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Short beam shear properties and failure modes of the wood-based X-type lattice sandwich structure 被引量:1
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作者 Tengteng Zheng Liuxiao Zou Yingcheng Hu 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第2期877-887,共11页
A wood-based X-type lattice sandwich structure was manufactured by insertion-glue method.The birch was used as core,and Oriented Strand Board was used as panel of the sandwich structure.The short beam shear properties... A wood-based X-type lattice sandwich structure was manufactured by insertion-glue method.The birch was used as core,and Oriented Strand Board was used as panel of the sandwich structure.The short beam shear properties and the failure modes of the wood-based X-type lattice sandwich structure with different core direction(vertical and parallel),unit specification(120 mm×60 mm and 60 mm×60 mm),core size(50 mm and 60 mm),and drilling depth(9 mm and 12 mm)were investigated by a short beam shear test and the establishment of a theoretical model to study the equivalent shear modulus and deflection response of the X-type lattice sandwich structure.Results from the short beam shear test and the theoretical model showed that the failure modes of the wood-based X-type lattice sandwich structure were mainly the wrinkling and crushing of the panels under three-point bending load.The experimental values of deflection response of various type specimens were higher than the theoretical values of them.For the core direction of parallel,the smaller the unit specification is,the shorter the core size is,and the deeper the drilling depth is,the greater the short beam shear properties of the wood-based X-type lattice sandwich structure is. 展开更多
关键词 X-type Lattice sandwich structure Failure modes Short beam shear properties Theoretical model
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Evaluation of the Out-of-Plane Shear Properties of Cross-Laminated Timber
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作者 Yin Yang Xiaoyan Cao +2 位作者 Zhiqiang Wang Zhijun Liang Jianhui Zhou 《Journal of Renewable Materials》 SCIE 2019年第10期957-965,共9页
The out-of-plane shear properties of cross-laminated timber(CLT)substantially influence the overall mechanical properties of CLT.Various testing methods and theories related to these properties have recently been deve... The out-of-plane shear properties of cross-laminated timber(CLT)substantially influence the overall mechanical properties of CLT.Various testing methods and theories related to these properties have recently been developed.The effects of the number of layers(three and five layers)and testing method(short-span three-and four-point bending tests)on the out-of-plane shear properties of CLT were evaluated.The out-of-plane shear strength values were calculated based on different theories for comparison.The failure mode in the short-span four-point bending(FPB)method was mainly the rolling shear(RS)failure in the cross layers,indicating that the FPB method was appropriate to evaluate the RS strength of CLT.The out-of-plane shear capacity obtained using the three-point bending(TPB)method was higher than that tested by the FPB method.The testing methods significantly influenced the out-of-plane shear capacity of the three-layer specimens but not that of the five-layer specimens.With an increase in the number of layers,the out-of-plane shear strength of the specimens decreased by 24%.A linear correlation was found among the shear strength values obtained from different theories. 展开更多
关键词 Cross-laminated timber out-of-plane shear properties testing methods failure modes
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Experimental study on shear properties and resistivity change of soil-rock mixture
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作者 LIU Gang WANG Kui XIA Zhengting 《Journal of Mountain Science》 SCIE 2024年第11期3930-3944,共15页
The deterioration of shear resistance in rock and soil masses has resulted in numerous severe natural disasters,highlighting the significance of long-term monitoring for disaster prevention and mitigation.This study e... The deterioration of shear resistance in rock and soil masses has resulted in numerous severe natural disasters,highlighting the significance of long-term monitoring for disaster prevention and mitigation.This study explores the use of a non-destructive method to quickly and accurately evaluate the shear properties of soil-rock mixture.The shear stress,shear strain,and resistivity of the soil-rock mixture were tested simultaneously using a combination of direct shear and resistivity tests.The test results show that the resistivity of the soil-rock mixture gradually decreases with increasing shear strain.The resistivity of all specimens ranged approximately from 60 to 130Ω.m throughout the shear process.At the end of the shear test,the vertical failure resistivity showed an irregular“W”shape with increasing rock content.It exhibited a significant negative linear functional relationship with the shear strength.With reference to the determination of cohesion and internal friction angle on the shear strength envelope,the horizontal angle of the vertical failure resistivity-normal stress curve is defined as the resistivity angle,and the intercept of the curve is the resistivity at the initial moment of shear.It has been observed that the resistivity angle is negatively and linearly correlated with the internal friction angle.At the same time,there is a linear growth relationship between resistivity at the initial moment of shear and cohesion.It has been demonstrated that an increase in rock content contributes to a general escalation in both the average structure factor and average shape factor.Meanwhile,a decrease in the anisotropy coefficient has also been noted.These alterations are indicative of the extent of microstructural transformations occurring during the deformation process of the soil-rock mixture.The research results verify the feasibility of real-time deformation monitoring and characterization of shear strength parameters using resistivity. 展开更多
关键词 Soil-rock mixture shear properties Resistivity change Structural characteristic parameters Deformation monitoring
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Analytical Solution for Predicting In-plane Elastic Shear Properties of 2D Orthogonal PWF Composites 被引量:2
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作者 CHENG Xu XIONG Junjiang BAI Jiangbo 《Chinese Journal of Aeronautics》 SCIE EI CSCD 2012年第4期575-583,共9页
This paper proposes a new analytical solution to predict the shear modulus of a two-dimensional(2D) plain weave fabric(PWF) composite accounting for the interaction of orthogonal interlacing strands with coupled s... This paper proposes a new analytical solution to predict the shear modulus of a two-dimensional(2D) plain weave fabric(PWF) composite accounting for the interaction of orthogonal interlacing strands with coupled shear deformation modes including not only relative bending but also torsion,etc.The two orthogonal yarns in a micromechanical unit cell are idealized as curved beams with a path depicted by using sinusoidal shape functions.The internal forces and macroscopic deformations carried by the yarn families,together with macroscopic shear modulus of PWFs are derived by means of a strain energy approach founded on micromechanics.Three sets of experimental data pertinent to three kinds of 2D orthogonal PWF composites have been implemented to validate the new model.The calculations from the new model are also compared with those by using two models in the earlier literature.It is shown that the experimental results correlate well with predictions from the new model. 展开更多
关键词 textile composites mechanical properties shear modulus properties plain weave fabric
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Experimental and numerical investigation on the dynamic shear failure mechanism of sandstone using short beam compression specimen
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作者 Zelin Yan Feng Dai Yi Liu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2023年第8期1911-1923,共13页
In this study,a novel testing method is proposed to characterize the dynamic shear property and failure mechanism of rocks by introducing the short beam compression(SBC)specimen into the split Hopkinson pressure bar(S... In this study,a novel testing method is proposed to characterize the dynamic shear property and failure mechanism of rocks by introducing the short beam compression(SBC)specimen into the split Hopkinson pressure bar(SHPB)system.Firstly,the stress distribution of SBC specimen is comprehensively analyzed by finite element method(FEM),and the results show that the optimal notch separation ratio of SBC specimen is C/H?0.2 to achieve successful dynamic simple-shear tests.Then,dynamic shear tests are conducted on sandstone using the SBC-SHPB method.Via careful pulse shaping technique,the dynamic force balance is guaranteed for SBC specimens,and the testing results show that the dynamic shear strength of sandstone is significantly rate-dependent.Combining the results of dynamic compression and tension tests,the failure envelopes of sandstone under different loading rates are obtained in the principle stress plane.It is found that the failure envelope of sandstone constantly expands outwards with increasing loading rate.Moreover,the energy partition of SBC specimen is quantified by virtue of high-speed digital image correlation(DIC)technique.The results show that the kinetic energy portion is non-negligible,and the shear fracture energy increases with increasing loading rate.In addition,the microscopic shear cracking mechanism of SBC specimen is analyzed by the thin section observation:the intra-granular(TG)fracture of minerals dominates the dynamic shear failure of sandstone,and the portion of TG fracture increases with increasing loading rate.This study provides a convenient and reliable method to investigate the dynamic shear property and failure mechanism of rocks. 展开更多
关键词 Dynamic shear property Short beam compression(SBC) Dynamic fracture energy Micro-cracking mechanism
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Research and Analysis of Shear Performance of Inclined Blade Shears Based on ANSYS
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作者 Meili YU Guangchen XU 《Mechanical Engineering Science》 2023年第1期7-11,I0003,I0004,共7页
Nowadays,enterprise customers have higher and higher requirements for steel plate quality,and the performance research of shearing machine has been widely paid attention to.In this paper,the finite element analysis so... Nowadays,enterprise customers have higher and higher requirements for steel plate quality,and the performance research of shearing machine has been widely paid attention to.In this paper,the finite element analysis software ANSYS is used to analyze and verify the key parts of the downcut inclined blade shears.Through continuous analysis and improvement of the model,the weak points areoptimized to improve the shear performance andproduction efficiency of the shears. 展开更多
关键词 ANSYS shear quality shear property
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Shear creep characteristics and constitutive model of limestone 被引量:9
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作者 Yu Mei Mao Xianbiao Hu Xinyu 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第3期423-428,共6页
The characters of limestone in weak interlayer of a high rocky slope in Xuzhou, China, are studied by shear static test and shear creep test. The results show that limestone specimens have attenuation creep properties... The characters of limestone in weak interlayer of a high rocky slope in Xuzhou, China, are studied by shear static test and shear creep test. The results show that limestone specimens have attenuation creep properties and constant rate creep properties, almost have no accelerated creep properties. The exponential type empirical formula is selected to fit creep grading curves by polynomial regression analysis method, and the square sums of the fitting results residual are in the order of 10^(-7). Then grade creep curves at every shear loads are set up. Combining creep rate-time curve, the creep properties of limestone are analyzed. As the physical meaning of component model is clearer, the Poytin–Thomson model is set up. Through the least square method, the optimal parameters of Poytin–Thomson model are obtained,and the sums of squared residuals belong to 10^(-3)order of magnitude, which can meet the accuracy requirements of engineering calculation. So the Poytin–Thomson model can reflect the shear creep characteristics of limestone very well. 展开更多
关键词 Limestone shear creep property Empirical formula Poytin–Thomson model
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Prediction of the Shearing Property of Worsted Fabrics Using BP Neural Network
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作者 徐广标 张向华 王府梅 《Journal of Donghua University(English Edition)》 EI CAS 2006年第6期47-49,共3页
In this paper, three layers of BP neural network were used to model the shearing properties of worsted fabrics. We train the neural network models with 27 kinds of fabrics, and then use 6 kinds of fabrics to validate ... In this paper, three layers of BP neural network were used to model the shearing properties of worsted fabrics. We train the neural network models with 27 kinds of fabrics, and then use 6 kinds of fabrics to validate the accuracy of the model. The result shows that the predicted accuracy of the models is about 85%. 展开更多
关键词 worsted fabric shearing properties neural network models predictive accuracy.
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Draping Behavior of Carbon Non-Crimp Fabrics and Its Effects on Mechanical Performance of the Hemispherical Composites 被引量:1
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作者 李龙 肇研 +3 位作者 LIU Gang ZHAO Xiaoran SONG Jiupeng GONG Ming 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第3期720-728,共9页
In order to investigate the draping behavior of non-crimp fabrics(NCFs), two types of carbon NCFs with tricot-chain stitches or chain stitches were formed on a hemispherical mould via a stretch forming process. The ... In order to investigate the draping behavior of non-crimp fabrics(NCFs), two types of carbon NCFs with tricot-chain stitches or chain stitches were formed on a hemispherical mould via a stretch forming process. The shear angle and forming defects of the fabrics were measured on the hemisphere, under different blank holder forces(BHFs). The results showed that increasing BHF could enhance the shear angle slightly, reduce the asymmetry for the deformation of the fabrics, and change the main type of the process-induced defects. Besides, compression tests were performed on the corresponding composite components. By analyzing the change of fiber volume fraction and structural parameters of the textile reinforcements, the effects of draping behavior of NCFs on the mechanical performance of the composites were studied. The results reveal that draping process has distinguishable impacts on the mechanical properties of the final components, which is closely related to the stitching pattern of the NCFs. 展开更多
关键词 non-crimp fabric hemispherical forming shear deformation mechanical properties liquid composite molding
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Fractography and morphology of shear bands of a Zr-based bulk metallic glass
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作者 Jun Tan Jun-yan Gao +5 位作者 Xue-mei Qin Zheng-rong Fu Dong Li Min Li Xiu-chang Wang Gang Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第4期385-389,共5页
Bulk metallic glasses(BMGs)have attracted considerable attention in the last few decades particularly triggered by their potential applications as novel structural and/or functional materials,owing to their superior... Bulk metallic glasses(BMGs)have attracted considerable attention in the last few decades particularly triggered by their potential applications as novel structural and/or functional materials,owing to their superior strength,large elastic strain limit and relatively low Young′s modulus etc.compared to their crystalline counterparts.Here,a 3Dreconstruction application to the fractography and the morphology of shear bands was reported for a ductile Zr_(56)Co_(28)Al_(16)(at.%)BMG through a Phenom series desktop scanning electron microscope.The results of the 3Dreconstruction and the following contour analysis indicate a typical shear fracture mode for the investigated alloy.It is inferred that the fractography and the morphology of shear bands might be dependent on their composition,structure states,and loading conditions for BMGs. 展开更多
关键词 Amorphous alloy Fractography Mechanical property shear band
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Biochar-Induced Changes in Soil Resilience:Effects of Soil Texture and Biochar Dosage 被引量:7
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作者 Ayodele Ebenezer AJAYI Rainer HORN 《Pedosphere》 SCIE CAS CSCD 2017年第2期236-247,共12页
Biochars are, amongst other available amendment materials, considered as an attractive tool in agriculture for carbon sequestration and improvement of soil functions. The latter is widely discussed as a consequence of... Biochars are, amongst other available amendment materials, considered as an attractive tool in agriculture for carbon sequestration and improvement of soil functions. The latter is widely discussed as a consequence of improved physical quality of the amended soil.However, the mechanisms for this improvement are still poorly understood. This study investigated the effect of woodchip biochar amendment on micro-structural development, micro-and macro-structural stability, and resilience of two differently textured soils,fine sand(FS) and sandy loam(SL). Test substrates were prepared by adding 50 or 100 g kg^(-1) biochar to FS or SL. Total porosity and plant available water were significantly increased in both soils. Moreover, compressive strength of the aggregates was significantly decreased when biochar amount was doubled. Mechanical resilience of the aggregates at both micro-and macro-scale was improved in the biochar-amended soils, impacting the cohesion and compressive behavior. A combination of these effects will result in an improved pore structure and aeration. Consequently, the physicochemical environment for plants and microbes is improved. Furthermore, the improved stability properties will result in better capacity of the biochar-amended soil to recover from the myriad of mechanical stresses imposed under arable systems, including vehicle traffic, to the weight of overburden soil. However, it was noted that doubling the amendment rate did not in any case offer any remarkable additional improvement in these properties, suggesting a further need to investigate the optimal amendment rate. 展开更多
关键词 aggregate stability amendment material compressive strength RHEOMETRY shear properties total porosity
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Dynamic deformation behavior of a FeCrNi medium entropy alloy 被引量:3
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作者 Ao Fu Bin Liu +3 位作者 Zezhou Li Bingfeng Wang Yuankui Cao Yong Liu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第5期120-128,共9页
Deformation behavior of a FeCrNi medium entropy alloy(MEA)prepared by powder metallurgy(P/M)method was investigated over a wide range of strain rates.The FeCrNi MEA exhibits high strain-hardening ability,which can be ... Deformation behavior of a FeCrNi medium entropy alloy(MEA)prepared by powder metallurgy(P/M)method was investigated over a wide range of strain rates.The FeCrNi MEA exhibits high strain-hardening ability,which can be attributed to the multiple deformation mechanisms,including dislocation slip,deformation induced stacking fault and mechanical twinning.The shear localization behavior of the FeCrNi MEA was also analyzed by dynamically loading hat-shaped specimens,and the distinct adiabatic shear band cannot be observed until the shear strain reaches~14.5.The microstructures within and outside the shear band exhibit different characteristics:the grains near the shear band are severely elongated and significantly refined by dislocation slip and twinning;inside the shear band,the initial coarse grains completely disappear,and transform into recrystallized ultrafine equiaxed grains by the classical rotational dynamic recrystallization mechanism.Moreover,microvoids preferentially nucleate in the central areas of the shear band where the temperature is very high and the shear stress is highly concentrated.These microvoids will coalesce into microcracks with the increase of strain,which eventually leads to the fracture of the shear band. 展开更多
关键词 Medium entropy alloys Mechanical response Dynamic shear properties Grain refinement Adiabatic shear band
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A comparison between powder flow property testers 被引量:2
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作者 Hamid Salehi Diego Barletta Massimo Poletto 《Particuology》 SCIE EI CAS CSCD 2017年第3期10-20,共11页
In this work, three different shear testers-the Jenike shear cell tester, the Schulze ring shear tester, and the Brookfield powder flow tester-were compared in terms of the raw shear stress time series, yield loci poi... In this work, three different shear testers-the Jenike shear cell tester, the Schulze ring shear tester, and the Brookfield powder flow tester-were compared in terms of the raw shear stress time series, yield loci points, angle of internal friction, cohesion, and unconfined yield strength. The three different powders of dolomitic lime, calcium lactate, and calcium carbonate were used for these comparisons. These three powders were characterized into different flowability classes using the ]enike classification, wherein dolomitic lime falls into the cohesive range, calcium lactate falls into the free-flowing range, and calcium carbonate falls into the very cohesive range. Results showed that the best agreement between the testers was found with moderately cohesive powders such as dolomitic lime. Furthermore, the free-flowing material tends to produce more consistent data between the three testers in terms of shear stresses and yield loci. It should be noted that the pre-shear data of free-flowing powder obtained by the Jenike shear cell must be appropriately interpreted. The largest differences between the testers are found with calcium carbonate, which is a highly compressible powder. The ways in which a high powder compressibility can differently affect the results obtained with the different testers were discussed. 展开更多
关键词 Powder flow property shear tester Flowability Jenike tester Schulze tester Brookfield powder flow tester
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