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Investigation of Textiles Elastic Properties with a Pendulum Impact Device

Research and development

Authors:

  • Valatkienė Loreta
    Department of Clothing and Polymer Products Technology, Faculty of Design and Technologies, Kaunas University of Technology, Kaunas, Lithuania
  • Strazdiené Eugenija
    Department of Textile Technology, Faculty of Design and Technologies, Kaunas University of Technology, Kaunas, Lithuania
  • Issa Manal
    Ecole Nationale Supérieure, des Industries Textiles de Mulhouse, Université de Haute-Alsace, Mulhouse, France

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Abstract:

This investigation concerns the estimation of materials impact behaviour based on the registration of vibration during the pendulum process. In order to find optimal testing conditions, three types of materials: woven fabric, knitted material and polyethylene membrane were chosen and two bobs of different weight and radius (r1=13.5 mm, r2=30 mm) were applied. The initial angles á0 of the pendulum were: 1; 2; 3; 4 and 5 degrees. To describe the impact behavior of the materials, the impact values and rebound angles of each stroke were used and the elasticity properties of the materials were determined: rebound elasticity ĺr and dynamic elasticity ed, on the basis of the initial potential energy V0 of the pendulum and its energy after one full swing V1. A close relationship exists between rebound elasticity er, dynamic elasticity ed and initial angles á0 of the pendulum for all the test materials under different testing conditions. Percentage values of absorbed energy H1 of the test materials at the first moment of pendulum impact were calculated. It was established that linear regression analysis can be applied to establish dependencies between absorbed energy H1 of the material at the moment of first impact, as well as the pendulum’s potential energy V1 after a full swing period and the first rebound angle á1.

Tags: impact behaviour, vibration process, rebound elasticity, dynamic elasticity.

Published in issue no 2 (67) / 2008, pages 52–57.

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