Predictive multiscale computational model of shoe-floor coefficient of friction.

Understanding the frictional interactions between the shoe and floor during walking is critical to prevention of slips and falls, particularly when contaminants are present. A multiscale finite element model of shoe-floor-contaminant friction was developed that takes into account the surface and material characteristics of the shoe and flooring in microscopic and macroscopic scales. The model calculates shoe-floor coefficient of friction (COF) in boundary lubrication regime where effects of adhesion friction and hydrodynamic pressures are negligible. The validity of model outputs was assessed by comparing model predictions to the experimental results from mechanical COF testing. The multiscale model estimates were linearly related to the experimental results (p < 0.0001). The model predicted 73% of variability in experimentally-measured shoe-floor-contaminant COF. The results demonstrate the potential of multiscale finite element modeling in aiding slip-resistant shoe and flooring design and reducing slip and fall injuries.

[1]  G. Heinrich,et al.  Rubber Friction on Self-Affine Road Tracks , 2000 .

[2]  M. Lovell,et al.  Analysis of the Contribution of Adhesion and Hysteresis to Shoe–Floor Lubricated Friction in the Boundary Lubrication Regime , 2012, Tribology Letters.

[3]  T. Jacobs,et al.  A Technique for the Experimental Determination of the Length and Strength of Adhesive Interactions Between Effectively Rigid Materials , 2015, Tribology Letters.

[4]  Mark G Blanchette,et al.  The influence of footwear tread groove parameters on available friction. , 2015, Applied ergonomics.

[5]  A. McIntosh,et al.  Slip Resistance of Casual Footwear: Implications for Falls in Older Adults , 2001, Gerontology.

[6]  Raoul Grönqvist,et al.  Mechanisms of friction and assessment of slip resistance of new and used footwear soles on contaminated floors. , 1995, Ergonomics.

[7]  Wen-Ruey Chang.  The effect of surface roughness on dynamic friction between neolite and quarry tile , 1998 .

[8]  Gert Heinrich,et al.  Hysteresis Friction of Sliding Rubbers on Rough and Fractal Surfaces , 1997 .

[9]  Mark S. Redfern,et al.  Modeling Mixed-Lubrication of a Shoe-Floor Interface Applied to a Pin-on-Disk Apparatus , 2009 .

[10]  Kurt E. Beschorner,et al.  Required coefficient of friction during level walking is predictive of slipping. , 2016, Gait & posture.

[11]  Kurt E. Beschorner,et al.  Fluid pressures at the shoe-floor-contaminant interface during slips: effects of tread and implications on slip severity. , 2014, Journal of biomechanics.

[12]  A. Furno,et al.  On the dependency of rubber friction on the normal force or load: theory and experiment , 2015, 1512.01359.

[13]  Christopher M. Powers,et al.  Slip Prediction Accuracy and Bias of the SATRA STM 603 Whole Shoe Tester , 2015 .

[14]  Kurt E. Beschorner.  Development of a Computational Model for Shoe-Floor-Contaminant Friction , 2008 .

[15]  W R Chang,et al.  The role of surface roughness in the measurement of slipperiness , 2001, Ergonomics.

[16]  Yi-Ju Tsai,et al.  The Influence of Footwear Sole Hardness on Slip Initiation in Young Adults * , 2008, Journal of forensic sciences.

[17]  Mark S. Redfern,et al.  A Microscopic Finite Element Model of Shoe–Floor Hysteresis and Adhesion Friction , 2015, Tribology Letters.

[18]  J. Burnfield,et al.  Prediction of slips: an evaluation of utilized coefficient of friction and available slip resistance , 2006, Ergonomics.

[19]  W R Chang,et al.  The role of friction in the measurement of slipperiness, Part 2: Survey of friction measurement devices , 2001, Ergonomics.

[20]  B. Persson.  Theory of rubber friction and contact mechanics , 2001 .

[21]  Pradeep L. Menezes,et al.  Contributions of adhesion and hysteresis to coefficient of friction between shoe and floor surfaces: effects of floor roughness and sliding speed , 2015 .

[22]  A. W. Mix,et al.  Standardized Polymer Durometry , 2011 .

[23]  S. Gorb,et al.  Hexagonal Surface Micropattern for Dry and Wet Friction , 2009 .

[24]  Staffan Jacobson,et al.  Influence of surface texture on boundary lubricated sliding contacts , 2003 .

[25]  P. Wriggers,et al.  Multi-scale Approach for Frictional Contact of Elastomers on Rough Rigid Surfaces , 2009 .

[26]  Bugao Xu,et al.  Evaluation of a rotary laser body scanner for body volume and fat assessment. , 2010, Journal of testing and evaluation.

[27]  M S Redfern,et al.  Predicting slips and falls considering required and available friction. , 1999, Ergonomics.

[28]  C. Florence,et al.  Estimated Lifetime Medical and Work-Loss Costs of Fatal Injuries--United States, 2013. , 2015, MMWR. Morbidity and mortality weekly report.

[29]  Staffan Jacobson,et al.  Friction and Wear Properties of Micro Textured DLC Coated Surfaces in Boundary Lubricated Sliding , 2004 .

[30]  Kai Way Li,et al.  The effect of shoe soling tread groove width on the coefficient of friction with different sole materials, floors, and contaminants. , 2004, Applied ergonomics.

[31]  Mikko Hirvonen,et al.  Development and validation of a novel portable slip simulator. , 2005, Applied ergonomics.

[32]  M. Lovell,et al.  Analysis of Shoe Friction During Sliding Against Floor Material: Role of Fluid Contaminant , 2012 .

[33]  Brian E. Moyer,et al.  Gait parameters as predictors of slip severity in younger and older adults , 2006, Ergonomics.

[34]  Wen-Ruey Chang,et al.  The Effect of Transverse Shear Force on the Required Coefficient of Friction for Level Walking , 2011, Hum. Factors.

[35]  B. Persson,et al.  Sliding Friction: Physical Principles and Applications , 1997 .

[36]  W R Chang,et al.  The slip resistance of common footwear materials measured with two slipmeters. , 2001, Applied ergonomics.

[37]  P. Wriggers,et al.  Multiscale FEM approach for hysteresis friction of rubber on rough surfaces , 2015 .

[38]  W. Kukull,et al.  Biomechanical Properties of Shoes and Risk of Falls in Older Adults , 2004, Journal of the American Geriatrics Society.

[39]  Gurjeet Singh,et al.  A Method for Measuring Fluid Pressures in the Shoe–Floor–Fluid Interface: Application to Shoe Tread Evaluation , 2014, IIE transactions on occupational ergonomics and human factors.

[40]  Kurt E. Beschorner,et al.  Effects of slip testing parameters on measured coefficient of friction. , 2007, Applied ergonomics.

[41]  D. P. Manning,et al.  Occupational slip, trip, and fall-related injuries can the contribution of slipperiness be isolated? , 2001, Ergonomics.

[42]  Wen-Ruey Chang,et al.  The effect of surface waviness on friction between Neolite and quarry tiles , 2004, Ergonomics.

[43]  Kai Way Li,et al.  The effect of shoe sole tread groove depth on the friction coefficient with different tread groove widths, floors and contaminants. , 2006, Applied ergonomics.

[44]  I. Hutchings.  Tribology: Friction and Wear of Engineering Materials , 1992 .