In the past two years, there have been a large number of publications on the topic of biomimetic dry adhesives from modeling, fabrication and testing perspectives. We review and compare the most recent advances in fabrication and testing of these materials. While there is increased convergence and consensus as to what makes a good dry adhesive, the fabrication of these materials is still challenging, particularly for anisotropic or hierarchal designs. Although qualitative comparisons between different adhesive designs can be made, quantifying the exact performance and rating each design is significantly hampered by the lack of standardized testing methods. Manufacturing dry adhesives, which can reliably adhere to rough surfaces, show directional and self-cleaning behavior and are relatively simple to manufacture, is still very challenging-great strides by multiple research groups have however made these goals appear achievable within the next few years.
This paper presents a new means for collecting fiber Bragg grating (FBG) data during
drop-tower measurements used to assess damage to composite structures. The
high repetition-rate collection process reveals transient features that cannot be
resolved in quasi-static measurements. The experiments made at a repetition rate of
about 500 Hz show that the detected FBG spectrum broadens for a short period of
time and relaxes quickly to a narrower static state. Furthermore, this relaxation
time increases dramatically as the strike count increases. The information gained
by such measurements will enhance the ability to characterize and distinguish
failure modes and predict the remaining lifetime in composite laminate structures.
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