拉伸断裂

Based on the tests of fracture toughness of welding seam, this paper gives a new method to evaluate the breaking strength of welding seam.

本文通过线切割缺口试样拉伸试验方法研究了带钢不同焊缝的抗断裂能力，并对焊缝抗断裂能力进行了评价。

RESULTS: SEM results showed that the fiber morphology of P(50/50) 6% nanofibers membrance was better and more uniform diameter distribution. Mechanic test indicated nanofibers membrance of P(50/50) had longer breaking elongation but smaller breaking stress than nanofibers membrance of P(75/25). Hydrophilicity of P(75/25) fibers was better. MTT results proved that 6% and 8% P(50/50) nanofibers could enhance the adhesion and proliferation of endothelial cells on the surface of materials, and the cells had the best spreading and attachment on the nanofibers.

结果：通过扫描电镜观察发现由质量分数为6%聚(50/50)制备的纤维膜具有更好的纤维形态，且直径分布均匀；拉伸力学测试显示由聚(50/50)制备的纤维膜比聚(75/25)具有更高的断裂伸长率，但断裂应力较低；细胞生物相容性实验表明猪髋动脉内皮细胞在质量分数为6%和8%聚(50/50)的纳米纤维膜上更能有效的黏附与增殖。

The means of experiments including fresh fracture surface, dislocation morphology adjacent to tensile fracture surface and longitudinal microsection of failed tensile specimen observing, Auger spectrum analysing and in-situ investigating of crack growth.

为深入研究Al—Li合金低塑性沿晶断裂的原因，论文对合金自然时效和峰值时效态的断裂行为进行了较全面的分析，所采用的实验手段包括：拉伸断口纵剖面观察、新鲜断口观察、断面俄歇能谱成分分析，裂纹扩展动态观察及断口附近位错形态观察。

It is shown that both strength and delayed fracture resistance of 42CrMoVNb steel increase when its grain size is refined from 20 m to 4 m, but they do not increase when refined to 2 m.

结果表明，随着晶粒细化， 42CrMoVNb钢的强度和缺口拉伸延迟断裂抗力逐渐提高；但当晶粒细化到2 m时，强度和延迟断裂抗力均不再提高。

The dynamic tensile tests are carried out on the pneumatic indirect bar-bar tensile impact tester. The influence of strain induced austenite transformation and deformation twins on the mechanical properties and fracture behaviors of the studied TWIP steels are investigated using LOM, XRD, SEM and TEM techniques.

动态拉伸试验在气动式间接杆杆型冲击拉伸试验机上进行，采用LOM、XRD、SEM和TEM等手段分析研究了奥氏体的形变诱发相变和形变孪晶对TWIP钢力学性能的影响，并分析了TWIP钢的断裂行为。

In the mechanical test, 20 cadaveric humeri of children fixed with formaldehyde were divided randomly into 10 groups and the compressive, tensile and bending tests were conducted.

结果得出：①整骨试件不同，其断裂强度不同；髁上部的压缩、拉伸、弯曲强度低于骨干部和外科颈；断裂多在髁上部，且尺侧边缘骨皮质首先断裂。

In this paper, the fracture behavior of nitramine propellant under different temperatures and crack lengthes has been studied through three methods, i.

本文用紧凑拉伸、三点弯曲和单边裂纹拉伸等三种实验方法对硝胺火药在不同温度和不同裂纹深度下的断裂性能进行了研究。

The tensile property was improved and then stable with the increasing content of coupling agent, however, the crupture ratio up and then down. And the tensile strength increase stey by step and electric insulation property is up and then descended with the addition of radiation agents.

结果表明，随着阻燃剂含量的增加和粒径超细化，其阻燃性能不断得到提高；而随着偶联剂含量的增加，其拉伸强度逐渐增大到一定程度后趋向稳定，断裂伸长率则先增大后下降；随着辐照剂量的增大，拉伸强度逐渐增大，电气绝缘性能先上升后下降。

The hoop tension force is axisymmetrical about the tension direction and increase from the top position to both sides. The distribution of hoop tension force is even with small friction coefficient, but will increase rapidly from top to side positions, which subsequently result in necking and fracture near the edge of gauge section.

结果表明：采用正压力线性变化假设所得的切向力分布规律与拉伸实验结果吻合较好；切向力关于拉伸方向呈轴对称分布，从正上方到两侧逐渐增大；当摩擦系数较小时，切向力分布较均匀，但当摩擦系数较大时，切向力从正上方到两侧迅速增大，试样的颈缩和断裂发生在标距段内靠近标距边缘的位置。

Tensile tests indicate that Young's modulus increases while breaking elongation decreases with increased talc content.

力学性能测试结果表明，材料的拉伸模量随其中PA6含量的增加而上升，而拉伸强度和断裂伸长率却表现出不同的变化形式。

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％。