Nondestructive test for flexible composites

摘要

A method for testing internal differences in reinforced flexible composites including placing a flexible composite on a rigid support structure, tapping the composite with a tapper of predetermined mass, determining a value representative of the impact duration of the tap and/or computing a value representative of the local stiffness of the composite. The composite may be a power transmission belt or portion thereof with tensile cord reinforcement. The method is useful for comparing the degree of penetration of elastomer into the tensile cord, for example in a cast polyurethane toothed belt.

主权项

1. A method of testing internal structural variations within a flexible, elastomeric-matrix, composite article comprising an elastomeric matrix and a reinforcing fiber structure embedded therein, said method comprising the steps of:
mounting said composite article in a fixed position; tapping the article; determining the impact duration of the tap; and comparing the impact duration to a reference value.