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Badania wpływu struktury napełniacza na parametry tworzywa w formie w procesie niskociśnieniowego formowania laminatów w oparciu o symulacje numeryczne

Frącz W., Janowski G., Ryzińska G.

Przetwórstwo Tworzyw

2017

T. 23, Nr 3 (177)

185--194

W pracy wykonano symulacje numeryczne procesu niskociśnieniowego przesycania napełniacza w zamkniętych formach (ang. RTM) dla dwóch rodzajów napełniacza: maty z włókna szklanego typu S o nazwie handlowej OCF M8610 oraz tkaniny z włókna szklanego typu E w gatunku Cofab A1118B przy zachowaniu jednakowych parametrów technologicznych. Właściwości włókien ustalono na podstawie przeglądu literatury. Właściwości samego napełniacza obliczono w programie Digimat FE. W celu obliczenia przepływu żywicy (żywica poliestrowa Arotran Q6055) wyznaczono porowatość oraz przepuszczalność napełniacza. Symulacje procesu RTM przeprowadzono w programie Autodesk Moldflow Insight 2013 dla modelu fotela pasażera pojazdu komunikacji miejskiej. Przeanalizowano m. in. temperaturę, ciśnienie oraz stopień utwardzenia żywicy w gnieździe formy w zależności od rodzaju napełniacza.

In this work the advanced numerical analyses of the RTM process for two types of reinforcement (OCF M8610 mat nade from fiberglass of S type and Cofab A1118B fabric made from glass fibers of E type) were performed. The analyses were made with the same type of polyester resin (Arotran Q6055 type) and at identical process parameters. The basic properties of fibers were determined on the basis of literature review. The properties of the reinforcement were determined on the basis of calculations by means of Digimat FE software. To calculate the resin flow the porosity and permeability of the reinforcement were determined. The RTM process simulations were performed by means of Autodesk Moldflow Insight 2013 commercial code for the passenger seat used in vehicle of public transport. The temperature, pressure and bulk conversion of the resin in the mold cavity depending on the type of reinforcement were taking into account.

Ultrasonic evaluation of the fibre content in glass/epoxy composites

Wróbel G., Pawlak S.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 18, nr 1-2

187--190

Purpose: The aim of the work was to find relationships between the selected parameter of an ultrasonic wave and the local fibre content in a glass/epoxy composite. Design/methodology/approach: The experiments have been performed in two distinct phases. During the first phase, typical glass/epoxy composite materials with different fibre content were examined by means of through-transmission and pulse-echo ultrasonics. In the second phase, the standard destructive method was applied to determine the actual glass content in investigated composite materials Findings: The experimental results showed relationships between ultrasonic wave velocity and the local fibre content in investigated composite materials. This study has also assessed the ability of pulse-echo technique to carry out such a testing. Research limitations/implications: Relationships found may be useful to local fibre content examination, but for each composite material different relationships are required to be determined, as was done in the present study. Practical implications: The described method can be applied to the post-production quality control of a finished composite product, but in the case of composites made of different components it is necessary to determine distinct relationships for each material. Originality/value: A new approach to the problem of fibre content examination has been demonstrated by means of pulse-echo technique. The method developed should be of interest to the industrial quality control procedures and has great importance for products with a high failure-free requirements.