scholarly journals Quantitative Characterization of Mechanical Properties using Instrumented Indentation

2011 ◽  
Vol 10 ◽  
pp. 3162-3172 ◽  
Author(s):  
Young-Cheon Kim ◽  
Won-Seok Song ◽  
Jong-Heon Kim ◽  
Kug-Hwan Kim ◽  
Dongil Kwon
Keyword(s):  
Mechanical Properties ◽  
Instrumented Indentation ◽  
Quantitative Characterization

A MULTIFUNCTIONAL AND PORTABLE OPTICAL SENSOR FOR QUANTITATIVE CHARACTERIZATION OF 3D SURFACE TEXTURE PROPERTIES

2010 ◽  
Vol 07 (04) ◽  
pp. 269-284
Author(s):  
YANTAO SHEN ◽  
YONGXIONG WANG ◽  
NING XI
Keyword(s):  
Mechanical Properties ◽  
Surface Texture ◽  
Surface Characterization ◽  
Texture Features ◽  
Mechanical Impedance ◽  
Quantitative Characterization ◽  
Texture Properties ◽  
Surface Patterns ◽  
3D Surface Texture

Surface characterization technologies are generally sorted into two categories: noncontact and contact-based technologies. Among these technologies, no one can stand out to simultaneously and rapidly measure both surface patterns/textures and mechanical properties such as softness, friction, and mechanical impedance. In this paper, we have addressed this problem and developed a multifunctional and portable surface texture sensor through combination of both contact and noncontact optical surface profiling mechanisms. The developed sensor relying on an optomechanical principle can be efficiently used for quantitative characterization of surface texture properties including 3D texture pattern, roughness, and even mechanical properties like softness, etc. As one of the important applications, we have used the sensor to measure and analyze texture properties of extensive automotive interior leather sample surfaces. The results demonstrate that the sensor can effectively assist the interior designer to quantify and classify essential texture features of automobile interior surfaces.

scholarly journals The Influence of the Third Element on Nano-Mechanical Properties of Iron Borides FeB and Fe2B Formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) Alloys

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4155
Author(s):  
Ivana Kirkovska ◽  
Viera Homolová ◽  
Ivan Petryshynets ◽  
Tamás Csanádi
Keyword(s):  
Mechanical Properties ◽  
Indentation Size Effect ◽  
Microstructural Characterization ◽  
Indentation Hardness ◽  
Indentation Modulus ◽  
Instrumented Indentation ◽  
X Ray Diffraction ◽  
Alloying Element ◽  
X Ray

In this study, the influence of alloying elements on the mechanical properties of iron borides FeB and Fe2B formed in Fe-B-X (X = C, Cr, Mn, V, W, Mn + V) alloys were evaluated using instrumented indentation measurement. The microstructural characterization of the alloys was performed by means of X-ray diffraction and scanning electron microscope equipped with an energy dispersive X-ray analyzer. The fraction of the phases present in the alloys was determined either by the lever rule or by image analysis. The hardest and stiffest FeB formed in Fe-B-X (X = C, Cr, Mn) alloys was observed in the Fe-B-Cr alloys, where indentation hardness of HIT = 26.9 ± 1.4 GPa and indentation modulus of EIT = 486 ± 22 GPa were determined. The highest hardness of Fe2B was determined in the presence of tungsten as an alloying element, HIT = 20.8 ± 0.9 GPa. The lowest indentation hardness is measured in manganese alloyed FeB and Fe2B. In both FeB and Fe2B, an indentation size effect was observed, showing a decrease of hardness with increasing indentation depth.

Characterization of Local Stress-Strain Behavior in WWER 440 Weld and Base Metal by Instrumented Indentation Technique

2014 ◽  
Vol 606 ◽  
pp. 7-10
Author(s):  
Petr Haušild ◽  
Aleš Materna ◽  
Jan Siegl ◽  
Miloš Kytka ◽  
Radim Kopřiva
Keyword(s):  
Mechanical Properties ◽  
Base Metal ◽  
Nuclear Reactor ◽  
Local Stress ◽  
Metallographic Analysis ◽  
Instrumented Indentation ◽  
Stress Strain ◽  
Indentation Technique ◽  
Strain Behavior

15Ch2MFA (base metal) as well as 10ChMFT (weld) steels used for WWER 440 nuclear reactor pressure vessel manufacturing present a gradient in mechanical properties through the wall thickness, which can hardly be assessed by conventional testing such as tensile or Charpy tests. Mechanical properties in the weld and base metal were therefore determined by performing a series of instrumented indentations across the weld at room temperature. The results were treated by so-called automated ball indentation technique. Local stress-strain behavior obtained by instrumented indentation was correlated to the tensile test data and microstructure characterized by metallographic analysis.

scholarly journals THREE-DIMENSIONAL RECONSTRUCTION AND VISUALIZATION OF PLANT CELLS

2020 ◽  
Vol 5 ◽  
pp. 28
Author(s):  
Sharifa Zaman ◽  
B. Fatima
Keyword(s):  
Mechanical Properties ◽  
Image Processing ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Plant Cells ◽  
Quantitative Characterization ◽  
And Topology ◽  
Short Period ◽  
Dimensional Reconstruction

The mechanical properties (like sensory texture etc.) of plants/fruits directly depend on their microstructures. Therefore, it is very important to well understand the geometry and topology of cells in order to control the microstructure for better mechanical response. In this research, techniques of digital image processing and segmentation in conjunction with mathematical morphology models are used to visualize and analyze the 3D cells of potato. ImageJ and MATLAB are used throughout in this study. The labeled image stacks are essential for studying quantitative characterization of 3D cells, MATLAB is used to label each image stacks. By using MATLAB 12420 cells were segmented within a short period of time and labeled each cell uniquely.

Characterization of Shape Memory and Superelastic Effects by Instrumented Indentation Experiments

2002 ◽  
Vol 750 ◽  
Author(s):  
Wangyang Ni ◽  
Yang-Tse Cheng ◽  
David S. Grummon
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Indentation Depth ◽  
Length Scale ◽  
Recovery Ratio ◽  
Maximum Strain ◽  
Instrumented Indentation ◽  
Quantitative Characterization ◽  
Work Recovery

ABSTRACTThe shape memory and superelastic effects of martensitic and austenitic NiTi alloys were studied by instrumented indentation experiments. The shape memory effect was quantitatively characterized by the thermo-activated depth recovery ratio of the residual indentation depth. The superelasticity of austenitic NiTi was quantitatively characterized by the depth and work recovery ratios obtained from the load-displacement curves. The shape memory and superelastic effects under different indenters (Berkovich, Vickers, and spherical) and loads were rationalized using the concept of the representative strain and maximum strain. This study demonstrates that instrumented indentation techniques are useful in the quantitative characterization of the shape memory and superelastic effects in micro- and nano-meter length scale.

Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading

1989 ◽  
Vol 47 ◽  
pp. 562-563
Author(s):  
Gyeung Ho Kim ◽  
Mehmet Sarikaya ◽  
D. L. Milius ◽  
I. A. Aksay
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Fracture Toughness ◽  
Static Loading ◽  
Carbon Deposition ◽  
Full Density ◽  
Unique Combination ◽  
Strong Component ◽  
Reaction Products

Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.

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