Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigating the normal and tangential peeling behaviour of gecko
  spatulae using a coupled adhesion-friction model   The present work investigates the normal and tangential peeling behaviour of
a gecko spatula using a coupled adhesion-friction model. The objective is to
explain the strong attachment and easy detachment behaviour of the spatulae as
well as to understand the principles behind their optimum design. Using
nonlinear finite element computations, it is shown that during
tangentially-constrained peeling the partial sliding of the spatula pad near
the peeling front stretches the spatula, thus increasing the strain energy and
leading to high pull-off forces. The model is used to investigate the influence
of various parameters on the pull-off forces -- such as the peeling angle,
spatula shaft angle, strip thickness, and material stiffness. The model shows
that increasing the spatula pad thickness beyond a certain level does not lead
to a significant increase in the attachment forces. Further, the easy
detachment behaviour of geckos is studied under tangentially-free peeling
conditions. It is found that the spatulae readily detach from the substrate by
changing their shaft angle and eventually peel vertically like a tape. Since
the present computational model is not limited by the geometrical, kinematical,
and material restrictions of theoretical models, it can be employed to analyse
similar biological adhesive systems.

28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph