Background <p>De-bonding is a commonly observed failure&#xa0;in adhesively bonded system under impact loading. Therefore, it is important to understand such failures for properly designing and evaluating the integrity of these systems.</p> Objective <p>An Impact Loaded Blister Test (ILBT) is proposed to investigate de-bonding under impact loading and to obtain the de-bond initiation toughness. Further the Cohesive Zone (CZ) parameters for de-bonding are also determined.</p> Methods <p>An adhesively bonded steel-Poly Metha Methyl Acrylate (PMMA) system was used for tests. A polycarbonate (PC) loading bar, impacted by another PC bar, was used to load the PMMA layer and initiate growth of an existing de-bond. From the strain history measured at mid-length of the loading bar, the load and load-point displacement histories were calculated. The critical energy release rate at the instant the de-bond starts to grow was calculated through an axisymmetric analysis. Finite element analysis (FEA) with CZ was carried out and the remaining parameters of CZ were obtained by inverse approach.</p> Results <p>High-speed imaging of the de-bonding processes indicated a circular de-bond growing radially outward. Load-point displacement rate as high as 3.5 m/s was achieved. De-bond growth rate of 115 m/s and de-bond area growth rate of 8 m²/s were achieved. CZ parameters obtained through inverse approach were able to accurately&#xa0;predict the&#xa0;debonding observed in experiment.</p> Conclusion <p>The ILBT is demonstrated for isotropic material as a promising technique for determining the de-bond toughness and the CZ parameters of adhesively bonded systems under displacement rate comparable to that encountered in impact like situations.</p>