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Showing 1 to 20 of 58 for “"double cantilever beam"”.
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Characterization and Performance of a Self -Healing Composite Material
… with embedded microcapsules and catalyst. Double-cantilever-beam (DCB) and width-tapered double-cantilever-beam (WTDCB) specimens were tested to study the healing of delamination in composites by comparing the toughness of the virgin specimen with the toughness of the same specimen after …
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Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness
… 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 mode mixities of 0°, …
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Effects of Surface Microstructure on the Strength of Adhesively Bonded Structures
… of an aluminum-epoxy interface. A layered double cantilever beam (LDCB) specimen was chosen for this experiment. The LDCB specimen was debonded by peeling off the epoxy layer from the aluminum substrate using a steel wedge. Interfacial fracture energy was extracted from the debond length by …
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Effect of temperature on the fracture behavior of lead-free solder joints
… behavior of Cu-SAC305-Cu joints. To this end, double cantilever beam (DCB) specimens, consisting of a thin layer of Sn96.5Ag3.0Cu0.5 (SAC305) solder sandwiched between two copper bars, fabricated under standard surface mount (SMT) processing conditions are fractured under various temperatures …
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Characterizing the Durability of PF and pMDI Adhesive Wood Composites Through Fracture Testing
… of wood products were assessed using the double-cantilever beam (DCB) method of fracture testing. The relative durability of phenol-formaldehyde (PF) and isocyanate (pMDI) adhesives was compared using a 2-hour boil test and an environmental test. The feasibility of using oriented …
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Modeling and testing of stitched composite laminates for enhanced interlaminar strength
… properties of the stitched material.;Tensile and Double Cantilever Beam testing indicated that translaminar stitching degrades the effective extensional modulus of the laminate by about 15.9 percent, while it enhances the opening Mode I interlaminar fracture toughness. This degradation in the …
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Durability and mode-I fracture of fiber-reinforced plastic (FRP)/wood interface bond
… to wood (used commercially for glulam timber beams) and wood cores wrapped with FRP by filament winding (being investigated for reinforced railroad wood crossties and utility wood poles). First, the service performance and durability of FRP-wood interface bond is evaluated using a modified …
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Mode I Delamination Fracture Characterization of Polymeric Composites under Elevated Temperature
… J-integral, Js, for a linear viscoelastic double cantilever beam (DCB) specimen. Special test setup is designed and validated for determining accurate Js using just the applied load and the load end rotation angles. This new methodology is then applied to measure the mode I fracture …
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Self-healing of delamination damage in glass/epoxy composites using catalyst functionalized fibers
… damage is evaluated in these composites using double cantilever beam (DCB) specimens. Recovery of interlaminar fracture damage is initiated by the injection of liquid dicyclopentadiene (DCPD) onto the fracture surface of the functionalized fiber composites whereby the catalyst on the surface of …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
… of the standard test configurations for Mode I (Double Cantilever Beam) and Mode II (End Load Split) are carried out using the explicit code. Verification of these coupon tests leads to the crash analysis of realistic structures like the square composite tube. Analyses of bonded and unbonded …
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Microvascular strategies for damage restoration
… crack length in-situ is presented for the double cantilever beam specimens and a method for creating branched vasculature via 3D printing of poly(lactic acid) is introduced. The components of two-part healing agents must successfully mix in the damage region to obtain a healing response. An …
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Comportamento do aco inoxidavel ABNT 304 a corrosao-sob-tensao em solucoes aquosas neutras de nacl a temperatura de ebulicao utilizando a tecnica de carga constante
… do tipo dupla viga em balanço (T-notch double cantilever beam: TN-DCB), com intuito de observar a influência do fator de intensidade de tensão, concentração da solução e potencial eletroquímico. Estimou-se o valor do fator de intensidade de tensão limite (KICST) e a velocidade de …
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Investigating the Surface Energy and Bond Performance of Compression Densified Wood
… Bond performance was studied using opening mode double cantilever beam fracture testing and cyclic boiling of one half of all fracture samples. Phenol formaldehyde film (PF-film) and polymeric diphenylmethane diisocyanate (pMDI) were the two different adhesives used to bond fracture samples. …
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… prepreg samples was measured using a double cantilever beam (DCB) interlaminar fracture toughness test. The fracture mechanisms were determined to be different in the healed DCB specimen than the virgin specimen due to resin flow at the crack plane during the healing tests. The CT test …
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Self-healing of high temperature cured epoxy and composites
… adhesive were evaluated using the width-tapered-double-cantilever-beam (WTDCB) specimen geometry. The same healing system was then incorporated into a commercial high temperature cured rubber toughened epoxy adhesive, FM®73M. The addition of 117 μm average diameter microcapsules into ca. 750 μm …
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Experimentation of Mode I and Mode II Fracture of Uni-Directional Composites and Finite Element Analysis of Mode I Fracture Using Cohesive Contact
… Abaqus/Standard was used to simulate the mode I double cantilever beam (DCB) experiment of ASTM D5528. Cohesive contact was found to accurately and efficiently model DCB testing as the critical load- displacement values and steady state fracture agreed with experimental data. A parametric study …
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Relating polymer matrix composite delamination behavior to constituent properties
… model. A global-local finite element model of a double cantilever beam specimen is used to study the prediction of delamination initiation by examining inelastic matrix deformation at the crack tip. In addition, a fiber bridging fatigue model is created to analyze crack propagation data that …
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Wafer bonding : mechanics-based models and experiments
… on bonding. The accuracy of the wafer bonded double cantilever beam, which
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An Improved Method for the Fracture Cleavage Testing of Adhesively-Bonded Wood
… improvements were: 1) the use of the flat double cantilever beam (DCB) geometry, which has been uncommon for wood and 2) the application of an established and powerful data analysis using a corrected compliance method from beam theory. Three studies were conducted using various wood …
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The development of poly(vinylidene fluoride) piezoelectric sensors for measuring peel stresses in adhesive joints
… studies, XPS analysis and 1800 peel and tapered double cantilever beam adhesion specimens. An acid etch using a mixture of acetic, phosphoric and nitric acids was found to greatly improve the bond strengths to an epoxy adhesive without reducing the piezoelectric activity of the film. The …
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