Impact response of a laminated beam on an elastic foundation.

摘要

An experimental and numerical investigation of the impact response of laminated composites on an elastic foundation is performed. The impact configuration uses a modification to the split-hopkinson bar setup and laser vibrometers are used to measure the displacements during the test. The histories of contact force, front face and back face displacement are recorded. This allows the indentation to be recorded during the impact event. The damage state is also recorded after each test is complete.; Numerical simulations of the impact event are conducted with the LSDYNA commercial finite element software. Information obtained from the impact tests is used along with the finite element results to predict the displacement and indentation response along with the damage state.; The experimental results show that damage can be detected via the force-time response, FFT analysis of the force-time response and the indentation-time response. The indentation is found to be the most sensitive means to detect real-time damage. Results from the damage study show that the foundation has a marked effect on the damage state. Analysis of the stresses beneath the contact point along with the experimental results suggest that the elastic foundation can alter the damage evolution due to the redistribution of stresses. A mechanistic explanation of failure is provided based on the overall results from both the experimental and analytical work.