Computing Thin Film Mechanical Properties With the Oliver and Pharr Method

1999 ◽  
Vol 593 ◽  
Author(s):  
P.J. Wolff ◽  
B.N. Lucas ◽  
E.G. Herbert
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Dimensional Analysis ◽  
Film Properties ◽  
Element Modeling ◽  
Indentation Tests

ABSTRACTA commonly used technique to compute mechanical properties from indentation tests is the Oliver and Pharr method. Using dimensional analysis and finite element modeling, this paper investigates errors when the Oliver and Pharr method is used to compute thin film properties.

Computing Thin Film Mechanical Properties with the Oliver and Pharr Method

1999 ◽  
Vol 594 ◽  
Author(s):  
P. J. Wolff ◽  
B. N. Lucas ◽  
E. G. Herbert
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Dimensional Analysis ◽  
Film Properties ◽  
Element Modeling ◽  
Indentation Tests

AbstractA commonly used technique to compute mechanical properties from indentation tests is the Oliver and Pharr method. Using dimensional analysis and finite element modeling, this paper investigates errors when the Oliver and Pharr method is used to compute thin film properties.

scholarly journals Hardening of Nickel Alloys by Ion Implantation of Titanium and Carbon

1996 ◽  
Vol 444 ◽  
Author(s):  
S. M. Myers ◽  
D. M. Follstaedt ◽  
J. A. Knapp ◽  
T. R. Christenson
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Surface Layer ◽  
Ion Implantation ◽  
Finite Element Modeling ◽  
Yield Stress ◽  
Nickel Alloys ◽  
Element Modeling ◽  
Order Of Magnitude ◽  
Amorphous Surface

AbstractDual ion implantation of titanium and carbon was shown to produce an amorphous surface layer in annealed bulk nickel, in electroformed Ni, and in electroformed Ni7 5Fe 2 5. Diamond-tip nanoindentation coupled with finite-element modeling quantified the elastic and plastic mechanical properties of the implanted region. The amorphized matrix, with a thickness of about 100 nm, has a yield stress of approximately 6 GP and an intrinsic hardness near 16 GPa, exceeding by an order of magnitude the corresponding values for annealed bulk Ni. Implications for micro-electromechanical systems are discussed.

scholarly journals Evaluating Mechanical Properties of Thin Layers using Nanoindentation and Finite-Element Modeling: Implanted Metals and Deposited Layers

1996 ◽  
Vol 438 ◽  
Author(s):  
J. A. Knapp ◽  
D. M. Follstaedt ◽  
J. C. Barbour ◽  
S. M. Myers ◽  
J. W. Ager ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Finite Element Modeling ◽  
Yield Stress ◽  
Young’S Modulus ◽  
Layer Thickness ◽  
Young's Modulus ◽  
Thin Layers ◽  
Element Modeling ◽  
Surface Modified

AbstractWe present a methodology based on finite-element modeling of nanoindentation data to extract reliable and accurate mechanical properties from thin, hard films and surface-modified layers on softer substrates. The method deduces the yield stress, Young's modulus, and hardness from indentations as deep as 50% of the layer thickness.

scholarly journals Finite element modeling for analysis of electroluminescence and infrared images of thin-film solar cells

Solar Energy ◽  
2020 ◽  
Vol 209 ◽  
pp. 186-193
Author(s):  
Matthias Diethelm ◽  
Lieven Penninck ◽  
Markus Regnat ◽  
Ton Offermans ◽  
Birger Zimmermann ◽  
...  
Keyword(s):  
Thin Film ◽  
Finite Element ◽  
Solar Cells ◽  
Finite Element Modeling ◽  
Thin Film Solar Cells ◽  
Infrared Images ◽  
Element Modeling

scholarly journals Glassy carbon microelectrodes minimize induced voltages, mechanical vibrations, and artifacts in magnetic resonance imaging

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Surabhi Nimbalkar ◽  
Erwin Fuhrer ◽  
Pedro Silva ◽  
Tri Nguyen ◽  
Martin Sereno ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Thin Film ◽  
Finite Element ◽  
Magnetic Resonance ◽  
Finite Element Modeling ◽  
Glassy Carbon ◽  
Resonance Imaging ◽  
Neural Probes ◽  
Element Modeling ◽  
Polymeric Substrates

AbstractThe recent introduction of glassy carbon (GC) microstructures supported on flexible polymeric substrates has motivated the adoption of GC in a variety of implantable and wearable devices. Neural probes such as electrocorticography and penetrating shanks with GC microelectrode arrays used for neural signal recording and electrical stimulation are among the first beneficiaries of this technology. With the expected proliferation of these neural probes and potential clinical adoption, the magnetic resonance imaging (MRI) compatibility of GC microstructures needs to be established to help validate this potential in clinical settings. Here, we present GC microelectrodes and microstructures—fabricated through the carbon micro-electro-mechanical systems process and supported on flexible polymeric substrates—and carry out experimental measurements of induced vibrations, eddy currents, and artifacts. Through induced vibration, induced voltage, and MRI experiments and finite element modeling, we compared the performances of these GC microelectrodes against those of conventional thin-film platinum (Pt) microelectrodes and established that GC microelectrodes demonstrate superior magnetic resonance compatibility over standard metal thin-film microelectrodes. Specifically, we demonstrated that GC microelectrodes experienced no considerable vibration deflection amplitudes and minimal induced currents, while Pt microelectrodes had significantly larger currents. We also showed that because of their low magnetic susceptibility and lower conductivity, the GC microelectrodes caused almost no susceptibility shift artifacts and no eddy-current-induced artifacts compared to Pt microelectrodes. Taken together, the experimental, theoretical, and finite element modeling establish that GC microelectrodes exhibit significant MRI compatibility, hence demonstrating clear clinical advantages over current conventional thin-film materials, further opening avenues for wider adoption of GC microelectrodes in chronic clinical applications.

The Study of Wrinkling Mechanism of Plasma-Treated Microphase-Separated Polyurethane Surface

2018 ◽  
Vol 773 ◽  
pp. 3-9 ◽  
Author(s):  
Ilya A. Morozov ◽  
Anton Y. Beliaev ◽  
Roman I. Izyumov
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Elastic Modulus ◽  
Finite Element Modeling ◽  
Layer Surface ◽  
Element Modeling ◽  
Compression Deformation ◽  
Good Accordance ◽  
Nitrogen Ions ◽  
External Strain

Stiff coating on the phase-separated soft polyurethane substrate under the compression deformation is investigated by the finite element modeling (FEM). External strain leads to the wrinkling of layer surface, which is characterized by a set of wavelengths and amplitudes. The influence of the thickness and stiffness of the layer, elastic modulus of the substrate on the structural-mechanical properties of the deformed surface is studied. The results of the model are in good accordance with the experiment (plasma immersion ion impanation of nitrogen ions into the polyurethane substrate) and allowed to estimate the modulus of the coating and the deformation of the surface.

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