检索结果-内蒙古大学图书馆

3rd International Conference on Mechanical, Aerospace and Automotive Engineering (CMAAE 2023)

作者： Y. Zhou S. Zhu X. Xi College of aerospace engineering Nanjing university of aeronautics and astronautics Nanjing 210016 People's Republic of China Aviation key laboratory of science and technology on structures impact dynamics Aircraft strength research institute of China Xi'an 710065 People's Republic of China

ISBN: (数字)9781837240753

In order to study the crashworthiness of civil aircraft fuselage section in typical runway crash environments, this paper takes the metal fuselage structure of a typical civil aircraft as the research object. The environment models of the multi-layer structural runway, the off-runway soil and the rigid ground, and the structural model of the middle fuselage section of a certain type of civil aircraft were established. Furthermore, based on the simulation model, the effects of different ground environments on the fuselage section structural crashworthiness under the action of the vertical impact speed of 7m/s were studied by means of the finite element simulation method. The simulation results show that the mesh size of the ground environment has a significant effect on the calculation time; For asphalt concrete runway modeled based on the elastic layer theory, the thickness of the soil base is the key to the overall model dimensions; the multi-layer structural runway environment has a certain buffering effect on the structural collision process compared with the rigid surface environment; the surface icing runway environment has a smaller effect on the dynamic response of the fuselage section structure under vertical impact; while the off-runway soil environment has a stronger buffering effect, but it will change the way of energy absorption of the structure.

关键词：

来源：评论

学校读者我要写书评

暂无评论

The Experimental and Numerical Study of Aa6061-T6 Aluminum Alloy Under Repeated impacts

SSRN

引用

SSRN 2023年

作者： Wang, Binwen Qiu, Zhenguo Gao, Peng Xu, Yuzhao Wang, Changwei Han, Kangning Bai, Chunyu Yang, Qiang Zhu, Yaxin Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Aircraft Strength Research Institute of China Xi’an710065 China Zhuzhou Times New Material Technology Co. Ltd. Zhuzhou412007 China Department of Engineering Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Wuhan430074 China

In this study, we aimed to investigate the effect of repeated impact loading on the fatigue and failure behaviors of U-notched three-point bending AA6061-T6 specimens. After subjecting the specimens to different impact energies, we analyzed the fracture surfaces using SEM. Based on the fracture features, we selected the Gurson-Tvergaard-Needleman (GTN) model as the damage model for AA6061. Then, we established a numerical implementation of impact damage accumulation-based FEM simulation. By calibrating the parameters of the GTN model, we were able to achieve the impact progressions of U-notched three-point bending specimens under repeated impacts. As the repeated impact energy increases, the fracture surfaces transition from visible fatigue striations to abundant ductile microvoids. Comparison between the experimental tests and the numerical simulations of the U-notched three-point bending specimens reveals a high degree of consistency in terms of life and crack propagation for the repeated impacts with high impact energy. This demonstrates the good applicability of the GTN model in capturing the repeated impact behavior of AA6061 under high impact energy. Furthermore, the simulations indicate the specimen's notch experiences tension, compression, and reverse yield processes due to the rebound of the specimen in a single impact, reducing the damage accumulation during repeated impacts. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Development and global validation of a 1-week-old piglet head finite element model for impact simulations

引用

Chinese Journal of Traumatology 2023年第3期26卷 147-154页

作者： Zhong-Qing Su Da-Peng Li Rui Li Guang-Liang Wang Lang Liu Ya-Feng Wang Ya-Zhou Guo Zhi-Gang Li School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBejing100044China D epartment of NeurosurgeryBejing Children's Hospital CapitalMedical University.National CenterforChildren'sHealthBeijing 100045China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics China Aircraft Strength Research InstituteXi'an70065China

Purpose:Child head injury under impact scenarios(***,vehicle crashes,etc.)is an important topic in the field of injury *** head of piglet was commonly used as the surrogate to investigate the biomechanical response and mechanisms of pediatric head injuries because of the similar cellular structures and material ***,up to date,piglet head models with accurate geometry and material properties,which have been validated by impact experiments,are *** aim to develop such a model for future ***:In this study,first,the detailed anatomical structures of the piglet head,including the skull,suture,brain,pia mater,dura mater,cerebrospinal fluid,scalp and soft tissue,were constructed based on CT ***,a structured butterfly method was adopted to mesh the complex geometries of the piglet head to generate high-quality elements and each component was assigned corresponding constitutive material ***,the guided drop tower tests were conducted and the force-time histories were ectracted to validate the piglet head finite element ***:Simulations were conducted on the developed finite element model under impact conditions and the simulation results were compared with the experimental data from the guided drop tower tests and the published *** average peak force and duration of the guide drop tower test were similar to that of the simulation,with an error below 10%.The inaccuracy was below 20%.The average peak force and duration reported in the literature were comparable to those of the simulation,with the exception of the duration for an impact energy of 11 *** results showed that the model was capable to capture the response of the pig ***:This study can provide an effective tool for investigating child head injury mechanisms and protection strategies under impact loading conditions.

关键词： Piglet head Finite element model Dynamic response Validation Drop tower tests

来源：评论

学校读者我要写书评

暂无评论

Damage Probability Analysis of Armor Structure with Multiple Damage Modes under Fragment Penetration

引用

science technology and Engineering 2024年第36期24卷 15447-15456页

作者： Ding, Ming Liu, Yong-Shou Zhang, Yu Bai, Chun-Yu Yang, Qiang Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Aircraft Strength Research Institute of China Xi'an710065 China School of Mechanics and Civil Engineering Northwestern Polytechnical University Xi'an710072 China

The armored structure is exposed to the outside of the target in the combat environment and becomes the primary target of fragmentation. In order to study the multi-mode damage caused by fragmentation, a set of multi-mode damage probability calculation and analysis method was established based on the armored structure penetrated by fragmentation. Based on LS-DYNA simulation calculation, each damage mode was analyzed and the threshold point was determined, and the armor structure damage simulation phase diagram with speed and angle as two-dimensional input variables was drawn. The intersection problem of fragments and armor structure was solved based on the calculation of the intersection point of ray and plane. The solution result was input into the damage simulation phase diagram as input variable, and the output result of the damage simulation phase diagram was used as the criterion of each damage mode. The damage probability of each damage mode under fragment penetration of armor structure was calculated by Monte Carlo method, and the damage probability curve was established. The visual output platform was built and the multi-mode damage cloud image was obtained according to the experimental matrix calculation. The results show that three damage modes, ricochet, penetration and penetration, can be formed when the fragments hit the armor structure at different speeds and angles. The program can calculate the damage probability of each damage mode and output the damage cloud map. © 2024 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Monte Carlo methods

来源：评论

学校读者我要写书评

暂无评论

impact of Crash Environments on Crashworthiness of Fuselage Section

引用

Transactions of Nanjing University of Aeronautics and Astronautics 2022年第S01期39卷 1-8页

作者： TANG Huan ZHU Shuhua LIU Xiaochuan XI Xulong College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Aircraft Strength Research Institute of ChinaXi’an 710065P.R.China

In order to study the crash resistance of the civil aircraft structure in different crash environments,two environmental models of soft soil and water are established to analyze the dynamic response of the fuselage section subjected to the vertical at the impact velocity of 7 m/*** results show that the soft crash environment can have a certain cushioning effect on the structure crash,but it will prolong the crash time and change the energy absorption *** work suggests that soft environment may not be suitable for forced landing.

关键词： crashworthiness dynamic response fuselage section soft soil water

来源：评论

学校读者我要写书评

暂无评论

Experimental Study on Hysteresis Characteristics of Fluorosilicone Rubber Damper

引用

IOP Conference Series: Materials science and Engineering 2020年第1期887卷

作者： Qiang Yang Yunlai Zhou Aircraft strength Research Institute of China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Xi'an China710065 Faculty of Engineering Lusofona University Campo Grande 376 1749-024 Lisboa Portugal

This study tested the hysteresis characteristics of the damper for determining the damping characteristics. Firstly, dampers with four kinds of hardness, such as 20HA, 30HA, 40HA and 50HA, were obtained by vulcanization. Then hysteresis loops of the dampers were tested by cyclic loading method with displacement of ±0.5mm, ±1.0mm and ±1.2mm. The relationship between stiffness of dampers and hardness was obtained, and it was found that the stiffness of dampers changed quadratically with rubber hardness. The ellipse method is used to calculate the damping factor of the damper. The damping factor of the damper varies with the change of loading displacement and rubber hardness.

关键词：

来源：评论

学校读者我要写书评

暂无评论

On design of stiffened 3D-multi-cell for enhancing the vehicle crashworthiness and occupant safety 27th

On design of stiffened 3D-multi-cell for enhancing the vehic...

引用

27th European Safety and Reliability Conference, ESREL 2017

作者： Zahran, M.S. Xue, P. Esa, M.S. Bai, C.Y. Su, G.L. School of Aeronautics Northwestern Polytechnical University Xi’an China Aircraft Strength Research Institute Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics Xi’an China

ISBN: (纸本)9781138629370

State-of-the-art studies of vehicles’ crashworthiness reveal various methods to enhance the crashworthiness characteristics and increase the safety levels. One method that has been studied and applied to achieve the safety of vehicles is using multi-cell thin-walled structures due to their excellent energy absorption capacity with lightweight. Therefore, in the current paper, a new configuration of multi-cell structure (stiffened 3D-multi-cell) has been proposed for designing an efficient energy absorbing structure by performing a new arrangement of the internal webs and dividing them into two layers with a different angle of orientation, and internal lateral bulkhead is added between the upper and the lower layers. The comparison of the crashworthiness characteristics of the newly proposed configuration (stiffened 3D-multi-cell), the single-cell (SCYL), conventional multi-cell (QCYL), and 3D-multi-cell thin-walled circular tube (3D-QCYL) is carried out using the non-linear finite element code ANSYS-WORKBENCH/LS-DYNA. The numerical results show that the newly proposed stiffened 3D-multi-cell can achieve a significant improvement in the absorbed energy, the specific energy absorption, and the crush force efficiency in comparison with model SCYL, model QCYL and model 3D-QCYL. Finally, it can be concluded that reinforcing the 3D-multi-cell with internal lateral bulkhead implies a significant improvement for the crashworthiness. The reason for this improved behavior is the effect of adding the internal lateral bulkhead which increases the stiffness of the crush absorber during the plastic deformation process. © 2017 Taylor & Francis Group, London.

关键词： Crashworthiness

来源：评论

学校读者我要写书评

暂无评论

The experimental study of cotton fiber reinforced ice impact on stringer-stiffed composite panels

The experimental study of cotton fiber reinforced ice impact...

引用

第二十一届国际复合材料大会

作者： Wang Jizhen Aircraft Strength Research Institute of China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics

Composite materials have been widely used in the new commercial airliners. During the flight, airliner’s skin may be exposed to hailstone, causing structural damage and destruction, and endangering passengers’safety. Current studies show that nature hail is less dense and tougher than clear ice, and cotton fibers are required to add to the simulated hail ice(SHI) according to

关键词： The experimental study of cotton fiber reinforced ice impact on stringer-stiffed composite panels

来源：评论

学校读者我要写书评

暂无评论

The experimental study of cotton fiber reinforced ice impact on stringer-stiffed composite panels

The experimental study of cotton fiber reinforced ice impact...

引用

第三届中国国际复合材料科技大会

作者： Wang Jizhen Aircraft Strength Research Institute of China Aviation Key Laboratory of Science and Technology on Structures Impact Dynamics

To obtain the dynamic behavior and damage properties of simulated hail ice（SHI） impacts on stringer-stiffed composite panels, two aspects of experimental studies were conducted, i.e. SHI impacts tests on the rigid surface and SHI impacts tests on stringer-stiffed panels. SHI impacts on the rigid surface were tested to study the dynamic mechanical properties of clear ice（clear-SHI） and cotton fiber reinforced ice（cotton-SHI）. And the effect of the initial velocity of the SHI to impact load were studied. Then, cotton-SHI impacts on stringer-stiffed panels were tested by different velocity to study the delamination damage property of these panels. According to the C-scan results of the impacted panels, delamination damage with varied shape and size were found for the cotton-SHI impacts, while nearly no damage was found for clearSHI impacts. Especially to deserve to be mentioned, the damage shape and delamination area failed to show a clear law with the increase of the impact velocity.

关键词： simulated hail ice stringer-stiffed composite panels cotton-SHI impact tests delamination damage property

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：