柔性泡沫聚合材料.硬度的测定(压痕法

[中文适用范围]： 柔性多孔聚合物材料的压入硬度是其承载性能的度量。本国际标准规定了四种方法（A 至 D）用于测定柔性多孔材料的压入硬度，以及一种方法（E）用于测定柔性多孔材料的压缩变形系数和滞后损耗率。附录 A 提供了这些方法获得的测试参数摘要和典型的力 - 压入曲线图。这五种方法仅适用于开孔类型的乳胶泡沫、聚氨酯泡沫和 PVC 泡沫。规定的方法可用于测试成品和表征散装材料。本国际标准规定了以下方法：a) 方法 A——40%/30 s 压入硬度指数的测定，为实验室测试目的提供单个压入测量值；b) 方法 B——25%-40%-65%/30 s 压入硬度特性的测定，提供关于压入硬度曲线形状的信息；c) 方法 C——40% 压入硬度检查的测定，是一种适用于质量控制测试的快速程序；d) 方法 D——25%/20 s 低压入硬度指数的测定，是一种适用于检验测试的快速程序；e) 方法 E——压缩变形系数和滞后损耗率的测定，提供有关材料承载性能的额外信息。通过这些方法获得的结果仅与规定的测试条件有关，通常不能直接用于设计目的。 [外文原描述]： The indentation hardness of flexible cellular materials is a measure of their load-bearing properties. ISO 2439:2008 specifies four methods (A to D) for the determination of indentation hardness and one method (E) for determination of compressive deflection coefficient and hysteresis loss rate of flexible cellular materials. Annex A provides a summary of test parameters and typical force-indentation graphs obtained with these methods. These five methods are applicable only to latex foam, urethane foam and PVC foam of the open-cell type. The methods specified can be used for testing finished articles and for the characterization of bulk material. ISO 2439:2008 specifies the following methods: Method A — Determination of the 40 %/30 s indentation hardness index, which gives a single indentation measurement for laboratory test purposes; Method B — Determination of the 25 %-40 %-65 %/30 s indentation hardness characteristics, which provides information about the shape of the hardness indentation curve; Method C — Determination of the 40 % indentation hardness check, which is a quick procedure suitable for quality control testing; Method D — Determination of the 25 %/20 s low indentation hardness index, which is a quick procedure suitable as an inspection test; Method E — Determination of the compressive deflection coefficient and hysteresis loss rate, which gives additional information about the load-bearing properties of materials. The results obtained by these methods relate only to the test conditions specified and cannot, in general, be used directly for design purposes.