Evaluation of Elasto-Plastic Stresses Using Birefringent Coating Technique

1997 ◽  
Vol 26 (3) ◽  
pp. 105-115
Author(s):  
K. Ravisankar ◽  
R. Narayanan ◽  
T. Narayanan ◽  
P. Baskaran
Keyword(s):  
Coating Technique ◽  
Birefringent Coating

Analysis of strain in fibre-reinforced materials

1970 ◽  
Vol 5 (4) ◽  
pp. 309-315 ◽  
Author(s):  
K T Kedward ◽  
G R Hindle
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Strain Gauge ◽  
Fibre Composite ◽  
Experimental Results ◽  
Orthotropic Materials ◽  
Displacement Method ◽  
Principal Stresses ◽  
Coating Technique ◽  
Birefringent Coating

Techniques such as birefringent coatings, moiré, brittle lacquers, strain gauge, and holography can all be used on composites since they enable surface strains to be measured. However, a correct and accurate interpretation of results obtained by these methods is essential. The significance of this is demonstrated by observing the effect of the differences between the directions of principal stresses and strains. In addition the suitability of the birefringent-coating technique for application to fibre-composite materials is examined by considering the three-point flexure of a narrow rectangular beam of span/depth ratio 6 in some detail. Within the framework of the assumptions that stresses will be distributed in accordance with elementary bending theory and that the appropriate stress-strain relations for orthotropic materials are applicable, isochromatic and isoclinic patterns are predicted and compared with experimental results. A more precise solution is also obtained by employing the finite-element displacement method. From a qualitative standpoint the comparison is found to be good although more research is required before the birefringent-coating technique can be used in situations demanding a reliable quantitative appreciation.

scholarly journals Development of Adhesive, Bioactive and Antibacterial Titania Sol-Gel Coating on Titanium Substrate by Dip-Coating Technique

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 243
Author(s):  
Diana Horkavcová ◽  
Quentin Doubet ◽  
Gisèle Laure Lecomte-Nana ◽  
Eva Jablonská ◽  
Aleš Helebrant
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sol Gel ◽  
Titanium Substrate ◽  
Dip Coating ◽  
Coating Technique ◽  
Metal Implants ◽  
Excellent Adhesion ◽  
Titania Sol ◽  
Dip Coating Technique

The sol-gel method provides a wide variety of applications in the medical field. One of these applications is the formation of coatings on the metal implants. The coatings containing specific additive can enhance or improve the existing surface properties of the substrate. In this work, titania sol-gel coatings were doped with two forms of silver (AgNO3, Ag3PO4) and synthetic hydroxyapatite and applied on the titanium samples by dip-coating technique. After drying and slow firing, all coatings were characterized with scanning electron microscopy. Thin coatings were successfully prepared with excellent adhesion to the substrate (measured by ASTM D 3359-2), despite cracks. Coatings containing silver and hydroxyapatite demonstrated a 100% antibacterial effect against Escherichia coli after 24 h. The bioactivity of the coatings containing hydroxyapatite tested in modified simulated body fluid under static-dynamic conditions was confirmed by bone-like hydroxyapatite precipitation. To better understand the interaction of the coatings with simulated body fluid (SBF), changes of Ca2+ and (PO4)3− ions concentrations and pH values were studied.

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