单向拉伸

The tensile properties of pure glass fiber unidirectional composites prepared under different conditions are analyzed.

同时对不同制作条件下纯玻璃纤维单向复合材料的拉伸性能进行剖析。

Based on linear elastic fracture theory, a damage evolution equation for composite soild propellant under uniaxial tension is derived. Main mecrosopic of material are determined through fittin the experiment data of constant rate tension. Then, the integrate constitutive equations found is close to microlevel.

基于线弹性断裂理论，提出了一个适合复合固体推进剂的脱湿微裂纹损伤发展方程，通过部分单向定速拉伸试验数据拟合确定其主要的细观参数，从而得到了复合固体推进剂在细观水平上完整且封闭的本构方程组。

In order to solve the experimental problem of tricrystal,elastic stress distribution of copper tricrystal under monotonical loading was analyzed by finite element method,the shear stress on slip system in each grain was analyzed.

采用有限单元法计算三晶体在单向拉伸载荷作用下弹性阶段的应力场，分析了三晶体中各晶粒主滑移系上的切应力分布，计算结果表明，当晶界平行于加载轴时，该晶界对其两侧晶粒有很明显的作用，较大程度的改变晶粒滑移系的形式，而且作用程度要超过三晶交点的作用，倾斜晶界则没有明显的作用。

In the rest of this chapter, a series of tensile tests were carried out at room and low (77K) temperatures for a variety of composite specimens which included unnotched and notched, as well as unidirectional or with a number of stacking sequences.

在本章其余部分，对各种复合材料试样（包括无缺口，有缺口，单向或各种铺层）进行了室温和低温（77K）下的拉伸试验研究。

Basing on the realities mentioned above, the contents of this paper are as follows:First, the paper is summarized the results of tension test on geosynthetics. Then the paper presents the contents and results of tension properties on uniaxial oriented geogrid, warp knitting geogrid, woven geotextile and unwoven geotextile.

首先，归纳总结国内外土工合成材料拉伸试验的研究成果，通过室内试验研究常用的加筋材料——单向土工格栅、经编土工格栅、有纺土工布和无纺土工布的拉伸特性。

Progress of recent studies on the deformation mechanism for spherulites of isotactic polypropylene in the uniaxial and biaxial orientation process was introduced.

介绍了近来国内外对单向、双向拉伸过程中全同立构聚丙烯晶体内部球晶形变机理的研究进展。

The stress distribution on the cross section of geotextile with a circle or an ellipse or a square hole under uniaxial tension or double-axial tension was calculated with boundary element method program. The results show that the stress concentration appear at the range from the hole side to about 3 times of the hole diameter, and the degree of stress concentration near the hole is related to the shape of the hole, the size of the hole, the position of the hole and the dimension of the specimen.

用边界元法程序分别对开有圆孔或椭圆孔或方孔的土工织物试样在单向与双向拉伸时孔截面上的应力分布情况进行了计算与分析，结果表明：土工织物孔截面上的应力集中出现在距孔边3倍左右的孔径尺寸范围内；孔边附近应力集中的程度与孔的形状、大小、位置及试样的尺寸有关。

The unidirectional kevlar/glass fiber hybrid composites are made in the present work.The longitudinal tensile strength and stretch modulus have been tested and analyzed.

本文对单向芳纶/玻璃纤维复合材料进行制作，对其纵向拉伸强度、拉伸模量和弹性伸长进行实验分析。

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 。

The corresponding relations between the strain of the static state and dynamic cycle load and the volume resistance of the short chopped carbon fibers, short chopped carbon mat, unidirectional carbon fibers reinforced vinyl resin composites is existed. The physical modes of these kinds of composites are also designed based on the experiment data. The resistance and strain of the short chopped fibers reinforced vinyl composites satisfy the equation of y =A + Bx + Cx~2 in the static strain test method and the short chopped mat reinforced vinyl composites is y = A + Bx.

短切碳纤维、短切碳纤维毡、单向碳纤维增强乙烯基酯树脂复合材料在静态和动态循环载荷下，应变与电阻之间有较好的对应性，同时根据实验数据，建立了不同条件下该复合材料应变和电阻变化规律的物理模型，短切碳纤维增强乙烯基酯树脂复合材料在静态拉伸时电阻与应变之间满足：y=A+Bχ+Cχ~2；碳纤维毡增强乙烯基酯树脂复合材料在静态拉伸破坏时电阻与应变之间满足：y=A+Bχ。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。