Virtual Reality visualization for short fibre orientation analysis

2014 ◽  
Author(s):  
Emiliano Pastorelli ◽  
Heiko Herrmann
Keyword(s):  
Virtual Reality ◽  
Fibre Orientation ◽  
Short Fibre ◽  
Orientation Analysis

scholarly journals Evaluation and consideration of local specimen material properties in lifetime prediction of short fibre reinforced PA6T/6I

2021 ◽  
Author(s):  
Gabriel Stadler ◽  
Andreas Primetzhofer ◽  
Gerald Pinter ◽  
Florian Grün
Keyword(s):  
Fibre Orientation ◽  
Failure Criteria ◽  
Reference Points ◽  
Short Fibre ◽  
Specimen Extraction ◽  
Specific Component ◽  
Specimen Material ◽  
Orientation Distributions ◽  
Novel Method ◽  
Component Service Life

To exploit the full material potential of short fibre reinforced PA6T/6I, specific component calculations including aniso- tropic material behaviour is necessary. For this, different failure criteria and fatigue models are used to describe the behaviour during a component service life. This paper deals with the determination and consideration of fibre orientations for failure criteria and fatigue calculations. Therefore, a novel method to determine fibre orientation (FO) distributions across injection moulded plates, is proposed. The developed method allows a forecast of FOs for different specimen extraction positions and angles on injection moulded plates by using only a few measured reference points. As a result, fatigue models can be calibrated with the strength values and the corresponding FO, calculated for fracture position. The performed tests show a non-negligible influence of failure positions, due to fibre orientation distributions along the specimens. So, the FO determination method delivers an improvement in strength values estimation.

Estimation of Fibre Orientation in Injection Moulding Plastics Parts

2017 ◽  
Vol 891 ◽  
pp. 55-59
Author(s):  
Maroš Martinkovič ◽  
Lukáš Likavčan
Keyword(s):  
Injection Moulding ◽  
Fibre Orientation ◽  
Short Fibre ◽  
Orientation Tensor ◽  
Thermoplastic Matrix ◽  
Polycrystalline Alloys ◽  
Degree Of Orientation ◽  
Reinforced Thermoplastics ◽  
Temperature Time

Fibre orientation in short fibre reinforced thermoplastics depends on injection moulding parameters. There are a lot of different parameters that must be established and controlled to achieve proper injection moulding of a plastic part. These parameters fall within four major areas: pressure, temperature, time, and distance. The aim of this article is estimation of fibre orientation in injection moulding plastics parts and comparison of these results with numerical simulated ones. Stereological metallography was used for estimation of experimental orientation of fibres. The orientation of simple fibre may be defined by the two angles θ and Φ. In a Short Fibre Reinforced Thermoplastic (SFRT) component there are frequently millions of fibres, therefore each individual fibre orientation specifying is very impractical. The fibres orientation in space can be described by the probability distribution function (PDF), Ψ(θ, Φ). Numerical modelling of fibre orientation was realised using MOLDEX3D software. Moldex3D is the CAE product for the plastics injection moulding industry. This software allows to view results of fibre orientation as an orientation of the X direction, Y direction, Z direction, the total orientation and orientation at surface. These first three orientations are relevant for the establishment of second-order orientation tensor. They belong to tensor ́s values a11, a22 and a33. Utilization of stereological metallography for short fibre orientation in plastic matrix is very similar to its utilization for estimation of grain boundaries orientation in polycrystalline alloys cased by plastic deformation. In the case of short glass fibres reinforced thermoplastics it’s structure consist of thermoplastic matrix and reinforcing fibres, which has some preferred orientation in most of cases – the structure is anisotropy. The way of scalar measurement of structure anisotropy is determination of degree of orientation. The anisotropic microstructure is decomposed into isotropic, planar or linear oriented components using stereology methods.

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