FEM zur Berechnung von Kunststoff- und Elastomerbauteilen

Stommel, Markus; Stojek, Marcus; Korte, Wolfgang

doi:10.3139/9783446429093

Cited by 20 publications

(6 citation statements)

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“…The TM was extensively scanned and its elastomer elements were represented by the non-linear model of Yeoh (1993). Since the actual properties were not experimentally known, they were estimated, as described in (Stommel et al, 2018) with the help of the shear module. The shear module can be estimated according to (Lutz, 1990) using the Shore-A hardness, which was determined as 50.…”

Section: Finite Element Analysis (Fea)mentioning

confidence: 99%

Shock absorber friction testing on a MacPherson suspension considering realistic mounting situation

Deubel

Vincenz

Prokop

2022

Journal of Vibration and Control

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Due to the specific layout of MacPherson suspension systems, the shock absorber is subject to a varying amount of load perpendicular to its own axis of displacement and is therefore generating a certain amount of friction. Especially at the presence of lateral forces at the tire contact patch, for example, in cornering situations, additional friction is generated. In order to accurately consider the actual amount of friction regarding vehicle dynamics and comfort, it is crucial to study shock absorber friction depending on the acting shear force. However, there is a shortage of knowledge considering realistic load situations of the shock absorber as present in the vehicle. Consequently, no commonly established test method exists to take the shear force into account. With the help of a static finite element analysis a test rig set-up is developed to investigate shock absorber friction replicating the suspension mounting situation. In the first step, a full suspension is transferred to a finite element model by a reverse engineering approach. Special attention is given to the spring forces, which show to be strongly multiaxial in terms of shear force reduction. Subsequently, the stress characteristics of the shock absorber tube, piston and the inner housing of the twin-tube shock absorber are investigated. Regarding various possible load cases for shock absorber testing under shear force, it becomes evident that one specific test set-up is able to reproduce the real load situation accurately. This test layout is implemented on a hydropulser test rig and allows the study of load-dependent friction characteristics.

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Section: Finite Element Analysis (Fea)mentioning

confidence: 99%

Shock absorber friction testing on a MacPherson suspension considering realistic mounting situation

Deubel

Vincenz

Prokop

2022

Journal of Vibration and Control

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“…The first invariant has different formulations for each stress state (equations (1) to (3)) and describes the elongation of a vector, which is determined by the eigenvalues of the deformation tensor. 14 Based on this formulation, the equivalent maximum stretch value for pure shear is λ ps = 1.93 and for the equibiaxial stress state λ eq = 1.55.…”

Section: Influence Of the Temperature And Stress State On The Mechanimentioning

confidence: 99%

Characterisation of the quasi-static material behaviour of thermoplastic elastomers (TPE) under consideration of temperature and stress state

Hopmann

Zimmermann

2019

Journal of Elastomers & Plastics

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This article deals with the determination of the mechanical material behaviour of injection-moulded thermoplastic elastomers (TPE). For this purpose, the mechanical behaviour of TPE is investigated on basis of different materials (type and hardness) and process parameters with regard to the process-induced anisotropy. Based on these investigations, an almost isotropic material was selected for the investigations about the influence of temperature, stress state and load level. The results confirm that the hardness of the material and type of the processed material have an impact on the mechanical properties longitudinal and transversal to the flow direction. Furthermore, TPE behave quite similar to pure elastomers, as they showed a non-linear material behaviour, a stress softening after initial loading and a residual deformation after unloading. All these effects also depend on the temperature, stress state and load level, which results in a complex material behaviour. At the end of the article, two calibration approaches of a hyperelastic material model were shown (one set of parameters for all stress states vs. one set of parameters for each stress state). The second approach (one set of parameters for each stress state) shows a much higher accuracy in approximation of the test results.

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“…Not only the fiber length, but also the fiber orientation is a criterion for an improvement of the mechanical behavior. The highest stiffness and strength are achieved only when a force is applied in fiber direction [8].…”

Section: Short Fiber-reinforced Plastics and Their Processingmentioning

confidence: 99%

Comparison of fiber‐reinforced recycled polyamide in single stage and two stage injection molding

Wellekötter

Bonten

2018

Polymer Composites

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Climate change and a growing energy demand drive the development of lightweight construction in the automotive industry. The recent focus of interest is on glass and carbon fiber‐reinforced plastics. A resulting increase of production waste and scrap parts requires an efficient recycling. Although thermoplastics are generally suitable for reprocessing, recycled polyamides like PA6 show differing mechanical properties in comparison to virgin material due to molecular degradation processes. To achieve a high recycling rate and to compensate for the reduced mechanical properties, the parts of the test series of this study are filled with glass fibers (20 and 30 wt%). To increase the mechanical properties even further, a single‐stage injection molding compounder is used. A comparison with the standard, two‐stage production process provides further understanding of the complex interactions. The study is carried out with various blends of recycled and virgin PA6 with a recycling rate of 0, 25, 50, and 75%. Both single and double recycled PA6 are used. For the evaluation of the mechanical properties, tensile tests, bending tests and impact bending tests are conducted and assessed by fibers length, fiber–matrix adhesion, and fiber content. The results of all tested recycling ratios show no direct influence of the recycling‐related impairment of the plastic on tensile strength, tensile modulus, bending strength, and impact resistance. Rather, the investigations indicate an expected direct relationship to the fiber content, whereby an increase in fiber content relates to a significant improvement of the mechanical properties. Furthermore, the investigated fiber length distributions show a correlation with the mechanical properties. Therefore, the more gentle material processing of the injection‐molding compounder and an associated reduction in fiber shortening, result in a superiority to the two‐stage production process. POLYM. COMPOS., 40:1731–1739, 2019. © 2018 Society of Plastics Engineers

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FEM zur Berechnung von Kunststoff- und Elastomerbauteilen

Cited by 20 publications

References 0 publications

Shock absorber friction testing on a MacPherson suspension considering realistic mounting situation

Shock absorber friction testing on a MacPherson suspension considering realistic mounting situation

Characterisation of the quasi-static material behaviour of thermoplastic elastomers (TPE) under consideration of temperature and stress state

Comparison of fiber‐reinforced recycled polyamide in single stage and two stage injection molding

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