拉伸应变

Following results have been obtained: a novel method of surface modification of transparent silicon rubber with plasma to adapt it to cell adherence and spread was developed, and a set of elastic matrix cell culture devices based on the method was developed; it is found that MSCs oriented 90 degrees to the applied cyclic strain field and aligned, the reaction of MSCs to the cyclic stretch is related to the loading regimen and aging of MSCs, cyclic strain may lead to differentiation of MSCs.

主要研究结果有：研究出利用等离子体对硅胶进行表面改性以利于细胞粘附和铺展的新方法，并基于此研制出了可动态加载的应变均匀的新型弹性基底细胞培养装置。发现MSC在受到交变拉伸加载后沿与受力垂直的方向排列的现象，该现象与加载的条件和MSC的老化程度有关，交变拉伸加载可能有促进MSC分化的趋势。

First, For the coronary artery stent, two kinds of loads, including the pressure named 〓 derivatively from the balloon and the counterforce named 〓 on the wall edge of the stent, have been taken into account in the analysis of the stent.〓 and 〓 were changing as the stent expanding. So, the expansion process of the stent could be considered as the process composing of many extremely short equilibrium processes, where 〓 and 〓 could be regarded as constants and the stresses, the strains and the displacements were obtained using NFEA in every processes. Then, the stresses, the strains and the displacements obtained in every processes or steps were added up to get the final structure of the coronary stent.

首先，解决了支架有限元分析的载荷非线性问题，认为医用心血管支架受到两种载荷的作用：球囊直接传递的压力〓和球囊对不锈钢支架丝壁边缘的反作用力〓，这两种载荷在支架分析中必须都考虑进去；〓为非线性载荷，随着支架扩张不断变化，处理时将支架扩张的整个过程看成由37个很短的平衡过程组成，在每个过程中取〓为常量，采用有限元法获得应力、应变、位移，最后将各过程的应力、应变、位移迭加起来就获得了不锈钢支架总的应力、应变和位移；本研究用变分法和有限元法模拟杆件拉伸证明了上述方法是合理的。

Focusing on the doubtable results and abnormal stress-strain curves in the tensile test of high grade line pipe body,the effect on test results of sample preparation process was analyzed,and it is considered that strain aging was the main reason caused pipe body tensile test result abnormal.

针对高钢级输送管管体拉伸性能试验中发现的异常值和异常曲线，分析了试样制备过程对试验结果的影响，认为应变时效是造成管体拉伸试验结果异常的主要原因。

Experimental results indicate that the serrations of stress-strain curve could be observed above 200℃ which resulted from dynamic recrystallization.

拉伸试验结果显示，在200℃以上的应力-应变曲线可以观察到有抖动的情形产生，这是由於材料在拉伸过程产生动态再结晶所导致。

The influence of strain speed to stress-strain curve is studied by room temperature, low strain speed, tension experiments. It is shown that the RPVC is kind of viscoplastic materials.

在材料的常温低应变速率拉伸试验的基础上，研究应变速率对应力—应变曲线的影响，研究显示：硬聚氯乙烯是粘塑性材料。

The mechanical properties and microstructure of Ti-15-3 alloy were investigated after single-stage and two-stage tensile test s at different strain rates.

研究了Ti-15-3合金以不同的应变速率进行一段拉伸与二段拉伸后的力学性能与微观组织。

The elastic modulus,tensile strength and strain to failure were high.

盘后组织拉伸强度和刚度较小但破坏应变较大；外侧组织的屈服能量高于内侧而拉伸强度和刚度无差异。

The yield point and max strain in circumferential direction are more than 70%.

而垂直管腔纵轴拉伸组的屈服点应变和最大应变较大，达70％以上。

Using the computer-controlled electronic universal testing machine to do stretching test, compressing test and bending test, along veins on the bottom stalk of Arundo donax L., the stress-strain curves under certain experimental conditions were acquired and analyzed.

该文利用微机控制电子万能材料试验机对收割期的芦竹底部的茎秆进行了顺纹拉伸、压缩、弯曲试验，获得试验条件下顺纹拉伸、压缩、弯曲的应力－应变曲线，并进行了分析。

The fractures on columned samples of N80 steel showed lots of homogeneous dimples in air and was characterized by tough fractures.

摘要分别在空气和地层水两种环境中进行了不同应变速率下N80钢的慢应变拉伸实验，并进行了断口电镜扫描分析。

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％。