Inverse Method to Measure the Axial Modulus of Composite Materials Under Tension

摘要

In this report, an inverse method is developed to measure the axial modulus ofmaterials subjected to tensile loads. The approach is intended for use on long composite structures whose modulus is frequency dependent. The governing differential equations of a laboratory test configuration are solved and then inverted at three locations that correspond to sensor transfer functions. These three equations are next combined in such a way that the complex-valued axial modulus is equal to a function of the measured data and the known system parameters. This expression is a closed-form measurement of the modulus at each test frequency. An experiment is included to validate the method. Comparisons between the transfer function data and the model expressed with the measured modulus are in close agreement. (MM).