 Zhejiang University. All rights reserved.

关键词： Grading

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Localized space-tim e method of fundamental solutions for three-dimensional transient diffusion problem

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Acta Mechanica Sinica 2020年第5期36卷 1051-1057,I0002页

作者： L.Qiu J.Lin Q.-H.Qin W.Chen International Center for Simulation Software in Engineering and Sciences College of Mechanics and MaterialsHohai UniversityNanjing 210098China College of Engineering and Computer Science Australian National UniversityCanberraACT 2601Australia State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China State Key Laboratory of Acoustic Institute of AcousticsChinese Academy of SciencesBeijing 100190China

A localized space-time method of fundamental solutions(LSTMFS)is extended for solving three-dimensional transient diffusion problems in this *** interval segmentation in temporal direction is developed for the accurate simulation of long-time-dependent diffusion *** the LSTMFS,the whole space-time domain with nodes arranged i divided into a series of overlapping subdomains with a simple *** each subdomain,the conventional method of fundamental solutions is utilized and the coefficients associated with the considered domain can be explicitly *** calculating a combined sparse matrix system,the value at any node inside the space-time domain can be *** experi-ments demonstrate that high accuracy and efficiency can be simultaneously achieved via the LSTMFS,even for the problems defined on a long-time and quite complex computational domain.

关键词： Localized spacetime method of fundamental solutions Meshless method Long-time evolution Transient diffusion

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