On the anisotropic plastic behaviour of short fibre reinforced thermoplastics and its description by phenomenological material modelling

verfasst von: Felix Dillenberger

Verlag: Springer Fachmedien Wiesbaden

Buchreihe : Mechanik, Werkstoffe und Konstruktion im Bauwesen

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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Über dieses Buch

A requirement for the safe design of thermoplastic parts is the ability to precisely predict mechanical behaviour by ﬁnite element simulations. Typical examples include the engineering of relevant components in automotive applications. For this purpose adequate material models are essential. In this context, the present work introduces a material modelling approach for short fibre reinforced thermoplastics (SFRTPs). SFRTP parts are processed cost-effectively by injection moulding and show a varying degree of anisotropy due to the locally inhomogeneous ﬁbre distributions that arise during the moulding process. The presented material model considers linear-elastic behaviour and non-linear orthotropic stress-state dependent viscoplastic deformation for arbitrary fibre distributions. The constitutive equations are verified with the experiments of a PPGF30 material regarding different stress-states and orientations.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Motivation and Outline

Abstract

Plastic components increasingly substitute parts traditionally made of metallic materials in mechanical applications. This is due to an immanent lightweight potential and the possibility of tailoring physical properties to specific applications. Mechanical loading capabilities of plastic materials can be increased significantly by reinforcement fibres.

Felix Dillenberger

Chapter 2. Injection Moulded Short Fibre Reinforced Thermoplastics

Abstract

This work considers materials that can be distinguished as short fibre reinforced thermoplastics (SFRTPs), processed by injection moulding. They consist of a thermoplastic matrix material reinforced by chopped short glass fibres. The following sections give a general overview of these types of materials.

Felix Dillenberger

Chapter 3. Mechanical Basics

Abstract

The following sections give an overview of basic mechanical relations. These are needed for the evaluation of the experimental results in chapter 4 and the derivation of the material model in chapter 5. Section 3.1 gives a summary of strain related quantities.

Felix Dillenberger

Chapter 4. Material Characterisation

Abstract

Material testing was focussed on the characterisation of material parameters for the derivation of an adequate material model for FEA simulations. Next to the determination of material model input data, the test results were applied to the validation of simulation and homogenisation procedures. The overall experimental program consisted of mechanical tests as well as micro-structural analyses for the determination of FODs.

Felix Dillenberger

Chapter 5. Material Modelling

Abstract

Based on current approaches of existing material modelling techniques for SFRTPs given in section 2.6, a novel method will be proposed in the present chapter.

Felix Dillenberger

Chapter 6. Verification

Abstract

In the following, the verification of the constitutive equations determined in chapter 5 is performed. The parameters used for the material modelling of the characterised PPGF30 material are given. In the first section, the stiffness predictions of the model are checked against experimental results.

Felix Dillenberger

Chapter 7. Considerations for Engineering Practice

Abstract

In engineering practice, the product development process is mostly divided into consecutive design steps that require varying degrees of detail regarding the prediction of the mechanical behaviour of parts.

Felix Dillenberger

Chapter 8. Summary and Outlook

Abstract

The ability to precisely predict mechanical behaviour by FEA is a requirement for the safe design of thermoplastic parts. By proposing, in its essence, a novel material model for explicit finite element simulations of SFRTPs, this work contributes to the realisation of this requirement. The focus was set on the determination of permissible model simplifications based on experimental findings.

Felix Dillenberger

Backmatter

Titel: On the anisotropic plastic behaviour of short fibre reinforced thermoplastics and its description by phenomenological material modelling
verfasst von: Felix Dillenberger
Verlag: Springer Fachmedien Wiesbaden
Electronic ISBN: 978-3-658-28199-1
Print ISBN: 978-3-658-28198-4
DOI: https://doi.org/10.1007/978-3-658-28199-1