scholarly journals Interlaboratory Study of Ice Adhesion Using Different Techniques

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 678 ◽  
Author(s):  
Sigrid Rønneberg ◽  
Yizhi Zhuo ◽  
Caroline Laforte ◽  
Jianying He ◽  
Zhiliang Zhang
Keyword(s):  
Adhesion Strength ◽  
Shear Test ◽  
Bulk Water ◽  
Test Methods ◽  
Test Method ◽  
Vertical Shear ◽  
Adhesion Test ◽  
Water Ice ◽  
Key Parameter ◽  
Ice Adhesion

Low ice adhesion surfaces are a promising anti-icing strategy. However, reported ice adhesion strengths cannot be directly compared between research groups. This study compares results obtained from testing the ice adhesion strength on two types of surfaces at two different laboratories, testing two different types of ice with different ice adhesion test methods at temperatures of −10 and −18 °C. One laboratory used the centrifuge adhesion test and tested precipitation ice and bulk water ice, while the other laboratory used a vertical shear test and tested only bulk water ice. The surfaces tested were bare aluminum and a commercial icephobic coating, with all samples prepared in the same manner. The results showed comparability in the general trends, surprisingly, with the greatest differences for bare aluminum surfaces at −10 °C. For bulk water ice, the vertical shear test resulted in systematically higher ice adhesion strength than the centrifugal adhesion test. The standard deviation depends on the surface type and seems to scale with the absolute value of the ice adhesion strength. The experiments capture the overall trends in which the ice adhesion strength surprisingly decreases from −10 to −18 °C for aluminum and is almost independent of temperature for a commercial icephobic coating. In addition, the study captures similar trends in the effect of ice type on ice adhesion strength as previously reported and substantiates that ice formation is a key parameter for ice adhesion mechanisms. Repeatability should be considered a key parameter in determining the ideal ice adhesion test method.

Tensile and Shear Test Methods for Quantifying the Ice Adhesion Strength to a Surface

Ice Adhesion ◽  
2020 ◽  
pp. 237-284
Author(s):  
Alexandre Laroche ◽  
Maria Jose Grasso ◽  
Ali Dolatabadi ◽  
Elmar Bonaccurso
Keyword(s):  
Adhesion Strength ◽  
Shear Test ◽  
Test Methods ◽  
Ice Adhesion

Diaphragm Vulcanized Adhesion Test Method

1965 ◽  
Vol 38 (4) ◽  
pp. 791-801 ◽  
Author(s):  
C. E. Taylor
Keyword(s):  
Chemical Bonding ◽  
Test Methods ◽  
Test Method ◽  
Adhesion Test ◽  
Basic Principles ◽  
Mechanical Adhesion ◽  
Manufacturing Methods ◽  
Rubber Product ◽  
Laboratory Time ◽  
Equal Effectiveness

Abstract By using a rubber diaphragm as pressure transmitting medium, a cured adhesion test method has been developed which permits controllable curing pressures to be employed. The quest for a new adhesion test method was occasioned by lack of confidence in existing test methods with respect to reproducibility and correlation between testing sites. The diaphragm cures “hi place” with a minimum of rubber movement as compared to excessive press pressures which induce flow. Controllable vulcanizing pressures and temperatures permit accurate adhesion evaluation of individual components in the laboratory under conditions which closely approximate manufacturing methods. A prime goal has been evaluation of true chemical bonding and elimination of all possible mechanical adhesion contributions inherent in most rubber-product fabrications. The diaphragm pressure adhesion test can be used by Quality Control, Development, or Research Department as an accurate tool to evaluate the chemical adhesion potential of rubber and common reinforcing components. Since adhesion values are machine recorded, all laboratory time and error in tabulations and calculations are eliminated. Basic principles of the technique permit evaluation of chemical bonding of rubber to yarns, fibers, and cords with equal effectiveness.

Hot Pin Pull Method – New Test Procedure for the Adhesion Measurement for 3D-MID

2014 ◽  
Vol 1038 ◽  
pp. 115-120 ◽  
Author(s):  
Christian Goth ◽  
Thomas Kuhn ◽  
Gerald Gion ◽  
Jörg Franke
Keyword(s):  
Test Procedure ◽  
Test Methods ◽  
Test Method ◽  
Testing System ◽  
Adhesion Test ◽  
Metallic Structures ◽  
Adhesion Measurement ◽  
Molded Interconnect Devices ◽  
Unsolved Issue

The adhesion test of metallic structures on MID (Molded Interconnect Devices) parts is an unsolved issue. So far no method really works reliably. The test methods which are conventionally used are the pull-off test and the shear-test. Both show large standard deviation and the reproducibility is not assured. Nordson DAGE has introduced the new micro-material testing system 4000Plus. This device enables a new test method for the determination of the adhesion strength of MID structures using the hot pin pull (hot bump pull) method. Copper pins (tinned or untinned) are heated up with a user defined temperature profile, soldered to a metallized structure on the MID and then removed vertically upward, while the force is recorded. In this contribution investigations with this new test method are presented.

scholarly journals Use of Fall Cone Test for the determination of undrained shear strength of cohesive soils

2018 ◽  
Vol 251 ◽  
pp. 04067
Author(s):  
Diogo Canelas ◽  
Isabel Fernandes ◽  
Maria da Graça Lopes
Keyword(s):  
Shear Strength ◽  
Direct Shear Test ◽  
Shear Test ◽  
Undrained Shear Strength ◽  
Test Methods ◽  
Liquid Limit ◽  
Test Method ◽  
Cohesive Soils ◽  
Undrained Shear

CT156, Geotechnics and civil engineering, has been developing efforts to create standards with the generic designation EN ISO 17892, Geotechnical investigation and testing - Laboratory testing of soil. The recent publication of EN ISO 17892-part 6, Fall Cone Test which describes in detail the use of this test method to estimate the undrained shear strength of cohesive soils leads to the necessity for the laboratories to get familiar with this test method and to acquire the required sensibility to analyse the results obtained. Originally designed to determine the liquid limit of fine soils, for which purpose it is considered as an accurate substitute of the Casagrande method, the method may constitute an alternative to the direct shear test, which takes certainly longer time to be carried out and is more complex. The present work aims to compare the values for liquid limit obtained with the Casagrande's method and the cone method and as well as the use of this test to estimate undrained shear strength, correlating with results from other laboratory tests such as the Direct Shear Test and the Laboratory Vane Test on remoulded samples. The results obtained show that there is a good correlation between the applied test methods for determination of the liquid limit and that, for some water contents, the results obtained by the three test methods are comparable.

Progress on Measurement of Adhesion Strength of Marine Microfouling Organisms

2011 ◽  
Vol 299-300 ◽  
pp. 883-886 ◽  
Author(s):  
Juan Zhou ◽  
Cun Guo Lin ◽  
Dong Xia Duan
Keyword(s):  
Adhesion Strength ◽  
Flow Cell ◽  
Flow Chamber ◽  
Test Methods ◽  
Test Method ◽  
Material Surface ◽  
Surface Adhesion ◽  
Biological Adhesion ◽  
Laminar Channel Flow ◽  
Antifouling Ability

The development of novel nontoxic antifouling paint has led to the need for better test methods to evaluate their performance. The adhesion strength of microorganism on material surface is the key parameter to characterize whether they could permanently soiled, therefore it is significant to establish a biological adhesion test method to evaluate the material antifouling ability. In this paper, several types of surface adhesion strength test devices have been introduced, including spinet apparatus, laminar channel flow cell, radial flow chamber, annular flow cell and fully-developed turbulent channel. Their application, advantage and disadvantage have also been discussed.

scholarly journals Anti-Icing Performance of a Coating Based on Nano/Microsilica Particle-Filled Amino-Terminated PDMS-Modified Epoxy

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 771 ◽  
Author(s):  
Qiang Xie ◽  
Tianhui Hao ◽  
Jifeng Zhang ◽  
Chao Wang ◽  
Rongkui Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Adhesion Strength ◽  
Photoelectron Spectroscopy ◽  
Contact Angle Hysteresis ◽  
Ice Formation ◽  
Adhesion Test ◽  
X Ray ◽  
Modified Epoxy ◽  
Scanning Electron ◽  
Ice Adhesion

Coatings with anti-icing performance possess hydrophobicity and low ice adhesion strength, which delay ice formation and make ice removal easier. In this paper, the anti-icing performance of nano/microsilica particle-filled amino-terminated PDMS (A-PDMS)-modified epoxy coatings was investigated. In the process, the influence of the addition of A-PDMS on the hydrophobicity and ice adhesion strength was investigated. Furthermore, the influences of various weight ratios of nanosilica/microsilica (Rn/m) on the hydrophobicity and ice adhesion strength of the coating were investigated. Hydrophobicity was evaluated by contact angle (CA) and contact angle hysteresis (CAH) tests. Ice adhesion strength was measured by a centrifugal adhesion test. The addition of A-PDMS markedly increased hydrophobicity and decreased ice adhesion. The size combination of particles obviously affects hydrophobicity but has little effect on ice adhesion. Finally, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to reveal the anti-icing mechanism of the coatings.

An in vitro bone-to-bone adhesion test method using the compression shear test

2021 ◽  
Vol 111 ◽  
pp. 102977
Author(s):  
Vanessa Lührs ◽  
Sebastian Stößlein ◽  
Karsten Thiel ◽  
Ingo Grunwald ◽  
Andreas Hartwig
Keyword(s):  
Shear Test ◽  
Test Method ◽  
Adhesion Test

scholarly journals Strength and Interface Adhesion Properties of in-Plane Shear Loaded Thick Adhesive Joint

2018 ◽  
Vol 7 (2.29) ◽  
pp. 947
Author(s):  
Hafizah Muhamad Azlan ◽  
Lannie Francis ◽  
Zakiah Ahmad
Keyword(s):  
Shear Test ◽  
Test Methods ◽  
Test Method ◽  
Plane Shear ◽  
Adhesion Properties ◽  
Lap Shear ◽  
Lap Shear Test ◽  
Absolute Test ◽  
Shear Performance

This paper addresses the quality of the interface bonded joints in layers of timber elements. The shear performance was studied to assess the suitability of adhesive to bond timber with different thickness of glueline and timber densities. Since there is absolute test method in establishing  the shear strength of the surface bonds between layers timber elements, two test methods were used namely Thick Adherend Shear Test [TAST] and Lap Shear Test. The adhesived used is Sikadur-30 and timber used are Sesendok, Bintangor and Kempas with average densities 400-600kg/m3, 600-800kg/m3 and 800-1000kg/m3 respectively. Obtained results suggest that the interface stress distribution are related to the thicknesses of adhesive and densities of timber.  

Ice Shear Adhesion Test Methods Review and New In Situ Test Method

2021 ◽  
Author(s):  
Edem Y. Tetteh ◽  
Michael W. Jeong ◽  
Eric Loth
Keyword(s):  
Test Methods ◽  
Test Method ◽  
Adhesion Test ◽  
In Situ Test

scholarly journals Comparative Study on Torsional Shear and Triaxial Test of Asphalt Mixtures

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Xie ◽  
Yifan Wang
Keyword(s):  
Internal Friction ◽  
Comparative Study ◽  
Triaxial Test ◽  
Shear Test ◽  
Friction Angle ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Test Method ◽  
Torsional Shear ◽  
Torsional Test

In order to verify the reliability and effectiveness of the torsional shear test method, a comparative study of the torsional test under normal stress conditions and triaxial test was carried out with two different asphalt types (unmodified asphalt and SBS-modified asphalt) for asphalt mixtures of AC-13 and AC-20 at three temperatures of 20°C, 40°C, and 60°C. The results showed that the crack spreading routine and the spreading angle were different between the two test methods. The cohesion of the torsional test was slightly larger than that of the triaxial test for different mixtures, asphalts, and temperatures. The main cause of this result is the difference of loading mode. The internal friction angle was basically equivalent in the two methods for different mixtures, asphalts, and temperatures, which indicated that the internal friction angle was mainly related to the spatial distribution of the aggregates or the mutual interlock and had little to do with the test method and external conditions. The results of the ANOVA and regression analysis indicated that the two test methods have a good correlation, and the torsional shear test is a reliable and effective laboratory test method for evaluating the shear performance of asphalt mixtures.

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