检索结果-南通市图书馆

shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2022年第1期29卷 259-269页

作者： Mehrdad KHOLGHIFARD Babak AMINI BEHBAHANI Department of Civil Engineering Yasooj BranchIslamic Azad UniversityYasooj ***Iran

The main objective of this study is to investigate the effects of the nanoclay mixed with recycled polyester fiber on the mechanical behavior of soil as a new stabilizer *** meet this objective,a series of drained direct shear and compaction tests were performed on unreinforced and reinforced soil specimens with three different combinations of the fiber-soil ratios ranging between 0.1%and 0.5%,as well as three different combinations of nanoclay soil ratios ranging between 0.5%and 1.5%of the soil dry *** indicated that composition of the nanoclay recycled polyester fiber with the soil improved the friction angle(Φ)by 41%and cohesion(c)by 174%.The soil particles stick together through viscose gel produced by *** addition,the rough and wavy surface of the fibers creates a bond and friction between the soil particles and prevents the movement of soil particles,and as a result,the soil strength is increased.

关键词： soil treatment nanoclay recycled polyester fiber shear strength clayey sand

Study on the shear strength of deep reconstituted soils

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2009年第3期19卷 405-408页

作者： ZHAO Xiao-dong ZHOU Guo-qing TIAN Qiu-hong State Key Laboratory for Geomechanics ＆ Deep Underground Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China School of Architecture ＆ Civil Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Based on analytical methods of strength studies for deep soils, direct shear tests were carried out to investigate the shear strength of deep reconstituted soils at different initial dry densities and amounts of *** results indicate that the shear strength of deep reconstituted soils for identical amounts of water below the plastic limit is enhanced with increasing dry density and but reduced sharply at the critical density, the point at which coarse particles break ***, the shear strength for identical dry density decreases with additional amounts of water and the rate of degradation is the greatest at the critical *** is because the friction resistance between coarse particles reduces with increasing amounts of water higher than the plastic *** order to obtain reliable strength of deep reconstituted soils, suitable dry densities and amounts of water are necessary.

关键词： deep reconstituted soils shear strength dry density water content critical density

Effects of Al2O3-Particulate-Contained Composite Filler Materials on the shear strength of Alumina Joints

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2002年第4期18卷 289-290页

作者： JianguooYANG HongyuanFANG 等 NationlKeyLaboratoryofAdvancedWeldingProductionTechnology HarbinInstituteofTechnologyHarbin150001China NationlKeyLaboratoryofAdvancedWeldingProductionTechnology HarbinInstituteofTechnologyHarbin1500

Al2O3l2O3 joints were brazed with a new kind of filler materials, which were formed by adding AI203 particulates into Ag-Cu-Ti active filler metal. The results showed that the material parameters (the Ti content, Al2O3 particulate volume fraction) of the composite filler materials affected the shear strength of brazed joints. When the Ti content was 2 wt pct in the filler metal, the shear strength of brazing joints decreased with the increasing the volume ratio of Al2O3 particulate. When the Ti content was 3 wt pct in the filler metal, the shear strength of joints increased from 93.75 MPa(AI203p 0 vol. pct) to 135.32 MPa(AI203p 15 vol. pct).

关键词： Composite filler material shear strength Braze Ceramic

Interlayer shear strength of single crystalline graphite

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第4期28卷 978-982页

作者： Ze Liu Shou-Mo Zhang Jia-Rui Yang Jefferson Zhe Liu Yan-Lian Yang Quan-Shui Zheng Department of Engineering Mechanics and Center for Nano and Micro Mechanics Tsinghua University100084 BeijingChina Department of Mechanical and Aerospace Engineering Monash UniversityClayton3800 VICAustralia National Center for Nanoscience and Technology Beijing 100190China

Reported values （0.2 MPa-7.0 GPa） of the interlayer shear strength （ISS） of graphite are very dispersed. The main challenge to obtain a reliable value of the ISS using conventional measuring methods was the unavailability of sufficiently large single crystalline graphite. Here we present a novel experimental method to measure the ISS, and obtain the value as -0.14 GPa. Our result can serve as an important basis for understanding mechanical behavior of graphite or graphene-based materials.

关键词： shear strength Single crystalline graphite

Influence of Soaking Effects to the shear strength of the Colluviums on Mt. Da-Lum

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2007年第4期12卷 577-582页

作者： CHEN Shiou CHEN Poshuo HUANG Hanchen College of Arts and Design Huafan University Taipei 223Taiwan China College of Engineering Tankang University Taipei 251Taiwan China

Landslide of colluviums often occurs during or after heavy rainfall because the huge quantity of precipitation induces the upsurge of groundwater table as well as the reduction of effective stress of soil stratum and the factor of safety from slope stability analysis. Moreover, the longer duration of heavy rainfall maintain the higher groundwater table, the shear strength parameters may be decline due to the soil being soaked for longer period of time. The campus of Huafan University is mostly covered by colluviums that located on Mt. Da-Lum, Shih-Tin Hsiang, Taipei County, Taiwan, China. Slope stability is one of the major concerned issues, for this reason, a slope monitoring test site has been established around the campus. According to the data collected, the magnitude of slope movement influenced by rainfall can be observed. In this study, the colluviums samples are collected from the campus of Huafan University and direct shear tests are performed to obtain the shear strength parameters of the remolded soil samples that soaked in the water for various periods of time, i.e. 0, 1, 2, 3, 5 and 7 days respectively. From these tests, the change of the shear strength and slope stability of colluviums with respect to the soaking time of soil has been further understood.

关键词： landslide soaking effects shear strength colluviums

Microstructure and shear strength ofγ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2143-2155页

作者： Li LI Wei ZHAO Zhi-xue FENG Jia SUN Xiao-qiang LI School of Materials Science and Engineering East China Jiaotong UniversityNanchang 330013China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Bogie Design Department CRRC Nanjing Puzhen Co.Ltd.Nanjing 210031China

The influence of brazing temperature and brazing time on the microstructure and shear strength ofγ-TiAl/GH536 joints brazed with Ti-Zr-Cu-Ni-Fe-Co-Mo filler was investigated using SEM,EDS,XRD and universal testing *** show that all the brazed joints mainly consist of four reaction layers regardless of the brazing temperature and brazing *** thickness of the brazed seam and the average shear strength of the joint increase firstly and then decrease with brazing temperature in the range of 1090-1170℃and brazing time varying from 0 to 20 *** maximum shear strength of 262 MPa is obtained at 1150℃for 10 *** brittle Al3NiTi2 and TiNi3 intermetallics are the main controlling factors for the crack generation and deterioration of joint *** fracture surface is characterized as typical cleavage fracture and it mainly consists of massive brittle Al3NiTi2 intermetallics.

关键词： γ-TiAl alloy Ni-based superalloy vacuum brazing amorphous filler microstructure shear strength

shear strength of an unsaturated weakly expansive soil

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2010年第2期2卷 155-161页

作者： Weimin Ye Yawei Zhang Bao Chen Xiuhan Zhou Qiang Xie Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China United Research Center for Urban Environment and Sustainable Development of Ministry of Education Shanghai200092China Wuhan-Shiyan Expressway Management Bureau in Hubei Province Wuhan430000China

To study the weakly expansive clay obtained from a slope along Wuhan—Shiyan expressway in Hubei Province,soil-water property tests and some unsaturated triaxial tests with suction control were conducted,and the soil-water retention curve（SWRC） and unsaturated shear strength of this soil were *** show that the air-entry suction and the residual degree of saturation of the tested soil are 106 kPa and 8%,*** boundary effect zone and the transition zone can be identified on the desorption curve,but the residual zone is not so *** unsaturated shear strength increases as suction increases within the range of controlled suction in the test,and friction angle,b,in the triaxial shear test is 17.6°.Based on the results,constitutive models for predicting the unsaturated shear strength using the SWRC were evaluated,and comparisons between prediction and measurement were *** is concluded that for engineering purpose,the constitutive model should be carefully selected based on soil properties when predicting the unsaturated shear strength using the SWRC.

关键词： unsaturated soil soil-water retention curve(SWRC) weakly expansive soil suction shear strength

Effect of Mo and ZrO_(2)nanoparticles addition on interfacial properties and shear strength of Sn58Bi/Cu solder joint

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2619-2628页

作者： Amares SINGH Hui Leng CHOO Wei Hong TAN Rajkumar DURAIRAJ School of Engineering Faculty of Innovation&TechnologyTaylor’s UniversitySubang Jaya47500SelangorMalaysia Faculty of Mechanical Engineering&Technology Universiti Malaysia Perlis(UniMAP)Pauh Putra Campus02600 ArauPerlisMalaysia Lee Kong Chian Faculty of Engineering and Science Universiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai Long43000 KajangSelangorMalaysia

The influence of Mo and ZrO_(2)nanoparticles addition on the interfacial properties and shear strength of Sn58Bi solder joint was *** interfacial microstructures of Sn58Bi/Cu,Sn58Bi+Mo/Cu and Sn58Bi+ZrO_(2)/Cu solder joints were analysed using a scanning electron microscope(SEM)coupled with energy dispersive X-ray(EDX)and the X-ray diffraction(XRD).Intermetallic compounds(IMCs)of MoSn_(2)are detected in the Sn58Bi+Mo/Cu solder joint,while SnZr,Zr_(5)Sn_(3),ZrCu and ZrSn_(2)are detected in Sn58Bi+ZrO_(2)/Cu solder *** layers for both composite solders comprise of Cu_(6)Sn_(5) and Cu_(3)*** SEM images of these layers were used to measure the IMC layer’s *** average IMC layer’s thickness is 1.4431μm for Sn58Bi+Mo/Cu and 0.9112μm for Sn58Bi+ZrO_(2)/Cu solder *** strength of the solder joints was investigated via the single shear lap test *** average maximum load and shear stress of the Sn58Bi+Mo/Cu and Sn58Bi+ZrO_(2)/Cu solder joints are increased by 33%and 69%,respectively,as compared to those of the Sn58Bi/Cu solder *** comparing both composite solder joints,the latter prevails better as adding smaller sized ZrO_(2)nanoparticles improves the interfacial properties granting a stronger solder joint.

关键词： lead-free solder interfacial microstructure IMC layer thickness shear strength dislocation density ZrO_(2)nanoparticles Mo nanoparticles

Microstructure and shear strength of reactive brazing joints of TiAl/Ni-based alloy

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2012年第2期22卷 324-329页

作者：李海新何鹏林铁松潘峰冯吉才黄玉东哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001 哈尔滨工业大学化工学院哈尔滨150001

Reactive brazing of TiAl-based intermetallics and Ni-based alloy with Ti foil as interlayer was investigated. The interfacial microstructure and shear strength of the joints were studied. According to the experimental observations, the molten interlayer reacts vigorously with base metals, forming several continuous reaction layers. The typical interfacial microstructure of the joint can be expressed as GH99/（Ni,Cr）ss（γ）/TiNi（β2）＋TiNi2Al（τ4）＋Ti2Ni（δ）/δ＋Ti3Al（α2）＋Al3NiTi2（τ3）/α2＋τ3/TiAl. The maximum shear strength is 258 MPa for the specimen brazed at 1000°C for 10 min. Higher brazing temperature or longer brazing time causes coarsening of the phases in the brazing seam and formation of brittle intermetallic layer, which greatly depresses the shear strength of the joints.

关键词： TiA1 Ni-based alloy reactive brazing interfacial microstructure shear strength