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Showing 1 to 20 of 28 for “"double cantilever beam (DCB)"”.
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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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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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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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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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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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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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Systematic assessment of the influence of voids on the material performance and failure in additively manufactured polymers.
… toughness and fatigue crack propagation, while double cantilever beam (DCB) was utilized to assess Mode I interlaminar fracture toughness in multi-material FFF components. This work seeks to contribute to the widespread adoption of FFF process for functional applications, focusing on the role of …
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Mechanism of Fatigue Crack Growth at Polymer/metal Interface
… explored in the study of fatigue crack growth in double cantilever beam (DCB) specimens where a high fatigue strength was related to a fluctuating fatigue crack growth path. Associated with crack growth path selection as governed by the mix-mode condition, the failure mechanisms in the polymer …
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Development of image based crack measurements, to investigate delamination in different weave Fibre Reinforced Polymers
… the panels to produce the test specimens. The Double Cantilever Beam (DCB) test was used to measure the Mode I fracture toughness, following the standardised test method ASTM D5528. DCB tests requires two hinge blocks to be bonded to the specimens and is conducted using the Zwick machine which …
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Closed/Semi-Closed Form Solutions for Face/Core Debonds in Sandwich Beams
Sandwich beams are highly susceptible to debonding at the interface between face and core. These debonds can grow and eventually lead to complete failure of the structure. To understand and study such debonds analytically, an Elastic Foundation Analysis (EFA) can be used to incorporate the effects …
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Understanding the correlation between wrinkle morphology, fracture and fatigue of plain woven CFRP laminates through mechanical and ultrasonic characterization.
… wrinkle topologies at the ply interface in double cantilever beam (DCB) specimens. These wrinkles, characterized using ultrasonic testing and optical microscopy, were quantified by peak-to-valley and peak-to-base amplitudes using an 8-point Gaussian fitting method. Mode I fracture testing …
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A chemical and mechanical evaluation of interfacial fracture in dicyandiamide cured epoxy/steel adhesive systems
… with increasing toughener content. Static double cantilever beam (DCB), fatigue DCB, and notched coating adhesion (NCA) interfacial fracture performances all increased. X-ray photoelectron spectroscopy (XPS) and tunneling electron microscopy (TEM) analyses of the failed specimens revealed …
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Performance Evaluation and Durability Studies of Adhesive Bonds
… such as chewing gum. In the first chapter, a double cantilever beam (DCB) specimen geometry is proposed for combinatorial fracture studies of structural adhesive bonds. This specimen geometry enabled the characterization of fracture energy vs. bondline thickness trends through fewer tests than …
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Exploration of Wood DCB Specimens Using Southern Yellow Pine for Monotonic and Cyclic Loading
… for refining and understanding the flat wood double cantilever beam (DCB) as a valid means for testing Mode I fracture energy in wood adhesive bonds. Southern yellow pine (SYP) adherends were used with epoxy and phenol formaldehyde (PF) impregnated films, providing two systems with different …
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Face Sheet/core Debonding In Sandwich Composites Under Static And Fatigue Loading
… toughness. Two analytical solutions for models (double cantilever beam (DCB) specimen and tilted debond specimen (TDS) test) based on elastic foundation analysis are modified and validated for mode I loading. For mixed mode static loading, mixed mode bending (MMB) specimen was employed to …
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Experimental and Numerical Methods for Characterizing the Mixed-Mode Fracture Envelope for a Tough Epoxy
… Mode I fracture was evaluated with double cantilever beam (DCB) tests, mode II fracture was characterized by end-notched flexure (ENF) tests, and varying degrees of mixed mode I/II fracture were assessed through single leg bend (SLB), single-lap joint (SLJ), and asymmetric DCB and …
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Debond Buckling of Woven E-glass/Balsa Sandwich Composites Exposed to One-sided Heating
… understand the interfacial behavior, Mode I Double Cantilever Beam (DCB) fracture tests were performed at ambient, 60 C, and 80 C to determine the influence of the decreased Mode I fracture toughness. While ambient testing showed that stable crack growth could be obtained, high temperature …
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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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Evaluating Thermal and Mechanical Properties of Electrically Conductive Adhesives for Electronic Applications
… joints was then investigated utilizing the double cantilever beam (DCB) test. It was observed that the conductive adhesive joint was significantly weakened following hydrothermal aging, and there was a transition from cohesive failure to interfacial failure as aging continued. A comparative …
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