Conventional resistance strain gauges

For example, a delamination in a composite layup produces strain distribution in the surroimding area that is substantially different from that in a pristine zone [20]. Strain monitoring can be done with conventional electrical resistance strain gauges or with fiber optics. The latter offer the capability of having several measuring locations that can be individually addressed on the same fiber. Kesavan et al. [20] used conventional strain gauges to monitor delaminalion in a composite T-joint. The strain gauges were placed on the outside of the joint in zones deemed sensitive to strain redistribution due to delaminations. 

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