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following presents a testing protocol and experimental data of uniaxial extension,
unconfined and confined compression of ACTEVA-52, a proprietary form of ethylene vinyl
acetate (EVA) foam used in the construction of New Balance running shoes. Confined
compression is proposed as a simple test method closely resembling hydrostatic loading.
The experimental data generated are used ... read moreto determine the bulk modulus of the material.
Next, using uniaxial extension data, we determine the shear modulus of the material. The
value of these parameters is used in a hyperelastic material model to numerically fit
the experimental data. The Ogden model is shown to most closely match the
stress-deformation response of the foam. The bulk modulus of the material is reported as
0.3 MPa, the shear modulus as 1.15 MPa. Experimental data show an increase in volume at
low axial stretches in tension. For increasing stretch the change in volume becomes
negative and the material contracts.
(M.S.)--Tufts University, 2011.
Submitted to the
Dept. of Mechanical Engineering.
Committee: Anil Saigal, and Mark
Keywords: Mechanical engineering, and