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Profilometers using Low Coherence Interferometry used by NASA to measures thickness

Submitted by profilometer on

Using a fiber-based optical profilometer NASA measures the thickness of liquid nitrogen in cryogenic chambers at its Propulsion Systems lab because these profilometers use fiber-based probes which can withstands the extreme environment, can be located hundreds of meters away from the interferometer and fit in the tight chamber which standard full-field profilometers with a human operator could not. The signal quality stays constant over the distance.

Nonlinear static in SAP 2000 (Problem with hinges assignment)

Submitted by hazrina on

Hi everyone,

Currently I am working with nonlinear static pushdown analysis in SAP 2000. I understand that when the analysis gives a warning 'unable to find a solution at step 20' means that the assigned hinges are compete to unload i.e where one hinges requires the applied load to increase while the other requires the load to decrease.

My question is, how are we going to overcome this warning?..Is there any better solution for this?

Looking forward for anyone to reply.

Best Regards,

Hazrina Mansor

ANSYS Meshing Problem

Submitted by dmadw0man on

Hi I am currently using ANSYS 13 Workbench to do FEA on .igs files of leg bones (femur, tibia, and patella), I am new to ANSYS and I am having trouble meshing the bones. I am able to mesh the bones individually however when I import the whole leg assembly (assembled in proENGINEER) it will not mesh. Does anyone know how I can fix this?

 

 

Post-doctoral Position in the Ohio State University

Submitted by Ningyu Wang on

Post-doctoral position is available in the area of ultrasonic material characterization and nondestructive evaluation (strong background and experience in ultrasonic experiment and modeling are required). The position is supported from research grants. The focus area is ultrasonic study of nonhomogenous materials like polycrystalline materials, composites and adhesive bonds. State of the art ultrasonic laboratories and other characterization facilities are available. More details will be provided to interested individuals.

Interested candidates should contact

ASME IMECE 2012, “Mechanics of Adhesion” symposium

Submitted by Jianliang Xiao on

Adhesion has long been an important issue for mechanics and
many other disciplines. Its influence spans macro-, micro-, nano- and molecular
scales. When size goes down, adhesion plays a more and more significant role.
Many important technologies attribute to adhesion, such as transfer printing
for advanced microfabrication, super adhesives inspired by gecko foot hairs,
and self-assembly. Adhesion also has strong implications on the behavior of
nanomaterials (such as nanotubes and graphenes) and biological systems (such as
cells). This minisymposium "Mechanics of Adhesion" is to provide a