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Simultaneously enhanced interfacial shear strength and Tensile strength of heterocyclic aramid fiber by graphene oxide

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Nano Research 2023年第10期16卷 12286-12293页

作者： Ziyi Zhang Xiangzheng Jia Chun Li Lanying Li Yeye Wen Zhenfei Gao Jiangwei Zhang Enlai Gao Kun Jiao Jin Zhang College of Science China University of Petroleum(Beijing)Beijing 102249China Beijing National Laboratory for Molecular Sciences School of Materials Science and EngineeringCollege of Chemistry and Molecular EngineeringBeijing Science and Engineering Center for NanocarbonsPeking UniversityBeijing 100871China Beijing Graphene Institute(BGI) Beijing 100095China Department of Engineering Mechanics School of Civil EngineeringWuhan UniversityWuhan 430072China China Bluestar Chengrand Chemical Co. Ltd.Chengdu 610041China Science Center of Energy Material and Chemistry College of Chemistry and Chemical EngineeringInner Mongolia UniversityHohhot 010021China

Heterocyclic aramid fibers,a typical kind of high-performance fibers,have been widely used in aerospace and protection fields because of their excellent mechanical properties.However,the application of heterocyclic aramid fibers as a reinforcement is hindered by the weak interfacial combination with matrix materials,especially epoxy.Traditional strategies enhancing the interfacial shear strength(IFSS)usually decrease the Tensile strength.Therefore,simultaneous enhancement of both mechanical properties remains a challenge.Herein,we report a novel heterocyclic aramid fiber with high interfacial shear strength(49.3 MPa)and Tensile strength(6.27 GPa),in which 4,4′-diamino-2′-chlorobenzanilide(DABA-Cl)and a small amount of graphene oxide(GO)are introduced through in-situ polymerization.Hydrogen bonds andπ–πinteraction between GO and polymer chains trigger the enhancement in crystallinity,orientation,and lateral interaction of the fibers,thus improving the Tensile strength and interfacial shear strength of the fibers.Moreover,the interfacial interaction between fiber and epoxy is enhanced due to the improvement of the surface polarity of the fibers caused by DABA-Cl.Therefore,a method to improve both Tensile strength and interfacial shear strength of heterocyclic aramid fibers was found by introducing GO and DABA-Cl,which may provide guidance for the design and preparation of other high-performance fibers.

关键词： heterocyclic aramid fibers graphene oxide(GO) 4 4′-diamino-2′-chlorobenzanilide(DABA-Cl) interfacial shear strength Tensile strength

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Machine Learning-Based Research on Tensile strength of SiC-Reinforced Magnesium Matrix Composites via Stir Casting

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Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 453-466页

作者： Zhihong Zhu Wenhang Ning Xuanyang Niu Yuhong Zhao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Collaborative Innovation Center of Ministry of Education and Shanxi Province for High-Performance Al/Mg Alloy MaterialsNorth University of ChinaTaiyuan 030051China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

SiC is the most common reinforcement in magnesium matrix composites,and the Tensile strength of SiC-reinforced magnesium matrix composites is closely related to the distribution of SiC.Achieving a uniform distribution of SiC requires fine control over the parameters of SiC and the processing and preparation process.However,due to the numerous adjustable parameters,using traditional experimental methods requires a considerable amount of experimentation to obtain a uniformly distributed composite material.Therefore,this study adopts a machine learning approach to explore the Tensile strength of SiC-reinforced magnesium matrix composites in the mechanical stirring casting process.By analyzing the influence of SiC parameters and processing parameters on composite material performance,we have established an effective predictive model.Furthermore,six different machine learning regression models have been developed to predict the Tensile strength of SiC-reinforced magnesium matrix composites.Through validation and comparison,our models demonstrate good accuracy and reliability in predicting the Tensile strength of the composite material.The research findings indicate that hot extrusion treatment,SiC content,and stirring time have a significant impact on the Tensile strength.

关键词： Machine learning Stirring casting Magnesium matrix composite Tensile strength

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High Tensile strength and Superelasticity of Directionally Solidified Ti_(30)Ni_(30)Fe_(10)Hf_(10)Nb_(20) Eutectic High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1583-1590页

作者： Huan Li Shuai Zeng Yong-Kang Zhou Hai-Long Li Hong-Wei Zhang Hai-Feng Zhang Zheng-Wang Zhu Shi-Changxu Innovation Center for Advanced MaterialsInstitute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

Superelasticity has been widely used in various fields.High elastic limit simultaneously with large superelasticity is urgent in the critical applications.In this study,we have employed the high entropy alloy(HEA)concept to develop a new TiHfNiFe-Nb eutectic HEA(EHEA)based on the TiNi-Nb eutectic alloy.The results show the directional catkin-like microstructure with the fiber eutectic in the center and the lamella eutectic in the outside form along the directional solidification direction when the growth rate is 60 mm/h.The corresponding specimens display the high strength of 1409 MPa and superelasticity of 3.1%in tension at room temperature,which is attributed to the synergetic effect of high entropy,preferred orientation,ordered body-centered cubic(B2)phase and disordered body-centered cubic phase in the eutectic structure.This work sheds light on designing the high-performance superelastic function materials with EHEAs.

关键词： High-entropy alloy Eutectic alloy Directional solidification Superelasticity Tensile strength

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The Effect of Internal Delamination Damage on the Tensile strength of Aeronautical Composites

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Acta Mechanica Solida Sinica 2022年第6期35卷 979-986页

作者： Qiang Wang Qiuyu Chen Yujie Chen Jiandong Li Qun Li School of Equipment Management and Unmanned Aerial Vehicle Engineering Air Force Engineering UniversityXi’an710051China State Key Laboratory for strength and Vibration of Mechanical Structures School of AerospaceXi’an Jiaotong UniversityXi’an710049China School of Air and Missile Defence Air Force Engineering UniversityXi’an710051China

For aeronautical composite materials,the appearance of internal delamination has a fatal impact on their mechanical properties and may even seriously threaten aircraft flight safety.In this study,the effect of internal delamination damage with different sizes and depths on the Tensile strength of aeronautical composites was investigated.Firstly,based on carbon-fiber-reinforced composites commonly used in aircraft,laminate specimens with internal delamination damages of different depths and diameters were fabricated,and tensile tests of composite materials were carried out.Then,the finite element model for the carbon-fiber-reinforced laminate specimens was established,and the validity of the model was verified by comparing its simulation results with the experimental data.Furthermore,by changing the geometric parameters of the internal delamination damage model,the influence of delamination damage on the Tensile strength of carbon-fiber-reinforced composites was analyzed and summarized.The results show that,on the one hand,for the internal delamination damages of the same area,the closer is the delamination damage to the surface layer,the lower is the Tensile strength.In particular,the closer is the delamination damage to the surface layer,the greater is the decrease in Tensile strength,which exhibits an obvious nonlinear relationship.On the other hand,for the internal delamination defects of the same depth,the difference in delamination area has little effect on the Tensile strength.This law provides a reference for the damage detection and maintenance focus of aeronautical composite structures,which is of great significance to ensure the safe use of aeronautical composites.

关键词： Aeronautical composites Carbon fiber laminate Delamination damage Tensile strength Finite element simulation

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A simple method for determining independent fracture toughness and Tensile strength of rock

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International Journal of Mining Science and Technology 2022年第4期32卷 707-726页

作者： Junfeng Guan Yulong Zhang Jiangfeng Meng Xianhua Yao Lielie Li Shuanghua He School of Civil Engineering and Communication North China University of Water Resources and Electric PowerZhengzhou 450045China State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China

This paper develops a model that only requires two sets of small-size rock specimens with the ratio of the structural geometry parameter maximum to minimum ae,max:ae,min≥3:1 to determine the rock fracture and strength parameters without size effect and predict the actual structural performance of rock.Regardless of three-point-bending,four-point-bending,or a combination of the above two specimen types,fracture toughness KICand Tensile strength ftof rock were determined using only two sets of specimens with ae,max:ae,min≥3:1.The values KICand ftwere consistent with those determined using multiple sets of specimens.The full structural failure curve constructed by two sets of small-size specimens with ae,max:ae,min≥3:1 can accurately predict large-size specimens fracture failure,and±10%upper and lower limits of the curve can encompass the test results of large-size specimens.The peak load prediction curve was constructed by two sets of specimens with ae,max:ae,min≥3:1,and±15%upper and lower limits of the peak load prediction curve can cover the small-size specimen tests data.The model and method proposed in this paper require only two sets of small-size specimens,and their selection is unaffected by the specimen type,geometry,and initial crack length.

关键词： Rock Size effect Boundary effect Structural geometry parameter Fracture toughness Tensile strength

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Effect of the mineral spatial distribution heterogeneity on the Tensile strength of granite:Insights from PFC3D-GBM numerical analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1144-1160页

作者： Tao Zhang Liyuan Yu Yuxuan Peng Hongwen Jing Haijian Su Jiangbo Wei State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China College of Geology and Environment Xi’an University of Science and TechnologyXi’an710054China

The mechanical characteristics of crystalline rocks are affected by the heterogeneity of the spatial distribution of minerals.In this paper,a novel three-dimensional(3D)grain-based model(GBM)based on particle flow code(PFC),i.e.PFC3D-GBM,is proposed.This model can accomplish the grouping of mineral grains at the 3D scale and then filling them.Then,the effect of the position distribution,geometric size,and volume composite of mineral grains on the cracking behaviour and macroscopic properties of granite are examined by conducting Brazilian splitting tests.The numerical results show that when an external load is applied to a sample,force chains will form around each contact,and the orientation distribution of the force chains is uniform,which is independent of the external load level.Furthermore,the number of high-strength force chains is proportional to the external load level,and the main orientation distribution is consistent with the external loading direction.The main orientation of the cracks is vertical to that of the high-strength force chains.The geometric size of the mineral grains controls the mechanical behaviours.As the average grain size increases,the number of transgranular contacts with higher bonding strength in the region connecting both loading points increases.The number of high-strength force chains increases,leading to an increase in the stress concentration value required for the macroscopic failure of the sample.Due to the highest bonding strength,the generation of transgranular cracks in quartz requires a higher concentrated stress value.With increasing volume composition of quartz,the number of transgranular cracks in quartz distributed in the region connecting both loading points increases,which requires many high-strength force chains.The load level rises,leading to an increase in the Tensile strength of the numerical sample.

关键词： Rock mechanics Tensile strength Spatial distribution of minerals Three-dimensional(3D)grain-based model (GBM) Transgranular contact

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Effects of minor B additions on Tensile strength, fracture toughness and oxidation resistance of Nb–Si based alloys

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Progress in Natural Science:Materials International 2022年第2期32卷 248-258页

作者： Guangxin Sun Lina Jia Yu Wang Zuheng Jin Hu Zhang School of Materials Science and Engineering Beihang University

The effects of minor additions of B on microstructure,ambient Tensile strength,fracture toughness and hightemperature oxidation resistance of Nb-Si based alloys were investigated.The added contents were designed as 0.05,0.10 and 0.20 at.%.The results show constituent phases in 0.05 B and 0.20 B alloys were Nbss,α-NbSi;while only 0.10 B alloy consisted of γ-NbSi.Minor B was prioritized into Nbss and redundant one dissolved into silicide enhanced volume fraction of the silicide.With increasing concentrations of boron,the microstructure was refined at first and then coarsened,while the Tensile strength was enhanced remarkably.Compared with other two alloys,the 0.10 B alloy containing γ-NbSishows both the best fracture toughness and oxidation resistance.The important roles of γ-NbSiin balancing overall properties are emphasized.

关键词： Nb-Si based Alloys Directional solidification Tensile strength Fracture toughness Oxidation resistance

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Root Tensile strength of terrace hedgerow plants in the karst trough valleys of SW China:Relation with root morphology and fiber content

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International Soil and Water Conservation Research 2022年第4期10卷 677-686页

作者： Yun Chen Han Tang Binghui He Zhehao Yan Xiaohong Liu Jiaojiao Qiang College of Resources and Environment/Chongqing Key Laboratory of Karst Environment Southwest UniversityChina

Root Tensile strength is commonly affected by root morphology and fiber content,which combinedly affect the effectiveness of terrace hedgerow on controlling soil erosion in sloping farmland.However,the relationships between these root characteristics are still elusive.This study aimed to compare the root Tensile strength,root morphologies,and root fiber contents,and quantify their differences among different plant species.Complete root systems of three terrace hedgerow plant species,i.e.,O.bodinieri,V.villosa,and D.lablab L.were sampled for detecting root morphologies and fiber contents at different slope positions on a representative hillslope in karst trough valley.Single root specimens were collected to measure root tensile properties for these three plant species.Results showed that most root morphological parameters were the highest in O.bodinieri,followed by D.lablab L.Three plant species presented the same dominant diameter class asTensile strength and Young's modulus were found in D.lablab L.,while the best ultimate tensile force and ultimate elongation were displayed in O.bodinieri.Root diameter showed negative power relationships with Tensile strength and Young's modulus,a positive power relationship with ultimate tensile force,and a positive linear relationship with ultimate elongation.Our results will deepen the understanding of the terrace hedgerow functions for controlling soil erosion worldwide.

关键词： Soil bioengineering Soil erosion Tensile strength Root diameter Fiber content

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Effect of internal defects on Tensile strength in SLM additively-manufactured aluminum alloys by simulation

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Chinese Journal of Aeronautics 2023年第10期36卷 485-497页

作者： Xin SONG Bowen FU Xin CHEN Jiazhen ZHANG Tong LIU Chunpeng YANG Yifan YE School of Mechanical Power Engineering Harbin University of Science and TechnologyHarbin 150080China COMAC Beijing Aircraft Technology Research Institute Beijing 102211China

This research investigates the effect of internal defects on the Tensile strength of Selective Laser Melting(SLM)additively-manufactured aluminum alloy(AlSi10Mg)test parts used for civil aircraft light weight design.A Finite Element Analysis(FEA)model containing internal defects was established by combining test data and the stress concentration factor comparison method.The effect of variation in the number,location and shape of defects on the finite element results was analyzed.Its results show that it is reasonable to use spherical defect modeling.The finite element modeling and analysis methods are also applied to the study of the effect of internal defects on Tensile strength in additive manufacturing of other metallic materials.According to the FEA results of single defects at different scales,the formula for calculating the weakening degree of Tensile strength applicable to the defective area of less than 15%was established.The result of the procedure is reliable and conservative.This research results can guide the selection of process parameters for the additive manufacturing of aluminum alloys.Further,the research results can promote the application of metal additive manufacturing in designing light-weight civil aircraft structures.

关键词： Additive manufacturing Internal defects Tensile strength Elasticity FEA Simulation experiments

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Tensile strength of sea ice using splitting tests based on the digital image correlation method

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Advances in Polar Science 2021年第4期32卷 374-381页

作者： CHEN Xiaodong HE Shuaikang HE Wenquan WANG Zhaoyu JI Shunying State Key Laboratory of Structure Analysis of Industrial Equipment Dalian University of TechnologyDalian 116023China DUT-BSU Joint Institute Dalian University of TechnologyDalian 116023China Marine Environmental Forecasting Station of Yingkou Yingkou 115007China Marine Monitoring and Early Warning Center of Liaoning Shenyang 110001China

The splitting test is a competitive alternative method to study the Tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation during the tests.In this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation method.The salinity,density,and temperature were measured to determine the total porosity.With the advantage of the digital image correlation method,the full-field deformation of the ice samples could be determined.In the loading direction,the samples mainly deformed at the ice-platen contact area.In the direction vertical to the loading,deformation appears along the central line where the splitting crack occurs.Based on the distribution of the sample deformation,a modified solution was derived to calculate the Tensile strength with the maximum load.Based on the modified solution,the Tensile strength was further calculated together with the splitting test results.The results show that the Tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests.

关键词： Tensile strength splitting test digital image correlation method ice mechanics sea ice

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