A SIMPLE CONSTANT STRAIN-ENERGY RELEASE RATE LOADING METHOD FOR DOUBLE CANTILEVER BEAM SPECIMENS

A simple loading arrangement is proposed to permit nearly constant strain energy release rate testing of double cantilever beam specimens. The inexpensive arrangement may be well suited to long term and environmental exposure testing of these specimens. An added advantage of the technique is that it also provides an attractive method to measure debond length. The geometrically nonlinear loading device provides constant strain energy release rate loading under idealized conditions. Analysis of the technique for realistic conditions reveals the appropriate test window for the device, and allows design guidelines to be developed. Experimental evaluation confirms the analytical predictions.