Effects of the Distributions of Polypropylene Fibre Properties on the Tensile Response of Fibre Assemblies
| Title |
Effects of the Distributions of Polypropylene Fibre Properties on the Tensile Response of Fibre Assemblies |
| Publication year |
1995 |
| General note |
doi:10.1016/0032-3861(95)93920-H |
| Language |
English |
| Author |
Andreassen, Erik |
| Co-Authors |
Grøstad, Kristin - Hinrichsen, Einar L. - Braathen, Marianne Dale - Myhre, Ole Jan (Norner) |
| Source |
Polymer, 36 (6), 1995, 1189-1198 |
| Abstract |
The tensile response of some simple fibre assemblies is calculated, using the actual stress-strain relationships of constituent fibres. These stress-strain relationships are obtained by a scaling procedure, with distributions of ultimate tensile properties and an average stress-strain curve as input. Two polypropylene fibres with different polydispersity index, but the same weight-average molecular weight and draw ratio, are considered in this article. The fibre with the narrowest molecular weight distribution (MWD) has about 30% higher average strength. On the other hand, if bundles with a large number of fibres are compared, the strength of a bundle consisting of fibres with narrow MWD is less than 10% higher. The maximum strength of a random planar distribution of fibres is 36% and 44% of the average fibre strength, for fibres with narrow and broad MWD, respectively. The strength of a chain-of-bundles decreases as the number of bundles increases, and as the number of fibres in each bundle decreases. When the number of bundles is large, the strength of a chain-of-bundles containing fibres with broad MWD exceeds that of a chain containing fibres with narrow MWD. The assemblies considered in this article illustrate effects in real assemblies, such as nonwoven fabrics. They also provide references for the tensile properties of real assemblies. |