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Article: Influence of build direction on the fracture mechanism of 3D printed octet lattices

Submitted by susanta on

Link:    https://authors.elsevier.com/c/1kR1E7tcTWs-HG    It provides 50 days' free access to the article. 

Influence of build direction on the fracture mechanism of 3D printed octet lattices,

Leonardo's universal friction coefficient is found to be universal after all!

Submitted by Mike Ciavarella on
It turns out that friction coefficient 0.25 suggested as universal by Leonardo da Vinci more than 500 years ago has some universaility, as minimum friction coefficient for any granular material: it makes me proud as italian ;) 
I guess it would be interesting to show this experimental result also theoretically or numerically, any interest?
 

The Second Law as a constraint and admitting the approximate nature of constitutive assumptions

Submitted by Amit Acharya on

A scheme for treating the Second Law of thermodynamics as a constraint and accounting for the approximate nature of constitutive assumptions in continuum thermomechanics is discussed. An unconstrained, concave, variational principle is designed for solving the resulting mathematical problem. Cases when the Second Law becomes an over-constraint on the mechanical model, as well as when it serves as a necessary constraint, are discussed.

A new analytical model for fibrillar viscoelastic adhesion using the Schapery or the Shrimali-Lopez-Pamies nucleation models

Submitted by Mike Ciavarella on
Hello:  I would be interested in any comment about this preprint on fibrillar viscoelastic adhesion, originally devised by Schargott Popov and Gorb, where we use for the first time not only the Schapery model for nucleation of cracks, but also the Shrimali and Lopez Pamies, which leads to quite stronger enhancement of adhesion (the limit is the square of the Schapery one), and pull-off with no real prior propagation phase.  Propagation with Schapery nucleation criterion is found to be qualitatively similar to the Schapery and Persson-Brener propagation theories, except that