Detail of GB/T 3923.1-1997

Introduction of GB/T 3923.1-1997

1 Scope This standard specifies the method of using raveled strip and cut strip to determine the breaking force and elongation at breaking force of fabric s, including sample tests under balanced or moistened conditions of standard atmosphere for testing. This standard is applicable to woven fabrics and fabrics (such as knitted fabric, nonwovens, coated fabric and other types of fabrics) produced by other technology. This standard is not applicable to elastic fabric, weft plain knit fabric, rib knit fabric, geotextile, glass fabric, carbon fabric and polyolefine flat-yarn fabric. This standard requires using constant rate of extension (CRE) testing machine. Note: constant rate of traverse (CRT) testing machine may be used according to the agreement signed by parties concerned, but it shall indicate it in test report. 2 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this code are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. GB 6529—86 Textiles-Standard Atmospheres for Conditioning and Testing GB 8170—87 Rules for Rounding off of Numerical Values 3 Definitions This standard adopts the following definitions. 3.1 Strip test A kind of fabric tensile test, where the whole width of sample is clamped by a clamp 3.2 Cut strip A strip sample, which is cut to reach the required width for testing 3.3 Raveled strip A strip sample, both sides of which are removed with equal quantity of yarns to reach the required width for testing 3.4 Gauge length The distance between two effective clamping lines of clamping sample on test device 3.5 Initial length The distance between two effective clamping lines of clamping sample on test device under specified pretension 3.6 Pretension The force imposed on sample before testing 3.7 Breaking force/maximum force The recorded maximum breaking force of sample in tensile test under specified conditions 3.8 Force at rupture The recorded instantaneous ultimate force at rupture of sample in tensile test under specified conditions 3.9 Extension The increment of sample length induced by tension, expressed by length unit 3.10 Elongation The ratio between sample extension and its initial length, expressed by percentage 3.11 Elongation at break The elongation corresponding to breaking force 3.12 Elongation at rupture The elongation corresponding to force at rupture 3.13 Constant rate of extension (CRE) testing machine A kind of test instrument to make direct ratio between sample extension and time when one clamp of clamping sample is fixed and the other moves at constant rate throughout the testing 3.14 Constant rate of extension (CRT) testing machine A kind of test instrument, with one traverse clamp moving at constant rate and the other driving the clamp of hammer mechanism to impose loads. The increase rate of load or sample extension in test shall depend on the elongation characteristic of sample.

Contents of GB/T 3923.1-1997