By Zhilong Peng
The thesis systematically investigates the standards which impact many animals’ powerful adhesion skills and micro-reversible adhesion mechanisms, together with the geometric rules in their adhesion, relative humidity, floor roughness and pre-tension. reports exploring organic adhesion mechanisms will not be simply of significant value for the layout of complex adhesive fabrics and adhesion structures for micro-climbing robots, but in addition very invaluable for resolving the matter of adhesion failure in MEMS/NEMS.
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Additional resources for Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate
From Chen et al. , we can infer the peeling-off force should keep a constant only if the subdivision adhesion length is identical in a periodic crack model for the present problem. The value of the peeling-off force also corresponds to the subdivision adhesion length as shown in Fig. 3c if it is not larger than the saturation length. Otherwise, the peeling-off force will achieve the maximum. Although the model to simulate the effect of surface roughness is simple, the results can still reveal qualitatively that the peeling-off force is independent of the crack length only if the crack length is not larger than the difference in the entire adhesion length and the effective length found in Sect.
8. For simplicity, the effective adhesion length is assumed to be approximately identical to the saturation length, which is denoted as Lc in Fig. 8. Later, a more realistic model would be established in our future work. Assuming the geometry of peelingoff part near the substrate as a circular shape with radius R and arc length LR . p is a peeling force acting at the end of the nanoﬁlm. Fig. 4 Theoretical Analysis 39 It is reasonable to assume the molecular interaction between the nanoﬁlm and substrate as that described by the Tvergaard-Hutchinson model, as shown in Fig.
In the following simulations, the length of nanoﬁlm L is assumed to be 50 nm. The constitutive relation of cohesive surface elements was developed by Tvergaard and Hutchinson . Other cohesive models [27–31] could in principle also be used to model molecular adhesion. However, the Tvergaard-Hutchinson model is chosen in the present study because it preserves the van der Waals energy regardless of the peeling orientation. Whereas other cohesive models with various consideration of tension versus shear dominated separation do not necessarily preserve the interaction energy .
Bio-inspired Studies on Adhesion of a Thin Film on a Rigid Substrate by Zhilong Peng