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Title: Finite element analysis of footwear and ground interaction
Author: Sun, Zhigang
ISNI:       0000 0001 3491 0967
Awarding Body: University of Salford
Current Institution: University of Salford
Date of Award: 2005
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Good slip resistant tread patterns of outer-sole of military boots are vital to minimize the risk or severity of slip in combat and physical training situations. This study was aimed at how plastic failure of soil mass develops between the boot outer-sole with cleats and soft soil surfaces, in contrast with the problem between hard surfaces and outer-sole of boot which can be simply modelled using Coulomb-friction representation. The Drucker-Prager elastic-perfectly plastic material failure criterion is employed to simulate the behaviour of the soil material. A total of five three-dimensional solid soil Finite Element models interactive with the relatively rigid outer-sole of boots with different typical tread patterns have been constructed in the Preprocessor of the ANSYS finite element package. Vertical and transverse loading conditions were acted on the surfaces of soil models interactive with tread patterns. A series of non-linear, three-dimensional FE numerical model have been successfully produced in Solution of the ANSYS. The numerical modelling results were also validated by experiment. These results were analysed and a suitable model was identified to reduce the plastic failure in horizontal direction (X) or provide the best traction force effect. The comparison of numerical modelling results shows that the first tread patterns among the total five tread patterns designs displays the best traction force effect to resist slip in gaiting direction than the others. The experimental validation study proves the FE numerical modelling provided a good agreement with soil failure pattern and the maximum failure distances. The methodology created in this study can be used as one kind of standard method to judge how performance is for a particular tread patterns design mainly on aspect of traction force provision as well as lateral slip prevention.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available