Study on the Residual Compressive Strength of a Composite Sandwich Panel with Foam Core after Low Velocity Impact

摘要

The residual compressive strength of a foam core sandwich panel after low-velocity impact was studied by using experimental and analytical methods.The test specimens were compressed uniaxially after they were subjected to a low-velocity-impact.From the observation in the test,one can conclude that the subsequent core crushing around the impact region is the major failure mode in the sandwich structure.A failure criterion named Damage Propagation Criterion was proposed to predict the residual compressive load bearing capability of the low-velocity impacted composite sandwich panel.The characteristic value used in this failure criterion can be calculated by an analytical model developed or by conducting the Sandwich Compression after Impact test.