ISO 21971:2019标准是一项针对陶瓷复合材料的标准，主要用于测定管材的环向拉伸性能。该标准的目的是提供一种可靠的方法来评估陶瓷复合材料的环向拉伸性能，以便在实际应用中更好地了解其性能和可靠性。

该标准的适用范围包括陶瓷复合材料在常温下空气大气压下的环向拉伸性能测定。该标准的测试方法基于ASTM D2290-15标准，但是在测试过程中需要注意一些特殊的要求。

在测试过程中，需要使用一台环向拉伸试验机来进行测试。测试样品需要满足一定的尺寸要求，并且需要进行表面处理以确保测试结果的准确性。测试过程中需要记录一系列数据，包括应力-应变曲线、最大应力、断裂应变等。

该标准的实施可以帮助制造商和用户更好地了解陶瓷复合材料的环向拉伸性能，以便在实际应用中更好地选择和使用这些材料。此外，该标准还可以为陶瓷复合材料的研究和开发提供参考。

相关标准
- ISO 14704-1:2008 Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure — Part 1: Determination of tensile properties
- ISO 14704-2:2008 Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure — Part 2: Determination of compressive properties
- ISO 14704-3:2008 Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure — Part 3: Determination of flexural properties
- ISO 14704-4:2008 Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure — Part 4: Determination of shear properties
- ISO 14704-5:2008 Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure — Part 5: Determination of Poisson's ratio