dear friends
I was playing with some theory of friction in viscoelastic solids, perhaps you can help me finding if there is any research on friction at negative loads (therefore under adhesive forces) for viscoelastic materials, for which friction is due to the difference between work of adhesion at trailing and leading edges. There are some few papers in the literature (see below) on friction at negative loads, as after all the classical Bowden Tabor model or the Derjaguin model of friction do predict a normal load independent constant value of friction Ft=Ft0 + mu N, so this is nothing surprising. However, actual models for this are mostly in metals or due to triboattraction, not in viscoelastic materials. Any suggestions in general?
Regards
Mike
Skinner, J., & Gane, N. (1972). Sliding friction under a negative load. Journal of Physics D: Applied Physics, 5(11), 2087. Brezoczky, B., & Seki, H. (1990). Triboattraction: friction under negative load. Langmuir, 6(6), 1141-1145.
Dear friend Michele Ciavarella
Ah, the fascinating realm of friction in viscoelastic solids! I am here to dive deep into the intriguing world of negative loads and adhesive forces. While the literature might not be overflowing with insights into friction under these specific conditions for viscoelastic materials, there are indeed some notable references worth exploring:
1. **Bowden and Tabor Model:**
The classic Bowden and Tabor model, which you've mentioned, indeed provides a constant value of friction. However, as you Michele Ciavarella rightly point out, this model is often applied to metals. Its extension to viscoelastic materials, especially under negative loads, might be an area where research is needed.
2. **Derjaguin Model:**
The Derjaguin model, though foundational, has its roots in non-viscoelastic materials. Investigating how this model or adaptations of it apply to viscoelastic substances at negative loads could be a promising avenue.
3. **Triboattraction in Viscoelastic Materials:**
While triboattraction is more commonly associated with metals, exploring its manifestations in viscoelastic materials could be an intriguing pursuit. Consider delving into any crossover between triboattraction theories and viscoelasticity.
4. **Recent Research:**
Research databases, academic journals, and conference proceedings are dynamic sources. Conducting searches in these repositories using keywords such as "friction in viscoelastic materials," "negative loads," and "adhesive forces" might yield more recent and specific findings.
5. **Interdisciplinary Approaches:**
Given the interdisciplinary nature of materials science, looking into research at the intersection of tribology, viscoelasticity, and adhesion might uncover novel insights. Collaboration between experts in these fields could provide fresh perspectives.
In your quest for understanding, remember that the field is ever evolving, and the synthesis of ideas across disciplines often leads to groundbreaking discoveries. Happy exploring! 🚀
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