检索结果-内蒙古大学图书馆

Theoretical prediction for effective properties and progressive failure of textile composites:a generalized multi-scale approach

引用

Acta Mechanica Sinica 2021年第8期37卷 1222-1244,I0001页

作者： Haoyuan Dang Peng Liu Yinxiao Zhang Zhenqiang Zhao Liyong Tong Chao Zhang Yulong Li Department of Aeronautical Structure Engineering Northwestern Polytechnical UniversityXi’an 710072 China 2 Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710072 China 3 Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710072 China 4 School of Science Harbin Institute of TechnologyShenzhen 518055 China 5 School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia

A generalized analytical model is developed to predict progressive failure behavior of several types of textile composites,including plain weave composites,twill weave composites,two-dimensional tri-axially braided composites and warpreinforced 2.5-dimensional braided *** this model,the unit cell(UC)of composite is firstly identified and reconstructed into a refined lamina structure with multiple equivalent lamina elements(ELEs)based on apt geometrical approximation and ***,two-way coupled stress-strain responses within the UC(macro-scale)and ELE(meso-scale)are established through a universal series-parallel model(SPM).Finally,a progressive damage model,which consists of damage initiation criteria and a stiffness evolution strategy,is employed to predict damage behavior of the *** analytical results including mechanical properties and progressive failure process are validated against the existing numerical and experimental ones in *** validated analytical model is then used to study the effects of global fiber volume fraction,braided angle,shear failure coefficient and selected failure criteria on stiffness,strength and failure *** present results demonstrate the efficiency and generic capability of the present analytical model for predicting the mechanical responses of a range of textile composites.

关键词： Textile composites Analytical model Series-parallel model Damage mechanics Strength

来源：评论

学校读者我要写书评

暂无评论

Structural Integrity Analyses on the Anti-high Overload of a Solid Rocket Motor 29th

Structural Integrity Analyses on the Anti-high Overload of a...

引用

29th International Conference on Computational and Experimental engineering and Sciences, ICCES 2023

作者： Du, Wenxuan Deng, Qiong Tian, Xiaotao Yin, Jianping Hu, Bowen Wang, Yongshuai He, He Miao, Yinggang Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application School of Aeronautics Northwestern Polytechnical University Shaanxi Xi’an710072 China Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications School of Aeronautics Northwestern Polytechnical University Shaanxi Xi’an710072 China Science and Technology on Combustion and Explosion Laboratory Xi’an Modern Chemistry Research Institute Shaanxi Xi’an710065 China

ISBN: (纸本)9783031425141

Solid propellant works as the most key component for solid rocket motors, and its mechanical behaviors paly a dominant role in the structural integrity of the motor. As typical viscoelastic material, it presents a strong rate-dependence, which would affect the integrity behavior. In the present work, a solid propellant was performed for its constitutive behaviors under wide strain rate loading from 30 to 3000 s−1 using the developed split Hopkinson bar apparatus. A linear viscoelastic constitutive model was then established for carrying out the finite element analysis of an engine structure. As indicated from the simulation results, the possible failure zones in solid rocket motor are revealed, and some stress concentrations localizes in its middle and rear section of the coating layer. Grain failures tend to occur in the concave turning points between the grain rear end and the cushion. The effect of high overload was also analyzed under various cushions, and it was also found that the cushions facilitate the integrity by absorbing energy and confining the deformation of the grain. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Strain rate

来源：评论

学校读者我要写书评

暂无评论

Energy Absorption Characteristics of Triply Periodic Minimal Surface Lattices 2

Energy Absorption Characteristics of Triply Periodic Minimal...

引用

2023 2nd International Conference on Applied Mechanics and Advanced Materials, ICAMAM 2023

作者： Wang, Haodong Li, Siqi Wang, Cunxian Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications School of Aeronautics Northwestern Polytechnical University Shaanxi Xi'an710072 China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Application School of Aeronautics Northwestern Polytechnical University Shaanxi Xi'an710072 China School of Engineering Heilongjiang Bayi Agricultural University Heilongjiang Da'qing163000 China

Historically, structural equipment has been studied to determine the impact and protection of its components, and common energy-absorbing materials include honeycomb, foam, bellows, and expansion tubes. According to related analyses, topological metamaterial structures designed based on mathematically known non-self-intersecting three-periodic minimal surfaces (TPMS) may possess superior mechanical properties. It is demonstrated in this study that a solid structure with a TPMS of 10 mm × 10 mm × 10 mm is constructed based on the Schwarz Primitive surface. Analyses were conducted on the effects of element type and modeling conditions on simulation results. Based on the simulation results, the solid element exhibited better analysis accuracy than the shell element. The structure had a better energy absorption capability when its surface thickness was set at approximately 1.31 mm. © Published under licence by IOP Publishing Ltd.

关键词： Energy absorption

来源：评论

学校读者我要写书评

暂无评论

HIGH impact AND DAMAGE TOLERANT MULTICOMPONENT ALLOY FOR HIGH STRAIN RATE applicationS 33

HIGH IMPACT AND DAMAGE TOLERANT MULTICOMPONENT ALLOY FOR HIG...

引用

33rd Congress of the International Council of the Aeronautical Sciences, ICAS 2022

作者： Atif, Muhammad Shi, XianZhe Raza, Muhammad Amir Sheikh, Muhammad Zakir Shen, Jianghua Li, Yulong School of Aeronautics Institute of Extreme Mechanics Northwestern Polytechnical University Shaanxi Xi'an710072 China Joint International Research Center of Impact Dynamics and Its Engineering Application Japan Shaanxi Key Laboratory of Impact Dynamics and its Engineering Applications Shaanxi Xi'an710072 China School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi'an710072 China

ISBN: (纸本)9781713871163

The modern transportation sector, including aerospace and defense, demand advanced materials with extraordinary properties to make the service structures more durable and safer. The aforesaid applications involve high-velocity impact and strain rate situations, in which structures may be subjected to radically different loading circumstances than their static equivalents. A new era of materials, namely multicomponent alloys that deviate from the conventional alloying strategy, is expected to replace traditional materials in future engineering applications. The reasons for this specific and notable commitment are their exceptional mechanical performance at room, high, and cryogenic temperatures. These alloys provide a consortium of properties that can outclass many materials currently in use. Such an alloy, namely Cantor alloy, an equiatomic, five-element material system CoNiFeMnCr has been tested under low and high strain rates. A remarkable elevated yield strength of 70% as compared to static loading, with high strain rate sensitivity and work hardening, is observed without fracture. This alloy's outstanding impact resistance makes it a prime contender for shock absorption and damage tolerant applications. The higher strength contribution at dynamic testing is linked to the profound effect of dislocation-mediated microstructural manifestation. The study also provides insights into a novel high strain rate method to evaluate impact-related problems in a precise, more versatile manner. © (2022) by International Council of Aeronautical Sciences (ICAS) All rights reserved.

关键词： Strain rate

来源：评论

学校读者我要写书评

暂无评论

A machine learning-based data-driven approach for modelling anisotropic and tension-compression asymmetry behavior of elastoplastic materials using limited anisotropic experiment data

引用

European Journal of Mechanics - A/Solids 2025年

作者： Xin Li Yejie Qiao Yang Chen Chunlin Du Ziqi Li Chao Zhang School of Aeronautics Northwestern Polytechnical University Xi’an Shaanxi 710072 China Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications Northwestern Polytechnical University Xi’an Shaanxi 710072 China School of Civil Aviation Northwestern Polytechnical University Xi’an Shaanxi 710072 China Research & Development Institute of Northwestern Polytechnical University in Shenzhen Northwestern Polytechnical University Shenzhen Guangdong 518063 China

Machine learning (ML)-based data-driven methods offer efficient approaches to characterize the anisotropic behavior of elastoplastic materials. This paper proposes a ML-based data-driven approach to model anisotropic and tension-compression asymmetry (TCA) behavior using ML techniques and limited anisotropic experimental data. To improve the predictive capability under unknown large deformations, two separate artificial neural network (ANN) models are employed within this modelling framework. Firstly, an enhanced data-driven constitutive model constructed using an ANN model, is utilized to characterize the mechanical behavior under tension loading along the rolled direction. This characterization forms the foundation for calculating the anisotropic factor. Secondly, another ANN model is used to learn the relationship between this anisotropic factor and stress components, enabling modeling of elastoplastic anisotropic and TCA behavior. Additionally, to address the challenge posed by limited available anisotropic experimental data, Hermite interpolation method is used to enrich the training dataset. For numerical implementation, a stress-updating algorithm based on the isotropic hardening assumption is introduced. Finally, to validate the proposed anisotropic data-driven approach, it is applied to predict the anisotropic and TCA behavior of the 2024-T351 aluminum alloy. The predictions are compared with those obtained from the Barlat model. The investigation results show that, the proposed anisotropic data-driven approach effectively captures the evolution of anisotropic and TCA characteristics during the plastic deformation process.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An in-situ study of static recrystallization in Mg using high temperature EBSD

引用

Journal of Magnesium and Alloys 2024年第4期12卷 1419-1430页

作者： Xu Ye Zhe Suo Zhonghao Heng Biao Chen Qiuming Wei Junko Umeda Katsuyoshi Kondoh Jianghua Shen School of Aeronautics Northwestern Polytechnical UniversityXi’anShaanxiChina Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application Xi’anShaanxiChina School of Mechanical Engineering Qinghai UniversityXiningQinghaiChina School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’anShaanxiChina Department of Mechanical Engineering University of North Carolina at CharlotteCharlotteNCUSA Joining and Welding Research Institute Osaka University11-1 MihogaokaOsakaJapan

It has been a common method to improve the mechanical properties of metals by manipulating their microstructures via static recrystallization,i.e.,through heat ***,the knowledge of recrystallization and grain growth is critical to the success of the *** the present work,by using in-situ high temperature EBSD,the mechanisms that control recrystallization and grain growth of an extruded pure Mg were *** experimental results revealed that the grains of priority for dynamic recrystallization exhibit fading competitiveness under static *** is also found that grain boundary movement or grain growth is likely to show an inverse energy gradient effect,i.e.,low energy grains tend to swallow or grow into high energy grains,and grain boundaries of close to 30°exhibit superior growth advantage to *** finding is that{10-12}tensile twin boundaries are sites of hardly observed for recrystallization,and are finally swallowed by adjacent recrystallized *** above findings may give comprehensive insights of static recrystallization and grain growth of Mg,and may guide the design of advanced materials processing in microstructural engineering.

关键词： Pure Mg In-situ HT-EBSD Recrystallization Grain growth

来源：评论

学校读者我要写书评

暂无评论

DYNAMIC RESPONSE AND DAMAGE OF THE FAN BLADES DURING UAV INGESTION INTO AN AERO-ENGINE 32

DYNAMIC RESPONSE AND DAMAGE OF THE FAN BLADES DURING UAV ING...

引用

32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021

作者： Hou, Naidan Meng, Xianghao Liu, Jun Li, Yulong School of Aeronautics Northwestern Polytechnical Univ. No. 127 Youyi West Rd. Shaanxi Xi'an710072 China Joint International Research Laboratory of Impact Dynamics and its Engineering Applications Northwestern Polytechnical University Shaanxi Xi'an710072 China Shaanxi Key Laboratory of Impact Dynamics and Engineering Application Xi'an China School of Civil Aviation Northwestern Polytechnical University Suzhou China

ISBN: (纸本)9783932182914

Based on the potential risk of a drone striking on an aircraft, a numerical model is established on the finite element analysis software PAM-CRASH version 8.6 to simulate the collision between a small drone and full-scale fan blades of a typical turbofan engine. Parameter studies are performed on the impact orientation, location and kinetic energy, and all are proved to have different levels of effects on the fan's dynamic response. In order to investigate the different damage mechanics of hard and soft impact, a comparative study is also conducted between the bird and the Unmanned aerial vehicle (UAV) ingestion with the same impact energy. Results showed that the damage and failure of the fan blades induced by UAV collision is more intense than that by bird strike due to its features of local stress concentration and material failure. The research results provide a reference for the revision of the airworthiness standards for small drones and the exploration of the test research of UAV airborne collision. © 2021 32nd Congress of the International Council of the Aeronautical Sciences, ICAS 2021. All rights reserved.

关键词： Numerical models

来源：评论

学校读者我要写书评

暂无评论

Efect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading

引用

Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 127-132页

作者： Minjie Wang Jianghua Shen Biao Chen Umeda Junko Katsuyoshi Kondoh Yulong Li School of Aeronautics Northwestern Polytechnical UniversityXi’an 710000China Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application Xi’an 710000China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710000China Joining and Welding Research Institute Osaka University11-1 MihogaokaOsaka 567-0047Japan School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710000China Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710000China

In this study,stress relaxation compression tests were performed to investigate the strain rate sensitivity,activation volume and mobile dislocations in carbon nanotubes/aluminum(CNTs/Al)*** results reveal that,with the addition of CNTs,the strain rate sensitivity of CNTs/Al ***,a smaller V*of CNTs/Al compared with pure Al was attributed mainly to the CNT-Al interfaces and partly to the increased forest dislocations cutting activities in grain interior,which was related to the tendency of short ranges order formation during plastic *** incorporation of CNTs also improved the dislocation storage capability and reduced the dislocation velocity,leading to a lower mobile dislocation exhaustion rate.

关键词： Metal matrix composites Carbon nanotubes Strain rate sensitivity Activation volume Dislocations exhaustion

来源：评论

学校读者我要写书评

暂无评论

Study on low-velocity impact behavior and residual performance prediction of CFRP T-joints 34th

Study on low-velocity impact behavior and residual performan...

引用

34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024

作者： Zhou, Jianwu Zhang, Chao School of Aeronautics Northwestern Polytechnical University Shaanxi Xi’an710072 China School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi’an710072 China Joint International Research Laboratory of Impact Dynamics and Its Engineering Application Shaanxi Xi’an710072 China

Composite T-joints are highly susceptible to low-velocity impact, which can significantly affect their residual performance due to the primary working condition of bearing out-of-plane tensile loads. Currently, most methods that employ multiple models or analytical steps to sequentially assess the mechanical properties of composites generally exhibit certain limitations, leaving room for improvement. This study has developed a finite element (FE) model to simulate the low-velocity impact and post-impact tensile behaviors of carbon fiber reinforced polymers (CFRP) T-joints using an integrated analysis method. The model is based on stress failure criteria and continuous stiffness degradation theory and incorporates corrections to the damage variables. Both the low-velocity impact and quasi-static tensile portions of the model are implemented using an explicit solver with the VUMAT subroutine for calculations in Abaqus. The element damage states are transferred between the two models via a Python script, mitigating the inefficiencies and uncontrollable errors associated with the traditional method of transferring element information between multiple models or analytical steps. Finally, the numerical results of mechanical response and damage states are compared with experimental findings from various perspectives. The results show that the model exhibits a maximum error of 10.41% in the main key parameters during low-velocity impact and a maximum error of 10.30% in the ultimate load during post-impact tension. The model’s delamination damage state and final tensile failure mode closely align with the experimental results. © 2024, International Council of the Aeronautical Sciences. All rights reserved.

关键词： ABAQUS

来源：评论

学校读者我要写书评

暂无评论

Modeling the temperature-rise behavior of 2D triaxial braided composites under impact loads 34th

Modeling the temperature-rise behavior of 2D triaxial braide...

引用

34th Congress of the International Council of the Aeronautical Sciences, ICAS 2024

作者： Zhang, Chao Liu, Peng Li, Yulong School of Aeronautics Northwestern Polytechnical University Shaanxi Xi’an710072 China School of Civil Aviation Northwestern Polytechnical University Shaanxi Xi’an710072 China Joint International Research Laboratory of Impact Dynamics and Its Engineering Application Shaanxi Xi’an710072 China

Due to their special geometric structure, the damage evolution and crack propagation behavior of twodimensional triaxially braided composite (2DTBC) is complicated and unique. In addition, under high-speed impact loads, the adiabatic heating-induced temperature rise may cause a phase change in the resin material. Therefore, the damage and failure behavior of 2DTBC under impact load is considered to be a dynamic and thermo-mechanical coupled problem. It is then necessary to develop an appropriate numerical method that is able to capture the temperature rise behavior of 2DTBC under various loading conditions. This study introduces infrared thermal imaging, quasi-static, low-velocity impact, and high-speed impact tests to measure the thermal response of the material during different loading conditions. Through the comparison against geometric configuration and full-field strain distribution images, the correlation between temperature-rise behavior with deformation and damage are systematically analyzed. An elastoplastic progressive damage constitutive model for fiber bundle was established with consideration of strain-rate dependency and thermal-mechanical coupling. A meso-scale finite element (FE) model for 2DTBC was developed to model the quasi-static and impact failure behaviors. Combing the experimental and simulation results, the temperature-rise behavior was clarified and the rate-dependent damage mechanism was revealed. The accuracy and applicability of the FE model were validated. The research results can provide theoretical basis and modeling tool for the practical application of this type of composites. © 2024, International Council of the Aeronautical Sciences. All rights reserved.

关键词： Strain rate

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：