20303 Strength Evaluation of Adhesively Wavy-lap Joints with Dissimilar Adherends under Tensile Shear Load

2015 ◽  
Vol 2015.21 (0) ◽  
pp. _20303-1_-_20303-2_
Author(s):  
Anzu SHOYAMA ◽  
Jyo SHIMURA ◽  
Takeharu HAYASHI ◽  
Shigeru KUROSAKI
Keyword(s):  
Lap Joints ◽  
Shear Load ◽  
Tensile Shear ◽  
Strength Evaluation

Improving the Tensile Shear Load of Al–Mg–Si Alloy FSLW Joint by BPNN–GA

2021 ◽  
Author(s):  
Ruixiu Guo ◽  
Wei Hu ◽  
Qi Song ◽  
Shude Ji ◽  
Weiwei Qi ◽  
...  
Keyword(s):  
Shear Load ◽  
Tensile Shear

Tensile shear strength of UF- and MUF-bonded veneer related to data of adhesives and cell walls measured by nanoindentation

Holzforschung ◽  
2010 ◽  
Vol 64 (3) ◽  
Author(s):  
Frank Stöckel ◽  
Johannes Konnerth ◽  
Wolfgang Kantner ◽  
Johann Moser ◽  
Wolfgang Gindl
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Bond Strength ◽  
Cell Walls ◽  
Urea Formaldehyde ◽  
Lap Joints ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Interphase Cell ◽  
Cure Time

Abstract The tensile shear strength of veneer lap joints was characterised. The joints were produced with an Automated Bonding Evaluation System (ABES) using urea-formaldehyde (UF) as well as melamine-urea-formaldehyde (MUF) adhesive formulated for particleboard production. At a fixed heating temperature of 110°C, a systematic increase in bond strength was observed for both adhesives with increasing cure time. The absolute bond strength was significantly higher for MUF compared to UF. Nanoindentation experiments with the same specimens used for ABES revealed a very hard, stiff and brittle character of the UF resin, whereas the MUF proved significantly less hard and stiff, and less brit-tle. Wood cell walls in contact with adhesive, i.e., where adhesive penetration into the cell wall was assumed, showed significantly altered mechanical properties. Such cell walls were harder, stiffer and more brittle than unaffected reference cell walls. These effects were slightly more pronounced for UF than for MUF. Comparing UF and MUF, the micro-mechanical properties of cured adhesive and interphase cell walls confirm earlier observations that tougher adhesives can lead to higher macroscopic bond strength. In strong contrast to that, no obvious correlation was found between micromechanical properties and the strong cure time dependence of macroscopic bond strength.

scholarly journals Influence of Welding Speed on Characteristics of Non-Axisymmetric Laser-Tungsten Inert Gas Hybrid Welded Mg/Al Lap Joints with Zn Filler

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3789
Author(s):  
Xinze Lv ◽  
Hongyang Wang ◽  
Liming Liu
Keyword(s):  
Solid Solution ◽  
Intermetallic Compounds ◽  
Welding Speed ◽  
Solidification Rate ◽  
Eutectic Structure ◽  
Lap Joints ◽  
Inert Gas ◽  
Heat Sources ◽  
Base Metals ◽  
Tensile Shear

A non-axisymmetric laser-tungsten inert gas (TIG) heat source was designed to join Mg–Al dissimilar metals with pure Zn filler at a series of welding speeds (500–900 mm/min). Laser and TIG heat sources respectively acted on Al and Mg base metals to precisely control their dissolution into the welding pool. The solidification rate of liquid metal was controlled by adjusting the welding speed, then the reaction process of Mg, Al and Zn could be accurately regulated. The results indicated that various microstructures including Al solid solution, Zn solid solution, Mg–Zn intermetallic compounds (IMCs) and eutectic structure formed in the joint produced at different speeds. Lower welding speed (500 mm/min) caused the microstructure coarsening and higher welding speed (900 mm/min) would lead to the enrichment of MgZn2 intermetallic compounds. At the optimal welding speed of 800 mm/min in particular, fine MgZn2 IMCs grains uniformly distributed in the Al and Zn solid solution. The tensile-shear load reached a maximum of 1052.5 N/cm and the joint fractured at the fusion zone near the Al base metal.

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