共搜索到15238条信息，每页显示10条信息，共1524页。用时：0小时0分0秒674毫秒
玻璃钢层合板的超低温双切口层间剪切强度研究 堀口胜三1,进藤裕英1,王瑞2 (1.日本东北大学 980-8579;2.天津纺织工学院 300160) 摘要:本文采用三维有限元法对双切口剪切试验测定玻璃钢层合板的超低温层间剪切强度进行了理论分析和研究,解析用的层合板有效弹性系数由组分材料的弹性系数和织物结构的代表体积单元求得.数值解析发现,当切口间隔与厚度之比较小时,双切口剪切试验片可产生较均匀的剪切应力分布.通过与二维有限元解析结果的对比分析,阐明了试验片三维形状对剪切应力分布的影响. 关键词:低温力学玻璃钢层合板层间剪切强度双切口剪切试验剪切应力分布有限元法; Cryomechanics glass cloth/epoxy laminates interlaminar shear strength double-notch shear tests shear stress......
the reliability of mechanical property, tensile test was done to measure the shear strength, and the shear strength dropped with increasing the content of FCC-TiB powders. It is about 12.26 MPa at the content... is the thickness; L is the length. 2.4 Shear strength testing The sample preparation and testing method for shear strength accorded to the Chinese standard GB7124-86. The structure of shearing sample is shown......
strength of 506 MPa were observed in 40 μm gap sample. Alloying elements formed γ′ precipitates and the solid-solution in the ISZ. Hardness and shear strength of bonds were reduced with increasing... and 40 thermal-shock cycles were applied to 80 μm gap samples, respectively. The shear strength of the bond was measured to be 268 MPa after the 40th thermal-shock cycle. The sample with gap size......
at temperature below 220 ℃. The microstructure, elemental distribution and shear strength of the interface were studied with Axiover 40 MAT optical microscope, Quanta200 scanning electron microscope, EDAX energy... strength depends on the structure of the diffusion layer. When the structure of the diffusion layer is dominated by solid solution, the interfacial shear strength will be enhanced by proper heat......
and composition of bonding zone become homogenous, and 2-3 μm-thick Cr, Fe elements diffuse band also forms in the tungsten matrix. The average shear strength of joints holding for 360 min reaches 213 MPa, and the fracture failure occurs mainly in the tungsten matrix. Key words: tungsten; stainless steel; transient liquid phase bonding; shear strength 基金项目:国家自然科学基金资助项目(51075205)；江苏省自然科学基金资助项目......
Influence of chemical action of water-soil on soil shear strength WANG Jun1, 2, CAO Ping1, ZHAO Yan-lin1, CHAI Hong-bao1 (1. School of Resources and Safety Engineering, Central South University..., samplings of soil, ground water and clays were obtained to observe and analyze the effect. The analysis on mechanics of water-soil interaction was carried out to find factors of shear strength, including......
......
is found instead of the bulky β-Sn arborescent crystal. The shear strength of the Sn-3Ag-0.5Cu-1%Fe/Cu is 46 MPa, which is 39% higher than that of the Sn-3Ag-0.5Cu/Cu. The microhardness of the matrix increases approximately 25% as a result of incorporation of Fe particles. Key words: composite lead-free solder; Sn-3Ag-0.5Cu; viscosity; wettability; shear strength 为进一步开发新型无铅钎料和改善现有无铅钎料性能,复合无铅钎料的研究已成......
; Abstract: Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit... principle and assumptions 2.1 Strength reduction technique Strength reduction technique was proposed by BISHOP in 1955 [15]. The shear strength parameters (c and φ) are divided by slope safety factor......
between granularity dimension and shear strength of earth-rock aggregate was discussed by large three axes tests. The results show that earth-rock aggregate has self-similar in statistics which often has... or strength property of earth-rock aggregate can be displayed with curves of parabola. Earth-rock aggregate with only 1-D fractal has the largest compactedness and shear strength. Key words: earth-rock......
