ISO 7743:2008 硫化橡胶或热塑性橡胶 压缩应变特性的测定

标准编号：ISO 7743:2008

中文名称：硫化橡胶或热塑性橡胶 压缩应变特性的测定

英文名称：Rubber, vulcanized or thermoplastic — Determination of compression stress-strain properties

发布日期：2008-05

标准范围

ISO 7743:2008规定了使用标准试件、产品或产品的一部分测定硫化橡胶或热塑性橡胶的压缩应力-应变特性的方法。给出了三种方法:使用金属板润滑的标准试件；使用标准试件，其中金属板结合到试件上；使用金属板润滑的产品或产品的一部分。这三种方法给出的结果并不相同。对于润滑的试件，结果仅取决于橡胶的模量，而与试件形状无关，前提是达到完全滑动条件。然而，有时很难实现有效的润滑，谨慎的做法是检查重复试件的测试结果的差异，以寻找不稳定滑动条件的迹象。对于粘结试件，结果取决于橡胶的模量和试件形状。对试件形状的依赖性很强，因此结果将明显不同于用润滑的试件获得的结果。对于产品，结果取决于形状，但由于对产品的测试主要是比较性的，这是可以接受的。注意对于指定良好的产品形状，如O？环，结果可以与硬度值相关联。这些方法不适用于表现出高凝固性的材料。

ISO 7743:2008 specifies methods for the determination of the compression stress-strain properties of vulcanized or thermoplastic rubber using a standard test piece, a product or a part of a product.Three methods are given:

• using a standard test piece with the metal plates lubricated;
• using a standard test piece with the metal plates bonded to the test piece;
• using a product or a part of a product with the metal plates lubricated.

The three methods do not give the same results. With lubricated test pieces, the results are dependent only on the modulus of the rubber and are independent of the test piece shape, provided that complete slip conditions are achieved. Effective lubrication is sometimes difficult to achieve, however, and it is prudent to inspect the variance in the test results from replicate test pieces for indications of erratic slip conditions. With bonded test pieces, the results are dependent on both the modulus of the rubber and the test piece shape. The dependence on test piece shape is strong and consequently the results will be markedly different from those obtained with lubricated test pieces. For products, the result is dependent on the shape, but as tests on products are mainly comparative this is acceptable.NOTE For well-specified product shapes, such as O？rings, the result may be correlated to the hardness value.The methods are not suitable for materials that exhibit high set.

标准预览图