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Showing 1 to 17 of 17 for “"Wedge Test"”.
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Determining Interfacial Adhesion Performance and Reliability for Microelectronics Applications Using a Wedge Test Method
… A series of experiments was conducted using wedge test specimens to investigate the adhesion performance of the systems subjected to a range of environmental conditions. Both silicon and glass systems were relatively insensitive to temperature over a range of 22-60°C, but strongly accelerated …
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Accelerated Durability Characterization of Laminated Polycarbonate Systems
… crack growth in these laminates. The main test utilized is the wedge test, where a wedge is inserted between two polycarbonate adherends bonded together with an interlayer. The wedge causes a debond (a crack) to form. This crack may then grow over time. The crack growth in wedge test …
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Characterization of the Interfacial Fracture of Solvated Semi-Interpenetrating Polymer Network (S-IPN) Silicone Hydrogels with a Cyclo-Olefin Polymer (COP)
… was collected through the application of the wedge test, a relatively simple test allowing for the measurement of fracture properties over time in environments of interest. In this case, the test was performed at discrete temperatures within range of 4Ë C to 80Ë C. Two COP adherends were …
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Effect of a derivatized oxide layer and environment on the bond durability of aluminum/polyimide and titanium/polyimide bonds
… Samples were bonded with LaRC-IA adhesive in a wedge test geometry. Environmental testing consisted of static and cyclical exposure for 240 hours in three atmospheres: 1) 170°C, 2 torr; 2) -20°C; 3) 60°C, 70% relative humidity. Crack propagation arrested within 48 hours. The order of durability …
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Metal/polymer interactions in polyimide adhesives
… interface was studied using both the T-peel and wedge tests. In some cases, oxidized sulfur was detected on the failed surfaces via XPS. No apparent effect was observed in the T-peel test, where the T-peel strengths of non-sulfur and sulfur containing polyimides were similar. In the wedge test, …
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Time- and Temperature-Dependence of Fracture Energies Attributed to Copper/Epoxy Bonds
… the bond when it is broken. Since the 90° peel test has been widely employed in quasi-static fracture testing of film adhesion for printed circuit board applications, this test was first used as a basis to which other test results could be compared. A test fixture was designed and built for …
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Water based adhesive primers on aluminum substrates
… All adhesive bonding was done using the wedge test configuration with a structural epoxy adhesive, Naviloc® XY 0210, which was cured for 30 min. at 180°C. The wedge samples were immersed in 80°C water and crack lengths were monitored as a function of time. Both the initial crack length …
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Face Sheet/core Debonding In Sandwich Composites Under Static And Fatigue Loading
… types of delamination experiments, namely T-peel test and wedge test were implemented to evaluate fracture toughness in polyurethane foam core sandwich composites. It is shown that both tests can provide reliable values for mode I fracture toughness. Two analytical solutions for models (double …
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The Design and Implementation of a Supersonic Indraft Tube Wind Tunnel for the Demonstration of Supersonic Flows
<p>Historically, the endeavor of scale testing flight vehicles at supersonic Mach numbers, especially for long durations, has required the development of closed-loop wind tunnels, which are extremely expensive both to build and operate due to the high complexity and incredible power required to …
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Effect of surface treatment on the mechanical properties of the polysulfone-Al/Li bonded system including thin film studies of moisture intrusion and the viscoelastic response of the interphase region
… interaction involved single lap shear joints and wedge samples following an FPL etch, sulfuric acid anodization (SAA) and phosphoric acid anodization (PAA). The study of the Al/Li surfaces involved the determination of the elemental composition and morphological features of the pretreated adherend …
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Crystallization, Morphology, Thermal Stability and Adhesive Properties of Novel High Performance Semicrystalline Polyimides
… polyimides. The BPDA based polyimide was also tested extensively as a structural adhesive using Ti-6Al-4V coupons. Additionally, these polyimides are based on monomers, that are presently commercially available. The bulk thermal stability of the polyimides was first evaluated using dynamic and …
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Proprioception, jumping capacity and agility in beach versus indoor volleyball players
… the inclusion criteria. Each player attended a testing session where they were given an informed consent sheet. If they decided to consent to participate and sign the form, a screening questionnaire was administered to determine eligibility to participate. Due to the COVID pandemic, participants …
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Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
… evaluated. All the samples for both mechanical tests and thermal tests were aged at 85%, 100%RH for periods of up to 50 days. Studies of bulk conductive adhesives suggested that both plasticization, which is reversible and further crosslinking and thermal degradation, which are irreversible, …
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The Thermal Stability of Anodic Oxide Coatings - Strength and Durability of Adhesively Bonded Ti-6Al-4V Alloy
… Ti-alloy when exposed to high temperatures. The wedge test configuration was used to investigate the influence of temperature on the bond durability of adhesively bonded chromic acid anodized Ti-6Al-4V alloy in air. Based on the average crack length vs. exposure time data, the bond durability …
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Experimental and Numerical Investigations on the Durability and Fracture Mechanics of the Bonded Systems for Microelectronics Application
… energy release rate, G, and temperature using a wedge test geometry. The specimens consist of two glass plates bonded with a thin layer of proprietary epoxy adhesive. The crack fronts along the epoxy/glass interfaces were measured using an optical stereomicroscope. The relationship between G and …
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Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness
… process. These techniques make use of such test geometries as the double cantilever beam (DCB), asymmetric double cantilever beam (ADCB), single-leg bend (SLB), end-loaded split (ELS), and split cantilever beam (SCB) specimens. Symmetric versions of the DCB, SLB, and ELS specimens produced …
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Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications
… Ti-6Al-4V/FM-5 bond durability. Initially, wedge tests were utilized to find a durable surface pretreatment for the titanium adherends. Based on an extensive screening study, chromic acid anodization (CAA) was chosen as the standard pretreament for this research project. Double cantilever …