scholarly journals Effect of Artificial Ageing on Adhesive Bonds from Heat Treated Spruce

2021 ◽  
Vol 72 (4) ◽  
pp. 381-388
Author(s):  
Mirko Kariz ◽  
Manja Kitek Kuzman ◽  
Milan Šernek
Keyword(s):  
Bond Strength ◽  
Colour Change ◽  
Adhesive Bond ◽  
Artificial Ageing ◽  
Bonded Joints ◽  
Average Strength ◽  
Ir Radiation ◽  
Adhesive Bonds ◽  
Artificial Weathering ◽  
Heat Treated

The influence of artificial ageing on bonded heat-treated spruce lamellas was investigated. Heat-treated spruce lamellas with different degrees of thermal modification were bonded with PVAc and MUF and then exposed to 500 artificial weathering cycles, combined with rain, UV and IR radiation. The colour change of the exposed surface, weight change, delamination of the bonded joints and adhesive bond strength were measured. Artificial weathering caused cracking and delamination of the bonded joints and reduced the bond strength of both adhesives. The results show that delamination was higher for PVAc adhesive than MUF, but increased for both adhesives with the temperature of heat treatment of wood. The shear strength of bonds on the exposed side of the samples after the artificial weathering was lower than the average strength of the whole sample.

Influence of Environment Temperature on Strength of Quick-Setting Adhesives Based on Cyanoacrylates

2014 ◽  
Vol 1030-1032 ◽  
pp. 272-275
Author(s):  
Miroslav Müller ◽  
Petr Valášek
Keyword(s):  
Bond Strength ◽  
Production Process ◽  
Temperature Fluctuations ◽  
Adhesive Bond ◽  
Negative Influence ◽  
Temperature Influence ◽  
Adhesive Bonds ◽  
Strength Change ◽  
Environment Temperature ◽  
Adhesive Bond Strength

A primary aim of a manufacturing company is a simplicity and a speed of a production process. This assumption makes prospects in an area of sheet bonding by quik-setting adhesives (cyanoacrylates). Owing to temperature fluctuations in various climatic environments significant changes of the temperature occur. For successful application of particular products it is necessary to investigate a temperature dependence of already hardened adhesives. The paper deals with a research of the environment temperature influence on the strength change of the quick-setting adhesives. The experiment results confirmed a fundamental negative influence of the environment temperature on the strength of the adhesive bonds. A type of the failure area has not change owing to the environment temperature. The aim of the research is to set the influence of the environment temperature on the adhesive bond strength created with different cyanoacrylate adhesives.

scholarly journals Technological and constructional aspects affecting bonded joints

2008 ◽  
Vol 53 (No. 2) ◽  
pp. 67-74 ◽  
Author(s):  
M. Müller ◽  
R. Chotěborský ◽  
J. Krmela
Keyword(s):  
Bond Strength ◽  
Laboratory Experiments ◽  
Adhesive Bonding ◽  
Adhesive Bond ◽  
Bonded Joints ◽  
Metallic Materials ◽  
Very Old ◽  
Number Of Factors ◽  
Bonding Technology ◽  
Adhesive Bond Strength

Adhesive bonding is one of many materials connecting methods. In the last ten years periods the bonding technology noted a boom almost in all industrial branches. The use of bonding technology in the engineering and repairing industry brings considerable savings. Saving in costs, in critical metallic materials and in time are reached and the decrease of the joint weight, too. Therefore the bonding technology pertains to the modern jointing methods even though it is a very old technique. The adhesive bonding technology is influenced by a number of factors which affect the adhesive bond strength. Correcting coefficients have to be considered in construction calculations too. The correcting coefficients correct the strength deviations caused by particular factors. In the paper there are published laboratory experiments results.

scholarly journals Influence of loading speed on a change of parameters of adhesive bonds based on cyanoacrylates

2016 ◽  
Vol 61 (No. 4) ◽  
pp. 177-182 ◽  
Author(s):  
M. Müller
Keyword(s):  
Bond Strength ◽  
Bearing Capacity ◽  
Failure Time ◽  
Adhesive Bond ◽  
Adhesive Bonds ◽  
Hardening Process ◽  
Technical Practice ◽  
Adhesive Bond Strength

The paper deals with a behaviour of adhesive bonds created by means of quick-setting adhesives at different speeds of a loading. The aim of the research was to simulate a change of a bearing capacity of the adhesive bond at marginal limits foregoing the bond destruction. Application of quick–setting adhesives based on cyanoacrylates is considerably spread in a technical practice. Its advantage is speed of a hardening process. A fast creation of a bond and a possibility of fast manipulation with the adhesive bond are connected with it. The manipulation strength of the adhesive bond is reached in a few seconds. The aim of the research is to describe behaviour of quick–setting adhesives based on cyanoacrylates at different speeds of loading of the adhesive bonds in an interval of 1 to 600 mm/min. A change of the adhesive bond strength, an elongation and a failure time were evaluated within the experiments. Also the behaviour of the adhesive bonded material was observed within the research.

Adhesive bond strength between orthodontic resin and acrylic surfaces

2020 ◽  
pp. 1-5
Author(s):  
Evelyn Guadalupe Torres-Capetillo ◽  
Guadalupe Rosalía Capetillo-Hernández ◽  
Laura Roesch-Ramos ◽  
Flora Moreno-Marín
Keyword(s):  
Bond Strength ◽  
Adhesive Bonding ◽  
Statistical Processing ◽  
Adhesive Bond ◽  
Diamond Bur ◽  
Fine Diamond ◽  
Adhesive Bond Strength ◽  
Application Protocols ◽  
Made In

The use of orthodontic treatments in patients with temporary prostheses has been increasing, the purpose of this in vitro research is to measure the adhesive bond strength between orthodontic resin and acrylic surfaces by applying different procedures. Objective. To compare the adhesive bonding strength between orthodontic resin and acrylic surfaces under different application protocols. Methodology. Transversal, experimental, prospective study. In vitro with acrylic provisions, was carried out in the laboratory of the Faculty of Dentistry of the Universidad Veracruzana region of Veracruz. In the period of February-June of the year 2019. The sample was conformed by two control groups of specimens and four experimental ones, each group conformed by 20 specimens, in total 120 provisional ones were made in acrylic Nic Tone of quick self-cure. The tests performed by the ULTRATESTER machine were expressed in MPa. Later, the data obtained were processed in Excel tables (version) for statistical processing in SPSS version 24. Contribution. When comparing the pre-cutting protocol of acrylic surfaces with fine diamond bur and the protocol without pre-cutting, no statistically significant differences were found, therefore, this step could be omitted in clinical practice.

NON-DESTRUCTIVE EVALUATION OF MECHANICAL DAMAGE OF ADHESIVES USING MAGNETO-ELECTRIC NANOPARTICLES

2021 ◽  
Author(s):  
GONZALO SEISDEDOS ◽  
BRIAN HERNANDEZ ◽  
JULIETTE DUBON ◽  
MARIANA ONTIVEROS ◽  
BENJAMIN BOESL ◽  
...  
Keyword(s):  
Adhesive Joint ◽  
Adhesive Bonding ◽  
Mechanical Damage ◽  
Adhesive Bond ◽  
Tensile Tests ◽  
Adhesive Joints ◽  
Adhesive Bonds ◽  
Magnetic Signatures ◽  
Looper System ◽  
Lock In

Adhesive bonding has been shown to successfully address some of the main problems with traditional fasteners, such as the reduction of the overall weight and a more uniformly distributed stress state. However, due to the unpredictability of failure of adhesive bonds, their use is not widely accepted in the aerospace industry. Unlike traditional fastening methods, it is difficult to inspect the health of an adhesive joint once it has been cured. For adhesive bonding to be widely accepted and implemented, there must be a better understanding of the fracture mechanism of the adhesive joints, as well as a way to monitor the health of the bonds nondestructively. Therefore, in-field structural health monitoring is an important tool to ensure optimal condition of the bond is present during its lifetime. This project focuses on the advancement of a non-invasive field instrument for evaluation of the health of the adhesive joints. The tool developed is based on a B-H looper system where coils are arranged into a noise-cancellation configuration to measure the magnetic susceptibility of the samples with a lock-in amplifier. The B-H looper system can evaluate the state of damage in an adhesive bond by detecting changes in surface charge density at the molecular level of an epoxy-based adhesive doped with magneto-electric nanoparticles (MENs). Epoxy-based adhesive samples were doped with MENs and then scanned using the B-H looper system. To evaluate the health of the adhesive joint, microindentation and tensile tests were performed on MENs-doped adhesive samples to understand the relationship between mechanical damage and magnetic signal. Correlations between magnetic signatures and mechanical damage were minimally observed, thus future studies will focus on refining the procedure and damaging methodology.

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