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Fig. 4


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Global response of the cyclic compression test carried out on the bolt head: evolution of penetration u(t)–u(t 0) with respect to the number of cycles when F(t) varies from 0 to 360 N and back following a triangular signal for a maximum load F max = 300 N (left) and F max = 600 N (right). The upper (cyan) curve corresponds to the maximum penetration when the maximum load is applied, while the lower (red) curve corresponds to the residual permanent penetration δr when no more force is applied.

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