A novel approach to incorporating previous fatigue damage into a failure model for short-fibre reinforced plastics

Witzgall, Christian; Giolda, Jessica; Wartzack, Sandro

doi:10.1016/j.ijimpeng.2022.104155

Cited by 7 publications

(17 citation statements)

References 20 publications

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“…Thus, the measured residual strength, here in the static case, decreases after increasing fatigue damage induced, as Figure 2 shows [15]. Similar assessments has been published in [16][17][18]. The characteristics of the fatigue behaviour are influenced by fibre orientation, test frequency, temperature [19], or humidity [20].…”

Section: State Of the Art And Prior Worksupporting

confidence: 72%

“…At the same time, this calculation step can be used to estimate the service life that can be achieved. A more thorough explanation on the approach of damage calculation can be found in [37]. In order to use material parameters in the subsequent crash simulation, which correspond to the state of existing damage, characteristic values from pre-damaged material characterization are required.…”

Section: Mfkfaticrash: Considering Fatigue Damage In Crash Simulationmentioning

confidence: 99%

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Fatigue Damage of Short Fibre-Reinforced Thermoplastics in Crashworthiness Simulation

Witzgall,

Wartzack

2023

Applied Mechanics

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Service loads repeatedly stress components on a regular basis and lead to fatigue damage in the material. In the case of components made of short fibre-reinforced thermoplastics, which are also crash-relevant in addition to only bearing service loads, however, a significant deterioration in mechanical properties can be observed after fatigue damage has been introduced. This is where the approach presented in this paper comes in: in order to enable a realistic simulation of such components in their used conditions, the material data are assigned depending on previously determined damage. The approach, which combines the domains of highly dynamic and cyclic experiments as well as different types of numerical simulations, is tested for its performance in the present paper. For this purpose, component tests are carried out on cross-rib beams, which serve to validate the method. The novelty and uniqueness of this paper lies in the linking of fatigue life and crashworthiness considerations for short fibre-reinforced thermoplastics, which, in this case, is raised to a new level by considering the component level for the first time.

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Section: State Of the Art And Prior Worksupporting

confidence: 72%

Section: Mfkfaticrash: Considering Fatigue Damage In Crash Simulationmentioning

confidence: 99%

Fatigue Damage of Short Fibre-Reinforced Thermoplastics in Crashworthiness Simulation

Witzgall,

Wartzack

2023

Applied Mechanics

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“…In previous work, an approach was developed to investigate the fatigue behaviour of short-fibre-reinforced thermoplastics and the influence of material fatigue on the residual strength [ 13 , 14 , 15 ]. The overall approach aims at predicting the crash-relevant material behaviour and therefore also takes into account the effects of the strain rate on the failure stress.…”

Section: Modelling Residual Properties After Fatigue Damagementioning

confidence: 99%

“…In order to consider the effect of the damage parameter D on the residual strength, an approach according to Paepegem and Degrieck [ 21 , 22 , 23 ] is used, which was developed for fibre-reinforced plastics in general. This specifies:

…”

Section: Modelling Residual Properties After Fatigue Damagementioning

confidence: 99%

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Fatigue Behaviour and Its Effect on the Residual Strength of Long-Fibre-Reinforced Thermoplastic PP LGF30

Witzgall,

Gadinger,

Wartzack

2023

Materials

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It is undeniable that mechanical properties, such as the stiffness or residual strength of fibre-reinforced thermoplastics, are adversely affected by fatigue damage caused by cyclic loading. In order to quantify and predict this damage influence, a calculation approach was developed in the past for the subgroup of short-fibre-reinforced thermoplastics. In order to test and expand the applicability of this approach to the field of long-fibre-reinforced thermoplastics, the decrease in mechanical properties is investigated experimentally in this paper using PP LGF30, propylene reinforced with long glass fibres, as an example. The paper describes both the fatigue behaviour and the residual strength of the material after fatigue damage. A decrease in the residual strength of up to about 35% could be recorded. The paper also presents a modelling approach that predicts the orientation-dependent fatigue strength of the material, and furthermore allows for the calculation of its residual strength as a function of fatigue damage. The novelty of the contribution lies in the continuous modelling of fatigue behaviour for arbitrary oriented samples of long-fibre-reinforced thermoplastics and also in the prediction of its residual strength depending on previously induced fatigue damage.

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Investigation of erosion wear performance and mechanism of mold materials

Jiang

Zhai

2023

International Polymer Processing

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The surface of an injection mold is prone to erosion and wear under the impact of the filler during plastics injection molding, which leads to premature failure of the mold. The mechanism of erosion and wear of a filler on the mold has not been clarified yet. A numerical technique was employed to simulate the erosion and wear process, and the influence of environmental parameters and particle characteristics, such as erosion velocity, erosion angle, temperature, and particle shape were studied. The results showed that the erosion velocity and erosion angle are important factors that affect erosion and wear. Finally, the relationship between change of particle energy and erosion and wear of the material is studied from the perspective of energy.

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A novel approach to incorporating previous fatigue damage into a failure model for short-fibre reinforced plastics

Cited by 7 publications

References 20 publications

Fatigue Damage of Short Fibre-Reinforced Thermoplastics in Crashworthiness Simulation

Fatigue Damage of Short Fibre-Reinforced Thermoplastics in Crashworthiness Simulation

Fatigue Behaviour and Its Effect on the Residual Strength of Long-Fibre-Reinforced Thermoplastic PP LGF30

Investigation of erosion wear performance and mechanism of mold materials

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