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Comparing Two Damage Models Under Shear Stress

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Abstract

Recently, a new macro-mechanical model for ductile damage was presented by Wierzbicki, Xue et al., trying to address the role assumed by Lode angle and pressure sensitivity. The new model requires several experimental tests to identify all its parameters, but should outperform the “standard” formulations at high triaxiality levels. In this work a comparison between the Lemaitre’s Continuous Damage Mechanics model and the Wierzbicki’s one is proposed. After calibration of both models, the displacement field measured using the Digital Image Correlation technique in a large shear test case is compared with results of Finite Element simulations obtained using the two damage models considered. Results are not conclusive but show that the new damage model is quite accurateas rupture criterion, but damage evolution history deviates to some extent from the experimentally observed behavior.

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Notes

  1. Note that the authors of the damage model also propose a second formulation using directly the Lode angle that is not used in this work.

  2. Low cycle fatigue data was extracted from material data sheet, i.e. 281 and 264 MPa respectively at 3,000 and 5,000 cycles.

  3. Note that the same location is predicted even when \(\beta =2\).

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Authors and Affiliations

  1. Dipartimento di Ingegneria Meccanica, Università di Cagliari, Piazza d’Armi, 09123, Cagliari, Italy

    A. Baldi, L. Francesconi, A. Medda & F. Bertolino

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  1. A. Baldi
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  2. L. Francesconi
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  3. A. Medda
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  4. F. Bertolino
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Correspondence to A. Baldi.

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Baldi, A., Francesconi, L., Medda, A. et al. Comparing Two Damage Models Under Shear Stress. Exp Mech 53, 1105–1116 (2013). https://doi.org/10.1007/s11340-013-9715-8

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