Blog posts

A criterion for the mean stress effect correction in the shift factor approach for variable amplitude life prediction is presented for both smooth and notched specimens. The criterion is applied to the simple idea proposed by the authors in a previous note that Gaßner curves can be interpreted as shifted Wöhler curves. The mean stress correction used has been proposed by Smith, Watson and Topper and, more in general, by Walker.

Tensional wrinkles are widely observed in elastic thin films, with mono-orientation of wrinkles being usually perpendicular to the stretching direction. Here, by changing material orthotropic direction, we present orientable wrinkles in uniaxially stretched orthotropic membranes. To quantitatively explore orthotropy-related wrinkles and their morphological evolution, we develop a mathematical model by introducing orthotropic, elastic constitution into the extended F\"oppl-von K\'arm\'an nonlinear plate theory that can describe large in-plane anisotropic deformations.

https://doi.org/10.1016/j.compscitech.2019.107832

Link to author's personalized share link for free access until November 19 2019: https://authors.elsevier.com/a/1ZpgjyZzKoGVz

Abstract:

A postdoc in the area of flexible skin for morphing wings is available at Khalifa University, UAE. 

Two Ph.D. positions and one postdoc position are available in Wang Research lab (https://www.wangresearchlab.com) in Mechanical Engineering at the University of Missouri, Columbia.

Ph.D. positions

I am seeking to hire a postdoc in the area of coupled discrete-continuum modeling. The position is expected to start on 11/01/2019. Applicants who have experience with Itasca software (specifically, FLAC and PFC) are strongly encouraged to apply.

A graduate research position is now available at George Mason University for research in fluid mechanics. 

We seek to modify turbulent flows by targeting drag reducing hairpin vortices using micro-particles carrying polymers.

Preference will be given to students with an M.S. in mechanical engineering or related fields (e.g. aerospace engineering, physics, mathematics).

A strong background in fluid mechanics, applied mathematics, and numerical methods is preferred. In addition, fluency in FORTRAN is highly desired.

There is ample evidence of ThermoElastic Instabilities (TEI) occurring in sliding contacts. The very first experiments of JR Barber in 1969 suggested wear interacts in the process of localization of contact into ”hot spots”. However, studies on the interaction of TEI with wear are scarce. We consider the case of two sliding halfspaces and make a perturbation analysis permitting the formation of waves migrating over the two bodies, in presence of wear. We find that for exactly identical bodies wear does not affect the stability boundary.