ISO 8256:2023 塑料 拉伸冲击强度的测定

标准编号：ISO 8256:2023

中文名称：塑料 拉伸冲击强度的测定

英文名称：Plastics — Determination of tensile-impact strength

发布日期：2023-11

标准范围

1.1？本文件规定了两种方法（方法？a和方法？B）用于在规定条件下测定塑料的拉伸冲击强度。这些试验可以被描述为在相对高应变率下的拉伸试验。这些方法可用于刚性材料（如ISO？472中所定义），但对于太柔韧或太薄而无法通过符合ISO？472的冲击试验进行测试的材料尤其有用。179系列还是ISO？180.1.2？这些方法用于研究特定试样在特定冲击速度下的行为，并在试验条件固有的限制范围内估计试样的脆性或韧性。1.3？这些方法既适用于由模制材料制备的试样，也适用于从成品或半成品中取出的试样。成品（例如模制件、层压板或挤出或铸造板材）。1.4？通过测试不同尺寸的模制样品获得的结果不一定相同。同样，从模制产品切割的试样可能不会给出与直接从材料模制的相同尺寸的试样相同的结果。由模制化合物制备的样品获得的测试结果不能直接应用于任何给定形状的模制件，因为数值可能取决于模制件的设计和模制条件。方法获得的结果？一个和方法？B可以是可比的，也可以不是可比的。1.5？这些方法不适合用作部件设计计算的数据源。然而，可以通过测试在不同条件下制备的不同类型的测试样本以及通过在不同温度下测试来获得关于材料的典型行为的信息。这两种不同的方法适用于生产控制以及质量控制。

1.1     This document specifies two methods (method A and method B) for the determination of the tensile-impact strength of plastics under defined conditions. The tests can be described as tensile tests at relatively high strain rates. These methods can be used for rigid materials (as defined in ISO 472), but are especially useful for materials too flexible or too thin to be tested with impact tests conforming to the ISO 179 series or ISO 180.

1.2     These methods are used for investigating the behaviour of specified specimens under specified impact velocities, and for estimating the brittleness or the toughness of specimens within the limitations inherent in the test conditions.

1.3     These methods are applicable both to specimens prepared from moulding materials and to specimens taken from finished or semi-finished products (for example mouldings, laminates, or extruded or cast sheets).

1.4     Results obtained by testing moulded specimens of different dimensions are not necessarily the same. Equally, it is possible that specimens cut from moulded products will not give the same results as specimens of the same dimensions moulded directly from the material. Test results obtained from specimens prepared from moulding compounds cannot be applied directly to mouldings of any given shape, because values may depend on the design of the moulding and the moulding conditions. Results obtained by method A and method B can or can not be comparable.

1.5     These methods are not suitable for use as a source of data for design calculations on components. Information on the typical behaviour of a material can be obtained, however, by testing different types of test specimen prepared under different conditions, and by testing at different temperatures. The two different methods are suitable for production control as well as for quality control.

标准预览图