拉伸断裂

After exposure to the carbon arc lamp, the PBO fiber strength reduces. However, the paragliding cord made by the core materials are made of 4 ply PBO fibers and the cover material are made out of 8 ply HDPET fibers is the best strength.

PBO纤维经碳弧光连续照射后其断裂拉伸强力有明显下降，因此选用高强力聚酯纤维作为编织飞行伞伞绳的包覆材，同时选用PBO纤维作为芯材。

The mechanical properties of the modified material were tested, and the thermal stability of the modified EP blend was also investigated by TG. The results indicate that the graft copolymerization between PU and EP effectly inforces the miscibility of the PU/EP system. Compared with the properties of pure EP, the impact strength and tensile strength of the PU/EP with high thermal stability are markedly enhanced, and the fracture surface of the PU/EP system displays tough fracture features.

研究结果表明：PU和EP分子链之间存在着化学接枝反应，能有效地改善PU/EP体系中PU和EP分子间的相容性及相互贯穿；与TDE-85与E-51的混和环氧树脂比，PU改性TDE-85与E-51的混和环氧树脂仍然具有很强的耐热性能，并且冲击强度、拉伸强度均获得显著提高；PU/EP体系断口裂纹呈明显的韧性断裂特征，说明TDE-85与E-51的混和环氧树脂PU改性增韧效果明显。

The fracture reason of the spline shaft was analyzed by fracture observation, chemical composition analysis, metallurgical structure observation, hardness test and tensile test.

摘要对断裂的花键轴进行了断口宏微观观察、化学成分分析、金相组织检查、硬度检测及静态拉伸测试。

Through solution blending, the tension properties of PHBV were improved. The ε〓 was more than 350%, but its σy was lower.

经过溶液共混，PHBV的拉伸性能得到改善，断裂伸长率从11％提高到350％以上，屈服应力明显下降。

With increasing MAH-g-PP contents, the tensile strengths in bot h dry and wet states and the Young's modulus in dry state increased, while the Young's modulus in wet state, the elongation at break and the impact str engths in both states remained unaffected.

在相容剂PP- g -MAH用量一定时，随着PA6/PP合金体系中PA6组分含量的提高，合金在干、湿态条件下的冲击强度、拉伸强度、断裂伸长率均呈近似线性变化。

Onset decomposition temperature of the polyimide was at 508 ℃ under nitrogen atmosphere, and its glass-transition temperature was at 288 ℃. The polyimide film had strengths at break at 91 MPa, elongations to break of 10%～15%, and initial moduli at 1.7 GPa.

此外该聚醚酰亚胺还表现出良好的热性能和机械性能：玻璃化转变温度在288 ℃，氮气中起始分解温度在508 ℃；该聚合物薄膜的拉伸强度为91 MPa，断裂伸长率在10%～15%，起始模量为1.7 GPa。

The results showed that CoPI films were amorphous state and their glass-transition temperatures T(subscript g and decomposition temperatures T(subscript d respectively occurred above 322℃ and 544℃. At the same time, the tensile strengths of CoPI films reached beyond 100MPa and breaking elongations were improved from 12% to 54%, but the average of tensile modulus was reduced by 29%. However, polyimide blends had about the same structures and properties with PMDA/ODA-polyimide.

结果表明，CoPI薄膜为非晶态结构，玻璃化转变温度和起始分解温度分别在322℃和544℃以上，断裂伸长率由12%平均提高到54%，拉伸强度均超过100MPa，但弹性模量平均降低了29%；共混PI的聚集态结构和性能与PMDA/ODA型PI相近。

The bulk resistivity of the conductive polyethylene composite was 0.2 Ω·cm.The tensile strength was 47.6 MPa and the percent elongation at break was 1.6%.The conductive composite was solution impermeable and corrosion resistant.The SEM micrograph indic...

结果表明，聚乙烯复合导电塑料的体积电阻率达到0.2Ω。cm，拉伸强度为47.6 MPa，断裂伸长率1.6%，同时具有不渗液、耐腐蚀等特性，SEM观察表明，聚乙烯复合导电塑料中形成了导电网络，适合用作钒电池的集流体。

On the basis of the shear-lag theory,this paper studies the microstress redistributions induced by the interaction of failure of 90° layers and the breakage of some fibers in 0° layer in cross-ply laminates under tension in 0° direction.

摘 要 基于剪滞理论，研究了在0°方向承受拉伸的复合材料正交叠层板由90°层的破坏及0°层中部分纤维断裂相互作用所导致的细观应力重新分布。

The stress redistributions induced by the fracture of some fibers and matrix elements for unidirectionally fiber-reinforced composites subjected to axial tension at cryogenic temperature were studied.

研究了在低温情形下受纵向拉伸荷载作用的单向纤维增强复合材料由部分纤维及基体断裂所导致的应力重新分布。

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％。