Wyniki wyszukiwania - BazTech

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Experimental and Numerical Analysis of the Tendon Repair Process Using Tubular Braided Fabrics

Ochola J., Malengier B., Daelemans L., Githaiga J., Van Langenhove L.

Autex Research Journal

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2018

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Vol. 18, no. 2

121--129

EN

This paper presents the experimental and numerical analysis of the potential of a braided fabric for flexor tendon repair. Numerical models of tubular braided fabrics were generated using a python script interface and imported into ABAQUS® while Flexor tendon models were represented as silicone rubber rods. Experimental tests and Finite Element Modelling (FEM) of the flexor tendon repair was undertaken by deploying two tendon ends from opposite sides of a tubular braided fabric. This was done such that the tendon ends meet at the midpoint within the fabric. The tendons were tightly held to emulate a realistic repaired tendon. A displacement driven uniaxial loading was induced on the tendon-fabric assembly sufficient to cause a 2mm gap between the tendon ends. Numerical analysis of the repair potential of a braided fabric in tendon repair was done by analyzing selected fabric parameters that were crucial in tendon repair applications. The results show that changing the parameters of the braided fabrics significantly affected the potential of the fabrics during tendon repair.

2

Technology and Properties of Distance Five-layered Double-Weft-Knitted Fabrics with Elastomeric Threads

Włodarczyk B., Kowalski K.

Fibres & Textiles in Eastern Europe

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2014

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Vol. 22, no. 1 (103)

68--73

EN

This paper presents the concept of forming distance weft-knitted fabrics with five knitted layers in their structure. The knitted fabrics developed have a relatively large thickness in relation to the needle pitch and distance between the needle beds of the knitting machine on which they were formed. The effect described was obtained by combining three knitted layers with the use of different reports and the number of monofilament threads knitted-in, and by modifying the knitted layers with elastomer threads. The distance knitted fabrics designed and produced for potential use as preforms for composites and parts protecting against an impact were tested and analysed with respect to their structural parameters.

PL

W pracy przedstawiono koncepcję wytwarzania rządkowych dzianin dystansowych zawierających w swej strukturze trzy warstwy dziane. Opracowane dzianiny charakteryzują się stosunkowo dużą grubością w relacji do podziałki uiglenia i odległości między łożami szydełkarki na której zostały wytworzone. Opisywany efekt uzyskano przez łączenie trzech warstw dzianych różnym raportem i liczbą wrabianych nitek monofilamentowych oraz poprzez modyfikację warstw dzianych nitkami elastomerowymi. Zaprojektowane i wykonane dzianiny dystansowe o potencjalnym przeznaczeniu na preformy do kompozytów i elementy ochronne przed uderzeniem, poddano badaniom i analizie parametrów strukturalnych.

3

Modification of External Layers of Distance Knitted Fabrics with Elastomeric Threads and Its Effect on the Structural Parameters

Kowalski K., Włodarczyk B.

Fibres & Textiles in Eastern Europe

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2012

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Vol. 20, no. 4 (93)

62--66

EN

The article presents the concept of producing distance weft-knitted fabrics of relatively high thickness in regard to the needle pitch and distance between the beds of a flat knitting machine. Such construction was obtained by linking external layers of the knitted fabric with different reports and a number of knitted-in monofilament threads, and also by the modification of external layers using elastomeric threads. Distance knitted fabrics designed for the potential use as preforms for composites and elements protecting against the impact were analised with regard to the structural parameters.

PL

W pracy przedstawiono koncepcję wytwarzania rządkowych dzianin dystansowych o stosunkowo dużej grubości w relacji do podziałki uiglenia i odległości między łożami szydełkarki płaskiej. Efekt ten uzyskano przez łączenie warstw zewnętrznych dzianiny różnym raportem i liczbą wrabianych nitek monofilamentowych oraz modyfikacją warstw zewnętrznych dzianiny nitkami elastomerowymi. Zaprojektowane i wykonane dzianiny dystansowe o potencjalnym przeznaczeniu na preformy do kompozytów i elementy ochronne przed uderzeniem, poddano badaniom i analizie parametrów strukturalnych.

4

The application of Zurek’s rheological model for description of mechanical behaviour of textiles subjected to different state of loads

Żurek W., Chrzanowski M., Sybilska W., Jałmużna I.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 43, nr 2

702--710

EN

Purpose: In order to describe the rheological properties of textile products there have been used various models but none of them delivers the complementary solution for textiles subjected to different fields of loads. Therefore the idea presented by Hasley in 1945 was an inspiration for us to propose the new rheological model based on theory of plastic-elastic solids. Design/methodology/approach: It was assumed that the modified rheological model would consist of two parallel parts: I - Hooke’s spring with rigidity C1 and II - Hooke’s spring with rigidity C2, connected in series with a frictional element with a constant resistance, T and additional force Kε22, and a piston with a weight m displacing in a liquid with a viscosity η, where ε22 is a shift of the piston from its initial position. Findings: The proposed model represents adequately stress – strain relationships of polypropylene monofilaments subjected to tensile test. The results indicate that for each investigated type of nonwovens there is no significant difference between the shape of the theoretical and experimental elastic recovery curve during the recovery test. Research limitations/implications: The application of presented model was used for illustration of the description of relaxation of polypropylene monofilament subjected to tensile load and rheological properties of non-woven fabrics made also from polypropylene fibres subjected to the compression loads. Originality/value: The new rheological model was proposed. It can be universal for description of mechanical behaviour of textiles subjected to the tension or compression loads.

5

New Rheological Model for Analysis of Load/Strain/Time Relationships of Monofilaments

Żurek W., Krucińska I., Konecki W., Chrzanowski J., Jakubczyk Z.

Fibres & Textiles in Eastern Europe

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2002

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Vol. 8, no. 2 (37)

23--26

EN

A modified rheological model is presented for interpretation of the phenomena occurring in PET or PP monofilaments during extension. The proposed model includes a hampering unit (de Saint-Venant), as in the Bingham model, and additionally an inertial element. The shapes of curves calculated on the base of the derived mathematical model were compared with the experimental ones. The analysis of the correlation coefficient values indicated that the theoretical equations describing the shapes of load-strain curves very well approximated the experimental curves determined for each sample investigated.

PL

Przedstawiono zmodyfikowany model reologiczny dla interpretacji zjawisk, zachodzących we włóknach z PET i PP podczas wydłużania. Zaproponowany model zawiera człon hamujący de Saint-Venanta, tak jak w modelu Binghama i dodatkowo człon inercyjny. Kształt krzywych otrzymany na podstawie opracowanego modelu matematycznego porównano z kształtem krzywych doświadczalnych. Analiza otrzymanych wartości współczynników korelacji wykazuje, że teoretyczne równania, opisujące kształt krzywych: obciążenie w funkcji wydłużenia, bardzo dobrze oddają przebieg krzywych doświadczalnych dla każdej z badanych próbek.