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 23 for “"transverse cracking"”.
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Hot ductility and its relationship to transverse cracking in steels
… very detrimental to hot ductility and to avoid transverse cracking, it is suggested magnetic stirring be used in the mould to break up the columnar structure.
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Stiffness reduction resulting from transverse cracking in fiber- reinforced composite laminates
… including fiber breakage, delamination, and transverse cracking, have been observed to contribute to the mechanical degradation of fiber-reinforced composite laminates. In this investigation, the effect of transverse cracking on laminate stiffness was studied. Four. glass-epoxy laminates …
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Characteristics of thermally-induced transverse cracks in graphite-epoxy composite laminates
The characteristics of thermally-induced transverse cracks in T300/5208 graphite-epoxy cross-ply and quasi-isotropic laminates were investigated both experimentally and analytically. The formation of transverse cracks and the subsequent crack spacing present during cooldown to -250°F (116K) and …
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Calibrated mechanistic design procedure for jointed plain concrete pavements
… distresses. The distresses considered are slab transverse cracking, joint faulting and joint spalling.
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Multiscale characterization of carbon fiber-reinforced epoxy composites
Transverse cracking is an early form of damage in fiber-reinforced composite materials that can nucleate delamination, fiber breakage, and ultimate failure. Although many variables influence transverse cracking, little work has been done to characterize local and complex microstructural features …
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Preliminary Study of Highway Pavement and Materials
… in-place air voids and other factors on fatigue cracking using Long-Term Pavement Performance data, (b) fracture properties of asphalt concrete in a semicircular bend (SCB) test using a noncontact camera and crosshead movement, and (c) hot applied modified-binder-chip-seal field performance in …
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IGFEM modeling of transverse failure in carbon-epoxy composites and implementation of the IGFEM in Abaqus FEA
… and against strain measurements of the onset of transverse cracking performed on a [0/90/0] carbon/glass-epoxy laminate. Furthermore, a large dataset of realistic virtual microstructures is created from optical images of test specimens and was simulated to study the effects of microstrucutural …
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Sensitivity of MEPDG Using Advanced Statistical Analyses
… Outputs such as terminal IRI, longitudinal cracking, and alligator cracking are highly sensitive to bottom AC layer thickness. MEPDG outputs are also sensitive to HMA mix properties such as thickness, percent air void, binder content and PG grade. Longitudinal and transverse cracking are …
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Hot ductility of TWIP steels
… steels are difficult to continuous cast and cracking can occur at the slab surface. Therefore it becomes very important to gain an understanding of the cause of this cracking, in order to prevent their occurrence. To assess the likelihood of the cracking in these high Al TWIP steel slabs …
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Sensitivity of Distress Rate to Observed Distress Levels
… procedures that were altered the most were for transverse cracking and alligator cracking. This research evaluates how sensitive the DR is to the revised data collection procedures. The comparison used a single milepost test section and one evaluator as ground truth data and then varied input …
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Evaluation of In-Situ variability of concrete pavement characteristics and their effect on performance
… characteristics that significantly affected transverse cracking in Jointed Plain Concrete Pavements (JPCP). This dissertation concentrated on quantifying the effect of concrete thickness variability and, to a lesser extent, flexural strength variability on the reliability analysis of jointed …
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Performance of the Crack, Seat, and Overlay Rehabilitation Technique for Concrete Pavements in California
… on dependent (distress) variables: alligator cracking, transverse cracking, longitudinal cracking, and International Roughness Index (IRI). And independent (explanatory) variables: age, traffic in the form of equivalent single axle load (ESAL), thickness of hot mix asphalt (HMA), thickness of …
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Development of Mechanistic-Empirical Principles for Jointed Plain Concrete Pavement Fatigue Design
… in pavement analyses. Top-down and bottom-up transverse, longitudinal, and corner cracking were found to be critical fatigue mechanisms depending on the pavement geometry, climatic zone, and material parameters selected. These results are in contrast to the assumed bottom-up, mid-slab …
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Investigation on the mechanisms of block cracking in asphalt pavements
Block cracking in asphalt pavements is a primary form of surface cracking but has been the subject of very few scientific investigations. The extensive nature of this cracking form often leads to significant maintenance costs and reduces the ride quality and service life of the pavement surface. …
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Network-level maintenance decisions for flexible pavement using a soft computing-based framework
… and extent of seven distress types (alligator cracking, block cracking, longitudinal and transverse cracking, patching, potholes, bleeding and ravelling) were used as fuzzy inputs. The result showed a good correlation for fuzzy model. A sensitivity analysis showed a pavement crack has the …
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Cracking and Roughness of Asphalt Pavements Constructed Using Cement-Treated Base Materials
… base (CTB) that can lead to reflection cracking in asphalt surfaces. Cracking may then cause increased pavement roughness and lead to poor ride quality. The overall purpose of this research was to utilize data collected through the Long-Term Pavement Performance (LTPP) program to …
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Micromechanical Behavior of Fiber-Reinforced Composites using Finite Element Simulation and Deep Learning
… numerical simulations. We investigated multiple transverse cracking of cross-ply CFRP laminates on the microstructure level through simulating large numerical models. Such an investigation demands an efficient numerical framework along with significant computational power. Hence, an efficient …
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Characterization of Ohio Traffic Data for Integration into the Mechanistic-Empirical Pavement Design
… included longitudinal (top-down) fatigue cracking, alligator (bottom-up) fatigue cracking, transverse (low-temperature) cracking, rutting, and smoothness (expressed using IRI), while key performance parameters for the rigid pavement included transverse cracking (% slabs cracked), joint …
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Air-coupled non-destructive evaluation technology for condition assessment of railroad ties
… Crossties with different types of damage; transverse cracking, longitudinal cracking, loss of cross section, and rail seat damage (RSD) are tested in this study. Signal parameters computed from the damaged ties are compared with signal parameters obtained from ties in a good structural …
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Condition Assessment of Civil Infrastructure and Materials Using Deep Learning
… This work focused on longitudinal or transverse cracking. This work first built a dataset with four severity levels (no, low-severity, medium-severity, and high-severity) and three image types (visible, infrared, and fusion). Then this work applied the convolutional neural network …
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