剪切强度

Mechanical properties including the density MOR, MOE, shearing strength of birch and basswood LVL beams made by the bi-frequency hot press were tested by universal strength testing machine. The primary failure modes were discussed when LVL beams suffered the flexural and level shearing load.

在万能力学试验机上测试由高频热压方法制造的桦木和椴木单板层积梁的密度、静曲强度、弹性模量和水平剪切强度等力学性质；讨论LVL梁受弯曲、水平剪切载荷时的主要破坏形式并得出相关结论。

It is found that two shear modulus are different and two shear strength are almost equal. The reason of differences between three point bending modulus and four point bending modulus is also analyzed.

在剪切试验中发现两种剪切试验的剪切模量相差较大，但由于两种剪切的破坏面相同，所以剪切强度相差不大。

The shear strength can be enhanced by 2-3 orders of magnitude when the intershell spacing is reduced to 20%, which is also dependent on commensuration.

剪切强度对层间距离和公度性都很敏感。如果层间距离减小20%，剪切强度会增加2-3个数量级。

The results show that the amorphous PLGA fiber with porous structure (0.1-1.0 μm) is obtained by diluted solvent spinning method and the mechanical properties is affected by pressure and temperature. Bending strength and shearing strength of the samples increase firstly and then decrease with the increase of molding temperature and pressure. While the molding temperature is 160℃and the pressure is 105MPa, the PLGA materials possess optimal mechanical properties, bending strength, shearing strength and bending modulus 187.3 MPa, 100.0 MPa and 2.5 GPa, respectively. The mild temperature molding PLGA materials are desired to play a grate role in non-bearing internal fixation devices.

研究结果表明：非晶多孔结构的PLGA纤维可通过溶液沉析纺丝的方法获得，其孔径为0.1~1.0μm；压制压力和压制温度对材料的力学性能影响较大，材料的抗弯强度、剪切强度和抗弯模量均随着温度和压力的增大而先增大后降低；在压制压力为105MPa，压制温度为160℃时，试样的力学性能比较理想，此时，其抗弯强度可达到187.3MPa，剪切强度达到100.1MPa，抗弯模量达到2.5GPa，可望作为非承重部位骨折愈合内固定材料。

The reasons why quarter-sawn board of Larch had smaller wet compressing shear strength than flat-sawn board of Larch for repeatedly boiling samples were as follows: first of all, antiswelling efficiency between springwood and summerwood of Larch was different; secondly, pits of Larch had great effect on this aspect.

造成桦木反复煮沸压缩剪切强度径切板的比弦切板的要大的主要原因是在弦切面木射线是被横断的，因此，在弦面上留下射线管胞的孔隙，在反复煮沸时这些孔隙成为了水分的通道，因而使桦木反复煮沸压缩剪切强度径切板的比弦切板的要大。

The experimental results show that 0.2%yield she ar stress, ultimate shear stress and 0.2%yield tensile stress, ultimate tensile stress under torsion-tension combined high strain-rate decrease with increasi ng temperature.

试验结果表明：该材料在高应变率扭-拉复合加载下的名义剪切屈服强度、剪切强度极限和名义拉伸屈服极限、拉伸强度极限均随温度的升高而降低。

Fracture model and shear bond strength were not relevant. Conclusions: The shear bond strength between porcelain and electroformed copings are significantly lower than that of Ni-Cr alloy.

结果：金沉积5个处理组的金瓷剪切强度分别为6.99MPa、9.04 SPa、9.80 SPa、12.19 SPa、12.86 SPa，低于Ni-Cr合金26.76 MPa(P＜0.05)；断裂模式与剪切强度之间没有相关性。

The results show that the spreading area of series Ni-P filler metal increases with the increase of brazing temperature, and the spreading areas of Ni-P filler metal is larger than that of Ni-Cr-P filler metal; the shear strength of the brazed joint at room temperature increases with the increase of temperature from 925℃ to 1000℃, and the shear strength of the stainless steel joint brazed with Ni-P filler metal is superior to that with Ni-Cr-P filler metal by 30~40 MPa in the same brazing technology.

结果表明，Ni-P系钎料铺展面积随钎焊温度的升高而增大，并且相同温度下不含Cr的Ni-P钎料铺展面积大于Ni-Cr-P的铺展面积；钎焊温度从925 ℃升高到1000 ℃过程中，Ni-P、Ni-Cr-P钎料钎焊不锈钢接头的室温剪切强度均增大，并且在相同钎焊工艺下，不含Cr的Ni-P钎料钎焊不锈钢接头室温剪切强度优于Ni-Cr-P钎焊接头强度30~40 MPa；Ni-P系钎料钎焊接头高温强度随温度升高而下降，测试温度超过500 ℃时，相同温度下含Cr的钎料能够提高钎焊接头强度0~30 MPa。

Through a great number of experiments, the paper put forward to shear test index of graded broken stone with self-invented instrument, analyzes its influence rule by varying gradation, water content, compactness, shear rate and lateral compression; studies systematically the changing rule of CBR, infiltration index and thermal conductivity by gradation; works out the suitable biggest particle size, key screen openings and range of their reasonable percentage passing; put forward to graded broken stone design methodology based on CBR and shear strength and construction method in perennially frozen soil zone.

本文通过大量试验，利用自行研发设备，提出了级配碎石的抗剪切性能指标，分析了级配、含水量、密实度、剪切速率、侧压力对抗剪切性能的影响规律；系统研究了级配对CBR值、渗水性能、导热性能的影响规律；通过CBR试验和抗剪切试验，得到了最佳级配最大粒径和关键筛孔及其通过率合理变化范围；提出了基于CBR值和剪切强度双指标控制的级配碎石组成设计方法及适宜多年冻土地区的施工工艺。

Three composites of the different fibers with epoxy resin matrix are prepared and the corresponding unilateral fiber reinforced winding ring specimens are fabricated. The mechanical poperties of the composites including tensile strength, modulus and three point interlaminar shear strength are te...

对由PBO纤维与环氧树脂基体复合成型的单向纤维增强环形试样，测试了其拉伸强度、弹性模量和层间剪切强度，结果表明：PBO纤维股纱的拉伸强度比F - 12和Kevlar - 4 9分别高 2 4 4 %和 5 2 8%以上，单向纤维复合材料的拉伸强度分别高约 37 2 %和 92 8%，耐热性也高约 166℃，但PBO纤维与环氧树脂基体的界面粘结性很差，层间剪切强度仅为 2 3～ 2 7MPa 。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失