TY - JOUR
T1 - Heel-shoe interactions and the durability of EVA foam running-shoe midsoles
AU - Verdejo Marquez, Raquel
AU - Mills, Nigel
PY - 2004/9/1
Y1 - 2004/9/1
N2 - A finite element analysis (FEA) was made of the stress distribution in the heelpad and a running shoe midsole, using heelpad properties deduced from published force-deflection data, and measured foam properties. The heelpad has a lower initial shear modulus than the foam (100 vs. 1050 kPa), but a higher bulk modulus. The heelpad is more non-linear, with a higher Ogden strain energy function exponent than the foam (30 vs. 4). Measurements of plantar pressure distribution in running shoes confirmed the FEA. The peak plantar pressure increased on average by 100% after 500km run. Scanning electron microscopy shows that structural damage (wrinkling of faces and some holes) occurred in the foam after 750 km run. Fatigue of the foam reduces heelstrike cushioning, and is a possible cause of running injuries. (C) 2004 Elsevier Ltd. All rights reserved.
AB - A finite element analysis (FEA) was made of the stress distribution in the heelpad and a running shoe midsole, using heelpad properties deduced from published force-deflection data, and measured foam properties. The heelpad has a lower initial shear modulus than the foam (100 vs. 1050 kPa), but a higher bulk modulus. The heelpad is more non-linear, with a higher Ogden strain energy function exponent than the foam (30 vs. 4). Measurements of plantar pressure distribution in running shoes confirmed the FEA. The peak plantar pressure increased on average by 100% after 500km run. Scanning electron microscopy shows that structural damage (wrinkling of faces and some holes) occurred in the foam after 750 km run. Fatigue of the foam reduces heelstrike cushioning, and is a possible cause of running injuries. (C) 2004 Elsevier Ltd. All rights reserved.
UR - http://www.scopus.com/inward/record.url?scp=3242706886&partnerID=8YFLogxK
U2 - 10.1016/j.jbiomech.2003.12.022
DO - 10.1016/j.jbiomech.2003.12.022
M3 - Article
SN - 1873-2380
VL - 37
SP - 1379
EP - 1386
JO - Journal of Biomechanics
JF - Journal of Biomechanics
ER -