GB/T 3903.21-2008 in English

《GB/T 3903.21-2008鞋类 粘扣带试验方法 反复开合前后的剪切强度》由TC305（全国制鞋标准化技术委员会）归口，主管部门为中国轻工业联合会。
GB/T 3903的本部分规定了测定粘扣带反复开合前后剪切强度的试验方法。本部分适用于各种鞋类粘扣带。

1 Scope

This part of GB/T 3903. specifies a test method for determining the shear strength of touch and close fasteners before and after repeated use.
This part is applicable to all footwear accessories.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 3903. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 16825.1-2002 Verification of Static Uniaxial Testing Machines — Part 1: Tension/Compression Testing Machines — Verification and Calibration of the Force-measuring System (ISO 7500-1:1999, IDT)
GB/T 22049 Footwear — Standard Atmospheres for Conditioning and Testing of Footwear and Components for Footwear (GB/T 22049-2008, ISO 18454:2001, IDT)
EN 12240 Touch and Close Fasteners — Determination of the Overall and Effective Widths of Tapes and the Effective Width of a Closure

3 Terms and Definitions

For the purposes of this part of GB/T 3903, the following terms and definitions apply.
3.1
Longitudinal shear strength
Maximum force per unit effective area required to separate the two tapes forming the specified closure in a shearing action under the specified conditions of test.
3.2
Effective width
Width of the pile at 90° to the length of the tape and which does not include the selvedge.
3.3
Effective area of a closure
Product of the effective width of a closure and the length of a closure.