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Research,standardization and practice in accelerated ageing tests

机译：加速老化测试的研究，标准化和实践

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The increasing use of polymers in various technological environments requires understanding of the degradation phenomena and ultimately controlling them.Questions associated with performance,cost,durability and environmental effects are closely related to each other and must be answered before the industry and the consumers can adopt new materials.Often,the use of accelerated ageing tests constitutes the only possibility to produce measurable degradation and the desired materials assessment.However,prediction of service life,especially for materials expected to perform reliably for many decades,is a continuing challenge,which contains many pitfalls.In this paper,examples of the many years' work with accelerated ageing tests and lifetime predictions carried out at SP Swedish National Testing and Research Institute are used to demonstrate some problems and pitfalls that can be met with in practice.Some examples are also given on insufficient information in international standards for ageing tests.Special attention is given to prediction of service life with one data point only as well as the influence of different previous history,different environments and different evaluation methods on lifetime prediction.Other examples concern the use of high stress levels and physical depletion of stabilizers.
机译：在各种技术环境中越来越多地使用聚合物，需要了解降解现象并最终加以控制。与性能，成本，耐用性和环境影响相关的问题彼此密切相关，在行业和消费者采用新产品之前必须予以回答。通常，使用加速老化测试是产生可测量的降解和进行所需材料评估的唯一可能性。但是，使用寿命的预测，尤其是对于预期能够可靠运行数十年的材料，是一个持续的挑战，其中包含许多本文以SP瑞典国家测试研究所进行的多年加速老化测试和寿命预测工作为例，以说明在实践中可以解决的一些问题和陷阱。在国际年龄标准中没有足够的信息仅关注一个数据点的使用寿命预测，以及不同的先前历史，不同的环境和不同的评估方法对寿命预测的影响。其他示例涉及高应力水平的使用和轮胎的物理损耗稳定剂。

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