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A very simple solution to the rolling contact problem will falling friction

Submitted by Mike Ciavarella on

In rail-wheel contact modelling, there is a huge industrial interest to model accurately rolling contact of hard bodies with friction for predicting fatigue, squeal, noise, vehicle dynamics.     In the literature, the case of Carter 1926 has been extended with numerical codes known as FASTSIM and CONTACT which are based on algorithms by JJ Kalker.     However, there is a serious problem to model falling rate-dependent friction, which gives unexpected instabilities and unclear solutions.

Funded PhD position in Engineering Mechanics or Geomechanics

Submitted by Yida Zhang on

Our Multiphyical Geomechanics group (Link) at the Civil Engineering department of the University of Colorado Boulder has an opening PhD position for Spring 2023 or Fall 2023 in the area of Engineering Mechanics or Geomechanics. Please see the PDF attached for more details. Thank you!

Funded PhD positions in the area of additive manufacturing of metals and alloys

Submitted by HamidAbdolvand on

We have two PhD positions in the area of additive manufacturing of metals and alloys. We are looking for self-motivated and enthusiastic students with a degree in mechanical or materials engineering.

Students with following backgrounds are strongly recommended to apply:

Postdoc position at Imperial College London on hydrogen assisted fracture

Submitted by Emilio Martíne… on

The Mechanics of Infrastructure Materials research group are looking to hire a Postdoctoral Research Associate (PDRA) to work in the prediction of hydrogen embrittlement using computational methods. The Research Associate will work under the supervision of Dr Emilio Martínez-Pañeda and the project is supported by TENARIS. 

 

One NSF-funded PhD position in computational polymer science at the University of Vermont

Submitted by Jihong Ma on

One NSF-funded Ph.D. position is available immediately in the area of computational polymers in the group of Dr. Jihong Ma (https://sites.google.com/umn.edu/jihong-ma-group/home?authuser=0) at the University of Vermont.

A comment on a hybrid asperity-Persson friction rubber theory by A Emami, S Khaleghian and S Taheri. Friction 9(6): 1707--1725 (2021)

Submitted by Mike Ciavarella on

dear collegues, I may be interested to share your views on an "asperity theory" modified Persson's rubber friction contact mechanics theory which I find not clearly motivated and seems to lead to erroneous conclusions ---- but I am also unable to reproduce the results claimed by the authors. The preprint is here, and the original paper attached: https://www.researchgate.net/publication/359392510

Water as a “glue”: Elasticity-enhanced wet attachment of biomimetic microcup structures

Submitted by Zhengwei Li on

Octopus, clingfish, and larva use soft cups to attach to surfaces under water. Recently, various bioinspired cups have been engineered. However, the mechanisms of their attachment and detachment remain elusive. Using a novel microcup, fabricated by two-photon lithography, coupled with in situ pressure sensor and observation cameras, we reveal the detailed nature of its attachment/detachment under water.