tailieunhanh - Woven Fabric Engineering Part 3

Tham khảo tài liệu 'woven fabric engineering part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 3 Wing Tear Identification of Stages of Static Process Beata Witkowska1 and Iwona Frydrych2 1Textile Research Institute 2Technical University of Lodz Poland 1. Introduction In 1945 Krook and Fox Krook Fox 1945 analyzing photos of torn tongue shape samples distinguished and described the fabric tearing zone . the zone which appears between both thread systems of torn fabric sample. The fabric tearing zone is limited by two threads of stretched thread system arising from the cut strips of torn sample and the torn thread system being in the position just before the breakage . Krook s and Fox s research was an inspiration for the next researchers who were interested in the fabric tearing. They have very often based their considerations on Krook s and Fox s conclusions. The research was continued by Teixeira et al. in 1955 Teixeira et al. 1955 . They developed Krook s and Fox s Krook Fox 1945 observations and also formulated the theoretical equation which described the tearing phenomenon. In 1959 Taylor Taylor 1959 elaborated the mathematical relationship which on the basis of fabric and thread structure parameters enables to predict the tear strength. He analyzed the geometry of tearing zone in the aspect of friction forces of stretched thread system not torn along the threads of perpendicular system torn . Taylor didn t analyze the phenomena taking place in perpendicular torn threads. Research on the tearing process of trapezoidal samples was carried out by Hager Gagliardi and Steele Hager et al. 1947 . They as Taylor did not take into consideration the influence of the perpendicular thread torn system and occurring friction forces in the torn system. Moreover they assumed the linear relationship between the load and strain of stretched thread system. Hamkins and Backer Hamkins Backer 1980 presented their results concerning the tearing mechanics on the basis of two quite different in their structure fabrics made from a glass yarn of loose weave and a big .