Measuring sole pressure resistance

There are many ways to evaluate sole comfort and stress testing. One aspect of this is that there has been no in-depth study before, that is, the aging of shoes, especially the soles of shoes caused by repeated pressure. The impact of the heel on the ground and the weight of the wearer's body can have different stress effects on the heel. In the laboratory, these have never been completely copied. The French test agency CTC now has a special test that can fill this gap. During the test, they used their own developed machines to measure sports shoes (running shoes, hiking shoes, basketball shoes, etc.) as well as daily men's and women's shoes. The purpose of designing the machine is to replicate the pressure on the back of the sole, that is, the pressure caused by repeated impacts during walking or running. The results are expressed according to the type and condition of use (walking or running a certain length of distance, etc.) so that the results can be immediately applied to producers and consumers.
Test principle
A shoe with a hinged hinge is placed inside the shoe and a hammer is used to simulate the pressure generated by the walker or runner under the pressure of 200,000 cycles. At the end of the test, a degenerative value is obtained, representing how far the heel has degraded.
It is difficult to completely describe the movement of a person while walking or running. However, the principle of the test is to press the heel down with pressure, and the frequency of repetition varies depending on the process of the shoe test. Several biomechanical problems were involved in the test: 1. The pressure was applied to the talus from the outermost 35mm of the calcaneus (the bone at the heel) through the sacrum. The hammer falls exactly 35mm behind the shoe last. 2, pressure must be applied to the heel (foot hit the ground). A small metal piece was placed under each hammer and the shoes were tested on the tribe. 3. The walking and running signals used must really reproduce these behaviors. During walking, the CTC uses a maximum pressure of 700 N, a frequency of 1 Hz. During running, the maximum pressure increased to 3000N and the frequency increased to 2.6Hz. These values ​​correspond to biomechanical data obtained in reality.
Test Equipment
The machine is simple, with two hydraulic hammers, a separate hydraulic pump and a thermostat controlled air cooling system. There is a control panel control device on the front and a pressure sensor to measure. The software selects the number of cycles based on the soles being tested (walking shoes, running shoes, etc.) and the signal transmitted to the hammer. Two different shoes can be tested independently at the same time, as both pressure and frequency can be programmed separately for different hammers and shoes. The device can be applied to 37- to 43-yard shoes, and the shoes can be quickly and easily installed under the hammer so that the test can be easily duplicated and repeated.
The construction of the hammer is very special. When the shoes and cymbals fall, they will return to the starting point to ensure that each strike is the same. Its engagement with the shoe lasts exactly 35mm from the heel, so that the applied pressure is in line with the fact that the human foot is moving and the pressure generated by the sacrum is just 35mm from the talus. There is a gasket at the end of the hammer to prevent the shoes from sliding sideways. Deterioration values ​​are given after 200,000 cycles, and different values ​​are given depending on whether the machine is set for walking or running conditions: 1. The minimum value for walking pressure is 50N, the maximum is 700N, and the frequency is 1Hz (200,000 cycles It takes more than 55 hours.) 2. The minimum value of running pressure is 50N, the maximum is 3000N, and the frequency is 2.6Hz (200,000 cycles now takes only 21 hours more.)
result
The calculation of the degenerative value is based on the minimum material pressure of the heel during compression. This corresponds to the minimum material pressure at the end of the test and at the beginning of the test. The reference value is calculated from the 10th cycle attack, because the previous cycle is easy to mistake. The device provides a way to establish new standards for heel comfort and durability. Heel prematurely often means quality and aging problems. This factor also affects comfort because it has a great influence on the stability of the back of the shoe.

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