scholarly journals A replacement of chromate coating for adhesive bonding of stainless steel in a corrosive environment

2014 ◽  
Vol 3 (3) ◽  
pp. 396
Author(s):  
Khaled Alawadhi ◽  
Richard Brown ◽  
Jalal Alsarraf
Keyword(s):  
Stainless Steel ◽  
Adhesive Bonding ◽  
Salt Spray ◽  
Adhesive Layer ◽  
Epoxy Adhesive ◽  
General Purpose ◽  
Standard Test ◽  
Test Method ◽  
Adhesively Bonded ◽  
Chromate Coating

For adhesive bonding of stainless steel to itself, a surface treatment involving chromates is used. However, chromates are environmentally unfriendly so a replacement is being sought. In this paper, an alternative to chromate was investigated. The standard test method, ASTM D 1002, was used to measure the failure load of adhesively bonded stainless steel samples. A general-purpose epoxy adhesive was used. To simulate marine exposure, adhesively bonded samples were placed in a 5% salt spray for extended periods of time, up to five weeks. Results indicated that the initial shear strength of adhesive joints prepared with a traditional chromate preparation was 25% greater than the new, alternative coating. However, more importantly, the rate of decrease in strength with salt spray exposure was greater for the chromate than for the alternative. After 21 days, both bonding surface treatments had the same strength. However, after this period of time, the alternative was stronger than the chromate treatment, indicating that the alternative was a more durable coating. An adhesive/adherent coated system was investigated using a finite element method in order to investigate the influence of adhesive thickness between the adhesive and the adherent, and the residual stress in the adhesive layer. Keywords: Adhesive, Alternative Coating, Crevice Corrosion, Potentio-Dynamic, Salt Spray.

scholarly journals Analysis of production parameters of single-lap bonds adhesive bonded with composites based on aluminium filler 

2017 ◽  
Vol 63 (No. 1) ◽  
pp. 36-44 ◽  
Author(s):  
Müller Miroslav
Keyword(s):  
Adhesive Bonding ◽  
Epoxy Adhesive ◽  
Polymer Particle ◽  
Material Strength ◽  
Adhesively Bonded ◽  
Metal Sheets ◽  
Bonded Joint ◽  
Negative Effect ◽  
Adhesively Bonded Joint ◽  
Agricultural Machines

In the area of bonding of sheets of metals, mainly in construction of transport and agricultural machines, single-lap bonds are used. In manufacturing corporations focused on bonding of the metal sheets the technologies such as riveting, welding and adhesive bonding are particularly used. These methods are frequently combined. The aim of the research was the evaluation of lap length of alloy AlCu4Mg adhesively bonded using two component epoxy adhesive, which is commonly used in construction of machines and its modification based in addition of filler in form of aluminium microparticles. The secondary aim of the research was to ascertain the influence of microparticle volume of aluminium filler on mechanical properties of polymer particle composite. Strength of adhesively bonded joint depends on the thickness of the bonded material. Strength of the adhesively bonded joint is dependent on the lapping length of adhesively bonded material. The highest values of strength of adhesively bonded joint were reached with the coefficient of the proportional length 0.27 ± 0.01. The assumption about negative effect of filler on tensile strength during the experiments was not confirmed. 

Strength of Adhesive T-Joint under Moisture Condition

2015 ◽  
Vol 819 ◽  
pp. 437-442
Author(s):  
S. Nurhashima ◽  
M. Afendi ◽  
B. Izzawati ◽  
A. Nor ◽  
A.R. Abdullah ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Water Temperature ◽  
Adhesive Bonding ◽  
Moisture Absorption ◽  
Failure Load ◽  
Perforated Plate ◽  
Weight Percent ◽  
Epoxy Adhesive ◽  
Moisture Condition ◽  
Adhesive Thickness

In this study, an experimental investigation was conducted in order to determine the effect of moisture absorption at different adhesive thickness (i.e., 0.5, 1.0, 1.5 and 2.0 mm) on strength of adhesive T-joint in urea granulator fluidization bed. In particular, T-joint specimens were exposed to three humidity conditions, namely, 80°C, 90°C, and 100°C at a constant time immersion of 15 minutes in water. Stainless steel plate and stainless steel perforated plate were joined by using a specific adhesive jig according to desired thickness. Tensile test was conducted by using universal tensile machine (UTM) at room temperature. The result obtained has enabled to explain the failure mechanisms and characteristics of adhesive T-joint with respect to moisture condition and bonding thickness. Epoxy adhesive with several weight percent of water absorption will degrade the physical properties of the adhesive. Moisture condition has some effect on the strength of the adhesive bonding. 1.0 mm of adhesive thickness provides the highest value of failure load. Experimental results indicated that failure load of adhesive T-joint at room and 90°C water temperature give higher value of strength if compared to water temperature at 80°C and 100°C.

The Effect of Geometry and Material Properties on the Load Capacity of Single-Strapped Adhesive Bonded Joints

2008 ◽  
Vol 399 ◽  
pp. 89-96 ◽  
Author(s):  
Marin Sandu ◽  
Adriana Sandu ◽  
Dan Mihai Constantinescu ◽  
Ştefan Sorohan
Keyword(s):  
Adhesive Bonding ◽  
Load Capacity ◽  
Dissimilar Materials ◽  
Adhesive Layer ◽  
Adhesive Bond ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesive Bonded Joints ◽  
Major Factors ◽  
Selection Of

Adhesive bonding is a particularly effective method of assembling complex structures, especially those made from dissimilar materials. If the joint is well designed and correctly executed, the adhesive bond ought to be one of the strongest components of the structure and most certainly should not be the reason for reducing the load capacity or fatigue life. The major factors determining the integrity of an adhesive bond are selection of the most appropriate adhesive, joint design, preparation of the bonding surfaces, strict quality control in production and monitoring in service. This work focuses on the evaluation of the load capacity of some configurations of adhesively bonded single-strapped joints based on finite element analyses. The adhesive layer thickness, the overlap length, the adherent and strap thicknesses were varied as well as the materials properties.

Effect of Alkali on the Impact Toughness of Adhesively Bonded Joints

2012 ◽  
Vol 166-169 ◽  
pp. 1904-1907
Author(s):  
Min You ◽  
Chun Zhi Mei ◽  
Wen Jun Liu ◽  
Jing Rong Hu ◽  
Ling Wu
Keyword(s):  
Impact Toughness ◽  
Moisture Absorption ◽  
Adhesive Layer ◽  
Epoxy Adhesive ◽  
Alkali Solution ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Single Lap Joint ◽  
The Impact

The effect of the temperature and immersed time of the alkali solution on the impact toughness of the adhesively bonded steel single lap joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness of the specimen increased when the immersed time increased then it decreased as it beyond 3 days. When the immersed time is longer than 72 h, the higher the temperature is, the lower the impact toughness of the joint. The moisture absorption of the adhesive layer with the immersed time was also investigated and it was found that there is a relationship to the impact toughness of the adhesively bonded single lap joint. The epoxy adhesive layer was analyzed with FT-IR and it was found that the hydroxyl enhanced and bonding strength may increase after 72 h immersed in alkali solution.

Fatigue Life Estimation of Adhesively Bonded Scarf Joints Based on a Continuum Damage Mechanics Model

2005 ◽  
Vol 13 (4) ◽  
pp. 359-370 ◽  
Author(s):  
Makoto Imanaka ◽  
Makoto Taniguchi ◽  
Tatuyuki Hamano ◽  
Masaki Kimoto
Keyword(s):  
Fatigue Strength ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Estimation Method ◽  
Adhesive Layer ◽  
Epoxy Adhesive ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Scarf Joints

An estimation method of fatigue strength of adhesively bonded joints with various stress triaxialities in the adhesive layer has been proposed based on a damage evolution model for high cycle fatigue. To realize various triaxial stress states, fatigue test was conducted for adhesively bonded butt and scarf joints with various scarf angles bonded by a rubber-modified epoxy adhesive. An equation for estimating the damage evolution in the adhesive layer of the butt and scarf joints was derived from the damage model, where undefined parameters in the equation were determined by comparing the experimentally obtained damage evolution curves of the butt joints with the estimated damage evolution curves. Furthermore, an equation for the estimation of fatigue strength was derived under the assumption that fatigue failure occurs when the damage variable reaches to a critical value. When compared the experimental S-N data of scarf joints with the estimated ones, the estimated fatigue strengths agree well with the experimental data with various scarf angles. This finding suggests that the CDM model is applicable for estimating fatigue strength of adhesively bonded joints with different stress triaxialities.

Influence of Fabric Structure on Shielding Effectiveness of Anti-Electromagnetic Radiation Fabric

2014 ◽  
Vol 1028 ◽  
pp. 25-29
Author(s):  
Jun Mei Liu
Keyword(s):  
Stainless Steel ◽  
Steel Fiber ◽  
Great Influence ◽  
Standard Test ◽  
Test Method ◽  
Cotton Yarn ◽  
Shielding Effectiveness ◽  
Fabric Structure ◽  
Stainless Steel Fiber ◽  
Better Than

In this paper, the standard test method of fabric shielding effectiveness was simply introduced in order to understand systematically the influence of fabric structure of stainless steel fiber on the shielding effectiveness. The different fabrics were woven using of stainless steel monofilament cotton yarn, stainless steel multifilament cotton yarn and stainless steel fiber cotton yarn. Then shielding effectiveness of these fabrics was measured. Results show that spacing between the stainless steel filaments has a great influence on the shielding effectiveness. The shielding effectiveness of fabric will reduce in a certain range when distance of stainless steel filaments is lengthened. Then shielding effectiveness of blended fabric will increase with increasing of the content of stainless steel fiber. The shielding effectiveness of duplex stainless steel filament fabrics is much better than unidirectional stainless steel filament fabric. Under the same testing condition the shielding effectiveness is different between stainless steel monofilament blended fabric and stainless steel multifilament blended fabric. The structure of stainless steel blended yarn has a great effect on shielding effectiveness of shielding fabric, the shielding effectiveness of stainless steel fiber blended fabric is better than the stainless steel filament blended fabric because the content of stainless steel fiber is difference between two kinds of yarn structure.

scholarly journals Resistance Spot Weld assisted with Adhesive Bonding

2019 ◽  
Vol 8 (4) ◽  
pp. 6978-6982
Keyword(s):  
Spot Welding ◽  
Adhesive Bonding ◽  
Sheet Thickness ◽  
Adhesive Layer ◽  
Epoxy Adhesive ◽  
Adhesive Joints ◽  
Spot Weld ◽  
Low Carbon ◽  
Weld Bonding ◽  
Resistance Spot

This paper presents an experimental investigation of the weld bonding of low carbon steel (JIS G3141) together with adhesive layers to increase the mechanical properties of weld bonding. Epoxy adhesive was used in this research applied on the sheet thickness of 1.2 mm. The weld-bonding was carried out by applying layer of adhesive followed by resistance spot welding on surface samples. The relative properties and characteristics of the resulting weld-bonded-adhesive joints are evaluated and compared with the conventional spot-welding through tensile-shear, peel, hardness tests and macro-etching observations. The strength of weld bond joints was calculated and compared with those in as-weld and adhesive-bond joints. Results showed that the strength of weld-bond adhesive is higher than as-weld specimen. The hardness distribution of weld bond adhesive joints was investigated, at three regions i.e. base metal (BM), the heat-affected zone (HAZ), and the fusion zone (FZ) using micro-hardness Vickers machine. It can conclude that the presence of adhesive does not affect the hardness of weld-bonded. From macro- etching observation, the layer adhesive influenced the weld bond via the size nugget of weld-bonded which is smaller than as-weld. The introduction of adhesive layer in spot welding improves the joint strength and quality of spot weld.

Adhesive Bonding of Glass Fiber Reinforced Polypropylene

2011 ◽  
Vol 399-401 ◽  
pp. 1942-1945 ◽  
Author(s):  
Jian Guang Zhang ◽  
Xiao Dong He
Keyword(s):  
Glass Fiber ◽  
Adhesive Bonding ◽  
Adhesive Layer ◽  
Fiber Reinforced ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Low Surface Energy ◽  
Lap Shear ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber

Joining behavior of long glass fiber reinforced polypropylene (LFT) by three types of adhesive was investigated. Single-lap shear testing was used to evaluate the performance of adhesively bonded structures. The two-part acrylic adhesive DP8005 was determined to be the best among the three adhesive candidates, which was attributed to its low surface energy. The stress distribution in the adhesive layer of the single lap joint was modeled by static elastic analysis using ANSYS software. The shear and peel stresses peaked at the edges of the adhesive layer.

scholarly journals Numerical and Experimental Study of Tensile Strength of Single and Double-Strap Repairs

2012 ◽  
Vol 730-732 ◽  
pp. 1018-1023
Author(s):  
Arnaldo M.G. Pinto ◽  
Raul D.S.G. Campilho ◽  
Isabel R. Mendes ◽  
A.G. Magalhães ◽  
A.P.M. Baptista
Keyword(s):  
Adhesive Bonding ◽  
Failure Modes ◽  
Cohesive Zone Model ◽  
Fatigue Cracks ◽  
Adhesive Layer ◽  
Elastic Stiffness ◽  
Zone Model ◽  
Shear Stresses ◽  
Adhesively Bonded ◽  
Shear Modes

Adhesive bonding as a joining or repair method has a wide application in many industries. Repairs with bonded patches are often carried out to re-establish the stiffness at critical regions or spots of corrosion and/or fatigue cracks. Single and double-strap repairs (SS and DS, respectively) are a viable option for repairing. For the SS repairs, a patch is adhesively-bonded on one of the structure faces. SS repairs are easy to execute, but the load eccentricity leads to peel peak stresses at the overlap edges. DS repairs involve the use of two patches, one on each face of the structure. These are more efficient than SS repairs, due to the doubling of the bonding area and suppression of the transverse deflection of the adherends. Shear stresses also become more uniform as a result of smaller differential straining. The experimental and Finite Element (FE) study presented here for strength prediction and design optimization of bonded repairs includes SS and DS solutions with different values of overlap length (LO). The examined values ofLOinclude 10, 20 and 30 mm. The failure strengths of the SS and DS repairs were compared with FE results by using the Abaqus®FE software. A Cohesive Zone Model (CZM) with a triangular shape in pure tensile and shear modes, including the mixed-mode possibility for crack growth, was used to simulate fracture of the adhesive layer. A good agreement was found between the experiments and the FE simulations on the failure modes, elastic stiffness and strength of the repairs, showing the effectiveness and applicability of the proposed FE technique in predicting strength of bonded repairs. Furthermore, some optimization principles were proposed to repair structures with adhesively-bonded patches that will allow repair designers to effectively design bonded repairs.

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