Lifetime prediction of polymers and polymer matrix composite structures: Failure criteria and accelerated characterization

Guedes, Rui Miranda

doi:10.1016/b978-0-08-102601-4.00009-6

Cited by 11 publications

(3 citation statements)

References 52 publications

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“…As the creep of polymers is very sensitive to the test conditions, higher temperatures can be applied to the samples in order to accelerate the mechanical loading degradation, in contrast to the tests performed for extended periods of time at lower temperatures. 34 The TTSP was first introduced by Leaderman, 35 but Tobolsky and Andrews 36 pioneered the construction of the master curve obtained by superimposing the individual creep compliance vs. log (time) curves for various temperatures into a single reference curve. This procedure is illustrated in Figure 5, where the compliance curves obtained for different temperatures are individually shifted horizontally along the abscissa axis by a shift factor of a T , fitting to the creep compliance curve obtained for the reference temperature T 0 .…”

Section: Time-temperature Superposition Principlementioning

confidence: 99%

“…Non-linear creep behaviour is found in many practical applications due to the large stresses and elevated temperatures of materials, resulting in significant changes in the mechanical properties of polymers because of their high level of molecular mobility. 34 Once T g is reached, a nonlinear response is very accentuated and therefore the application of TTSP is limited, which introduces difficulties in the prediction of the creep behaviour.…”

Section: Time-temperature Superposition Principlementioning

confidence: 99%

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Creep behaviour of adhesively bonded joints: A comprehensive review

Carneiro Neto,

Akhavan-Safar,

Sampaio

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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This review paper provides an exploration of various facets of creep behaviour in adhesives and adhesive joints, encompassing experimental procedures, prediction models, influential parameters and strategies to enhance resistance. The discussion extends to the interplay between fatigue and creep, emphasising recent advances over the last two decades. While avoiding redundancy with prior work on temperature and moisture degradation, the paper articulates connections between topics for a better understanding. A critical examination of load levels reveals that small variations significantly impact the creep life of adhesive joints, particularly prominent with epoxy adhesives. The adhesive type, joint geometry and substrate material are scrutinised, revealing distinct impacts on creep behaviour. The study underscores the critical role of adhesive thickness and overlap length, emphasising their relevance in determining the time to failure in bonded joints under creep conditions. Notably, the substrate material’s role is highlighted. As the review delves into unexplored dimensions, it calls for further research to bridge existing gaps and refine our understanding of tertiary creep and time until failure.

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Section: Time-temperature Superposition Principlementioning

confidence: 99%

Section: Time-temperature Superposition Principlementioning

confidence: 99%

Creep behaviour of adhesively bonded joints: A comprehensive review

Carneiro Neto,

Akhavan-Safar,

Sampaio

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Besides this approach a counting number of different methods were developed to predict the lifetime of reinforced polymers. In literature an excerpt of the latest fatigue-models [10] [11] [12] [13] and techniques [14] [15] is given. Necessary models which describe the influence of fibre orientation [16] [17] [18], temperature [19] [20], notches [21] and mean stress [22] [23] [24] are already included.…”

Section: Introductionmentioning

confidence: 99%

Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Primetzhofer¹,

Stadler²,

Pinter³

et al. 2019

MSA

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To develop parts, made of short glas fibre reinforced (sgfr) polymers for industrial purposes, a comprehensive material knowledge is necessary. Especially the material behaviour under cyclic loads has a great influence on the life time of parts. Parts are often used under complex load cases (stress state, temperature, ...), therefore it is indispensable to understand the effect of the main influence factors. High loads within load histories as well as stress concentrations can lead to plastic deformations. To cover this in an early stage of the development process, a closed simulation chain should be established. Therefore, the applicability of common material models (e.g. fatigue criteria according to Ramberg-Osgood) has to be studied first, the models have to be adapted or even new models have to be found for sgfr materials. This work focuses on the applicability of strain controlled cyclic tests for glass fibre reinforced polymers. Hereby the cyclic stress rearrangement in the low cycle regime of the S/N-curve can be described. Therefore, tests were performed on a 50 wt% sgfr partial aromatic polyamide. For the fatigue tests un-notched, injection moulded specimen were used. The tests show a principal applicability of strain controlled LCF-tests for sgfr polymers.

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