Characterisation of mechanical properties of thin polymer films using a bi-axial tension based on blow-up test

Authors: Tang, Zheng-xue; Ye, Lin

Source: Plastics, Rubber and Composites, Volume 32, Number 10, December 2003 , pp. 459-465(7)

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Abstract:

Blow-up tests were carried out to evaluate mechanical properties of the thin Nylon film used as bagging films. A new method for calculating bi-axial stress and strain of the thin film in blow-up tests was developed based on the theory of membrane with large strain solutions. The bi-axial tensile elastic modulus, Poisson's ratio, yield strength, fracture stress and bi-axial stress–strain relationship of the thin Nylon film were obtained. Meanwhile, uni-axial tensile tests were conducted and the results were compared with those from blow-up tests. For the Richmond HS-8171 thin Nylon film studied, the bi-axial tensile elastic modulus was slightly more than 2 times greater than the uni-axial tensile elastic modulus. The yield strength was the same for both bi-axial and uni-axial tension. The bi-axial fracture stress was about one-third greater than the uni-axial one, while the bi-axial failure strain was about two-thirds greater than the uni-axial counterpart.

Keywords: BI-AXIAL TENSILE TENSION; POLYMER FILM; STRESS&NDASH; BLOW-UP TEST; STRAIN RELATIONSHIP; THIN; MECHANICAL PROPERTIES

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/146580103225004379

Publication date: 2003-12-01

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