Insole backpart longitudinal stiffness testing method

Abstract

The invention discloses an insole backpart longitudinal stiffness testing method. The insole backpart longitudinal stiffness testing method includes the following steps: performing a plurality of loading tests on a first testing position of an insole backpart sample, measuring arm of force and deflection of the first testing position of the insole backpart sample, calculating statistical deflection of the first testing position, performing a plurality of tests on different positions of the insole backpart sample, measuring arm of force and deflection of the different positions of the insole backpart sample, calculating statistical deflection, drawing a fitting straight line according to a corresponding relationship between the statistical deflection of each testing position and a cubic arm of force to acquire an equation and an gradient of the fitting straight line, and acquiring insole backpart longitudinal rigidity according to a relation equation between the gradient of the fitting straight line and the insole backpart longitudinal rigidity as well as an instrument stability coefficient. Differences of instrument stability coefficients caused by differences in structures and clamping performance of testing instruments in different types are taken into account, so that testing results have repeatability and reproducibility, and result deviation due to the fact that deflection errors related to the arm of force are taken into calculation during single-point tests is avoided.

Description

technical field [0001] The invention relates to a stiffness detection method, in particular to a detection method for the longitudinal stiffness of a shoe shank. Background technique [0002] At present, foreign standards for testing the longitudinal stiffness of steel shanks mainly include: British Standards: BS5131: Section4.18: 1985: British Standard Methods of test for footwear and footwear materials part4.Other components Section4.18Longitudinal stiffness of steel shanks; Standard: ISO18896:2006: Footwear-Test methods for shanks-Longitudinal stiffness. [0003] Domestic standards for testing the longitudinal stiffness of steel shanks mainly include: National Standard: "GB / T3903.34-2008 Test Method for Longitudinal Stiffness of Footwear Shabs" Industry Standard: "QB / T1813-2000 Test Method for Longitudinal Stiffness of Leather Shoe Shanks ". [0004] Among them, "GB / T3903.34-2008 Longitudinal stiffness of shoe shank test method" is equivalent to the international standa...

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Problems solved by technology

However, whether the result of longitudinal stiffness S is accurate depends on whether the statistical deflection a is accurate; whether the statistical deflection a is accurate depends on a in the formula 1 、a 2 、a 3 、a 4 Whether the measurement result of a is accurate; and a 1 、a 2 、a 3 、a 4 The accuracy of the measurement results is affected by many factors, including the reasons of the instrument itself, such as the sensitivity and accuracy of the dial indicator, the fixing method of the dial indicator, etc., as well as operational reasons, such as the probe of the dial indicator. The verticality of the installation, the tightness of the shank clamping, the balance and stability when adding weights, etc., and some of these factors are unavoidable, more or less will lead to a 1 、a 2 、a 3 、a 4 Errors in measurement results

Although the statistical deflection formula can be used to partially eliminate the errors caused by certain factors that are not affected by the load mass and moment arm, there are still some systematic errors related to load mass, moment arm and other factors, which are difficult to eliminate through the statistical deflection formula. However, it is included in the statistical deflection a and brought into the stiffness formula for calculation, so that the obtained stiffness S result deviates from the actual value

[0007] In addition, because instruments with different structures have different fixing and clamping capabilities for shanks and dial gauges, for a 1 、a 2 、a 3 、a 4 The measurement results will also cause different systematic errors. This part of the systematic error cannot be eliminated by the calculation of the statistical deflection formula. After being brought into the calculation of the stiffness formula, it will also cause obvious differences in the test results between instruments.

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