A topological approach for the flow behaviourcharacterization in LCM processes

Abstract

In this work we propose a topological approach to explain the dynamical behaviour of a LCM flow. To this end we shall use a class of homotopy maps in order to characterize an idealized mould filling process. By means this benchmark model we can construct a functional that can be used to give the reference in an on-line control system. In our previous work, [1], is proposed the use of the artificial vision technique to sense the mould as a discretized mesh that can be simulated off-line and used as a benchmark model in real-time control systems. The resulting FEM simulation represents theoretical flow behaviour. In this sense, the ideal flow behaviour must be defined based on the optimal criterion. For instance in [2], [3], the flow front in each time instant is desirable to be vent-oriented for dry spot prevention. Whatever of these optimal laws can be defined as a homotopy map where the flow front is defined as a parametric curve that moves with the flow. In order to reduce the sampling rate control system, the homotopy map is defined in a Flow Pattern Configuration Space (FPCS). This tool permits to represent the mould filling in an alternative space representation developed with the optimal criterion [5][6][7]. Using this space, the homotopy map is defined as a mono-dimensional parametric function for whatever mould dimension. Some numerical examples are given at the end of the paper.

In-situ calibration experimental method for Infrared thermography applied to the heat transfer analysis for composite parts during manufacturing based on Resin Infusion technique

“…Mentioned capacities are obtained by combining the accuracy of zero-dimensional sensors and the bidimensional detection of infrared thermography, together. Fig 2 and Fig 3 show the setup for the manufacturing of a composite part which is a square shape 30x30 cm 2 plate by RI technique where the resin inlet is at the left side and the outlet at the right end side. The laboratory temperature is controlled at 22°C and humidity at 50%.…”

“…This technique uses vacuum pressure to drive the thermoset resin into a fibrous laminate. The fiber preform is laid dry into the mould and vacuum is applied before the uncured thermoset resin is introduced [2]. Fig 1 presents the steps of the Resin Infusion process from preforming to demoulding.…”

Development of the in situ forming of a liquid infused preform (ISFLIP) process : a new manufacturing technique for high performance fibre reinforced polymer (FRP) components

“…Therefore, large parts require different filling patterns to achieve reasonable 𝑡𝑡 𝑓𝑓𝑖𝑖𝑓𝑓𝑓𝑓 . In Figure 2.14.b, two more sophisticated approaches are shown: inlet channelling in a tree branch configuration [229][230][231], and sequential activation of inlet and venting channels [232,233]. The objective of both filling patterns is to reduce the effective filling length, 𝐿𝐿.…”