From the Call for Papers:
Microelectromechanical Systems (MEMS) represent the integration of miniaturized mechanical, chemical, fluidic, and optical devices with microelectronics. MEMS have a broad range of applications in optical- and radio-frequency communications, physical/chemical/biosensing, display technology, drug delivery, and the manipulation and isolation of cells.
First announcement and call for papers.
The symposium "Fundamentals of Nanoindentation and Nanotribology" will run for the fourth time at the Fall, 2007, Materials Research Society Meeting, Boston, MA, USA.
Dear Forum Members:
Does anyone have a chance to simulate a corrosion layer using ABAQUS? If yes, could you please explain to me what type of constitutive model you use; i.e. UMAT?
Thank you and best regards,
This set is related to buckle-driven delamination, crack bridging, and interfacial cracks.
Dear mechanicians,
I am trying to get the information, orientation on the modelling of thermomechanical treatment of steel (Duplex stainless steel), since during the treatment process, both tensile stress and temperature (150oC-300oC) are applied for a time interval and as a result the original phases of material change to new phases. After the thermomechanical treatment, we get the new materials with different mechanical properties such as elastic limit, yield stress, ductility....
Matrix cracking in composites and the competition between penetration and deflection when a crack approaches an interface, and the competition between advance in the interface and kinking out of the interface for an interface crack.
Would anyone have spec sheets for the load cell of the LIDO multijoint systemII?
I want to convert the torque readings from volts to newton-meter. I know LIDO dynamometer gives output as torque. But, our lab does not have any spec sheets or manuals, as this system is an old donated system.
New York Times today carried an article on the anxiety of getting in college. There is absolutely nothing surprising in the article if you are a parent of a college going child in the US. It may serve as a warning for people in other countries who think that their eduction systems are breaking down and want a dose of American experience.
Indentation is widely used to measure material mechanical properties such as hardness, elastic modulus, and fracture toughness (for brittle materials). Can one use indentation to extract material elastoplastic properties directly from the measured force-displacement curves? Or simply, is it possible to obtain material stress-strain curves from the corresponding indentation load-displacement curves? In an upcoming paper in JMPS titled "On the uniqueness of measuring elastoplastic properties from indentation: The indistinguishable mystical materials," Xi Chen and colleagues at Columbia University and National Defense Academy, Japan show the existence of "mystical materials", which have distinct elastoplastic properties yet they yield almost identical indentation behaviors, even when the indenter angle is varied in a large range. These mystical materials are, therefore, indistinguishable by many existing indentation analyses unless extreme (and often impractical) indenter angles are used. The authors have established explicit procedures of deriving these mystical materials. In many cases, for a given indenter angle range, a material would have infinite numbers of mystical siblings, and the existence maps of the mystical materials are also obtained. Furthermore, they propose two alternative techniques to effectively distinguish these mystical materials. The study in this paper addresses the important question of the uniqueness of indentation test, as well as providing useful guidelines to properly use the indentation technique to measure material elastoplastic properties.
