Permanent Deformation Response of Polymer-Treated Pavement Foundation Material under Transmitted Stress Pulses

2018 ◽  
Vol 30 (9) ◽  
pp. 04018229
Author(s):  
Romel N. Georgees ◽  
Rayya A. Hassan ◽  
Robert P. Evans
Keyword(s):  
Permanent Deformation ◽  
Deformation Response ◽  
Pavement Foundation

Research on the Relationship Between Surface Engineering and Deformation Response of Some Natural Polymeric Nanofibrous Systems. Possible Applications in Medicine

2017 ◽  
Vol 14 (1) ◽  
pp. 536-544
Author(s):  
Mirela Iorgoaiea Guignard ◽  
Diana Coman ◽  
Maricel Agop ◽  
Noureddine Ouerfelli ◽  
Dan Miricescu ◽  
...  
Keyword(s):  
Surface Engineering ◽  
Permanent Deformation ◽  
Relevant Information ◽  
Antimicrobial Substances ◽  
Deformation Response ◽  
Starting Point ◽  
3D Geometry ◽  
Antimicrobial Performance ◽  
The Relationship ◽  
Polymeric Supports

Since the bamboo derived nanocellulosic fibrous systems (used as covers for mattresses), come in contact with skin, the study is aiming to establish the relationship between their three D-dimensional architecture and permanent deformation. The composite should have a permanent deformation near to zero, in order to be as stable as possible, in terms of dimensional. Different types of bamboo derived nanocellulosic fibrous systems, whose surfaces have been modified/engineered under several irradiation conditions, were used. By analyzing the area of 1 cm2 with UST (Universal Surface Tester), different 3D diagrams were achieved. This type of surface investigation provides relevant information about permanent deformation response of the studied surface, for comfort purposes. In other terms, the roughness which is the parameter quantifying the 3D geometry of the systems surface, a correlation between deformation response and the roughness level could be established. Moreover, since there is a direct contact of this polymeric supports with skin, the outcomes of this research can be regarded as a perspective/starting point for a novel study. The level of roughness can be monitored, in order to obtain matrices with different hydrophobicity, consequently with potential antimicrobial performance. The more hydrophilic the polymeric matrix will be, the more the antimicrobial response/behaviour can be achieved. Some implications in medicine are also considered, because one of the most applied methods to fight infection would be to apply loading onto bamboo derived cellulosic supports that has the capability to release antimicrobial substances.

scholarly journals Correlation between Surface Engineering and Deformation Response of Some Natural Polymer Fibrous Systems

2018 ◽  
Vol 13 (2) ◽  
pp. 155892501801300 ◽  
Author(s):  
Narcisa Vrinceanu ◽  
Mirela Iorgoaiea Guignard ◽  
Christine Campagne ◽  
Stephane Giraud ◽  
Raluca Ioana Prepelita ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Surface Engineering ◽  
Permanent Deformation ◽  
Human Perception ◽  
Relevant Information ◽  
Natural Polymer ◽  
Air Plasma ◽  
Deformation Response ◽  
3D Surface ◽  
Air Plasma Treatment

Surfaces of bamboo derived cellulosic fibrous systems have been modified by air-plasma treatment. Their deformational response was studied to establish the relationship between their three-dimensional profile and permanent deformation as a measure of their comfort properties since the fibrous system made of natural polymer comes into contact with the skin. The composite should have a permanent deformation close to zero, in order to be, in terms of dimensions, as stable as possible. By analyzing the area of 1 cm2 using a Universal Surface Tester (UST), different 3D surface diagrams and surface roughness values were obtained. This type of surface investigation provides relevant information about the permanent deformation response of the studied surface, for comfort purposes. The deformation responses and roughness levels were studied (the roughness being the parameter quantifying the 3D geometry of the systems surface). The effect of air-plasma surface modification on the deformation response of bamboo derived cellulosic fibrous systems and optimization of their 3D surface structure to enhance comfort-related properties proved to be substantial. The surface modifications induced by air-plasma treatment are in a good correlation with the mechanical behavior. As expected, the roughness levels of samples studied using ball sensors are higher than those of specimens scanned using a papillary sensor. Knitted polymer fibrous matrix T1 shows a roughness level of 773 μm resulting from analyses using the ball sensor, while using the papillary sensor it was 102 μm, 86.8% less than before. The analysis of the dimensional stability of knitted polymer fibrous systems was performed by scanning with the papillary sensor, since it provides information comparable with human perception concerning the architecture of the sample surfaces.

Permanent Deformation of Steel under Slowly Repeated Load

1954 ◽  
Vol 3 (15) ◽  
pp. 314-317
Author(s):  
Minoru KAWAMOTO ◽  
Tadakazu SAKURAI ◽  
Morio SEKI
Keyword(s):  
Permanent Deformation ◽  
Repeated Load
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