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Showing 1 to 20 of 55 for “"Lap-shear"”.
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Role of metal alkoxides as primers in polymer/metal adhesion
Steel is a material with a high tensile shear strength and is relatively inexpensive to produce. Further, it is widely used in industry and its use in adhesive bonding applications is increasing. Adhesively bonded structures offer several advantages over mechanical fastening such as reductions in …
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BOND STRENGTH EVALUATION IN ADHESIVE JOINTS USING NDE AND DIC METHODS
… defects and reliably predicting the bond shear strength. As a result, adhesive bonding technology is still not solely implemented in primary structures of an aircraft. Therefore, there is a greater demand for a novel NDE tool that can meet the existing aerospace requirement for adhesive …
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Adhesive bonding of stainless steel :Sstrength and durability.
… surface pre-treatments. Standard single overlap shear and floating roller peel tests conducted in ambient conditions were employed in the discrimination and the degree of compatibility between adhesive and adherend, as measured by the proportion of cohesive failure on the post-fracture face, …
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Adhesive bonding of stainless steel : strength and durability
… surface pre-treatments. Standard single overlap shear and floating roller peel tests conducted in ambient conditions were employed in the discrimination and the degree of compatibility between adhesive and adherend, as measured by the proportion of cohesive failure on the post-fracture face, …
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Design and optimisation of adhesively bonded overlap joints
… The most common joint configuration is the lap shear joint, which has been investigated widely and several ideas have been proposed to improve its performance. For example, the introduction of fillets at the overlap ends or tapering of the substrates can reduce the peel stresses at the …
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Surface characterization and adhesive bonding of carbon fiber-reinforced composites
… and scanning electron microscopy (SEM). Double lap shear and Boeing wedge configurations were used to evaluate the strength as well as the durability of the composites bonded with an epoxy film adhesive. Fluoropolymer residues which were found on the composite surfaces were fully removed by grit …
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THE SYNTHESIS AND CHARACTERIZATION OF DUAL-MODIFIED CARBOXYMETHYLCELLULOSE FOR BIOADHESIVE APPLICATIONS
… strength of the material was determined by lap shear testing with porcine skin. High molecular weight and medium molecular weight methacrylated dialdehyde carboxymethylcellulose (MeDCMCHV & MeDCMCMV) were engineered and MeDCMCHV was combined with low viscosity methacrylated CMC (MeCMCLV1) to …
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A study of blister tests for film adhesion measurement and fracture efficiency of tests for adhesive bonds
… blister, peninsula blister, peel, and cracked lap shear tests. It is found that the island blister and peninsula blister tests can produce very high energy release rates at low pressures by using a small island radius or a small peninsula width. However, these so called "high energy release …
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The effect of interchain transesterification reactions on the development of aromatic copolyesters
… transition temperatures to 250$\sp\circ$C, and lap shear adhesive strengths to titanium of up to 20 MPa.
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Avaliação da influência da espessura de adesivos estruturais em juntas metálicas com diferentes preparações superficiais
… used in this study sought to evaluate simple lap joints with different thicknesses of 0.1, 0.25 and 0.5 mm in metal samples mechanically prepared with sandpaper or Bristle Blaster, in order to identify the preparation mechanism that enabled the best mechanical resistance to shear (lap shear). …
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BOND BEHAVIOR BETWEEN STEEL AND HIGH MODULUS CFRP PLATES AT MODERATLEY ELEVATED TEMPERATURES
… of the research, five steel-CFRP bonded double-lap shear coupons were tested at different temperatures to characterize the bond behavior. In the second phase of testing steel beams were strengthened with different configurations of high modulus CFRP plates and subjected to different combinations …
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Surface analysis of sheet molded composite (SMC) material as related to adhesion
… surface treatments as well as after mechanical lap shear fracture tests for SMCs bonded with urethane adhesive. Surface chemical functionalities, including -C-0·R(X)/-NCOZR and -C=0 (ester carbonyl) groups, were found to promote good adhesion using urethane adhesives. These chemical …
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Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides
… adhesive investigations for TPER-BTDA utilized lap-shear test, wedge test and double cantilever beam tests. The durability of the adhesive and the fracture surface was studied after exposure to various solvents and after high aging and testing temperatures. The polyimide demonstrated very high …
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Durability of sheet molding compound/metal adhesive bonds
… with different modes of stress were employed: lap shear, wedge, and butt torsion. Specimens were exposed to an environmental cycle or to fixed conditions of temperature and humidity with or without load. For phase α-SMC/urethane/ELPO steel adhesive bonds, all visually determined adhesive …
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Predicting mechanical performance of adhesively bonded joints based on acousto-ultrasonic evaluation and geometric weighting
… the stress transfer capability of modified lap shear joints. Knowledge of the stress distribution in the joint has provided a means of identifying critical areas of interest in the joint. The adhesively bonded composite specimens were mechanically tested and performance correlated with NDE …
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The Thermal Stability of Anodic Oxide Coatings - Strength and Durability of Adhesively Bonded Ti-6Al-4V Alloy
The lap shear strength of chromic acid anodized, primed, Ti-6Al-4V alloy bonded with a high performance FM-5 polyimide adhesive has been investigated as a function of thermal treatment for selected times at various temperatures in air. The research findings indicate that the lap shear strength …
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Reliability Analysis of Carbon Fiber Reinforced Polymer (CFRP) Strengthened Steel Beams
… of adhesively bonded CFRP-to-steel double-lap shear (DLS) joints with thin outer adherends was performed first, to study the bond behavior when dominated by adhesive shear stresses. A comprehensive experimental database of the DLS joints was compiled to study the model uncertainty for the …
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Adhesive properties of silicone resins
… application such as structural adhesives. Single-lap shear tests were used to study several parameters, such as the thickness of the joint, the overlap length, the behavior at high temperature and a comparison with different adhesives. Results suggest that a 10% KPE / 6% Cab-O-Sil® modified …
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The Development of Gelatin Based Tissue Adhesives for Use in Soft Tissue Biomedical Applications
… resin. Thermal analysis, mechanical testing, and lap shear adhesive bond testing were utilized to characterize fresh GR-DIAL adhesive formulations and formulations dried at 370C. From the results, the diffusion processes, material and adhesive properties of the adhesive formulations were primarily …
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Numerical study of solder joint failure under fast loading conditions
… conditions. The finite element model assumes a lap-shear testing configuration, where the solder joint is bonded to two copper substrates. A progressive ductile damage model was incorporated into the rate-dependent constitutive response of the Sn (tin)-Ag (silver)-Cu (copper) solder alloy, …
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