Shock-cushioning mechanics of shoe soles is studied theoretically using a simple walking model and the Maxwell model for a viscoelastic body.We propose a viscoelastic property of polyurethane suitable for shoe soles,which can realize both high shock cushioning and stability.For example,storage and loss moduli of polyurethane that can effectively reduce impact on a foot have been clarified and their preferable numerical region is presented.In addition,our newly developed polyurethane foams and commercially distributed current sole materials are mapped on a viscoelasticity space and their wear property as a shoe sole is discussed.
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