Permanent indentation characterization for low-velocity impact modelling using three-point bending test

Abstract : This paper deals with the origin of permanent indentation in composite laminates subjected to low-velocity impact. The three-point bending test is used to exhibit a non-closure of matrix crack which is assumed as a cause of permanent indentation. According to the observation at microscopic level, this non-closure of crack is produced by the blocking of debris inside matrix cracking and the formation of cusps where mixed-mode delamination occurs. A simple physicallybased law of permanent indentation, ‘‘pseudo-plasticity’’, is proposed. This law is qualitatively tested by three-point bending finite element model and is lastly applied in low-velocity impact finite element model in order to predict the permanent indentation. A comparison between low-velocity impact experiments and simulations is presented.
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Natthawat Hongkarnjanakul, Samuel Rivallant, Christophe Bouvet, Arturo Miranda. Permanent indentation characterization for low-velocity impact modelling using three-point bending test. Journal of Composite Materials, SAGE Publications, 2014, 48 (20), pp.2441-2454. ⟨10.1177/0021998313499197⟩. ⟨hal-01851599⟩

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