scholarly journals Characterization of the Microstructure and Surface Roughness Effects on Fatigue Life Using the Tanaka–Mura–Wu Model

2021 ◽  
Vol 11 (21) ◽  
pp. 9955
Author(s):  
Xijia Wu ◽  
Philippe Kanz ◽  
Hassan Mahmoud ◽  
Jason Millar ◽  
Peyman Shabani ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Structural Design ◽  
Limiting Factors ◽  
Fatigue Properties ◽  
Roughness Effects ◽  
Statistical Characterization ◽  
Fatigue Design ◽  
Structural Applications ◽  
Microstructural Effect

Additive manufacturing (AM) has drawn tremendous interest in engineering applications because it offers almost unlimited possibilities of innovative structural design to save weight and optimize performance. However, fatigue properties are one of the limiting factors for structural applications of AM materials. The recently developed Tanaka–Mura–Wu (TMW) model is modified to include the microstructure and surface roughness factors, in addition to the material’s elastic modulus, surface energy and Burgers vector, to predict the fatigue curves as functions of stress or plastic strain for several typical AM materials as well as their conventional (wrought) counterpart. Furthermore, with statistical characterization of the microstructural effect, the model can be established to evaluate fatigue design allowables.

Serviceability Characterization of Composite Storage Tanks

2007 ◽  
Author(s):  
Vladimir M. Shkolnikov
Keyword(s):  
Structural Design ◽  
Design Procedure ◽  
Fatigue Properties ◽  
Storage Tanks ◽  
Safety Factors ◽  
Analytical Technique ◽  
Term Operation ◽  
Temperature Exposure

This paper outlines an analytical technique enabling serviceability characterization of a storage tank made of a Polymer Matrix Composite (PMC) with regards to a specified profile of long-term operation of the tank. The technique combines force-temperature exposure (conceivably changing over a tank’s service life) and fatigue properties of a composite utilized within the tank structure. Along with a serviceability assessment, the technique is capable of providing a well-grounded specification of design knock-downs and safety factors relevant to the conventional structural design procedure.

scholarly journals Characterization of surface roughness effects on pressure drop in single-phase flow in minichannels

2005 ◽  
Vol 17 (10) ◽  
pp. 100606 ◽  
Author(s):  
Satish G. Kandlikar ◽  
Derek Schmitt ◽  
Andres L. Carrano ◽  
James B. Taylor
Keyword(s):  
Surface Roughness ◽  
Pressure Drop ◽  
Single Phase ◽  
Phase Flow ◽  
Single Phase Flow ◽  
Roughness Effects

Characterization of Surface Roughness Effects on Laminar Flow in Microchannels by Using Fractal Cantor Structures

2009 ◽  
Author(s):  
Chengbin Zhang ◽  
Yongping Chen ◽  
Panpan Fu ◽  
Mingheng Shi
Keyword(s):  
Surface Roughness ◽  
Reynolds Number ◽  
Fractal Dimension ◽  
Pressure Drop ◽  
Laminar Flow ◽  
Flow Direction ◽  
Roughness Effects ◽  
Relative Roughness ◽  
Smooth Channel

The fractal characterization of the topography of rough surfaces by using Cantor set structures is introduced in this paper. Based on the fractal Cantor surface, a model of laminar flow in rough microchannels is developed and numerically analyzed to study the characterization of surface roughness effects on laminar flow. The effects of Reynolds number, relative roughness, and fractal dimension on laminar flow are all discussed. The results indicate that the presence of roughness leads to the form of the detachment, and eddy generation is observed at the shadow of the roughness elements. The pressure drop in the rough channel along the flow direction is no longer in a linear fashion and larger than that in the smooth channel. The fluctuation characteristic of pressure drop along the stream, which is due to the vortex formation at the wall, is found. Differing from the smooth channel, the Poiseuille number for laminar flow in rough microchannels is no longer only dependent on the cross-sectional shape of the channel, but also strongly influenced by the Reynolds number, relative roughness and fractal dimension of the surface.

Characterization of Soil Surface Roughness Effects on Runoff and Soil Erosion Rates under Simulated Rainfall

2015 ◽  
Vol 79 (3) ◽  
pp. 903-916 ◽  
Author(s):  
J. Vermang ◽  
L.D. Norton ◽  
C. Huang ◽  
W.M. Cornelis ◽  
A.M. da Silva ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Soil Erosion ◽  
Soil Surface ◽  
Simulated Rainfall ◽  
Roughness Effects ◽  
Erosion Rates ◽  
Soil Erosion Rates ◽  
Soil Surface Roughness

Characterization of Multilayers as X-Ray Dispersion Devices

1987 ◽  
Vol 103 ◽  
Author(s):  
John V. Gilfrich ◽  
Dennis B. Brown ◽  
David L. Rosen ◽  
Ralph K. Freitag
Keyword(s):  
Surface Roughness ◽  
Theoretical Calculations ◽  
Perfect Crystal ◽  
Resolving Power ◽  
Roughness Effects ◽  
Double Crystal ◽  
X Ray ◽  
Diffraction Model ◽  
Conventional Models

ABSTRACTThe appropriate application of multilayers as x-ray dispersion devices requires that their diffraction characteristics be understood. Conventional models, based on perfect-crystal and mosaic-crystal theories, predict diffraction efficiencies (integral reflection coefficients) significantly larger than values measured experimentally. It has been shown that introduction of surface roughness effects into the model can promote agreement between experimental and theoretical values, while the presence of other types of defects produce changes too small in magnitude to explain the discrepancy. Because it is reasonably well agreed that the resolving power of multilayers is only moderate, compared to the more conventional “crystal” dispersing devices, it is important to be able to predict or measure that parameter in order to assess the usefulness for a particular application. Experimental measurements and theoretical calculations have been carried out on multilayers (almost exclusively tungsten/carbon) prepared to have 2d-spacings from 50 to 140A. The experimental work used both singlecrystal and double-crystal spectrometers; the calculations used the crystal diffraction model, as modified to include surface roughness.

An Experimental Study of Surface Roughness Effects on Turbulent Boundary Layer Flow and Heat Transfer

1989 ◽  
Author(s):  
Hugh W. Coleman ◽  
Robert P. Taylor ◽  
M. H. Hosni ◽  
Glenn B. Brown ◽  
Philip H. Love
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Experimental Study ◽  
Surface Roughness ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Flow ◽  
Roughness Effects ◽  
Flow And Heat Transfer ◽  
Turbulent Boundary Layer Flow ◽  
Layer Flow
Sign in / Sign up

Export Citation Format

Share Document