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学者姓名：郭金泉
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Abstract ：
Inspired by the microstructure of the beetle's elytra, a new bionic polycellular tube protective structure based on the fractal principle was proposed in this paper, and its energy absorption characteristics were studied. Firstly, the typical microstructures of two-branch structure (type A), three-branch structure (type B) and mixed-branch structure (type C) of the beetle's elytra were extracted. Based on that, three types of the bionic multicellular thinwalled circular tube (BMTC) were designed, and the reliability of finite element models was verified by experiments. Secondly, the energy absorption characteristics and crushing mechanism of three groups of BMTCs were compared and analyzed by LS-DYNA software, and the analytical expression of mean crushing force (Fm) for BMTCs was established. The results show that the energy absorption structures of type B have better comprehensive energy absorption characteristics. Compared with the traditional ribbed structure, specific energy absorption (SEA) of BMTCs is increased by 36.75 %. In addition, when the central column is connected to the three ribs, the central column has the best deformation resistance. Moreover, the theoretical solutions matched well with the results of numerical simulation. Consequently, the research results provide inspiration for the design of energy absorption protection devices, and theoretical guidance for the analysis of energy absorption characteristics.
Keyword ：
Beetle ' s elytra Beetle ' s elytra Energy absorption characteristics Energy absorption characteristics Fractal principle Fractal principle LS-DYNA LS-DYNA Mean crushing force prediction expression Mean crushing force prediction expression Multicellular thin-walled circular tube Multicellular thin-walled circular tube
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| GB/T 7714 | Wei, Tieping , Zhang, Mengzhi , Lin, Shouqiang et al. New design and energy absorption characteristic study of bionic beetle's elytra under axial compression [J]. | THIN-WALLED STRUCTURES , 2024 , 196 . |
| MLA | Wei, Tieping et al. "New design and energy absorption characteristic study of bionic beetle's elytra under axial compression" . | THIN-WALLED STRUCTURES 196 (2024) . |
| APA | Wei, Tieping , Zhang, Mengzhi , Lin, Shouqiang , Ye, Jianhua , Yan, Xiaolei , Guo, Jinquan . New design and energy absorption characteristic study of bionic beetle's elytra under axial compression . | THIN-WALLED STRUCTURES , 2024 , 196 . |
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Several methods have been developed to determine the axial creep properties of nuclear fuel cladding tubes. However, the anisotropic creep properties of nuclear fuel cladding tubes requires that their circumferential creep behaviour be evaluated as well. Nonetheless, this task remains extremely challenging owing to need to employ unaltered cylindrical cladding tube specimens directly and the general low accuracy of the methods developed for this purpose. The present work addresses these issues by developing a modified small punch creep test (SPCT). Equations are proposed to calculate the creep stress and strain of the modified SPCT. The accuracy of the equations is analysed using the finite element method. Finally, the methodology is applied to investigate the circumferential creep behaviour of an FeCrAl nuclear fuel cladding tube experimentally. These results clearly demonstrate that the modified SPCT is suitable for investigating the creep behaviour of irregularly shaped material specimens with anisotropic creep properties. Moreover, the semi -cylindrical specimens employed in the modified SPCT also enable the effective fracture strain of the specimen to be easily determined.
Keyword ：
Anisotropic creep Anisotropic creep Nuclear fuel cladding tube Nuclear fuel cladding tube Small punch test Small punch test
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| GB/T 7714 | Zhong, Yuntao , Lai, Huan Sheng , Guo, Jinquan et al. Small punch test for investigating circumferential creep in cladding tubes [J]. | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 267 . |
| MLA | Zhong, Yuntao et al. "Small punch test for investigating circumferential creep in cladding tubes" . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 267 (2024) . |
| APA | Zhong, Yuntao , Lai, Huan Sheng , Guo, Jinquan , Du, Peinan , Huang, Qifei . Small punch test for investigating circumferential creep in cladding tubes . | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES , 2024 , 267 . |
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本发明提出一种双弯曲梁称重传感器，由基础支架、双弯曲梁式弹性体、加载端部、光学干涉仪和信号处理装置组成；所述双弯曲梁式弹性体的一端固定安装在基础支架上，另一端为加载端部；中部设有工字形的通槽，工字形通槽上下双梁为该传感器的变形梁；工字形通槽中间的左右两个悬臂梁为参考臂和测量臂；两路光分别在参考臂和测量臂表面反射，并在光谱仪上形成干涉条纹；通过观察条纹变化量实现对被称重物质量的称量。所述光源采用宽带光，利用宽带光的多波长差分效应，结合频率估计算法，可实现纳米级的高精度测量。因此，该传感器具有分辨率高、灵敏度高，滞后、蠕变和进回程差小，同时抗环境干扰能力强的优势，可实现对待测物的高精度快速测量。
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| GB/T 7714 | 杨晓翔 , 欧阳忠杰 , 梁伟 et al. 双弯曲梁称重传感器 : CN202210065697.5[P]. | 2022-01-20 00:00:00 . |
| MLA | 杨晓翔 et al. "双弯曲梁称重传感器" : CN202210065697.5. | 2022-01-20 00:00:00 . |
| APA | 杨晓翔 , 欧阳忠杰 , 梁伟 , 郭金泉 . 双弯曲梁称重传感器 : CN202210065697.5. | 2022-01-20 00:00:00 . |
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The study of deadweight force standard machines (DWM) that operate over a wide range is at the leading edge and a hot spot in force metrology. Optimizing the combination method of the weight load has important theoretical significance for improving the stability and accuracy of DWMs. Firstly, the law of weight loading position on a pendulum relevant to the hanging system through dynamical theory and finite element methods was studied, likewise the minimum pendular degree caused by the loading on the upper end of the hanging system was determined. Then, a method for optimal combination of weights was presented and carried out using MATLAB software. A force transducer of 1000 kN was selected to test on a 2 MN DWM, and the results show that the method can effectively improve the repeatability and linearity. Finally, compared with two random combination methods, the repeatability deviation decreased by more than 50%, and the linear deviation by approximately 10%.
Keyword ：
Analysis of pendulum Analysis of pendulum Deadweight force standard machine Deadweight force standard machine Force in wide-range Force in wide-range Optimal combination method Optimal combination method
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| GB/T 7714 | Guo, Jinquan , Xu, Zhimeng , Ge, Zhu et al. Optimal Combination Method for Weights Loading of the Deadweight Force Standard Machine [J]. | MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA , 2023 , 38 (3) : 619-628 . |
| MLA | Guo, Jinquan et al. "Optimal Combination Method for Weights Loading of the Deadweight Force Standard Machine" . | MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA 38 . 3 (2023) : 619-628 . |
| APA | Guo, Jinquan , Xu, Zhimeng , Ge, Zhu , Lin, Shuo , Wei, Tieping , Liang, Wei et al. Optimal Combination Method for Weights Loading of the Deadweight Force Standard Machine . | MAPAN-JOURNAL OF METROLOGY SOCIETY OF INDIA , 2023 , 38 (3) , 619-628 . |
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本实用新型涉及一种八足两钳仿生机械螃蟹机构，包括机身底板，机身底板前、后侧具有前后对称的四足运动机构，前侧的四足运动机构上连接有一对蟹钳机构；四足运动机构包括中间支架以及对称设置在中间支架左、右两侧双足运动机构；所述蟹钳机构包括铰接于中间支架上并能相对其左右摆动的摆动件，所述摆动件上铰接有能相对其上下摆动的连接臂，所述连接臂前端转动连接有能相对其旋转的电机架，电机架上对称设置有一对齿轮A，电机架前部对称设置有一对爪杆，所述齿轮A侧部固定连接有与同侧爪杆后端相铰接的齿杆，两侧爪杆中部与电机架前端分布连接有辅助连杆。实现了更大范围的运动，灵活性好，实用性大大提高。
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| GB/T 7714 | 郭金泉 , 陈书鸿 . 一种八足两钳仿生机械螃蟹机构 : CN202320355844.2[P]. | 2023-03-01 00:00:00 . |
| MLA | 郭金泉 et al. "一种八足两钳仿生机械螃蟹机构" : CN202320355844.2. | 2023-03-01 00:00:00 . |
| APA | 郭金泉 , 陈书鸿 . 一种八足两钳仿生机械螃蟹机构 : CN202320355844.2. | 2023-03-01 00:00:00 . |
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Q245R steel has good heat and corrosion resistant and is used in various applications, such as reactors, regenerators, reformed gas steam generators, and other equipment. In this study, the creep behaviour of Q245R steel at the temperature of 550 degrees C is investigated. In addition to the modified Kachanov-Robotnov (K-R) method, the traditional and modified ? projection methods were employed to establish the creep constitutive equations of Q245R steel. The results revealed that at small strains, the creep prediction curve was in good agreement with the test curve, and the prediction accuracy of the modified ? projection method was better than that of the other two models.
Keyword ：
creep model creep model Q245R steel Q245R steel theta projection method theta projection method
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| GB/T 7714 | Guo, Jinquan , Tang, Chaozhongzheng , Wang, Fang et al. Creep behaviour of Q245R steel at 550 degrees C [J]. | MATERIALS AT HIGH TEMPERATURES , 2023 , 40 (3) : 210-217 . |
| MLA | Guo, Jinquan et al. "Creep behaviour of Q245R steel at 550 degrees C" . | MATERIALS AT HIGH TEMPERATURES 40 . 3 (2023) : 210-217 . |
| APA | Guo, Jinquan , Tang, Chaozhongzheng , Wang, Fang , Liu, Kanglin , Zhang, Jingwei , Lai, Huan Sheng . Creep behaviour of Q245R steel at 550 degrees C . | MATERIALS AT HIGH TEMPERATURES , 2023 , 40 (3) , 210-217 . |
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There are increasingly high performance requirements of energy-absorbing systems in aerospace, defense and military, transportation and other fields, especially in the field of emergency protection where the study of self-locking characteristics is of great significance. In this paper, an energy absorption system is designed by snap-fit thin-walled tubes, which can be edited, easy to assemble quickly and spatial omnidirectional self-locking, and the spatial self-locking characteristic of the system was verified by numerical simulation under the uniform/concentrated impact loadings. The results show that the energy-absorbing system can withstand the uniform/concentrated impact loadings in all directions in space. Furthermore, the good comprehensive performance of the loading condition in direction 3 (& alpha; = 90 deg, & beta; = 0 deg) was verified by the quantitative analysis of the complex proportional assessment (COPRAS) method and the qualitative analysis of Radar Diagram method.
Keyword ：
COPRAS method COPRAS method editable editable Energy-absorption system Energy-absorption system finite element analysis finite element analysis impact loading impact loading spatial self-locking spatial self-locking
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| GB/T 7714 | Wei, Tieping , Liu, Wanpeng , Yang, Wu et al. Structural design and self-locking performance verification of the snap-fit spatial self-locking energy absorption system under the impact loading [J]. | INTERNATIONAL JOURNAL OF CRASHWORTHINESS , 2023 , 29 (3) : 414-429 . |
| MLA | Wei, Tieping et al. "Structural design and self-locking performance verification of the snap-fit spatial self-locking energy absorption system under the impact loading" . | INTERNATIONAL JOURNAL OF CRASHWORTHINESS 29 . 3 (2023) : 414-429 . |
| APA | Wei, Tieping , Liu, Wanpeng , Yang, Wu , Zeng, Shoujin , Yan, Xiaolei , Guo, Jinquan . Structural design and self-locking performance verification of the snap-fit spatial self-locking energy absorption system under the impact loading . | INTERNATIONAL JOURNAL OF CRASHWORTHINESS , 2023 , 29 (3) , 414-429 . |
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In this paper, the dynamic and static mechanical properties and thermal properties of rubber materials used in tires were tested, the experimental data were measured and the performance characterization was completed, which laid a foundation for the accurate completion of tire finite element modeling and simulation. Shimazu universal electronic testing machine was used to carry out cyclic stretching under multiple strains on each rubber. When the stress-strain curve reached a stable state, the last tensile curve was taken as the experimental curve. Three common constitutive models were used to fit the experimental data, and the best fitting YEOH model was selected to characterize the static mechanical properties of rubber materials. Secondly, the viscoelastic parameters of the tire at three frequencies corresponding to three speeds were tested by the dynamic thermomechanical analyzer, and the variation curves of the Hysteresis coefficients (tan) at each frequency with the rise of temperature were obtained. And average the points of the curve to get the average value which will be used in the following calculation. Finally, the specific heat and thermal diffusion coefficient of the compound were measured by laser heat conduction instrument, and the density of the compound was measured by drainage method based on the principle of hydrostatics. The thermal conductivity coefficient was calculated by formula. © 2023 The Authors.
Keyword ：
Experimental study Experimental study mechanical property mechanical property thermal properties thermal properties
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| GB/T 7714 | Guo, J. , Ruan, X. , Ding, P. et al. Experimental Study on Dynamic and Static Mechanical Properties and Thermal Properties of Tyre Rubber [未知]. |
| MLA | Guo, J. et al. "Experimental Study on Dynamic and Static Mechanical Properties and Thermal Properties of Tyre Rubber" [未知]. |
| APA | Guo, J. , Ruan, X. , Ding, P. , Gao, J. , Wang, S. , Yang, X. . Experimental Study on Dynamic and Static Mechanical Properties and Thermal Properties of Tyre Rubber [未知]. |
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Diabetic retinopathy(DR) is the major cause of blindness, and the pathogenesis is unknown. Ultra-wide optical coherence tomography angiography imaging (UW-OCTA) can help ophthalmologists to diagnose DR. Automatic and accurate segmentation of lesions is essential for the diagnosis of DR, yet accurate identification and segmentation of lesions from UW-OCTA images remains a challenge. We proposed a modified nnUNet named nnUNet-CBAM. Three networks were trained to segment each lesion separately. Our method was evaluated in DRAC2022 diabetic retinopathy analysis challenge, where segmentation results were tested on 65 UW-OCTA images. These images are standardized UW-OCTA. Our method achieved a mean dice similarity coefficient (mDSC) of 0.4963 and a mean intersection over union (mIOU) of 0.3693. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
Keyword ：
Deep Learning Deep Learning Diabetic Retinopathy Diabetic Retinopathy Medical Segmentation Medical Segmentation
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| GB/T 7714 | Gao, Z. , Guo, J. . Diabetic Retinal Overlap Lesion Segmentation Network [未知]. |
| MLA | Gao, Z. et al. "Diabetic Retinal Overlap Lesion Segmentation Network" [未知]. |
| APA | Gao, Z. , Guo, J. . Diabetic Retinal Overlap Lesion Segmentation Network [未知]. |
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The manufacturing process of nuclear fuel cladding tubes endows them with anisotropic material properties. In this study, a small punch testing (SPT) method was established to investigate the circumferential tensile behavior of nuclear fuel cladding tubes. The specimen of the proposed SPT method was bended and stretched in a single stress state under a punching force. The proposed SPT method was then used to analyze the circumferential tensile behavior of a FeCrAl fuel cladding tube. Finite element simulation results indicated that the SPT method established herein determined ultimate tensile stress with higher accuracy than standard SPT because the plastic strain in the proposed method under maximum force is considerably smaller than that in standard SPT. Moreover, the proposed method can more accurately determine yield stress compared with standard SPT, as reflected by the elastic stage in the load-displacement curve that was a straight line. The test results indicated that the proposed SPT can be used to accurately determine the circumferential yield stress and ultimate tensile stress of nuclear fuel cladding tubes.
Keyword ：
Fuel cladding tube Fuel cladding tube Small punch test Small punch test Tensile behavior Tensile behavior Tensile test Tensile test Yield stress Yield stress
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| GB/T 7714 | Lai, Huan Sheng , Wang, Rongcheng , Zhong, Yuntao et al. A modified small punch testing scheme to investigate the circumferential mechanical behavior of nuclear fuel cladding tubes [J]. | JOURNAL OF NUCLEAR MATERIALS , 2023 , 583 . |
| MLA | Lai, Huan Sheng et al. "A modified small punch testing scheme to investigate the circumferential mechanical behavior of nuclear fuel cladding tubes" . | JOURNAL OF NUCLEAR MATERIALS 583 (2023) . |
| APA | Lai, Huan Sheng , Wang, Rongcheng , Zhong, Yuntao , Du, Peinan , Guo, Jinquan , Huang, Qifei . A modified small punch testing scheme to investigate the circumferential mechanical behavior of nuclear fuel cladding tubes . | JOURNAL OF NUCLEAR MATERIALS , 2023 , 583 . |
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