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dynamic mechanical properties and Energy Dissipation Characteristics of Frozen Soil Under Passive Confined Pressure

Acta Mechanica Solida Sinica 2021年第2期34卷 184-203页

作者： Jinxuan Jia Huaiping Tang Huijian Chen Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Impact compression tests on frozen soil samples with different freezing temperatures and subjected to passive confined pressure were performed using a split Hopkinson pressure bar at different loading strain *** three-dimensional stress-strain curves of the frozen soil samples under the corresponding conditions were *** experimental results showed that,when the frozen soil was loaded to its elastic limit,shear failure occurred,the bearing capacity of pore ice was lost,and the thawed soil functioned as the main stress-bearing ***,the capacity of frozen soil to withstand hydrostatic pressure continued to *** dynamic mechanical properties of the frozen soil under passive confined pressure were observed to be strongly related to the loading strain rate and freezing *** the loading strain rate increased,the secant modulus,elastic modulus,and strength(including the shear strength)of the frozen soil increased,whereas its Poisson^ratio and coefficient of lateral pressure *** the freezing temperature decreased,the secant modulus,elastic modulus,and shear strength of the frozen soil increased;however,its Poisson5s ratio and coefficient of lateral pressure *** the frozen soil was subjected to impact loading under passive confined pressure,energy dissipation occurred due to plastic deformation,mesoscopic damage evolution,and ice-water phase *** shear failure occurred,the absorption energy per unit volume of frozen soil increased as the freezing temperature decreased and the loading strain rate increased.

关键词： Frozen soil Split Hopkinson pressure bar Passive confined pressure dynamic mechanical properties Energy dissipation

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dynamic mechanical properties and constitutive equations of 2519A aluminum alloy

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2179-2186页

作者：刘文辉何圳涛陈宇强唐思文湖南科技大学机电工程学院湘潭411201

To analyze the effects of strain rate and temperature on the flow stress of 2519A aluminum alloy, the dynamic mechanical properties of 2519A aluminum alloy were measured by dynamic impact tests and quasi-static tensile tests. The effects of strain rate and temperature on the microstructure evolution were investigated by optical microscopy （OM） and transmission electron microscopy （TEM）. The experimental results indicate that 2519A aluminum alloy exhibits strain-rate dependence and temperature susceptibility under dynamic impact. The constitutive constants for Johnson--Cook material model were determined by the quasi-static tests and Hopkinson bar experiments using the methods of variable separation and nonlinear fitting. The constitutive equation seems to be consistent with the experimental results, which provides reference for mechanical characteristics and numerical simulation of ballistic performance.

关键词： 2519A aluminum alloy dynamic mechanical properties Johnson-Cook model microstructure

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dynamic mechanical properties and instability behavior of layered backfill under intermediate strain rates

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Transactions of Nonferrous Metals Society of China 2017年第7期27卷 1608-1617页

作者： Yun-hai ZHANG Xin-min WANG Chong WEI Qin-li ZHANG School of Resources and Safety Engineering Central South University Changsha 410083 China

To obtain dynamic mechanical properties and failure rule of layered backfill under strain rates from10to80s-1,impactloading test on layered backfill specimens(LBS)was conducted by using split Hopkinson pressure bar *** results indicatethat positive correlation can be found between dynamic compressive strength and strain rate,as well as between strength increasefactor and strain *** compressive strength of LBS gets higher as the arithmetic average cement-sand ratio *** with static compressive strength,dynamic compressive strength of LBS is enhanced by11%to163%.In addition,theenergy dissipating rate of LBS lies between that of corresponding single specimens,and it decreases as the average cement *** of LBS shows obvious discontinuity,deformation degree of lower strength part of LBS is generally higherthan that of higher strength part.A revised brittle fracture criterion based on the Stenerding-Lehnigk criterion is applied to analyzingthe fracture status of LBS,and the average relevant errors of the3groups between the test results and calculation results are4.80%,3.89%and4.66%,respectively.

关键词： layered backfill specimen (LBS) split Hopkinson pressure bar (SHPB) dynamic mechanical properties damage characteristic failure criterion

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Experimental Study on the dynamic mechanical properties of Reinforced Concrete under Shock Loading

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Acta Mechanica Solida Sinica 2016年第1期29卷 22-30页

作者： Haifeng Liu Jie Fu Jianguo Ning Department of Civil and Hydraulic Engineering Ningxia University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

A simple experimental method was introduced to study the mechanical properties of reinforced concrete under shock loading. The one-stage light gas gun was used to test the me- chanical properties of reinforced concrete with different reinforcement ratios under various impact velocities. Three Mn-Cu piezoresistive pressure gauges embedded in the target were used to record the voltage-time signals, from which the stress-strain curves of reinforced concrete were obtained using Lagrangian analysis. Experimental results indicated that the load-bearing capacities of re- inforced concrete increased greatly with the impact velocity and the reinforcement ratio. The peak stress of the shock wave decreased exponentially with the propagation distance.

关键词： reinforced concrete shock loading Lagrangian analysis dynamic mechanical properties

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Flexural and dynamic mechanical properties of Alkali-Treated Coir/Pineapple Leaf Fibres Reinforced Polylactic Acid Hybrid Biocomposites

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Journal of Bionic Engineering 2021年第6期18卷 1430-1438页

作者： Ramengmawii Siakeng Mohammad Jawaid Mohammad Asim Hassan Fouad Sameer Awad Naheed Saba Suchart Siengchin Department of mechanical and Process Engineering The Sirindhorn International Thai-GermanGraduate School of Engineering(TGGS)King Mongkut’s University of Technology North BangkokBangkok10800Thailand Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 UPMSerdangSelangorMalaysia Applied Medical Science Department Community CollegeKing Saud UniversityP.O.Box 10219Riyadh11433Saudi Arabia Chemistry School of Science and TechnologyUniversity of New EnglandArmidaleNSW2351Australia

Polylactic acid(PLA)possesses good mechanical and biodegradability properties which make it a suitable material for polymer composites whereas brittleness and high costs limit its utilization in various *** reinforcement of natural fibres with biopolymers has been formed to be an efficient technique to develop composites having the ability to be fully *** study concerns with the incorporation of various percentages of untreated and alkali-treated Coir Fibres(CF)and pineapple leaf fibres(PALF)in PLA biocomposites and characterizations of flexural,morphological and dynamic mechanical *** properties showed that the treated C1P1 hybrid composites(C1P1A)displayed highest flexural strength(35.81 MPa)and modulus(5.28 GPa)among all hybrid *** Electron Microscopy(SEM)revealed a behaviour of fibre-matrix adhesion in untreated treated *** observation revealed good dispersion of the fillers in *** mechanical analysis revealed that C1P1A showed highest glass transition temperature(Tg)and storage modulus(E')while untreated C3P7 displayed the least Tg and E'.Overall findings showed that alkali-treated hybrid biocomposites(CF/PALF/PLA)especially C1P1A have improved flexural properties,dynamic and morphological properties over untreated *** of these findings will provide attracting consideration of these hybrid biocomposites for various lightweight uses in a broad selection of industrial applications such as biomedical sectors,automobile,construction,electronics equipment,and hardware tools.

关键词： Coir fibres Pineapple leaf fibres Biocomposites Polylactic acid mechanical properties dynamic mechanical properties

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Investigation of three different cooling treatments on dynamic mechanical properties and fragmentation characteristics of granite subjected to thermal cycling

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Underground Space 2022年第5期7卷 847-861页

作者： Lifeng Fan Han Li Yan Xi Beijing University of Technology Beijing 100124China

Underground thermal engineering such as geothermal exploitation usually involves the response of impact loads due to the drilling operation and blasting *** study investigated the dynamic mechanical properties and fragmentation characteristics of granite subjected to thermal cycling under natural cooling,water cooling,and liquid nitrogen ***,split Hopkinson pressure bar tests were performed on granite under three different cooling methods to study the dynamic mechanical parameters with thermal ***,the damage factors were calculated to evaluate the damage on granite and the relationship between damage and ***,the granite fragments after impact were sieved,and the fractal dimension and average fragment size were introduced to analyze the fragmentation *** results demonstrate that the degradation of dynamic mechanical properties mainly occurs in the first four thermal cycles;with the increase of damage factor,the stress decreases linearly under the three cooling methods,and the damage caused by liquid nitrogen cooling to granite is the most significant,followed by water *** of granite change from axial splitting failure to a more complex composite failure *** addition,with the decrease of the average fragment size,the fractal dimension of the granite gradually increases,resulting in the higher fragmentation degree and the better uniformity of fragmentation.

关键词： Split Hopkinson pressure bar dynamic mechanical properties Fragmentation characteristics Cooling treatment

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dynamic mechanical properties of Wood Powder /Polypropylene Composites

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Chinese Forestry Science and Technology 2003年第1期2卷 56-59页

作者： Yasunori HATANO Forestry and Forest Products Research Institute Tsukuba Tsukuba Ibaraki Japan

The dynamic mechanical properties of wood powder/polypropylene composites with different wood content treated and untreated with the compatibilizer have been studied. It has been found that addition of wood powders and the compatibilizer can both improve the viscoelasticity of composites. Glass transition temperature (Tg) of appropriate wood powder-filled composites decreased. The value for the storage modulus (G') increased gradually with increasing wood powder content. The addition of the compatibiliz...

关键词： dynamic mechanical properties wood powder/polypropylene composites compatibilizer

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dynamic mechanical properties of Functional Additives and Mica Filled EVA Nanocomposites

Dynamic Mechanical Properties of Functional Additives and Mi...

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2007年全国高分子学术论文报告会

作者：华诚张诚沈伟马淳安浙江工业大学绿色化学合成国家重点实验室培育基地浙江工业大学绿色化学合成国家重点实验室培育基地浙江工业大学绿色化学合成国家重点实验室培育基地浙江工业大学绿色化学合成国家重点实验室培育基地

＜正＞dynamic mechanical analysis（DMA）is carried out to explore temperature dependence of viscoelasticity for a series of Poly（ethylene-co-vinylacetate）（EVA）based hybrids,which include several functional additives KT-A（abbr.A）,KT-B（abbr.B）modified EVA and mica filled EVA/A/B *** output from DMA show that all the above additives have a significant effect on viscoelastic *** the addition of A,the position of the damping peak shifts to a higher region and the value of the loss tangent （Tan（?））increases *** laminal mica filled EVA/A/B nano-composites are also prepared by using melt intercalation *** results indicate that the dynamic mechanical properties of the mica filled EVA/A/B nanocomposites can be improved within a certain extent.

关键词： EVA Mica Melt Intercalation dynamic mechanical properties

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Effect of Gd content on microstructure and dynamic mechanical properties of solution-treated Mg−xGd−3Y−0.5Zr alloy

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2177-2189页

作者： Xue-zhao WANG You-qiang WANG Chen-bing NI Yu-xin FANG Xiao YU Ping ZHANG School of mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Key Lab of Industrial Fluid Energy Conservation and Pollution Control Ministry of EducationQingdao 266520China College of mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China

The effect of Gd content ranging from 6.5 wt.%to 8.5 wt.%on microstructure evolution and dynamic mechanical behavior of Mg−xGd−3Y−0.5Zr alloys was investigated by optical microscopy,X-ray diffraction,scanning electron microscopy and split Hopkinson pressure *** microstructure of as-cast Mg−xGd−3Y−0.5Zr alloys indicates that the addition of Gd can promote grain refinement in the *** to the rapid cooling rate during solidification,a large amount of non-equilibrium eutectic phase Mg_(24)(Gd,Y)_(5) appears at the grain boundary of as-cast Mg−xGd−3Y−0.5Zr *** solution treatment at 520℃ for 6 h,the Mg_(24)(Gd,Y)_(5) phase dissolves into the matrix,and the rare earth hydrides(REH)phase *** stress−strain curves validate that the solution-treated Mg−xGd−3Y−0.5Zr alloys with optimal Gd contents maintain excellent dynamic properties at different strain *** was concluded that the variation of Gd content and the agglomeration of residual REH particles and dynamically precipitated fine particles are key factors affecting dynamic mechanical properties of Mg−xGd−3Y−0.5Zr alloys.

关键词： Mg−xGd−3Y−0.5Zr alloy microstructure dynamic mechanical properties rare earth hydrides dynamic precipitated phase

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EFFECTS OF MOLECULE AGGREGATION STATE OF HINDERED PHENOL ON dynamic mechanical properties OF CHLORINATED POLYETHYLENE

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Chinese Journal of Polymer Science 2004年第1期22卷 7-16页

作者：吴驰飞 Institute of Material Science and Technology East China University of Science and Technology Shanghai 200237 China

Hindered phenol compound 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy]ethyl}- 2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) is a polymorphous material with different physical structures. The initial AO- 80 is highly crystalline, whereas AO-80 obtained by cooling from its molten state is an amorphous material. Annealing treatment below the melting point of AO-80 results in structural development. The mixture of chlorinated polyethylene (CPE) and vitrified AO-80 particles exhibits a dramatic change in the dynamic mechanical properties during heat treatment at 130'C. This change can be attributed to the decomposition of the vitrified AO-80 particles and the hybridization of two constituents. The vitrified AO-80 particles can crystallize again in a CPE matrix by annealing at 100'C, but this crystal is different from that of the initial AO-80 in its microstructure. In addition, the incorporation of CPE chains caused a dramatic increase in the modulus. As a result, the AO-80 crystal particles that contain some CPE chains act as multifunctional cross- links and the CPE/AO-80 hybrid was found to be a new type of elastomer.

关键词： Hindered phenol Polymorphous dynamic mechanical properties Chlorinated polyethylene

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