ISO 179-2:2020 塑料 摆锤冲击性能的测定 第2部分：装有仪表的冲击试验

标准编号：ISO 179-2:2020

中文名称：塑料 摆锤冲击性能的测定 第2部分：装有仪表的冲击试验

英文名称：Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test

发布日期：2020-05

标准范围

1.1本文件规定了从力-挠度图确定塑料夏比冲击性能的方法。ISO 179-1中定义了不同类型的杆状试样和试验配置，以及取决于材料类型、试样类型和缺口类型的试验参数。本文件描述了动态效应，如称重传感器/撞针共振、试样共振和初始接触/惯性峰值（见图1曲线b和附录A）。1.2 ISO 179-1适用于仅通过冲击强度表征冲击行为，并适用于使用势能与待测特定断裂能大致匹配的仪器（见ISO 13802:2015，附录E）。该文件用于记录力-偏转或力-用于详细表征冲击行为和开发自动设备的时间图，即避免匹配能量的需要。本文所述的方法也适用于:-在冲击条件下获得更多和不同的材料特性；-监督夏比测试程序，因为该仪器允许检测典型的操作错误，例如样本没有与支撑件紧密接触；-自动检测中断的类型；-摆式仪器，避免频繁更换摆锤；-测量其他ISO标准中描述的断裂机械性能。1.3可通过本方法检测的材料范围见ISO 179-1:20 10，第1条。1.4试验结果的一般可比性见ISO 179-1:20 10，第1条。1.5关于材料典型行为的信息可以通过在不同温度下测试、通过改变缺口半径和/或试样厚度以及通过测试在不同条件下制备的试样来获得。本文档的目的不是解释力-挠度图上每个点发生的机制。这些解释是正在进行的科学研究的任务。1.6只有在试样制备条件以及试验条件相同的情况下，本方法获得的试验结果才具有可比性。因此，成品的冲击行为不能直接从该测试中预测。

1.1 This document specifies a method for determining Charpy impact properties of plastics from force-deflection diagrams. Different types of rod-shaped test specimens and test configurations, as well as test parameters depending on the type of material, the type of test specimen and the type of notch, are defined in ISO 179-1.Dynamic effects such as load-cell/striker resonance, test specimen resonance and initial-contact/inertia peaks are described in this document (see Figure 1, Curve b, and Annex A).1.2 ISO 179-1 is suitable for characterizing the impact behaviour by the impact strength only and for using apparatus whose potential energy is matched approximately to the particular energy to break to be measured (see ISO 13802:2015, Annex E). This document is used to record a force-deflection or force-time diagram for detailed characterization of the impact behaviour, and for developing automatic apparatus, i.e. avoiding the need to match energy.The method described in this document is also suitable for:— acquiring more and different materials characteristics under impact conditions;— supervising the Charpy test procedure, as this instrumentation allows detection of typical operational mistakes, such as the specimen not being in close contact with the supports;— automatically detecting the type of break;— pendulum type instruments to avoid frequent changes of pendulum hammers;— measuring fracture mechanical properties described in other ISO standards.1.3 For the range of materials which can be tested by this method, see ISO 179-1:2010, Clause 1.1.4 For the general comparability of test results, see ISO 179-1:2010, Clause 1.1.5 Information on the typical behaviour of materials can be obtained by testing at different temperatures, by varying the notch radius and/or specimen thickness and by testing specimens prepared under different conditions.It is not the purpose of this document to give an interpretation of the mechanism occurring at every point on the force-deflection diagram. These interpretations are a task for on-going scientific research.1.6 The test results obtained with this method are comparable only if the conditions of test specimen preparation, as well as the test conditions, are the same. The impact behaviour of finished products cannot, therefore, be predicted directly from this test.

标准预览图