This part of GB/T 3903 specifies a test method for assessing the longitudinal stiffness of the steel shanks used for the reinforcement of the waist region of footwear.
This part is applicable to all kinds of shanks used for footwear.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 18454 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
longitudinal stiffness
the deflection of the shank measured under specified conditions when loaded with a specified force
4 Apparatus and material
The following apparatus and material shall be used:
4.1 Test machines for the determination of the longitudinal stiffness of shanks include:
a) a heel end clamp, capable of clamping a fluted shank securely without crushing the flute with the clamped dimensions being 32mm±1mm. The angle of the clamp shall be capable of adjustment to ensure that the portion of shank to which a force is applied lies horizontal;
b) a means of applying a downward force to the forward end of the shank, of 2N, 4N, 6N and 8N with a tolerance of ±5%;
c) a means of measuring the vertical deflection of the shank at the point where the force is applied, with an accuracy of ±0.025mm.
4.2 Stopwatch, with an accuracy of ±0.1s.
4.3 Calipers and/or a stainless steel ruler, with an accuracy of ±0.5mm.
GB/T 3903.34-2019 The following standards are cited：
GB/T 3903.34-2019 Cited by the following standards：
