BS ISO 3341-2000 纺织玻璃纤维.纱线.断裂力和断裂伸长的测定

标准号：BS ISO 3341-2000
中文标准名称：纺织玻璃纤维.纱线.断裂力和断裂伸长的测定
英文标准名称：Textile glass - Yarns - Determination of breaking force and breaking elongation
标准类型：W04
发布日期：2000/6/15 12:00:00
实施日期：2000/6/15 12:00:00
中国标准分类号：W04
国际标准分类号：59.100.10
适用范围：1 This International Standard specifies a method for the determination of the tensile breaking force and elonga-tion at break of glass yarns taken from packages. 2 The method is applicable to various types of glass yarn (single, folded, cabled, strands, structures without twist, rovings, etc.). It is basically intended for single, folded and cabled glass yarns having a diameter of less than 2 mm, or a linear density lower than 2 000 tex, taken from packages. Heavier yarns may be also tested providing the test conditions are acceptable to all interested parties. 3 The method is not applicable to glass yarns which, in equilibrium with the standard atmosphere and under a pre-tension of 5 mN/tex, are elongated by more than 0,5 %. Such yarns can be tested using a lower pre-tension (for example 2,5 mN/tex or 1 mN/tex), acceptable to all interested parties. This would occur mainly when dealing with sta-ple-fibre yarns. NOTE 1 Though the determination may be run on beamed yarn or on yarns taken from fabrics, the results must be considered as indicative only. NOTE 2 This test method is primarily intended for material characterization and quality control. Fibre-to-fibre abrasion and other factors such as insufficiently uniform tension (catenary) will increase variability and generate low test values. This will conse-quently impede accurate correlation between performance of the yarns and end use applications. Extreme care should be taken in considering this method for specification purposes. NOTE 3 Though this International Standard provides the possibility of determining the elongation at break, this practice is not recommended, however. Indeed, a correct assessment of the elongation will only be obtained using an extensometer; it will not be obtained by measuring the distance traversed by the moving clamp. On the other hand, experience shows that the use of an ex-tensometer is quite delicate and often causes damage to the specimen.