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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 26 for “"cumulative damage"”.
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Cumulative Damage in the Fatigue of Structural Joints
Made available in DSpace on 2015-05-12T17:06:19Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0015205.PDF: 4066287 bytes, checksum: aad54bfdbdce0440449ea57d85f6546e (MD5) Previous issue date: 1955
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The Effect of Stress History on Cumulative Damage in Fatigue
Made available in DSpace on 2014-12-05T17:36:46Z (GMT). No. of bitstreams: 1 0005246.pdf: 4717964 bytes, checksum: 2e79bae2647d6ff93ec67fd0612193a3 (MD5) Previous issue date: 1953
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Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
… into fatigue under multiaxial stress, and also cumulative damage under uniaxial stress, are discussed in conjunction with the parameters relevant to the present experimental investigation. A biaxial fatigue machine is described which can subject thin wall tubes to combinations of fluctuating …
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Modeling Cumulative Damage to Flow Surfaces and Assessing its Impact on Wall Turbulence
The present effort investigated the influence of cumulative damage of an initially smooth surface on the statistical characteristics of wall turbulence. Singular value decomposition was employed to decompose a highly-irregular surface topography replicated from a turbine blade damaged by spallation …
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Applicability of linear analysis in probabilistic estimation of seismic building damage to reinforced-concrete structures
… been an effort to relate building response to damage. Because decision-makers typically consider human lives, property damage and cost, setting performance requirements in terms of the damage that a building is likely to sustain over time and its associated cost is more relevant to them. The …
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Environmental thermal stresses as a first passage problem
… Degradation of the barriers by aging and cumulative damage are incorporated in the analysis.
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Some studies in simultaneous failure in equipment items
… stress-strength relationships, and the theory of Cumulative Damage. By mathematical manipulation to suit the principles of Lagrange's Method of Undetermined Multipliers, an optimization model has been developed. This model enables system and component design constraints and requirements to be …
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Performance simulation of a composite orthopedic implant device
… with experimental data. A dynamic, mechanistic cumulative damage model that is capable of predicting the residual strength and life of a composite prosthesis under cyclic loading was also developed, based on a 'Critical Element Model' and the static strength models, and was transformed into an …
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Probabilistic service life prediction of composite viscoelastic cylindrical structure under random outdoor environment
… life was then obtained via the evaluation of cumulative hazard function. Models for the deterministic and random variations of environmental thermal loads- ambient temperature, sky radiation, wind convection, and solar radiation, were developed and were considered in obtaining the structure's …
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Mechanics of Fiber-Controlled Behavior in Polymeric Composite Materials
Modern durability and damage tolerance predictions for composite material systems rely on accurate estimates of the local stress and material states for each of the constituents, as well as the manner in which the constituents interact. In this work, an number of approaches to estimating the stress …
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Improving fatigue life predictions: theory and experiment on unidirectional and crossply polymer matrix composites
… applied stress on the critical element. Using a cumulative damage model, the complicated stress history of the critical element is reduced to a "critical element SN curve", which defines the fatigue response of the critical element. The residual strength of the critical element may then be …
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Investigating systemic effects of chronic stress on hepatic and cardiac tissue in female Wistar rats
… [SOD], catalase, and ORAC) and oxidative damage marker (malondialdehyde adducts) in whole-cell lysates and subcellular fractions. Autophagy-related proteins (p62, LC3B, Beclin-1, SNAP29, SOD1/2) were quantified by Western blotting. CRS induced mild oxidative damage restricted to cardiac …
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Analysis of laminated architectural glazing subjected to combined wind and debris impact loading
… studying the stress response, failure and damage analysis of rectangular laminated architectural glazing against combined wind and windborne debris impact. Here both small-hard (like roof gravel) and large-soft (like timber) windborne debris are considered. The stress response of the …
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Experimental Damage Diagnosis of a Model Three-Story Spatial Frame
Structural damage can be induced by a variety of events from short-term abnormal stresses to long-term natural aging. Detection of changes in a structure's ability to withstand subsequent loads can aid decisions on safety, repair, rehabilitation, and demolition. Dynamic property shifts can show …
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Floating production storage offloading unit structural fatigue analysis
… for fatigue life assessment using a linear cumulative damage formulation.
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The mechanical behaviour of polyethylene pipe systems
… experimental Nf values with those predicted from cumulative damage principles based on Nf=τSR/τmax. In all types of system, failure was initiated at a defect residual from processing or jointing. Over 95% of all small diameter pipe fractures originated from inclusions at or close to the inside …
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Application of Fatigue Theories to Seismic Compression Estimation and the Evaluation of Liquefaction Potential
… an alternative application of the Palmgren-Miner damage hypothesis, shifting from the existing high-cycle, low-damage fatigue framework to a low-cycle framework more applicable to liquefaction analyses. Seismic compression is the accrual of volumetric strains caused by cyclic loading, and …
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Tensile Fatigue Damage and Degradation of Random Short-Fiber Smc Composite
Fatigue damage and degradation in a random short-fiber SMC-R50 composite are investigated experimentally and theoretically. In the study of homogeneous damage, experiments were conducted to examine fundamental mechanisms and characteristics of fatigue damage and its evolution. The statistical …
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Homing and Differentiation of Mesenchymal Stem Cells in 3D In Vitro Models
… musculoskeletal disorder that occurs through cumulative damage to the extracellular matrix (ECM). Studies combining nanofibrous scaffolds and MSCs to determine an optimal topographical environment have promoted tenogenic differentiation under various conditions. We investigated cellular …
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