End-grain glue-joint strength

1994 ◽  
Vol 52 (6) ◽  
pp. 376-376 ◽  
Author(s):  
J. E. P. Nordström ◽  
S. M. Marelius
Keyword(s):  
Joint Strength ◽  
Glue Joint

Laser Ablation of Machined Wood Surfaces. 2. Effect on End-Grain Gluing of Pine (Pinus silvestris L.)

Holzforschung ◽  
1999 ◽  
Vol 53 (6) ◽  
pp. 655-661 ◽  
Author(s):  
Micael Stehr
Keyword(s):  
Boundary Layer ◽  
Laser Ablation ◽  
Joint Strength ◽  
Statistical Evaluation ◽  
Laser Wavelength ◽  
Pinus Silvestris ◽  
Glue Joint ◽  
Weak Boundary ◽  
Different Types ◽  
Wood Surfaces

Summary The effect on glue joint strength of removing the layer of cells on end-grain surfaces of wood damaged by machining—the mechanical weak boundary layer (MWBL)—is presented. The wood surfaces have been laser ablated using different types of lasers of different wavelengths. The goal has been to determine whether or not the strength of end-grain glue joints is influenced by the MWBL and to show how the laser wavelength affects the glue joint strength. All tests were carried out with a PVAc-glue with hardener, and two different glue pressures were used. The joints were tested by bending notched and fatigued specimens. The statistical evaluation of the results shows that one laser gave a significantly higher glue joint strength than the others. One main conclusion is that the glue joint strength could have been improved with a stronger glue. An ESEM-analysis showed that fracture occurred primarily in the glueline and not in the boundary layer.

End-grain glue-joint strength

1995 ◽  
Vol 53 (1) ◽  
pp. 38-38 ◽  
Author(s):  
J. -E. P. Nordström ◽  
I. Johansson
Keyword(s):  
Joint Strength ◽  
Glue Joint

scholarly journals Some properties of LVL composed of poplar and beech veneer and possibilities of their application for window frames

2017 ◽  
pp. 167-184
Author(s):  
Vladislav Zdravkovic ◽  
Aleksandar Lovric ◽  
Igor Dzincic ◽  
Nemanja Pantovic
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Cross Section ◽  
Joint Strength ◽  
Phenol Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Strength Testing ◽  
Window Frame ◽  
Glue Joint ◽  
The Subject

The subject of this paper was a research of physical and mechanical properties of LVL composed of peeled poplar veneers in core layers and only outer layers of beech peeled veneers, so as the examination of window frame glue joint strength produced of this material. LVL boards have been hot pressed in industrial conditions, using appropriate phenol formaldehyde (PP) adhesive. Samples for corner window frame glue joint strength testing were glued with PVAc D4 class adhesive. Statistical analysis showed that there were significant differences both in moisture content and density of LVL boards regarding their thickness, while in the case of hardness this difference did not exist. Examinations of LVL glue line shear strength showed that both phenol formaldehyde (PP) and PVAc D4 class adhesives fulfilled standard requirements. The results of corner window frame double tenon glue joint strength produced from combined poplar-beech veneer LVL indicated that such material could be used to produce window frame corner joint, strong enough to withstand the additional load, without an increase of the cross section.

Laser Ablation of Machined Wood Surfaces. 1. Effect on End-Grain Gluing of Pine (Pinus silvestris L.) and Spruce (Picea abies Karst.)

Holzforschung ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 93-103 ◽  
Author(s):  
M. Stehr ◽  
J. Seltman ◽  
I. Johansson
Keyword(s):  
Boundary Layer ◽  
Joint Strength ◽  
Statistical Evaluation ◽  
Laser Wavelength ◽  
Environmental Scanning ◽  
Glue Joint ◽  
Weak Boundary ◽  
Electron Microscope Analysis ◽  
Wood Surfaces ◽  
Method Analysis

Summary This report describes two attempts to test the effect of removing the layer of damaged cells—the mechanical weak boundary layer. In both trials, the wood has been laser ablated using different types of lasers with different wavelengths. The goal has been to determine whether the glue joint strength is influenced by the mechanical weak boundary layer and to show how the laser wavelength affects the glue joint strength. The statistical evaluation of the results shows however no great differences between glue joints made of ablated and glue joints made of unablated surfaces. Nor are there any real differences between the different lasers and different wavelengths. This may be because there are indeed no differences between ablated and unablated surfaces, in terms of a mechanical weak boundary layer, but it may also be due to cracks which occurred in the wood specimens, and it is also possible that the glue itself was too weak. An ESEM (Environmental Scanning Electron Microscope)—analysis showed that fracture occurred primarily in the glueline and not in the boundary layer. In addition to the ESEM analysis and the statistical evaluation, a theoretical FEM (Finite Element Method)—analysis has been used to explain the crack initiation in the second trial.

Experimental and FEA Evaluation of Hybrid Joint Strength of Single Lap joint

2011 ◽  
Vol 1 (9) ◽  
pp. 93-96
Author(s):  
S. S. Kadam S. S. Kadam ◽  
◽  
P. A. Dixit P. A. Dixit
Keyword(s):  
Joint Strength ◽  
Lap Joint ◽  
Single Lap Joint ◽  
Hybrid Joint

Influence of Stitching Parameters on the Joint Strength of Welded-Stitched Composites

2018 ◽  
Vol 33 (5) ◽  
pp. 706-713
Author(s):  
L.-M. Wittmann ◽  
T. Kleffel ◽  
T. Mattner ◽  
D. Drummer
Keyword(s):  
Joint Strength

Application of EDS Technique for OSP Film Thickness Measurement

2006 ◽  
Author(s):  
Prong Kongsubto ◽  
Sirarat Kongwudthiti
Keyword(s):  
Thin Film ◽  
Quantitative Analysis ◽  
Joint Strength ◽  
Critical Factor ◽  
Thickness Measurement ◽  
Ic Manufacturing ◽  
And Control ◽  
Film Thickness Measurement ◽  
Non Destructive

Abstract Organic solderability preservatives (OSPs) pad is one of the pad finishing technologies where Cu pad is coated with a thin film of an organic material to protect Cu from oxidation during storage and many processes in IC manufacturing. Thickness of OSP film is a critical factor that we have to consider and control in order to achieve desirable joint strength. Until now, no non-destructive technique has been proposed to measure OSP thickness on substrate. This paper reports about the development of EDS technique for estimating OSP thickness, starting with determination of the EDS parameter followed by establishing the correlation between C/Cu ratio and OSP thickness and, finally, evaluating the accuracy of the EDS technique for OSP thickness measurement. EDS quantitative analysis was proved that it can be utilized for OSP thickness estimation.

Reballing/Rebumping Ultra-Fine Pitch Packages Less Than 0.5 mm Pitch for FA

2014 ◽  
Author(s):  
Bob Wettermann
Keyword(s):  
Solder Joint ◽  
Failure Analysis ◽  
Joint Strength ◽  
Semiconductor Devices ◽  
X Ray ◽  
Fine Pitch ◽  
Manual Methods

Abstract As the pitch and package sizes of semiconductor devices have shrunk and their complexity has increased, the manual methods by which the packages can be re-bumped or reballed for failure analysis have not kept up with this miniaturization. There are some changes in the types of reballing preforms used in these manual methods along with solder excavation techniques required for packages with pitches as fine as 0.3mm. This paper will describe the shortcomings of the previous methods, explain the newer methods and materials and demonstrate their robustness through yield, mechanical solder joint strength and x-ray analysis.

scholarly journals Investigating friction spin welding of thermoplastics in shear joint configuration

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Tarun Bindal ◽  
Ravindra K. Saxena ◽  
Sunil Pandey
Keyword(s):  
Joint Strength ◽  
Rotational Velocity ◽  
Pressure Vessels ◽  
Frictional Heat ◽  
Hydraulic Pressure ◽  
Joint Configuration ◽  
Burst Test ◽  
Shear Joint ◽  
Plastic Parts ◽  
Welding Pressure

AbstractThe welding of thermoplastic pipes under a shear joint configuration using friction spin welding is investigated. The shear joint configuration consists of two cylindrical and concentric polypropylene plastic parts joined with each other at their interfacing cylindrical surfaces through frictional heat generation. The effects of welding pressure and rotational velocity on the joint overlap distance and joint strength between the parts of polypropylene plastic are evaluated. The study is of a specific application in making plastic pressure vessels and joining of pipes. The joint strength is tested by conducting the hydraulic pressure burst test. The burst test is conducted for welded specimens manufactured using different values of rotational velocity and welding pressure. It is observed that at the constant spin velocities, the welding pressure in the range 64.8 to 65.2 kPa produced better joint strength than the other values of welding pressure in the overall range 64–76 kPa. It is concluded that the suitable welding pressure range to manufacture polypropylene plastic pressure vessels in the shear joint configuration using friction spin welding is 64.5 to 65.2 kPa. Further, it is established that the user can control the joint overlap distance at 64.8 kPa welding pressure by selectively controlling the rotational velocity in the range of 700 to 2500 rpm.

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