The present paper presents an investigation and analysis study of the effect of the head shapes of the impactor on the damages observed during low-velocity impact on T700/Epoxy composite laminate. Two types of impactors were investigated: hemispherical and flat-face. A new criterion based on the LARC05 damage model was linked as a LARC_VUMAT subroutine to simulate the impact and explore the effects of the head form shape through a three-dimensional finite element model. To properly analyze the problem, the history time of the mechanical responses, such as impact forces, bending, principal, and residual stresses, are highlighted and assessed. Additionally, a comparison with the experimental data found in the literature was performed to check the validity and accuracy of the considered finite element model. The damage occurring in the T700/Epoxy plates is illustrated for each impactor head shape. The mechanical response curves and all kinds of damage of the presented simulations are in perfect agreement with the experiments. The proposed VUMAT is efficient in the prediction of fiber kinking, matrix cracking, fiber splitting, and fiber tension of a laminate, and more importantly, it is easy to implement for other types of materials and the reproducibility of the analysis is assured.
Quite recently, considerable attention has been paid to the phenomena of impact. To enrich and give more light on the phenomena, this work is presented to give a comprehensive account of the effect of contact force due to an impact on composite plate subjected to an hygrothermal conditions specially those made of Glass/Polyester.A comparative study between an experimental data obtained by [1] from impact tests to those obtained bysimulations was firstly conducted. Based on the obtained results, it can be concluded that model reproduce very successfully the experimental studies.The obtained numerical forces will be then used in Modde V 5.0 software to establish an DOE plan ‘design of experiments’. Two factors are taken into consideration: the absorbed mass of water by the material and the drop height of the projectile and their effects on the numerical contact force.From the results it has been carried out that the numerical contact force is reduced for aged plates. The mostinfluencing parameter is the drop height of the projectile. An important implication of these findings is that a mathematical model is established which governs the contact force in the domain studied.
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