Wednesday  |  Phipps  |  10:50 AM–11:10 AM

#13141, Experiments and Modeling of Viscoelastic Delamination Through a Transition in Validity of Small-scale-yielding

We present a set of interfacial strength data collected with asymmetric double-cantilever beam (ADCB) specimens consisting of aluminum adherends bonded with Epon 828/DEA epoxy. The ADCB specimens were tested over a range of quasistatic loading rates and temperatures between room temperature and just above the glass transition temperature of the epoxy adhesive. The results indicate a transition which we interpret as regimes where small-scale-yielding is either valid or invalid. In addition, we present efforts to predict the observed tends through finite element models which use a nonlinear viscoelastic material model to describe the epoxy behavior and cohesive surface elements to describe the interface separation.

Scott Grutzik   Sandia National Laboratories
Brandon Clarke   Sandia National Laboratories
Ryan Smith   Sandia National Laboratories
Chris Maiorana   Sandia National Laboratories
Todd Huber   Sandia National Laboratories
Earl Reedy   Sandia National Laboratories
Frank DelRio   Sandia National Laboratories