Effect of surface pattern on strength of structural lightweight bonded joints for marine applications

2021 ◽  
pp. 103005
Author(s):  
T. Alderucci ◽  
C. Borsellino ◽  
G. Di Bella
Keyword(s):  
Surface Pattern ◽  
Bonded Joints ◽  
Marine Applications ◽  
Effect Of Surface

scholarly journals Bio-inspired design of ice-retardant devices based on benthic marine invertebrates: the effect of surface texture

2014 ◽  
Author(s):  
Homayun Mehrabani ◽  
Neil Ray ◽  
Kyle Tse ◽  
Dennis Evangelista
Keyword(s):  
Surface Texture ◽  
Marine Invertebrates ◽  
Freezing Point ◽  
Three Dimensional ◽  
Surface Pattern ◽  
Ice Formation ◽  
Cold Air ◽  
Three Dimensional Printing ◽  
Species Specific ◽  
Effect Of Surface

Growth of ice on surfaces poses a challenge for both organisms and for devices that come into contact with liquids below the freezing point. Resistance of some organisms to ice formation and growth, either in subtidal environments (e.g. Antarctic anchor ice), or in environments with moisture and cold air (e.g.vplants, intertidal) begs examination of how this is accomplished. Several factors may be important in promoting or mitigating ice formation. As a start, here we examine the effect of surface texture alone. We tested four candidate surfaces, inspired by hard-shelled marine invertebrates and constructed using a three-dimensional printing process. We screened biological and artifical samples for ice formation and accretion in submerged conditions using previous methods, and developed a new test to examine ice formation from surface droplets as might be encountered in environments with moist, cold air. It appears surface texture plays only a small role in delaying the onset of ice formation: a stripe feature (corresponding to patterning found on valves of blue mussels,Crassostrea gigas, or on the spines of the Antarctic sea urchinSterechinus neumayeri) slowed ice formation an average of 25% compared to a grid feature (corresponding to patterning found on sub-polar butterclams,Saxidomas nuttali). The geometric dimensions of the features have only a small (~6%) effect on ice formation. Surface texture affects ice formation, but does not explain by itself the large variation in ice formation and species-specific ice resistance observed in other work. This suggests future examination of other factors, such as material elastic properties and coatings, and their interaction with surface pattern.

Solid State Bonding of Al Alloy/SUS304 by Metal Salt Generation Bonding Technique with Acetic Acid

2014 ◽  
Vol 922 ◽  
pp. 491-496 ◽  
Author(s):  
Kota Matsubara ◽  
Shinji Koyama ◽  
Hideo Nagata ◽  
Yoshiyuki Suda ◽  
Ikuo Shohji
Keyword(s):  
Acetic Acid ◽  
Surface Modification ◽  
Metal Salt ◽  
Bonding Temperature ◽  
Maximum Load ◽  
Al Alloy ◽  
Bonded Joints ◽  
Modified Surfaces ◽  
Aluminum Surfaces ◽  
Effect Of Surface

The effect of surface modification on the tensile strength of the bonded interface of Al alloy and SUS304 stainless steel was investigated by SEM observations of interfacial microstructures and fractured surfaces. Aluminum surfaces were modified by boiling in 5% aqueous solution of NaOH for 20 s and 99.7% Acetic acid for 60 s. Bonding was performed at bonding temperature of 753 ~ 813 K under a pressure of 6 MPa (bonding time of 1.8 ks). As a result of surface modification, bonded joints were obtained at a bonding temperature 20 K lower than that required for non-modified surfaces, and the bonded strength was comparable to that of the maximum load.

A mixed elastohydrodynamic lubrication model based on virtual rough surface for studying the tribological effect of asperities

2018 ◽  
Vol 70 (2) ◽  
pp. 408-417 ◽  
Author(s):  
Hui Zhang ◽  
Guangneng Dong ◽  
Guozhong Dong
Keyword(s):  
Film Thickness ◽  
Rough Surface ◽  
Current Model ◽  
Elastohydrodynamic Lubrication ◽  
Hydrodynamic Pressure ◽  
Surface Pattern ◽  
Curvature Radius ◽  
Content Type ◽  
Stribeck Curves ◽  
Effect Of Surface

Purpose The main purpose of this paper is to present the effort on developing a mixed elastohydrodynamic lubrication (EHL) model to study the tribological effect of asperities on rough surface. Design/methodology/approach The model, with the use of the average flow Reynolds equation and the K-E elasto-plastic contact model, allows predictions of hydrodynamic pressure and contact pressure on the virtual rough surface, respectively. Then, the substrate elastic deformation is calculated by discrete convolution fast-Fourier transform (DC-FFT) method to modify the film thickness recursively. Afterwards, corresponding ball-on-disk tests are conducted and the validity of the model demonstrated. Moreover, the effects of asperity features, such as roughness, curvature radius and asperity pattern factor, on the tribological properties of EHL, are also discussed though plotting corresponding Stribeck curves and film thickness shapes. Findings It is demonstrated that the current model predicts very close data compared with corresponding experimental results. And it has the advantage of high accuracy comparing with other typical models. Furthermore, smaller roughness, bigger asperity radius and transverse rough surface pattern are found to have lower friction coefficients in mixed EHL models. Originality/value This paper contributes toward developing a mixed EHL model to investigate the effect of surface roughness, which may be helpful to better understand partial EHL.

scholarly journals The effect of surface pattern property on the advancing motion of three-dimensional droplets

2017 ◽  
Vol 22 (11) ◽  
pp. 0-0
Author(s):  
Hua Zhong ◽  
◽  
Xiaolin Fan ◽  
Shuyu Sun ◽  
◽  
...  
Keyword(s):  
Three Dimensional ◽  
Surface Pattern ◽  
Effect Of Surface

Global Stability Behaviour og Single-Layer Reticulated Domes Created Using a New Nomenclature

2021 ◽  
Author(s):  
Ranjith Kolakkattil ◽  
Arul Jayachandran
Keyword(s):  
Physical Meaning ◽  
Load Capacity ◽  
Single Layer ◽  
Primary Objective ◽  
Surface Pattern ◽  
Uniform Loading ◽  
Post Buckling ◽  
Surface Patterns ◽  
Reticulated Domes ◽  
Effect Of Surface

The primary objective of the paper is to investigate the post buckled behaviour of the single-layered Kite geometry dome developed using a novel crystallographic parameterisation principle. Both triangulated and non-triangulated domes are evolved based on the crystallographic parameterisation principles. It brings in a unique nomenclature for identifying different tessellations in reticulated single-layer dome configurations. This nomenclature brings in a physical meaning to dome tessellations instead of being called by the inventors such as Schwedler dome etc. In this paper, the effect of surface pattern on the load capacity of dome configuration is demonstrated with the comparison of domes having different surface patterns. The comparison of post-buckling behaviour of two different single-layer dome configurations - Kiewitt dome and Kite dome is presented. Despite having rigid nodal joints, the load capacity of the dome is significantly reduced when subjected to unsymmetrical and collateral loads due to the localised effect of these loads and the increased chance of snap-through compared to symmetrical uniform loading acting all over the structure. The Kite geometry have higher performance under uniform gravity loading with a low rise to span ratio.

scholarly journals Effect of surface pattern on the adhesive friction of elastomers

2010 ◽  
Vol 82 (3) ◽  
Author(s):  
Fanny Wu-Bavouzet ◽  
Juliette Cayer-Barrioz ◽  
Alain Le Bot ◽  
Françoise Brochard-Wyart ◽  
Axel Buguin
Keyword(s):  
Surface Pattern ◽  
Effect Of Surface
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