ISO 6943:2007 硫化橡胶 拉伸疲劳的测定

标准编号：ISO 6943:2007

中文名称：硫化橡胶 拉伸疲劳的测定

英文名称：Rubber, vulcanized — Determination of tension fatigue

发布日期：2007-06

标准范围

ISO 6943:2007描述了一种测定硫化橡胶在反复拉伸变形下抗疲劳性的方法，试样尺寸和循环频率应确保几乎没有或没有温升。在这些条件下，失效是由裂纹的扩展导致的，裂纹最终会切断试件。该方法仅限于重复变形，其中试件在每个循环的一部分放松至零应变。在不通过零应变的重复变形下，以及在某些橡胶中，在静态变形下，也可能发生类似的疲劳过程，但本国际标准不适用于这些条件。该方法被认为适用于至少在循环一段时间后具有合理稳定的应力-应变特性，且不表现出过度应力软化或凝固或高粘性行为的橡胶。从实验和解释的角度来看，不符合这些标准的材料可能会带来相当大的困难。例如，该方法不适用于大多数热塑性弹性体。

ISO 6943:2007 describes a method for the determination of the resistance of vulcanized rubbers to fatigue under repeated tensile deformations, the test piece size and frequency of cycling being such that there is little or no temperature rise. Under these conditions, failure results from the growth of a crack that ultimately severs the test piece.The method is restricted to repeated deformations in which the test piece is relaxed to zero strain for part of each cycle. Analogous fatigue processes can occur under repeated deformations which do not pass through zero strain and also, in certain rubbers, under static deformation, but this International Standard does not apply to these conditions.The method is believed to be suitable for rubbers that have reasonably stable stress-strain properties, at least after a period of cycling, and that do not show undue stress softening or set, or highly viscous behaviour. Materials that do not meet these criteria may present considerable difficulties from the points of view of both experiment and interpretation. For example, the method is not considered suitable for most thermoplastic elastomers.

标准预览图