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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 3903.6-2005 Footwear - Determination Resistance in whole. The following technical changes have been made with respect to GB/T 3903.6-2005 (the previous edition):
——The standard name was modified;
——The application scope was modified;
——The test principle description was modified;
——Chapter 3 "Terms and Definitions" was added;
——The types of test medium and test interface were added;
——Environment conditioning was added and test environment was modified;
——Dynamic slip test is added;
——The requirements for vertical load applied during test were modified;
——Description of test procedures was modified;
——Description of dry-type slip test procedures was added;
——Description of test result was modified;
——Annex A (normative) "Determination Method for Dry-type Friction Coefficient of Test Interface" is added.
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee 305 on Shoemaking of Standardization Administration of China (SAC/TC 305).
The previous edition of the standard replaced by this standard is as follows:
——GB/T 3903.6-2005.
Footwear - Test Methods for Whole Shoe - Slip Performance
1 Scope
This standard specifies the test methods for slip performance of whole shoe or sole.
This standard is applicable to whole shoe and sole.
This standard is not applicable to footwear with spike, metal nail or similar structures.
Note: the sole materials may be determined by reference to this standard.
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.
GB/T 6682-2008 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 19766-2005 Specification for Natural Marble for Building Slab
GB/T 20239-2006 Wooden Flooring for Gymnasium
GB/T 22049 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
static friction force
the mutual resistance to relative slip between two mutually contacted objects, when relative slip trend occurs between the contact surfaces but they are relatively static
3.2
static friction coefficient
the ratio of the force required to cause the separation of contact surfaces of two static objects in the tangential direction to the vertical force acting on the two surfaces
3.3
dynamic friction force
the slip resistance to the other object generated in contact surface when relative slip occurs between two contact objects
3.4
dynamic frictional coefficient
the ratio of the force required to maintain the uniform motion between contact surfaces to the vertical force acting on the two surfaces
3.5
vertical load
the force loaded on specimen in vertical direction, including the weight of footwear, shoe last, clamp and weight
4 Principle
Place the tested sample on test interface and apply specified force to relatively move the plane and specimen with horizontal or certain angle, then measure friction force and calculate friction coefficient. Friction coefficient is adopted to evaluate the slip performance of whole shoe or sole.
5 Test Equipment and Materials
5.1 Non-slip property tester
5.1.1 Specimen fixing device
It is used for fixing whole shoe and sole; specimen fixing device may be used to adjust the contact angle of sole test position and test interface and the adjustable angle shall not be less than 7°.
5.1.2 Power system
Power system may provide vertical pressure for composite specimen and make it move at constant speed in horizontal direction. The vertical pressure is adjustable within 100~600N and the horizontal sliding speed is adjustable within 0.1~0.5m/s.
5.1.3 Data acquisition and display device
Data acquisition and display device may measure and display the vertical load and friction force in real time during slipping process and see Figure 1 for the recorded test graph; the acquisition frequency of testing data shall be at least 30 data/s, at least 10 groups of testing data shall be uniformly read within 0.3~0.6s; the accuracy of vertical load and friction force is 1N and 0.1N respectively.
Keys:
x——Time (s);
y——Force value (N);
z——Displacement (m);
1——Testing section;
2——Specified pressure;
3——Friction force value;
4——Displacement of specimen;
5——Maximum static contact time;
A——Initial pressure: 50N;
B——Start testing, statically contact for 0.2s and reach the required specified pressure within 0.2s;
C-D——Testing section within 0.3~0.6s in slipping process.
Figure 1 Testing Graph
5.2 Test medium
5.2.1 Glycerinum water solution: with mass fraction of 85.3%~92.6% and viscosity of (0.2±0.1)Pa·s [(200±100)cP]. Since the glycerinum water solution has hygroscopicity in the air with relative humidity greater than 32%, the glycerinum water solution in test interface shall be replaced if the testing time is long.
5.2.2 Detergent solution: sodium lauryl sulfate water solution with mass fraction of (0.5±0.05)%.
5.2.3 Grade III water: it shall meet the requirements of GB/T 6682-2008.
5.3 Test interface
5.3.1 Glass interface: glass sheet with smooth surface.
5.3.2 Ceramic tile interface; dry-pressed ceramic tile with water absorption less than or equal to 0.5% and thickness of (10±1)mm; the dry-type friction coefficient of ceramic tile shall be within 0.57~0.63 determined according to the test method specified in Annex A.
Note: Category BIa ceramic tile specified in 4.3.1, GB/T 4100-2006 may be adopted.
5.3.3 Wooden flooring interface: solid maple composite flooring with thickness of (24±2)mm shall be adopted for the surface course, and the dry-type friction coefficient of wooden flooring determined according to the test method specified in Annex A shall be within 0.47~0.53. The physical and mechanical performances of wooden flooring shall meet those specified in Table 1 of GB/T 20239-2006 and the functional requirements shall meet the requirements of wooden flooring for gymnasium for competition use specified in Table 5 of GB/T 20239-2006.
5.3.4 Stone slab interface: marble stone slab with thickness of (10±1)mm shall be adopted, the water absorption and abrasion resistance shall meet those specified in Table 7 of GB/T 19766-2005, and the dry-type friction coefficient of stone slab determined according to the test method specified in Annex A shall be within 0.62~0.68.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
6 Specimen and Environment Conditioning
7 Test Method
8 Result Expression
9 Test Report
Annex A (Normative) Determination Method for Dry-type Friction Coefficient of Test Interface
Bibliography
