Erroneous or Arrhenius: A Degradation Rate-Based Model for EPDM during Homogeneous Ageing

Zaghdoudi, Maha; Kömmling, Anja; Jaunich, Matthias; Wolff, Dietmar

doi:10.3390/polym12092152

Cited by 19 publications

(1 citation statement)

References 47 publications

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“…Therefore, it is of interest to analyze how the intrinsic properties of elastomers influence their thermal aging. When elastomers are exposed to environmental conditions, their functionality in operation might be limited due to degradation [ 27 ]. The accurate prediction of the mechanical properties of polymers is important for preventing industrial accidents while operating a machine.…”

Section: Introductionmentioning

confidence: 99%

Reliability Prediction of Acrylonitrile O-Ring for Nuclear Power Applications Based on Shore Hardness Measurements

et al. 2021

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The degradation of polymeric components is of considerable interest to the nuclear industry and its regulatory bodies. The objective of this work was the development of a methodology to determine the useful life—based on the storage temperature—of acrylonitrile O-rings used as mechanical sealing elements to prevent leakages in nuclear equipment. To this aim, a reliability-based approach that allows prediction of the use-suitability of different storage scenarios (that involve different storage times and temperatures) considering the further required in-service performance, is presented. Thus, experimental measurements of Shore A hardness have been correlated with storage variables (temperature and storage time). The storage (and its associated hardening) was proved to have a direct effect on in-service durability, reducing this by up to 60.40%. Based on this model, the in-service performance was predicted; after the first three years of operation the increase in probability of failure (POF) was practically insignificant. Nevertheless, from this point on, and especially, from 5 years of operation, the POF increased from 10% to 20% at approximately 6 years (for new and stored). From the study, it was verified that for any of the analysis scenarios, the limit established criterion was above that of the storage time premise considered in usual nuclear industry practices. The novelty of this work is that from a non-destructive test, like a Shore A hardness measurement, the useful life and reliability of O-rings can be estimated and be, accordingly, a decision tool that allows for improvement in the management of maintenance of safety-related equipment. Finally, it was proved that the storage strategies of our nuclear power plants are successful, perfectly meeting the expectations of suitability and functionality of the components when they are installed after storage.

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Section: Introductionmentioning

confidence: 99%

Reliability Prediction of Acrylonitrile O-Ring for Nuclear Power Applications Based on Shore Hardness Measurements

et al. 2021

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Fatigue Behavior of Polymers

Ghaderi

Bahroloumi

Akbari

et al. 2023

Encyclopedia of Polymer Science and Technology

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Fatigue failure of rubber‐like materials has been often previously modeled with classical power‐law approaches, however with the new generation of physics‐based fatigue models, choosing the proper model depends on the material, loading condition and the computational cost users can afford. In view of the high number of validated fatigue models, it is challenging for engineers to choose a reliable fatigue model for a specific application. In service condition, reliability of elastomeric components is influenced by a variety of factors, ranging from environmental service condition to mechanical loads and compound properties. In sensitive applications, assuring the long‐term reliable performance of elastomers subjected to multiaxial variable loading is necessary to ensure the durability of the system. The purpose of this article is to review different stressors that contribute to the fatigue failure of elastomers and the associated modeling approaches used to assess their strengths and weaknesses. Additionally, this article summarizes the effect of thermal oxidation, moisture, hydrolysis, and radiation on long‐term aging of the fatigue properties of rubber, which has been studied over the last 50 years.

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