Data set generation for lifetime assessment of short fibre reinforced polymers

Primetzhofer, Andreas; Stadler, Gabriel; Pinter, Gerald; Grün, Florian

doi:10.3139/o999.01012019

Cited by 2 publications

(4 citation statements)

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“…Figure 11. Evaluation of the normalized tip-modulus s E , dynamic modulus dyn E and temperature T. These two curves can be easily implemented in a data set [32] and enable the consideration of stress-rearrangement in a stress based lifetime assessment, according Figure 1, as well as a prediction following strain based approaches.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Primetzhofer¹,

Stadler²,

Pinter³

et al. 2019

MSA

Self Cite

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“…Based on the test results, a data set for the lifetime estimation according to Figure 1 can be determined. The general approach for data set determination is described in [30]. To show the influence of the extraction position and therefore of the fiber orientation on the result on the data set, each possible combination of two positions is evaluated and compared to each other.…”

Section: Data Set Determinationmentioning

confidence: 99%

“…To be able to compare the actual stress to the bearable stress (stress which can be applied to reach a certain lifetime or cycles to failure), test data must be stored in some way. Primetzhofer describes in [30] a systematic approach to test and store data for the stress based lifetime estimation. In this study, the authors also describe the influence of different specimen types on the data set determination.…”

Section: Introductionmentioning

confidence: 99%

“…In literature, besides the already described fiber orientation model, an approach based on the work of Tsai-Hill, the so called "Tsai-Hill-criterion", is often used to describe the mechanical behavior in respect to the loading angle of the specimen. In [30], Azzi extends this model to fatigue loads. Since this model is not used in the described simulation, this is not further discussed here.…”

Section: Introductionmentioning

confidence: 99%

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Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

et al. 2021

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To ensure the usability of parts made of fiber-reinforced polymers, a lifetime assessment has to be made in an early stage of the development process. To describe the whole life cycle of these parts, continuous simulation chains can be used. From production to the end of the service life, all influences are mapped virtually. The later material strength is already given after the manufacturing process due to the process dependent fiber alignment. To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure. Therefore, quasi-static and cyclic tests were performed on specimens with longitudinal and transversal fiber orientation. A supplementary failure analysis provides additional information about the local micro-structure. The local fiber orientation is determined with µCT (micro computer tomography)-measurements, correlated to the extraction positions of the specimen, and implemented in a dataset. With an attached lifetime calculation on a demonstrator, a major influence of the local micro-structure on the calculation results can be shown. Therefore, it is indispensable to consider the local fiber orientation in the data set determination of short fiber reinforced polymers.

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Data set generation for lifetime assessment of short fibre reinforced polymers

Cited by 2 publications

References 0 publications

Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Applicability of Strain Controlled Cyclic Tests for Short Fibre Reinforced Polymers

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

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