Effects of Shape and Bond Strength on Adhesive Failure of Joint Sealants

2020 ◽  
pp. 036119812096209
Author(s):  
Jinho Kim ◽  
Dan Zollinger
Keyword(s):  
Finite Element Method ◽  
Bond Strength ◽  
Shape Factor ◽  
Joint Strength ◽  
The Finite Element Method ◽  
Adhesive Failure ◽  
Design Factor ◽  
Joint Preparation ◽  
The Face ◽  
Bond Tests

Currently, joint sealant is designed without consideration of the bond strength between the concrete and the sealant and the effect of shape on stress concentration. This often leads to adhesive failures within 1.5 years, earlier than the expected service life of the joint sealant, which is 20 years. In adhesive failure, the strength of the bond and the stress of the interface between the sealant and the face of the joint reservoir play a very important role. To examine the nature of the bond along the sealant/joint well interface, experimental bond tests were conducted. In addition, the stress distribution on the interface was also investigated according to geometry (Shape Factor [SF] and degree of curvature [DoC]). Re-evaluation of the SF was conducted, and a new design factor, DoC, was introduced and investigated through the finite element method of analysis. With these factors, the reduction of bond strength and increase in the stress at the interface can be limited reducing the potential for early adhesive failure. Based on this study, the effect of joint preparation (dirt and moisture) on joint strength and shape (SF and DoC) of joint sealant should be considered when designing and installing sealants.

The Influence of Tangential Roller Pressure on the Stability of Circular Saw Blade

2014 ◽  
Vol 614 ◽  
pp. 32-35 ◽  
Author(s):  
Ming Song Zhang ◽  
Yi Zhang ◽  
Jian Jun Ke ◽  
Xiao Wei Li ◽  
Lian Bing Cheng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Symmetric Model ◽  
The Finite Element Method ◽  
Circular Saw ◽  
The Face ◽  
Circular Saw Blade ◽  
Cyclic Symmetric ◽  
The Stability ◽  
Saw Blade

The finite element method was used to study tangential roller method impact on the stability of circular saw blade. Using 30 ° cyclic symmetric model is analyzed. The results show that the tension of the saw blade is not the same, and tensioning effect is different, when the tangential roller pressure is not same. At the same time, after tangential roller, the face run out of saw blade is small, which show that the smoothness of tangential roller is better.

Research on Numerical Simulation of Dynamic Pressure for Stress Sensibility Coal Seam

2011 ◽  
Vol 383-390 ◽  
pp. 2293-2299
Author(s):  
Yun Hong Ding ◽  
Bao Hui Wang ◽  
Xiang Zhen Yan
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
History Matching ◽  
Dynamic Pressure ◽  
Ordos Basin ◽  
Coupling Model ◽  
The Finite Element Method ◽  
Coal Seams ◽  
The Face ◽  
Good Agreement

Based on the orthotropic physical properties of coal cleats, the fluid-solid coupling model for stress sensibility coal seams is established. The equations of the coupling model are solved by using the finite element method. The history matching for JS-3 well in Ordos basin is carried on by using the coupling model. The comparison between calculated results based on the coupling model and the measured values indicates their good agreement, which verifies the accuracy and rationality of the model. The effect of the permeability orthotropic coefficient of coal cleats on the pressure distribution in coal seams is analyzed. The results show that the pressure along the butt cleats direction increases with permeability orthotropic coefficient increasing; The pressure along the face cleats decreases with permeability orthotropic coefficient increasing between 0m~30m and 170m~200m, whereas both increases from 30m to 170m.

Comparative analysis of adhesive failure of orthodontic resins: An in vitro mechanical test with the finite element method

2013 ◽  
Vol 2 (2) ◽  
pp. 124
Author(s):  
OrlandoMotohiro Tanaka ◽  
AnaLeticia Rocha Avila ◽  
Ana PaulaGebert de Oliveira Franco ◽  
MildredBallin Hecke ◽  
Marco AntonioAmorin Vasco ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Analysis ◽  
Mechanical Test ◽  
The Finite Element Method ◽  
Adhesive Failure ◽  
Element Method

scholarly journals BOND STRENGTH OF BAR USING GROUTING FOR PRECAST CONCRETE CONNECTION

2019 ◽  
Vol 1 (01) ◽  
pp. 1-9
Author(s):  
Anis Rosyidah ◽  
I Ketut Sucita ◽  
Praganif Sukarno ◽  
S. R. Permita Sari ◽  
Chintya Sari
Keyword(s):  
Finite Element Method ◽  
Bond Strength ◽  
Test Specimen ◽  
Precast Concrete ◽  
Second Phase ◽  
Strength Ratio ◽  
The Finite Element Method ◽  
Additional Material ◽  
Damage Pattern ◽  
Pullout Testing

In precast concrete, a connection is needed to unite the components so that they become a whole unified structure. This study aims to determine the reinforcement strength and length of reinforcement in precast concrete connections. To paste reinforcement into precast concrete, giving additional material in the form of grouting which is called sika grout 215 and functions as an adhesive is necessary. Pullout testing is carried out in the laboratory, and its simulation by modeling uses the finite element method based software. This research is divided into 2 phases. The first phase is making specimen to examine the bond strength between the concrete and reinforcement that has been given sika grout 215. So monolithic specimen is made as a comparison. The result of the bond strength of the monolithic test specimen is 6.24 MPa, and the sika grout 215 category is 6.52 MPa. From the experimental results in the laboratory with modeling, it is obtained the bond strength ratio of 0.94. The length of development (ld) based on the results of the testing phase I of 200 mm. The second phase is examining the damage pattern due to the stress that occurred. Specimens are made into 4 categories, namely modeling developments with the length of 120 mm (<40% ld), with the length of 160 mm (<20% ld), with length of 200 mm (= ld), and with the length of 260 mm(> 30% ld) both for monoliths and sika grout 215. The damage pattern, which is in the form of yielding and breaking reinforcement as the result of the pullout experiment in the laboratory shows not much different from the result of simulation using the software.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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