Abstract
Layered metallic materials (LMMs) offer a better combination of different mechanical properties in comparison to monolithic sheets. Hot roll-bonding is an effective and economic processing approach for fabricating LMMs. Because of improved mechanical properties, LMMs can be used in shipbuilding, nuclear reactors, manufacturing of various chemical tanks and pressure vessels. Delamination of layered sheet is often a problem in industrial applications. Therefore, delamination initiation and propagation needs to be predicted. In this study, delamination behavior of Steel/Steel (St/St) bi-layered sheet, prepared using roll bonding technique at preheating temperature of 950 °C and thickness reduction of 47%, is studied using T-peel test. The fracture toughness and average peel strength are measured experimentally. By using the experimental fracture toughness, numerical simulation is performed using surface-based cohesive zone model (SCZM). Both bilinear and linear-exponential traction-separation laws are considered to study damage initiation and propagation behavior. It is observed that the exponential softening predicts damage evolution more accurately as compared to linear softening law.
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