IMPACT ON COMPOSITE LAMINATED PLATES - AN INVERSE METHOD

A method is developed to detect the impact force history exerted on a laminated composite plate of rectangular dimensions from the recorded strain responses. The impact duration considered is in the order of 1 ms, which is frequently encountered in composite laminates struck by a foreign object at low velocities. A Green's function is constructed b ased on the classical lamination theory and the model superposition me thod to correlate the laminate response to the impact force. Instead o f obtaining the impact force history through the direct deconvolution process of a convolutional integral, a constrained optimization techni que is employed, and a convergent criterion is also proposed. The meth od is verified using both the signals numerically generated with a sig nal-to-noise of 2.0 and experimental data. The agreement is very satis factory in all the comparisons. This verifies the proposed method.