Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Compact Tension"”.
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Computational study of compact tension and double torsion test geometries
… by monitoring growth of a crack (typically in a compact tension ( CT) specimen) and continually reducing cyclic stress levels until the threshold condition is reached. This procedure is very cumbersome and time-consuming, and this project rather considers the design of a fracture mechanics …
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Experimental evaluation of monotonic and cyclic fracture behavior using disk-shaped compact tension test and released energy approach
… and cyclic loading using the disk-shaped compact tension (DC(T)) test and a released-energy based approach. The standard DC(T) test was revised to facilitate both monotonic and cyclic loading tests, including some modifications of the test geometry and testing modes. The research was …
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Crack growth resistance in nuclear graphite
… a fine grained graphite. Both 3-point bend and compact tension specimens are used. The fine-grain graphite shows lowest resistance, with the coarse-grained materials displaying similar R-curves. The compliance method is simplest but assumes the material is linear elastic, producing similar …
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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic composites
… resin samples. These included an interfacial tension test based on the ASTM tensile adhesion test (ASTM D897) and a fracture toughness test using a compact tension (CT) specimen (based on the ASTM toughness test for metals ASTM E399-83). The interfacial tensile test proved to be very difficult …
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Vliv geometrie vzorku na úroveň zavíracího napětí před čelem únavové trhliny
… dvou odlišných únavových vzorků, a to vzorků „compact tension specimen“ a „center cracked plate tension specimen“, s použitím nelineárního materiálového modelu. Modelování celého jevu je prováděno pomocí metody konečných prvků v programovacím jazyku, APDL, programu Ansys. První část práce se …
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Analysis of acoustic emission waveforms from fatigue cracks on a steel bridge hanger
… were detected. AE was monitored from A588 compact tension specimens under variable amplitude tension-tension fatigue loading, results of which were used to aid in the interpretation of AE data from the hanger. Crack growth AE were detected only on overload cycles mostly above 92% of maximum …
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A characterization of the fracture behavior of thick, notched, laminated graphite/epoxy composites
… fracture toughness utilizing the center-cracked tension, compact tension and three point bend specimen configurations. Fracture toughness was computed using the stress intensity factor results of a finite element stress analysis of each specimen geometry which treated the composite as homogeneous …
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Fracture Tests for Bituminous-Aggregate Mixtures: Laboratory and Field Investigations
… Single-edge notched beam (SE(B)) and disk-shaped compact tension (DC(T)) test geometries were developed to estimate the fracture energy of asphalt concrete. Fracture energy can be measured from these laboratory tests with adequate accuracy, which allows for the application of numerical models to …
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Fracture of aluminum naval structures
… them with unstiffened plates represented by compact tension (CT) specimens.
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The Influence of Reinforcement Architecture on the Fracture Behavior of Selectively Reinforced Materials
… architectures on fracture response of aluminum compact-tension (CT) specimens was performed using the finite element code ABAQUS. A three-dimensional crack propagation procedure based on the crack tip opening angle (CTOA) was developed using Python. Eleven different reinforcement architectures …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
… model based on experiments carried out on compact tension test specimens. The rate dependent model is incorporated into the interface element approach to capture the unstable crack growth observed in experiments under quasi-static loading conditions. The compact tension test gives the …
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Quantifying the Constraint Effect of Three-Dimensional Specimens with Biaxial Loading Using the J-A2 Method
… strain specimens, including three point bend and compact tension, to determine if loss of constraint exists. Finite element analysis models were developed for each specimen to determine the constraint parameter A2 for each, as well as Material Failure Curves for the materials and Crack Driving …
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Effect of aqueous environments on the fatigue behavior of 90-10 copper nickel
Fatigue tests on compact tension specimens of 90-10 copper nickel were conducted in 3.5% NaCl solutions. Anodic or cathodic currents were applied during testing. Anodic currents decreased and cathodic currents increased the fatigue life. Both anodic and cathodic currents changed the fracture mode …
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Autohesion model for thermoplastic composites
… autohesion model on a polysulfone (Udel P1700) compact tension specimen, a 64-ply graphic (Thomel T300)/P1700 unidirectional composite, and a 192-ply graphite (Hercules AS4)/P1700 unidirectional composite. A 64-ply T300/P1700 unidirectional composite was processed in a matched metal mold. …
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Fracture of Asphalt Concrete: A Cohesive Zone Modeling Approach Considering Viscoelastic Effects
… mode I fracture tests, e.g. disk-shaped compact tension (DC(T)), are performed considering viscoelastic effects. The ability to simulate mixed-mode fracture and crack competition phenomenon is demonstrated in conjunction with single-edge notched beam (SE(B)) test simulation. The predicted …
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Investigation of Toughening Mechanisms in the Fracture of Asphalt Concrete Using the Clustered Discrete Element Method
… into mode I fracture tests, e.g. disk-shaped compact tension (DC(T)) and single-edge notched beam (SE(B)) tests, to investigate various fracture mechanisms of asphalt concrete. The simulation results are shown to compare favorably with experimental results, and moreover, the simulations …
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Development of an alternative test to obtain asphalt mixture creep compliance at low temperatures
The Disk shaped compact tension [DC(T)] test and the Indirect Tensile [IDT] creep compliance tests are widely used in the pavement materials community to characterize the low temperature fracture and creep properties of asphalt materials. The information from these tests enables pavement engineers …
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Fatigue-fracture relation on asphalt concrete mixtures
… the plateau value (PV). Similarly, a disk-shaped compact tension DC(T) fracture test was used to obtain fracture energy parameters, including: fracture strength, pre-peak fracture energy, post-peak fracture energy, and total fracture energy. A factorial of the eight possible correlations was …
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Healing of complex damage modes in model composites
… of a complex composite panel. A modified compact tension is developed with a carbon fiber tow running orthogonally to the advancing crack plane. Initial testing of a non-healing control system reveals that the tow can survive crack propagation and that debonding of the matrix and tow …
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Laboratory and Field Evaluation of Two Warm-Mix Additives in Connecticut and Validation of an Alternative Moisture Susceptibility Test
… were collected in loose form and reheated and compacted in laboratory conditions (laboratory fabricated specimens). This paper discusses the effect of mix type on the results from several tests conducted in the laboratory, such as Semi-Circular Bending, Hamburg Wheel Tracking, Indirect Tensile, …
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