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Resumd: On a ddveloppC un nouveau prockdk en vue de mesurer la rksistance d'initiation A la rupture dynamique pour des matdriaux fragiles sous sollicitations de rupture combinde du mode I et I. Les disques brdsilien B fissure centrale ont dtk fracturks sous sollicitations d'impact oblique en compression diamdtrale. Les

SUMMARYIn the present study, the shape optimization of a golf club head is investigated. The problem of maximizing the release velocity of the ball after impact is treated under the constraint of a speciÿed weight of club head. The thickness distribution of the clubface is chosen as the design variable for optimization. The basis vector method, which is an approximating method for optimization problems in which the sensitivity cannot be derived analytically, is employed. The basis vector represents a fundamental change of shape, and it is preferable to obtaining e ective results that the basis vectors be mutually independent. A simple approach to create the basis vectors using eigenmodes is also presented. The theory of impedance matching is conÿrmed numerically by a two-dimensional example. A three-dimensional example is given to show that this approach is e ective for optimal design of the golf club head.

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