Finally, the tensile stress relaxation of rock and the accuracy of computation are also mentioned.

It is indicated that the main factors affecting tensile stress relaxation test at normal atmospheric temperature are the type and precision of tester, loading process of sample, test temperature and data disposal.

指出影响常温拉伸应力松弛试验的主要因素有试验机的类型和精度，试样的加荷过程，试验的温度及数据处理。

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Meimei has a yellow schoolbag.

美美有个黄书包。

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Methods The average dissecting force ( ADF) and interlamellar shear stress of each interspace in the media were measured using a tensile strength tester, and the the final shape-changed strength ratio of each layer was calculated before and after melting the tissue with collagenase and elastase.

方法测定人主动脉中膜各层间单位分离力、剪应力和胶原酶和弹力蛋白酶酶解前后主动脉壁各层的屈服形状改变比能。

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Fibre tensile strength tester

纤维拉伸强力试验仪

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Bolting mechanical properties are tested by the tensile strength tester, impact tester and hardness testers, to guarantee the detect precision.

连接副机械性能检测，采用微机控制的拉力机、冲击试验机及各种硬度计以保证测试精度。

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When the tensile stress of the core layer is bigger than the tensile strength perpendicular to grain of wood, the internal crack will appear.

心层的拉伸应力与木材内裂有关，当心层拉伸应力超过木材横纹拉伸极限强度时，木材产生内裂。

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Method of testing in tensile strength perpendicular to grain of wood

GB/T14017-1992木材横纹抗拉强度试验方法

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The basic density, compression strength parallel to the grain, and tensile strength parallel to the grain and bending strength increase with the age, and reach their relative stableness values at the age of 3-5 years.

基本密度、顺纹抗压强度、顺纹抗拉强度和抗弯强度都随竹龄增加而增加，至3～5年较稳定。

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The CNC processing technology of the wood testing part in tensile strength parallel to the grain

模板的加工橄榄球的加工木材顺纹抗拉强度试件的数控加工技术

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Because of the constraint of experimental equipment and technology, there are quite few studies on the crack propagation mechanism of rock mass under tensile stress. Compared to the compressive strength, the tensile strength of rock mass is very low.

目前压缩条件下岩体中三维裂隙扩展演化机制的试验研究已有一些，但由于试验设备和技术方面的制约，拉伸条件下相应的成果很少。

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When the pressure reaches the breaking pressure, along the direction of the arrangement hole, the Y-direction tensile stress exceeds the tensile strength of the rock, so rock fracture.

当压力达到破坏压力时，模型沿布置孔的方向的Y方向拉应力超过了岩石的抗拉强度，岩石破裂。

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Testing results indicate that the threshold pressure of jet aided drilling is 4.1 times of rock tensile strength and 26% of rock compressive resistance, also related with the bottom hole pressure difference and rock physical properties.

实验结果表明，射流辅助钻井的门限压力是岩石抗拉强度的4.1倍，是抗压强度的26%；还与井底压差及其它岩石物理力学性质有关。

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The point load testing as a simple, rapid, reliable and cheap method can determine indirectly the tensile and compressive strength of rock in the field.

岩石的点荷载实验法简便、迅速、可靠、成本低，能在现场间接确定矿岩抗拉强度与抗压强度。

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The tensile strength of the rock is not only one of the indicators of the important mechanical properties of the rock, but also a controlling parameter of the security and stability analysis in rock structure design.

岩石的抗拉强度是岩石的重要力学性质指标之一，也是岩石结构设计中安全与稳定性分析的一个控制性参数。

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And the density, cohesion, internal friction angle, compressive and tensile strength of the rock in XinQiao Pyrite iron mine are determined. 3.

测出了矿区主要矿岩体的密度、内聚力、内摩擦角、单轴抗压强度和抗拉强度等物理力学参数。

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Diametral point load test is a very promising, simple and accurate method for obtaining compressive and tensile strength data of rock core.

用岩芯进行径向点荷试验，是简单而较精确地获得岩石抗拉、抗压强度的极有前途的方法。

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An Experimental Study on Tensile Strength of Irregular Rock Sample by Sleeve Fracturing Technique

不规则岩石试件抗拉强度的套筒致裂试验研究

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The tensile strength of rock is the ability to resist tensile stress in the rock specimen as a role of external load and ultimate load in the tensile failure of rock specimen with pull-sectional area.

岩石抗拉强度是指岩石试件在外荷载的作用下抵抗抗拉应力的能力，为岩石试件在拉伸破坏时的极限荷载与受拉截面面积的比值。

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This method takes full advantage of the low tensile strength of rock and high permeating ability of high pressure water which enable the initiation and propagation of cracks and the accomplishment of rock fragmentation.

本方法充分运用了岩石抗拉强度低，和高压水对岩石有利渗透作用的条件，从而达到岩石裂纹的产生与扩展，直到最后劈裂。

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Numerical results denoted that the dynamic failure processes are controlled by three factors: i.e. tensile strength of rock, amplitudes of stress waves and waveforms of stress waves.

数值模拟表明，在应力波作用下的岩石破裂取决于三个因素：材料的抗拉强度、应力波的应力幅值以及应力波的波形。

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