Abstract
Metal polymer sandwich sheets consist of materials with drastically different mechanical properties. Due to this fact and because of high local gradients in the cutting zone during the blanking process, traditional process strategies and empirical knowledge are difficult to apply. A finite-element simulation of the shear cutting process is used to predict the necessary force and the geometry of the cutting surface. A fully-coupled ductile damage model is used for the description of the material behaviour. This model considers the influence of shear and compression-dominated stress states on the initiation of damage. Experimental tensile and compression test data is used for the identification of material parameters. The results of the blanking simulation are compared with experimental data. Furthermore, the evolution of the stress state is analysed to gain understanding of the underlying physics. Finally this model enables the prediction of core compression and other quantities such as the acting stresses and corresponding triaxilities, which provide valuable information for the development of analytical models.
Highlights
Sandwich sheets are excellently suited to fulfil conflictingComplementary numerical investigation is advised, as those studies can support existing theories and might give new insights, because experimental investigation cannot requirements for weight reduction and increasing bearing give any statement about stress states
Capacity, and as a consequence replace monolithic sheets information about strains is difficult to obtain due to the in some applications. Their structure consists of two thin metal sheets on the outside and a light and small deformation zone and high local gradients
Recalling that the maximum flow stress of low density Polyethylene (LDPE) is below 12 MPa under tensile loading, the strength of the interface is assumed to be superior to the core material
Summary
Sandwich sheets are excellently suited to fulfil conflictingComplementary numerical investigation is advised, as those studies can support existing theories and might give new insights, because experimental investigation cannot requirements for weight reduction and increasing bearing give any statement about stress states. Capacity, and as a consequence replace monolithic sheets information about strains is difficult to obtain due to the in some applications. Their structure consists of two thin metal sheets on the outside and a light and small deformation zone and high local gradients. For the sandwich methods may be used for analysis; yet up to now they are investigated in this paper, the thickness and compliance is not able to provide an adequate insight in surface quality, several times larger than the outer sheets. Due to the combination of materials with drastically different properties and high local gradients in the cutting zone or force requirements. A first experimental observation to determine the maximum force during blanking of sandwich panels is presented by Übelacker et during blanking process, traditional process strategies and al. [1]
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