ISO 7743:2011 硫化橡胶或热塑性橡胶 压缩应力-应变性能的测定

标准编号：ISO 7743:2011

中文名称：硫化橡胶或热塑性橡胶 压缩应力-应变性能的测定

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

发布日期：2011-11

标准范围

ISO 7743:2011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压缩应力应变特性的方法。给出了四个步骤:使用金属板润滑的标准试件A（方法A）；使用标准试件A，将金属板粘合到试件上（方法B）；使用标准试件B（方法C）；使用金属板润滑的产品或产品的一部分（方法D）。这四种方法得出的结果并不相同。方法A（试样A，润滑）给出的结果仅取决于橡胶的模量，且与试样形状无关，前提是达到完全滑动条件。然而，有时很难实现有效润滑，谨慎的做法是检查重复试样试验结果的差异，以确定是否存在不稳定滑动条件的迹象。方法B（粘结试样A）给出的结果取决于橡胶模量和试样形状。对试件形状的依赖性很强，因此结果与润滑试件的结果明显不同。方法C（试样B）给出的结果与试样形状和润滑条件无关。在确定材料固有特性时，该试件更合适、更方便。对于产品（方法D），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。规定使用与规定试样不同尺寸和/或形状的试样，但不可能将获得的结果外推到其他尺寸和形状。附件中给出了有关试样尺寸和形状以及粘合或润滑效果的信息。该方法不适用于具有高凝固性的材料。

ISO 7743:2011 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.Four procedures are given: using standard test piece A with the metal plates lubricated (method A); using standard test piece A with the metal plates bonded to the test piece (method B); using standard test piece B (method C); using a product or a part of a product with the metal plates lubricated (method D).The four procedures do not give the same results. Method A (test piece A, lubricated) gives results which 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. Method B (test piece A, bonded) gives results which 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 are markedly different from those obtained with lubricated test pieces. Method C (test piece B) gives results which are independent of both the test piece shape and the lubrication conditions. This test piece is more appropriate and more convenient when intrinsic material properties are to be determined. For products (method D), the result is dependent on the shape, but as tests on products are mainly comparative this is acceptable.Provision is made for the use of test pieces of different size and/or shape from the specified test pieces, but extrapolation of the results obtained to other sizes and shapes can prove impossible.Information on the effect of size and shape of test piece and of bonding or lubrication is given in an annex.The method is not suitable for materials that exhibit high set.

标准预览图