نتایج جستجو برای: nanoindentation

تعداد نتایج: 2668  

2014
Paul G. Allison Rogie I. Rodriguez Robert D. Moser Brett A. Williams Aimee R. Poda Jennifer M. Seiter Brandon J. Lafferty Alan J. Kennedy Mei Q. Chandler

The hierarchical architecture of protective biological materials such as mineralized fish scales, gastropod shells, ram's horn, antlers, and turtle shells provides unique design principles with potentials for guiding the design of protective materials and systems in the future. Understanding the structure-property relationships for these material systems at the microscale and nanoscale where fa...

2016
Jing Han Song Xu Jiapeng Sun Liang Fang Hua Zhu

Large-scale molecular dynamics simulations of nanoindentation on a (100) oriented silicon surface were performed to investigate the mechanical behavior and phase transformation of single crystalline silicon. The direct crystalline-to-amorphous transformation is observed during the nanoindentation with a spherical indenter as long as the applied indentation strain or load is large enough. This a...

2014
Hazel Garvie-Cook Kit Frederiksen Karsten Petersson Richard Guy Sergey Gordeev

Polymeric film-forming systems for dermal drug delivery represent an advantageous alternative to more conventional topically applied formulations. Their mechanical properties and homogeneity can be characterised with atomic force microscopy (AFM), using both imaging and nanoindentation modes, and Raman micro-spectroscopy mapping. Film-forming polymers, with and without a plasticizer and/or beta...

2016
Ippei Hamanaka Misa Iwamoto Lippo V. J. Lassila Pekka K. Vallittu Yutaka Takahashi

Objective This study investigated the wear resistance of injection-molded thermoplastic denture base resins using nanoindentation instrument. Materials and methods Six injection-molded thermoplastic denture base resins (two polyamides, two polyesters, one polycarbonate, one polymethylmethacrylate [PMMA]) and a PMMA conventional heat-polymerized denture-based polymer control were tested. Elastic...

2017
Verena Maier-Kiener Karsten Durst

Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus. By adapting standard nanoindentation test methods, simple protocols capable of probing thermally activated deformation processes can be accomplished. Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at various indentation depths. ...

2006
Siqun Wang Seung-Hwan Lee William T.Y. Tze Tim Rials George M. Pharr

Cellulose fibers, cell wall fragments and cellulose microfibrils can be used as reinforced materials for biocomposite manufacture. Understanding nano-mechanical properties of those materials will be very useful to show their full theoretical potential. Nanoindentation testing is a technique that determines the mechanical properties of a material in the sub-micron/nano scale. The test involves p...

Journal: :Small 2010
Jordi Sort Luiz Fernando Bonavina Aïda Varea Carlos Souza Walter J Botta Claudio S Kiminami Claudemiro Bolfarini Santiago Suriñach Maria Dolors Baró Josep Nogués

Periodic arrays of micrometer-sized ferromagnetic structures with perpendicular magnetic anisotropy are prepared by nanoindentation at the surface of a Fe(67.7)B(20)Cr(12)Nb(0.3) glassy ribbon initially showing in-plane magnetic anisotropy. The indented regions exhibit enhanced coercivity and saturation magnetization with respect to the surrounding nondeformed matrix. These effects are due to a...

Journal: :Interface focus 2014
Jinju Chen

Nanobiomechanics of living cells is very important to understand cell-materials interactions. This would potentially help to optimize the surface design of the implanted materials and scaffold materials for tissue engineering. The nanoindentation techniques enable quantifying nanobiomechanics of living cells, with flexibility of using indenters of different geometries. However, the data interpr...

2008
Oliver Franke Andrea M. Hodge

This work is focused on testing biological samples under conditions as close as possible to the natural environment. The data generated can be used to better understand joint damage mechanisms (e.g., osteoarthritis), improve implants, and as a guide for the design of biomimetic materials. Mechanical testing of biological materials is a continuously developing fi eld that requires the testing of...

2013
Chengli Shi Hongwei Zhao Hu Huang Lixia Xu Luquan Ren Meilin Bai Jianping Li Xiaoli Hu

In reality, it is a common phenomenon to perform nanoindentation test while the indenter is not perpendicular to the sample, which would cause the properties such as hardness and elastic modulus of sample to be somehow different from the true values. In this paper, the effects of indenter tilt on the results of nanoindentation were studied by finite element analysis (FEA) simulation. The result...

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