检索结果-内蒙古大学图书馆

30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Zhu, Tingting Lian, Pei Wu, Zhibo Zhang, Chenxu Miao, Yinggang Wang, Haiying The Sixth Department Xijing Hospital of Digestive Diseases the First Affiliated Hospital of Air Force Military Medical University Shaanxi Xi’an710032 China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application School of Aeronautics Northwestern Polytechnical University Shaanxi Xi’an710072 China

ISBN: (纸本)9783031829062

In daily medical operation, penetration of syringe needles into the rubber plug, usually produces micro particles due to plug failure, which has been attracted increasing attentions for patient’s health. In this work, the needle penetration is investigated experimentally and numerically, by focusing on penetration process. Firstly, mechanical behaviors of butyl rubber material are obtained experimentally, by performing various strain rate experiments based on Instron 5848 machine and Hopkinson tension bar technique. The distinct strain rate-dependence is found of rubber mechanic behaviors. Its constitutive relation and parameters are then determined, and used for numerical simulation work. Penetrations of traditional syringe needle are designed and experimented through butyl rubber plugs of vials. As a result, plug mass loss is obtained to investigate the micro particles’ generation. Finally, the finite element model is built based on Abaqus code, of which the smoothed particle hydrodynamics method is introduced for plug fracture behavior. Numerical simulations are performed for penetration process, and the results is basically consistent with the experiment. More accurate simulation work will be performed for detailed penetration responses, and even fracture dependence on needle configuration and so on. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Needles

来源：评论

学校读者我要写书评

暂无评论

Comparison of Data-Driven Approach and MAT224 Material Model: A Numerical Study on the Ballistic impact Behavior of 2024-T351 Aluminum Plates

引用

Aerotecnica Missili & Spazio 2025年 1-14页

作者： Qiao, Yejie Li, Xin Zhao, Han Zhang, Chao School of Civil Aviation Northwestern Polytechnical University Xi’an China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications Northwestern Polytechnical University Xi’an China School of Aeronautics Northwestern Polytechnical University Xi’an China

Numerical simulation is a feasible and effective way to investigate the ballistic impact behavior of material. In this research, the numerical simulations of ballistic impact behavior of 2024-T351 Aluminum plates with different thicknesses struck by blunt projectiles are conducted via two numerical approaches, including a data-driven approach using the commercial software ABAQUS/Explicit and MAT224 material model using the commercial software LS-DYNA, are employed to analyze the impact response of 2024-T351 Aluminum plates, respectively. Within the data-driven approach, an enhanced rate-dependent data-driven constitutive model is utilized to describe the mechanical response, where the classical Johnson–Cook fracture criterion is employed to characterize the fracture behavior of the materials during impact simulations. Finally, the relationship between residual velocity and impact velocity, ballistic limit velocities, strain, local displacement, and penetration process are comprehensively investigated to make a detailed comparison between these two numerical approaches. It is found that the data-driven approach provides better accuracy in predicting ballistic limit velocities. Additionally, the data-driven approach differs from the MAT224 material model in the numerical simulation of target plate penetration. This research is to provide instructions for the choice of a numerical approach to the impact simulation of 2024-T351 aluminum.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Synergistic effects of Ce and Ni on hydrogen storage properties in Mg-based alloys

引用

Materials Today Communications 2025年 46卷

作者： Cao, Xi Heng, Zhonghao Li, Kuangji Li, Jian Jin, Chen Shen, Jianghua School of Mechanical Engineering Qinghai University Qinghai Xining810016 China Qinghai Yanhu Telimei Co. Ltd Qinghai Xining China School of Aeronautics Northwestern Polytechnical University Shaanxi Xi'an710065 China Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application Northwestern Polytechnical University Shaanxi Xi'an710065 China

To address the kinetic limitations of Mg-based hydrogen storage materials, the synergistic effects of Ce and Ni on hydrogen storage kinetics of Mg-based alloys were investigated. Microstructural evolution studies reveal that the as-cast 18R-type long-period ordered stacking phase (LPSO) phase decomposes into MgH2 and CeH2.73 phases, with an average particle size of approximately 50 nm after initial hydrogen absorption. The Mg-10Ni-10Ce alloy demonstrates exceptional hydrogen storage kinetics. At 300 °C and 40 bar H2, Mg-10Ni-10Ce particles with a size range of 200–400 μm can dehydrogenate up to 6.4 wt% within 10 min and rehydrogenate up to 5.9 wt% within 1 h. This performance significantly surpasses that of Mg-8Ni control samples with same particle size. Analysis reveals that the addition of Ni significantly enhances dehydrogenation kinetics, while CeH2.73 particles accelerate H2 dissociation and serve as nucleation sites for the MgH2 phase. This synergistic effect markedly improves the hydrogen storage kinetics of the Mg-Ni-Ce alloy. © 2025 Elsevier Ltd

关键词： Hydrogen storage alloys

来源：评论

学校读者我要写书评

暂无评论

Size Effect on Onset and Subsequent Evolution of Adiabatic Shear Band:Theoretical and Numerical Analysis

引用

Acta Mechanica Solida Sinica 2020年第3期33卷 294-306页

作者： Jiejian Liu Tao Suo Fenghua Zhou Yulong Li School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application Xi'an 710072China Joint International Research Laboratory of Impact Dynamics and Its Engineering Application Xi'an 710072China The Faculty of Mechanical Engineering and Engineering Mechanics Ningbo UniversityNingbo 315211China

The adiabatic shear instability of ductile materials has attracted more and more attentions of researchers and groups,who have been sparing no effort in further understanding of the underlying mechanism since the first experimental depiction of adiabatic shear instability by Zener and *** for the adiabatic shear instability,many factors account for its occurrence,including heat conduction,inertia effect,microstructure effect and so ***,lots of experimental evidence has shown that metal materials display a strong size effect when the characteristic length scale is in the order of *** size effect has also been observed in the analysis of shear band in the ductile materials because the order of the bandwidth stays within the microscale ***,a comprehensive understanding of the whole process of adiabatic shear banding(ASB),including the early onset and the subsequent evolution,is still *** this work,a gradient plasticity model based on the Taylor-based nonlocal theory feasible for the linear perturbation analysis and convenient for numerical calculation is proposed to investigate the strain gradient on the onset of ASB and the coupling effect of heat conduction,inertia effect and strain gradient at the early stage,as well as on the subsequent evolution process at later *** for the onset of ASB,the linear perturbation method is used to consider the effect on the initial formation of *** the investigation of the onset of *** characteristic line method is applied to describe the subsequent nonlinear evolution process of *** stages of ASB evolution are clearly depicted during the evolution process,and the significance of size effect on the ASB nonlinear evolution process of ASB at different stages is *** the help of linear perturbation analysis and characteristic line method,a comprehensive description of the role of strain gradient in the ASB from the early onset to the end of the evolution is provided.

关键词： Adiabatic shear band Strain gradient Nonlinear evolution process Linear perturbation method Characteristic line method

来源：评论

学校读者我要写书评

暂无评论

Experimental methods for determination of mechanical behaviors of materials at high temperatures via the split Hopkinson bars

引用

Acta Mechanica Sinica 2020年第6期36卷 1275-1293,I0003页

作者： Q.B.Dou K.R.Wu T.Suo C.Zhang X.Guo Y.Z.Guo W.G.Guo Y.L.Li School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China Joint International Research Laboratory of Impact Dynamics and its Engineering Application Xi’an710072China Shaanxi Key Laboratory of Impact Dynamics and its Engineering Application Xi’an710072China State Key Laboratory for Strength and Vibration of Mechanical Structures School of AerospaceXi’an Jiaotong UniversityXi’an710049China

Full understanding of the thermomechanical behaviors of materials at high strain rates and high temperatures are of great importance from not only scientific meaning but also practical value in engineering structure design and safety *** efforts have been made for abilities of operation the split Hopkinson bars,the most popular technique for experimental determination of mechanical behaviors of materials over the strain rates from 10^2 to 10^4 s^−1 over the past 70 years,at high temperatures since 1960s.A review of experiment work is presented in this paper to give an overview of the development of experimental techniques at high temperatures based on Hopkinson bar *** principles of the split Hopkinson bar requires the loading bars avoiding temperature gradient or keeping relatively low temperature when performing high temperature *** such as performing temperature gradient corrections,rapid heating or using special designed automatically assembled systems were proposed by researchers to enable the operation of the split Hopkinson bars at temperature as high as ***,to the application of high speed photographic technique for capturing the dynamic deformation process of the specimen in high temperature Hopkinson bar testing,some key issues of eliminating the strong thermal radiation induced lights oversaturation and de-blurring of images due to insufficient exposure at high temperature and high strain rate condition,as well as fabrication of high contrast speckle pattern for high temperature digital image correlation measurement were also *** technique can now enable the split Hopkinson bar testing to be performed at high temperature up to 1873 K under the loading conditions of compression or tension with the in situ observation and full field measurement of deformation as *** paper concludes with summaries of the most important achievements and highlighting of the prospects,trends and remaining challenge

关键词： Mechanical behaviors Split Hopkinson bar High strain rate High temperature

来源：评论

学校读者我要写书评

暂无评论

Mechanical behavior of nanorubber reinforced epoxy over a wide strain rate loading

引用

Nano Materials Science 2024年第1期6卷 106-114页

作者： Yinggang Miao Jianping Yin Wenxuan Du Lianyang Chen Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications School of AeronauticsNorthwestern Polytechnical UniversityXi'anShaanxi710072China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong UniversityXi'anShaanxi710049China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application School of AeronauticsNorthwestern Polytechnical UniversityXi'anShaanxi710072China

Nanorubber/epoxy composites containing 0,2,6 and 10 wt%nanorubber are subjected to uniaxial compression over a wide range of strain rate from 8×10^(-4) s^(-1) to~2×10^(4) s^(-1).Unexpectedly,their strain rate sensitivity and strain hardening index increase with increasing nanorubber *** mechanisms are proposed based on numerical simulations using a unit cell *** increase in the strain rate sensitivity with increasing nanorubber content results from the fact that the nanorubber becomes less incompressible at high strain,generating a higher hydro-static *** shear localization starts to occur in the epoxy under a strain rate of 22,000 s^(-1) when the strain exceeds *** presence of nanorubber in the epoxy reduces adiabatic shear localization by preventing it from propagating.

关键词： Strain rate Strain hardening Nano rubber Epoxy Adiabatic shearing localization

来源：评论

学校读者我要写书评

暂无评论

Effects of surface topography and specimen thickness on high-speed raindrop impact damage of CFRP laminates

引用

Chinese Journal of Aeronautics 2023年第6期36卷 186-200页

作者： Naidan HOU Renxi ZHAO Xuan WANG Zhongbin TANG Hao CUI Yulong LI School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Joint International Research Laboratory of Impact Dynamics and Engineering Application Xi'an 710072China Shaanxi Key Laboratory of Impact Dynamics and Engineering Application Xi'an 710072China School of Civil Aviation Northwestern Polytechnical UniversitySuzhou 215400China NPU Yangzi River Delta Research Institute Suzhou 215400China

Raindrop impact erosion has been observed since early days of aviation,and can be catastrophic for exposed materials during supersonic flight.A single impact waterjet apparatus is established for mimicking drop impacts at the velocities between 350 m/s and 620 m/*** Fiber Reinforced Polymer(CFRP)laminates with three different surface morphologies and specimen thicknesses are tested here.A central region with no visible damage has been noticed,surrounded by a"failure ring"with common damage patterns including resin removal,matrix cracking,fiber breakage and mass fiber *** features are presented in the"failure ring"whose whole scope extends larger along the longitudinal direction than the transverse direction of the top *** mechanism of the resin removal is related to fiber-matrix debonding,and its onset and propagation can be facilitated by initial surface asperities with the shear action of the lateral *** cases of multiple impact,good surface quality can slow down the evolution of resin removal and fiber exposure on the CFRP surface,reducing the erosion speed and delaying the occurrence of structural damages in the subsequent *** wave dominates the occurrence of matrix cracking on the CFRP surface,and subsequently,results in material loss and peeling of the top-layer because of lateral *** the increase of the specimen thickness,both the interlaminar and intralaminar failures decrease as the impact damage mechanism changes from plate bending stress to the reflection of stress waves.

关键词： Carbon fiber reinforced plastics Failure analysis impact testing Lateral jetting Surface roughness Waterjet

来源：评论

学校读者我要写书评

暂无评论

Dynamic flexural strength of Aluminosilicate glass with a perspective of impulsive and quasi-impulsive responses: An experimental-numerical coupled evaluation

引用

Chinese Journal of Aeronautics 2024年第12期37卷 388-403页

作者： Muhammad Aamir RAZA Tao SUO Uzair Ahmed DAR Muhammad ATIF Muhammad Zakir SHEIKH School of Aeronautics and Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi’an 710072China Joint International Research Center of Impact Dynamics and Its Engineering Application Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Impact Dynamics and Engineering Application Northwestern Polytechnical UniversityXi’an 710072China National Key Laboratory of Strength and Structural Integrity Northwestern Polytechnical UniversityXi’an 710072China

The flexural strength of glass is a critical design parameter for applications encountering impact ***,the micro defects,specimen geometry,loading rate,and load transformation from a quasi-dynamic to quasi-impulsive state may influence the measurement *** to the stochastic and amorphous nature of the material,an accurate determination of the flexural strength remains a *** this two-fold study,a coupled experimental-numerical strategy was devised to evaluate the dynamic flexural *** the first phase,three-point bending experiments were conducted on a novel“Electromagnetic Split Hopkinson Pressure Bar(ESHPB)”.The incident stress signal and fracture time were recorded from experimental data,while the flexural strength was indirectly computed from a numerical algorithm.A quantitative comparison of the flexural strength with those in existing literature established the accuracy of the proposed *** of the study indicate that the specimen response became independent of the support conditions under impulsive *** being said,the specimen behaved like it had an infinite span length,and the measured flexural strength remained the same whether the specimen was supported or ***,the specimen also maintained contact at the interfaces of the incident bar and fixture supports for the entire loading *** the second part of this study,the computed flexural strength was used to calibrate the existing JH-2 *** prediction of the damage propagation corroborated with that obtained from reprography images,though *** work presents a precise and robust methodology to determine the dynamic flexural strength of brittle ceramics like Aluminosilicate glass over traditional experimental procedures to facilitate its adoption.

关键词： Dynamic flexural strength Damage mechanism Flexural fracture Numerical simulation Aluminosilicate glass

来源：评论

学校读者我要写书评

暂无评论

Cross-linked polyelectrolyte reinforced SnO_(2)electron transport layer for robust flexible perovskite solar cells

引用

Journal of Energy Chemistry 2023年第10期85卷 335-342,I0010页

作者： Zhihao Li Zhi Wan Chunmei Jia Meng Zhang Meihe Zhang Jiayi Xue Jianghua Shen Can Li Chao Zhang Zhen Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072ShaanxiChina Department of Aeronautical Structure Engineering School of AeronauticsNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application Joint International Research Laboratory of Impact Dynamics and Its Engineering ApplicationsXi’an 710072ShaanxiChina Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 519057GuangdongChina

SnO_(2)electron transport layer(ETL)is a vital component in perovskite solar cells(PSCs),due to its excellent photoelectric properties and facile fabrication *** this study,we synthesized a water-soluble and adhesive polyelectrolyte with ethanolamine(EA)and poly-acrylic acid(PAA).The linear PAA was crosslinked by EA,forming a 3D network that stabilized the SnO_(2)nanoparticle *** organic–inorganic hybrid ETL is developed by introducing the cross-linked PAA-EA into SnO_(2)ETL,which prevents nano particle agglomeration and facilitates uniform SnO_(2)film formation with fewer ***,the PAA-EA-modified SnO_(2)facilitated a uniform and compact perovskite film,enhancing the interface contact and carrier ***,the PAA-EA-modified PSCs exhibited excellent PCE of 24.34%and 22.88%with high reproducibility for areas of 0.045 and 1.00 cm~2,***,owing to structure reinforce effect of PAA-EA in SnO_(2)ETL,flexible device demonstrated an impressive PCE of 23.34%while maintaining 90.1%of the initial PCE after 10,000 bending cycles with a bending radius of 5 *** successful approach of polyelectrolyte reinforced hybrid organic–inorganic ETL displays great potential for flexible,large-area PSCs application.

关键词： Polyelectrolyte Cross-link Tin oxide Electron transfer layer Flexible solar cells

来源：评论

学校读者我要写书评

暂无评论

impact damage testing based on high-speed continuous water jet aircraft coatings

引用

Chinese Journal of Aeronautics 2024年第10期37卷 249-264页

作者： Minggong SHA Ying SUN Yutong LI Yiming LIU Gregory FEDOTENKOV Lev RABINSKIY Arseniy BABAYTSEV Yulong LI School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China Joint International Research Laboratory of Impact Dynamics and Engineering Application Xi’an 710072China Shaanxi Impact Dynamics and Engineering Application Laboratory Xi’an 710072China NPU Yangzi River Delta Research Institute Suzhou 215400China Moscow Aviation Institute(National Research University) Moscow 125993Russia

When an aircraft passes through a rainy area at high speed,the coating on the front edge of the fuselage will be continuously eroded by raindrops,causing the coating to wear,crack or even peel *** paper uses carbon fiber T300 material as the base material,and at the different impact speeds and impact numbers,water cutting equipment was used to simulate the erosion of the coating caused by the continuous impact of water *** damage morphology of samples at different damage stages was observed by digital microscope and Scanning Electron Microscope(SEM),and the damage evolution curve was established to analyze and reveal the damage behavior and damage mechanism of rain *** results show that the degree of damage experienced an increasing trend with the increase of impact numbers and speed,until circular peel damage was formed;no damage occurred during the incubation period,and the curvature of the damage evolution curve increased significantly after the expansion period and eventually showed a stable expansion *** mechanical properties of the coating material were the main influencing factors of its rain corrosion ***,the axially symmetric unsteady contact problem of droplets impacting the surface of a solid deformable body was *** the contact area was determined based on the iterative algorithm boundary positioning method.A mathematical model and closed mathematical formula describing the unsteady interaction between a droplet and a solid deformable obstacle were proposed.

关键词： Rain erosion damage Liquid-solid impact Multiple jets Composite materials impact dynamics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：