Beilstein J. Nanotechnol.2014,5, 630–638, doi:10.3762/bjnano.5.74
mushroom-like fibers is investigated by implementing the Dugdale–Barenblatt cohesivezonemodel into finite elements simulations. It is found that the magnitude of pull-off stress depends on the edge angle θ and the ratio of the tip radius to the stalk radius β of the mushroom-like fiber. Pull-off stress
results with findings in this work in section Results in detail.
In this work we study the effect of geometry, defined by the edge angle θ and the ratio of the tip radius to the stalk radius β, on pull-off stress of mushroom-like fibers by using a cohesivezonemodel and finite elements (FE) simulations
. Description of the cohesivezonemodel and numerical simulations are included in sections “Cohesivezonemodel” and “Numerical simulations”, respectively. After that, the results of the finite element simulations are presented, and in the subsequent section the detachment behavior of individual fibers, the
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Figure 1:
Scanning electron microscope image of polyurethane mushroom-like fibers with 4 µm stalk radius, 8 µ...
Beilstein J. Nanotechnol.2014,5, 419–437, doi:10.3762/bjnano.5.50
of the finite-range attraction. The results can benefit the interpretation of atomic force microscopy in liquid environments and the modeling of multi-asperity contacts.
Keywords: cohesivezonemodel; contact mechanics; environmental; fluid squeeze-out; nanomechanics; single-asperity contacts
, Yushenko, and Derjaguin [8]. Lastly, Maugis [9] used a cohesive-zonemodel introduced by Dugdale (MD) and found analytical solutions for intermediate-range adhesion at arbitrary values of μT.
Although single-asperity, linearly-elastic, adhesive contacts mechanics is a rather mature field [10], two key
cohesivezonemodel [16], the crack evolution function [17], or the traction-separation relation [18]. However, it is not clear how the results obtained for mode I fracture geometries relate to Hertzian contacts. This is the main reason why the results obtained within the cohesivezonemodel cannot be
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Figure 1:
Geometry of the deformed tip (upper grey solid), the substrate (lower solid), and the reference tip...