چكيده به لاتين
Nowadays, the use of sheet metal sheets is a proper solution for manufacturing products with different applications due to improved ductility, increased corrosion resistance, thermal distribution proportional to thermal transfer coefficients in each layer, reduce the weight and cost of components. To this end, the study of forming of two-layer metallic sheets plays an essential role in the design of sheet processesing. One of the most complex and difficult forming processes in terms of controlling effective parameters is the deep drawing procedure. The most common pitfall in the metallic sheets forming process are wrinkling, tearing and earring. The onset and growth of wrinkling are influenced by many factors, including mechanical and material properties, component geometry, boundary conditions, and stresses. This study makes a major contribution to research on wrinkling by demonstrating the plastic behavior of plates in the energy method form, and the plastic wrinkling of two-layer circular sheets has been calculated throughout two case studies. In each case, the fundamental theory of the wrinkling limit diagram model is discussed in the analytical method section with sufficient details. Additionally, several 3D finite element models, mainly for limit analysis, are simulated due to recognizing unforeseen incidents that may happen during the experimental procedure. Plus, the effects of different parameters such as initial circular blank diameter, the material of layers, lay-up effects on forming loads and the optimum blank holder force are investigated on the wrinkling behavior in FE simulation. Eventually, experimental tests have been designed and conducted to evaluate the theoretical and FE results.
