scholarly journals Influence of layered structure of composite timber floor boards on their hardness

2019 ◽  
Vol 70 (4) ◽  
pp. 399-406 ◽  
Author(s):  
Piotr Borysiuk ◽  
Izabela Burawska-Kupniewska ◽  
Radosław Auriga ◽  
Grzegorz Kowaluk ◽  
Paweł Kozakiewicz ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Brinell Hardness ◽  
Hardness Measurement ◽  
Layered Composite ◽  
Tangential Section ◽  
Radial Cross Section ◽  
Face Layer ◽  
The Face ◽  
Hardness Values

The possibility of using composite elements of flooring pine veneers with knotholes for the production of supporting layers has been determined. This assessment was made on the basis of the Brinell hardness measurement of the face layer of five-layer composites with empty spots in their structure imitating knotholes of various diameters (10, 20 and 50 mm). The dependencies obtained from empirical determinations were supported by numerical analysis. It was found that it is possible to use veneers with defects (empty spots) with a diameter of up to 20 mm to produce composites of three and more layers of wood (counting from the face layer). The anatomical section of the exposed wood on the face (radial cross-section, tangential section) of the layered composite does not affect the obtained hardness values.

Prediction of Tensile Properties Based on Hardness Measurement

2014 ◽  
Vol 606 ◽  
pp. 35-38 ◽  
Author(s):  
Pavol Zubko ◽  
Ladislav Pešek
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Brinell Hardness ◽  
Hardness Measurement ◽  
Stress Strain ◽  
Hardness Values ◽  
Hollomon Equation ◽  
Good Agreement

The contribution deals with prediction of tensile properties based on measurement of microhardness. First of all, the database of stress strain, s-e vs. hardness data was created. Tensile strength, yield strength, ductility and parameters of Ludwig-Hollomon equation σ = σ0+kεn; k, n were correlated with hardness. Various hardness values found in literature were recalculated to Brinell hardness. In tensile testing measured s-e curves were compared with that obtained from the correlation. The investigated materials were API 5 L grade steels X70 after different deformation exposition. The results give good agreement between compared data. The most difference between estimated and measured curve is in area of yield strength, because of Lüders deformation on investigated steel.

Numerical analysis and design of a new traveling-wave photodetector with an asymmetric I-layer cross section

2003 ◽  
Vol 9 (3) ◽  
pp. 770-775 ◽  
Author(s):  
Soon-Cheol Kong ◽  
Seong-Hae Ok ◽  
Young-Wan Choi ◽  
Joong-Seon Choe ◽  
Yong-Hwan Kwon ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Traveling Wave ◽  
Analysis And Design

Nonlinear numerical analysis of composite foundation with variable cross-section screw compaction piles

2021 ◽  
Author(s):  
Jihui Ding ◽  
Zenghui Yu ◽  
Xuemei Wang ◽  
Shengkang Yan ◽  
Haochen Wang
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Variable Cross Section ◽  
Composite Foundation ◽  
Variable Cross

scholarly journals Comparative Study of Two Nanoindentation Approaches for Assessing Mechanical Properties of Ion-Irradiated Stainless Steel 316

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 719 ◽  
Author(s):  
Michael Saleh ◽  
Zain Zaidi ◽  
Christopher Hurt ◽  
Mihail Ionescu ◽  
Paul Munroe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cross Section ◽  
Ion Irradiation ◽  
Thin Layers ◽  
Experimental Conditions ◽  
Irradiation Energy ◽  
Depth Analysis ◽  
Deformation Processes ◽  
Stainless Steel 316 ◽  
Hardness Values

Nanoindentation is a commonly used method to measure the hardness of surfaces with thin layers, and is especially useful in studying the change in mechanical properties of ion irradiated materials. This research compares two different methods of nanoindentation to study the changes in hardness resulting from ion irradiation of SS316 alloy. The samples were irradiated by He2+ ions at beam energies of 1, 2, and 3 MeV, respectively. The first method involves the indentation of the irradiated surface perpendicular to it using the continuous stiffness mode (CSM), while the second applies the indents on an oblique surface, accessing an inclined cross-section of the irradiated material. Finite element modelling has been used to further illuminate the deformation processes below the indents in the two methods. The hardness profiles obtained from the two nanoindentation methods reveal the differences in the outcomes and advantages of the respective procedures, and provide a useful guideline for their applicability to various experimental conditions. It is shown through an in depth analysis of the results that the ‘top-down’ method is preferable in the case when the ion irradiation energy, or, equivalently, the irradiated depth is small, due to its greater spatial resolution. However, the oblique cross section method is more suitable when the ion irradiation energy is >1 MeV, since it allows a more faithful measurement of hardness as a function of dose, as the plastic field is much smaller and more sensitive to local hardness values.

Numerical analysis of a fiber connected to an inhomogeneous embedded waveguide with rectangular cross-section

2003 ◽  
Vol 40 (1) ◽  
pp. 14-18
Author(s):  
M. Momoda ◽  
T. Miyamoto ◽  
K. Yasumoto
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Rectangular Cross Section

scholarly journals Experimental Assessment of the Depth of the Deformed Layer in the Roller Burnishing Process

2019 ◽  
Vol 290 ◽  
pp. 03008
Author(s):  
Marek Kowalik ◽  
Tomasz Trzepiecinski
Keyword(s):  
Cross Section ◽  
Precise Determination ◽  
Roller Burnishing ◽  
Elastic Zone ◽  
Original Measurement ◽  
The Face ◽  
Burnishing Process ◽  
Deformed Layer ◽  
Slight Deformation

This paper presents the methods of experimental determining the depth of the plastically deformed top layer in the roller burnishing process. Precise determination of the depth of the plastically deformed layer is difficult due to slight deformation at the boundary of the plastic and elastic zone, the lack of visible changes in the microstructure, and minimal changes in microhardness. The article shows the method of original measurement method that consists in determining the thickness of the deformed layer using rings. The method involves the profilographometric measurements of the disconnected rings (samples) which are flat-faced in the package on the mandrel. The rings material deforms plastically in the surface layer causing wrapping of the end face of the ring in the direction of the rolling tool movement. After dismantling the ring pack, measurements were made on the face of each ring along radial directions, and the thickness of the deformed layer was observed on the microscope. The method was verified by microhardness measurements in the cross-section and cross-section of the ring. The results of deformation depth measurements were verified by finite-element-based numerical simulation.

scholarly journals Load carrying capacity of the eccentric joint in the truss made of open cross-sections

2018 ◽  
Vol 219 ◽  
pp. 02002
Author(s):  
Małgorzata Gordziej-Zagórowska ◽  
Elżbieta Urbańska-Galewska
Keyword(s):  
Numerical Analysis ◽  
Cross Section ◽  
Experimental Research ◽  
Cross Sections ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Main Achievement ◽  
Joint Area ◽  
Load Carrying ◽  
Open Cross Section

The influence of eccentricity at intersections of truss members on the load carrying capacity of the truss joint is presented in the paper. The research truss elements were designed as cold-formed open cross section. Analytical calculations, numerical analysis and experimental research were conducted to reveal how the eccentricity affects the effort of material in the joint area. The results of analysis and investigations are compared and discussed. The main achievement of the tests carried out is statement that slender plane members of the compression chords are safe compared with the results of analytical calculations.

Impact Behavior of Rocking Bridge Piers

2002 ◽  
Author(s):  
Chin-Tung Cheng ◽  
Ming-Hsiang Shih
Keyword(s):  
Numerical Analysis ◽  
Kinetic Energy ◽  
Aspect Ratio ◽  
Cross Section ◽  
Bridge Piers ◽  
Impact Behavior ◽  
Restoring Forces ◽  
Numerical Process ◽  
Dissipation Characteristic ◽  
Rocking Behavior

This research aims to investigate the energy dissipation characteristic and impact behavior of rocking piers under free vibration. Research parameters include rocking interfaces (stiff or flexible), geometry of the column cross-section (circular or rectangular), aspect ratio of the columns, anchorage of prestressing tendons and scale effect. To validate the proposed theory, five columns were constructed and will be tested. A numerical process was proposed to simulate the rocking behavior of columns. Numerical analysis revealed that aspect ratio remarkably affects the rocking behavior, however, size effect and shape of cross section had no significant influence on the rocking behavior. Contrary to the instinct, anchored columns may have less damping due to the higher restoring forces that leads to larger acceleration and slower degradation in kinetic energy.

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