Changes in under-shoe traction and fluid drainage for progressively worn shoe tread

Area of Science:

• Biomechanics
• Occupational Safety
• Materials Science

Background:

• Shoe wear is a known factor contributing to increased slipping risk in occupational settings.
• Systematic studies on the relationship between progressive shoe wear and traction performance are limited.

Purpose of the Study:

• To investigate the impact of progressive shoe wear on the available coefficient of friction (ACOF).
• To analyze the effect of shoe wear on under-shoe fluid dynamics.
• To establish criteria for shoe replacement to mitigate slip hazards.

Main Methods:

• Five types of slip-resistant shoes underwent an accelerated abrasive wear protocol.
• The available coefficient of friction (ACOF) was measured during simulated slips on a glycerol-contaminated surface.
• Under-shoe fluid forces were quantified throughout the wear process.

Main Results:

• An initial increase in ACOF was observed with wear, followed by a subsequent decrease.
• Fluid forces initially low, increased as the worn area on the shoe sole expanded.
• Traction performance notably declined when the unworn heel region surpassed 800 mm².

Conclusions:

• Shoe wear significantly alters friction and fluid dynamics, impacting slip resistance.
• The size of the worn treadless region, particularly on the heel, is a critical indicator of reduced traction.
• Developing evidence-based shoe replacement guidelines based on wear extent can enhance occupational safety and reduce slip incidents.