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oliver oreilly's picture

A Geometric Perspective on Gimbal Lock in the Apollo program

The phenomenon of gimbal lock rose in prominence during the time  of NASA's Apollo program. Inside the inertial measurement unit of the Apollo spacecraft was a stable (inertial) platform about which the spacecraft rotated. The hinged platform was suspended in two gimbals to give it three degrees of freedom. Its role was to give an accurate measure of the spacecraft's orientation. At a particular orientation of the spacecraft, the gimbals became coplanar and control torques became ineffective at stabilizing the platform.

karelmatous's picture

Solving Nonlinear PDEs with a priori accuracy using wavelets

We present a numerical method which exploits the biorthogonal interpolating wavelet family, and second-generation wavelets, to solve initial–boundary value problems on finite domains. Our predictor-corrector algorithm constructs a dynamically adaptive computational grid with significant data compression, and provides explicit error control. Error estimates are provided for the wavelet representation of functions, their derivatives, and the nonlinear product of functions.

distortion control in continum shell elements

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Hi!

I am new to abaqus and am simulating biiaxial test on GFRP cross ply laminates. The simulation stops saying " excessive distortion of 2 elements". Can someone please suggest a detailed solution. 

Ps- im a beginner , so I request a detailed suggestion please.

 

Thanks.

Yash

Jingjie Yeo's picture

Multiscale modeling of keratin, collagen, elastin and related human diseases: Perspectives from atomistic to coarse-grained molecular dynamics simulations

https://doi.org/10.1016/j.eml.2018.01.009 Scleroproteins are an important category of proteins within the human body that adopt filamentous, elongated conformations in contrast with typical globular proteins. These include keratin, collagen, and elastin, which often serve a common mechanical function in structural support of cells and tissues. Genetic mutations alter these proteins, disrupting their functions and causing diseases.

shimahajimirza's picture

Open Post-doc position at Energy- Control and optimization lab

Energy, Control and Optimization (ECO) lab https://www.ecolab.tamu.edu/ in the Department of Mechanical Engineering at Texas A&M University has one post-doc position. The research project is about energy conversion in Nano-materials and thin film solar cells. Candidates should have a strong background and interests in Radiative Heat Transfer, Nano-Materials, Nanofabrication, Computational Methods and Machine Learning. Programming experience in MATLAB or Python is necessary.

Vivekanandan A's picture

Using LEFM for analyzing crack in a non linear material

Dear all,

I am trying to find the crack tip SIF in Polyurethane which an elastomer. It behaves like a nonlinear elastic material with the initial small linear elastic region. Can I use a multi-parameter stress field equation (William's crack tip stress field equation) to get the SIF of the crack tip.

Thank you

Jingjie Yeo's picture

Advancing the frontiers of silk fibroin protein-based materials for futuristic electronics and clinical wound-healing (Invited review)

https://doi.org/10.1016/j.msec.2018.01.007 The present review will introduce the basic concepts of silk-based electronics/optoelectronics including the latest technological advances on the use of silk fibroin in combination with other functional components, with an emphasis on improving the performance of next-generation silk-based materials. It also highlights the patterning of silk fibroin to produce micro/nano-scale features, as well as the functionalization of silk fibroin to impart antimicrobial (i.e. antibacterial) properties.

shimahajimirza's picture

Open-PhD Positions in Energy Conversion in Nano Materials and Solar Cells

Energy, Control and Optimization (ECO) https://www.ecolab.tamu.edu/ in the Department of Mechanical Engineering at Texas A&M University has two open PhD positions. The research project is about energy conversion in Nano-materials and thin film solar cells. Candidates should have a strong background and interests in Radiative Heat Transfer, Nano-Materials, Nano fabrication, Computational Methods and Machine Learning. Programming experience in MATLAB or Python is necessary.

Antonio Papangelo's picture

Adhesion between a power-law indenter and a thin layer coated on a rigid substrate

Abstract: In the present paper we investigate indentation of a power-law axisymmetric rigid probe in adhesive contact with a "thin layer" laying on a rigid foundation for both frictionless unbounded and bounded compressible cases. The investigation relies on the "thin layer" assumption proposed by Johnson, i.e. the layer thickness being much smaller than the radius of the contact area, and it makes use of the previous solutions proposed by Jaffar and Barber for the adhesiveless case.

Modeling/defining Loop of blocks of different load amplitude

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Dear all

In the experiment setup, the fatigue loading spectrum has a loop of 2 blocks of load amplitude. First load amplitude the higher applied for 2X time period followed by lower load amplitude for X time period then the loop repeated till failure.  the load sequence was High-Low and Low-High in this loop. X was in thousands so might be suggested as the cyclic response will be stabilized in the first 10 cycles, the first block will dominate the fatigue behaviour at least till fracture, or damage initiation.

sergkuznet's picture

Topology optimization of magnetic source distributions for diamagnetic and superconducting levitation

Topology optimization is used to obtain a magnetic source distribution providing levitation of a diamagnetic body or type I superconductor with maximized thrust force. We show that this technique identifies non-trivial source distributions and may be useful to design devices based on non-contact magnetic suspension and other magnetic devices, such as micro-magneto-mechanical devices, high field magnets etc.

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