Strength of Adhesive T-Joint in Granulator Fluidization Bed at Elevated Temperature (original) (raw)
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Applied Mechanics and Materials, 2014
Stress analysis of adhesive bonding of urea granulator fluidization bed was performed by using finite element method. The main objective of this project is to develop an alternative joining technique for urea granulator fluidizationbed by using adhesive bonding. The problem can solve by using commercial finite element package ANSYS version 13.0. T-joint and double T-joint are the main adhesive joints which will be focused in this project. The stresses on stainless steel plate can reduce by increasing the thickness of adhesive as demonstrated in numerical analysis results. Different thickness of adhesive will give different value of maximum von Mises stress. It shows that greater thickness resulted in higher maximum. This analysis proves that increasing the adhesive thickness will reduces the joint strength because stress was concentrated more on the adhesive interfaces. The adhesive bonding on T-joint is stronger than other design of joint because it need lower stress. It followed by first design of double T-joint and second design of double T-joint.
Finite Element Stress Analysis of Adhesive T-joint with Crack in Fluidization Bed
In this study, adhesive T-joint with crack in urea granulator fluidization bed was analyzed by finite element (FE) analysis. Objectives of this project were to examine a series of adhesively bonded T-joints with crack under mode I loading, to evaluate stress analysis of adhesive T-joint with crack at top and bottom and to identify the effective bond thickness. The path was drawn in ANSYS at the top and bottom of adhesive from side view to find which part has higher stress. The result of both paths top and bottom analysis shows the stress distribution always higher at both edges. So, the crack was inserted at interface edges and the stress distribution was evaluated. From interface edges stress distribution result of top and bottom, it shows that bottom edge has higher stress compare with top edge. The failure load analysis will compare with other analysis and experiment result. It is found that adhesive T-joint with 1.5mm is the best thickness for granulator fluidization bed applica...
Study on Influence of Moisture Absorption Strength of Adhesive T-Joint
Applied Mechanics and Materials, 2014
Adhesive is commonly required to fulfil an explicit mechanical role where mechanical properties can affect their performance. The mechanical properties of adhesive are known to vary with moisture content. This paper presents a study of moisture absorption epoxy adhesive joint as alternative to welding joint in urea granulator chamber. Welding joint requires high skills to avoid joint failure. In particular, bulk specimens were exposed to three humidity conditions, namely, 80ᴼC, 90ᴼC, and 100ᴼC at a constant time immersion of 15 minutes in water. Compression test revealed that Young modulus decreased with increasing water temperature. Moisture condition has some effect on the strength of the adhesive bonding with certain thickness. 1.0 mm of adhesive thickness provides the highest value failure load for every thickness and conditional water temperature. Experimental result indicated that failure load of adhesive T-joint at room and 90ᴼC water temperature give relatively high value of strength if compared to water temperature at 80ᴼC and 100ᴼC.
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This study evaluates the effect of temperature upon adhesive properties and behavior of adhesively bonded T-joint. Finite element analysis is conducted to study the effect of this parameter on the durability joint and stress distribution within the adhesive layer. A series of temperatures and stress analyses has been performed for the T-joint configuration. The parametric studies on the FE model revealed that stress distributions are sensitive to the changes in adhesive properties due to changes in temperature. Conclusion, stresses were reduced with changes in the temperature which resulted in the ability of the adhesive layer to undergo plastic deformation.
Bonded joints of dissimilar adherends at very low temperatures - An adhesive selection approach
Theoretical and Applied Fracture Mechanics, 2016
Maintenance, repair and overhaul companies have been reporting corrosion failure events in the Airbus A320 CFM56-5b intakes. These intakes are attached to the power plant frame by a dissimilar material bonded joint, where liquid shim adhesive is used to avoid the dielectric formation between dissimilar materials. In previous works, the authors reported that the A320 intakes corrosion is a result of the adhesive inability to avoid the dielectric formation, which is a result of micro-cracks formation within the adhesive layer. The main reason that lead to these cracks is the adhesive aging and thermal cycling at very low temperatures, which quite often reach values lower than À50°C. This paper studies the effect of negative thermal loading on dissimilar materials bonded joints. Two epoxy adhesives are studied and compared, namely the Hysol EA-934, which is the adhesive currently used in the A320 Airbus intakes, and the Hysol EA-9394, a second generation adhesive candidate to replace the actual adhesive. A numerical study was performed in order to simulate the adhesive joint using a finite element analysis commercial package, where several hypotheses were explored. These hypotheses where focused on the effects of several factors on the adhesive layer stress distribution. Factors such as temperature range, boundary conditions, variation of the coefficient of thermal expansion with temperature, and interfacial cracks between the adhesive layer and dissimilar adherend materials were analyzed. Results show that very low temperatures have a negative impact on the adhesives strength and micro-cracks formation may result from thermal loads below zero degrees Celsius, even for adhesives without any aging. Moreover, low temperatures in dissimilar materials bonded joints may create stress states that surpass the adhesive lap shear strength. Some conclusions are drawn regarding adhesive selection for dissimilar materials bonded joints in order to overcome these issues.
International Journal of Adhesion and Adhesives, 2009
Adhesively bonded lap and T joints are used extensively in the manufacture of automotive structures. In order to determine the effect of using a structural adhesive instead of spot-welding, a detailed series of tests, supported by finite element analyses, was conducted using a range of loadings. The adhesive was a toughened epoxy and the adherend was a grade of mild steel typical of that used in the manufacture of car bodyshells. The lap joints were tested in tension (which creates shear across the bondline) and three point bending. Previous studies at room temperature have shown that joint failure is dictated by adherend yielding and adhesive strain to failure. In the present study, to asses the effect of temperature that an automotive joint might experience in service, tests were carried out at À40 and +90 1C. It is shown that the failure criterion proposed at room temperature is still valid at low and high temperatures, the failure envelope moving up and down as the temperature increases or decreases, respectively.
Manufacture of adhesive joints and bulk specimens with high-temperature adhesives
International Journal of Adhesion and Adhesives, 2004
For high-temperature usage (200 C and above) such as in certain supersonic aircraft structures, the adhesives used are either bismaleimides or polyimides, generally supplied as films, with or without a carrier. Other adhesives, such as modified epoxies, can also be used up to 200 C.
The strength of adhesively bonded T-joints
International Journal of Adhesion and Adhesives, 2002
Although there has been much attention given to lap-shear joints, sheet metal joining often involves complex loading and designs. In this investigation, the strength of 901 T-joints was measured for a range of reinforcing methods. A commercial, aluminium-filled structural epoxy adhesive was used and the sheet was prepared by grit blasting. The steel in the joints exhibited significant plastic deformation before failure of the adhesive. This was especially evident in the base or 'horizontal' portion of the 'T'. By increasing the thickness of the base, the joint strength was increased. There were also considerable differences in strength between the different methods of jointing, using gusset plates, angles, and so on. The practical importance of these results is considerable and there are many lessons to be imparted to the designer of bonded sheet steelwork. Comparisons were also made with a welded or brazed joint, so as to give a target for structural efficiency.
Comparative Tests of Shear Strength of Adhesive Lap Joints after Thermal Shocks
Advances in Science and Technology Research Journal, 2021
This work presents the results of comparative tests for the determination of Young's modulus and the static shear strength of adhesive lap joints, based on grade 316L steel. The tests also concerned the determination of the glass transition temperature of a certain adhesive composition: Epidian 57 epoxy resin with a 10% Z1 hardener content. The paper shows the test results for the surface free energy and selected surface roughness parameters, including photographs of the test specimens after destructive testing. The tests were comparative and performed on adhesive joints, with and without exposure to thermal cycling. The scope of the testing included a relatively short thermal cycling run of 500 cycles with a temperature variation of-40°C to +60°C. An analysis was carried out of the results from testing the static shear resistance of specimens manufactured using various methods of adhesive joint seasoning. The experimental test results were statistically processed in compliance with good research practice.