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Showing 1 to 20 of 28 for “"Cyclic stress"”.
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Cyclic stress-strain behavior of sand in offshore environment.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Civil Engineering.
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An Analysis of Cyclic Stress Behavior for Conditions of Controlled Strain
Made available in DSpace on 2014-12-04T23:10:57Z (GMT). No. of bitstreams: 1 0025256.pdf: 3298323 bytes, checksum: b1f7dc34fc4ddad0cce2c9393728ae8d (MD5) Previous issue date: 1957
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An Experimental Determination of the Effect of Cyclic Stress on Void Growth in Ultra-High-Purity Aluminum During Simultaneous 800 Mev Proton Irradiation
Conditions of radiation and a simultaneous cyclic stress are inherent in advanced energy system designs, including magnetically and inertially confined controlled thermonuclear fusion reactors (CTR). Walter Green and Johannes Weertman (G & W) had predicted that edge dislocations, set into …
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Stability of tunnels in water saturated shale under cyclic stresses: investigation on the coupling between mechanical and seepage characteristics
Under the coupled effect of water and cyclic stress, the mechanical properties of mine surrounding rock deteriorate, and its permeability changes, posing challenges to tunnel excavation support and mine stability control. The interaction between water infiltration into the rock mass and externally …
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A critical analysis of fatigue-crack propagation data for 2024-T3 aluminum.
… to a given crack length when applied to multiple cyclic stress ratios. An alternative approach was developed, based on the observed data, which is applicable to analog or digital fatigue-crack growth prediction. Data acquisition based on constant increment of crack length has been found to yield …
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Some aspects of crack initiation in mild steel subjected to fatigue stressing in a corrosive environment
… the application of both static and compressive stresses enhance anodic dissolution. Application of cyclic stress assists the breakdown of the surface film resulting in localised attack, Metallographic studies indicate that a sulphur enriched band of ferrite exists around the non-metallic …
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Computational study of compact tension and double torsion test geometries
… of many engineering components subjected to cyclic or repetitive loading,fatigue is an ever-present challenge. The engineer often endeavors to design the structural or component system in such a way that the cyclic stresses are below a particular fatigue limit, or, in fracture mechanics …
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On the Effect of Hydrogen on the Mechanical Behavior of Beta-C Titanium in Aged Condition
The cyclic stress strain behavior was not affected by hydrogen; the non-linear elastic behavior and the cyclic softening did not change with introduction of hydrogen up to a level of 10.8 at%. The fatigue life was, however, reduced when hydrogen charged samples were tested at low frequency (0.00032 …
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Stress-strain behaviour of granular soils under monotonic and cyclic loading conditions
The stress-strain behaviour of granular soils under monotonic and cyclic loading conditions and small lateral strains was studied in this work. A simple cubic triaxial apparatus (SCTA), originally developed at Leeds University for monotonic stress-strain studies of sand under controlled and small …
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Nonproportional biaxial fatigue of welded joints
… for a tube-to-plate specimen to simulate cyclic stress states typical of highway bridge beams subjected to a single passage of a vehicle.
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Assessment of the Cyclic Strain Approach for the Evaluation of Initial Liquefaction
… liquefaction evaluation procedures include the stress-based, strain-based, and energybased based approaches. The existence of a volumetric threshold shear strain, γtv, under which there is no development of excess pore pressures, and the unique relationship between pore pressure ratio and cyclic …
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A study of crack initiation in corrosion-fatigue of A.I.S.I 316 stainless steel by dynamic measurement of corrosion characteristics and corrosion current transients
… corrosion current transients, in phase with a cyclic stress. applied in reverse bending at 24 Ez to AISI 316 stainless steel plate immersed in selected aqueous media. The amplitude and waveform of this fluctuating current component, together with the measurement of the corrosion characteristics …
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Liquefaction Susceptibility of Uncemented Calcareous Sands From Puerto Rico by Cyclic Triaxial Testing
… consolidated undrained monotonic and cyclic triaxial tests were performed using the Playa Santa sand from Porto Rico. Playa Santa sand is a poorly graded calcareous clean beach sand composed of angular particles with large intra-granular voids. A series of consolidated undrained …
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Biocementation of Road Foundations: Element Testing, Physical Modelling, and Micro-Scale Characterisation
… biocemented aggregates. The observed changes in stress-strain responses, strength and stiffness evolution, and stress dilatancy are consistent with those reported for biocemented and conventionally cemented soils. The relatively low cementation levels used effectively rectified the deficient …
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Multiaxial fatigue damage model for random amplitude loading histories
… analysis incorporating the multiaxial state of stress is conducted along a critical orientation assuming a constant strain ratio. The dominant deformation direction is chosen to be the critical orientation which is selected with the help of a principal strain histogram generated from the given …
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Post processing of cone penetration data for assessing seismic ground hazards, with application to the New Madrid seismic zone
… Zone (NMSZ). For liquefaction evaluation, the cyclic stress ratio (CSR) is computed using site response analysis by DeepSoil and a measured profile of shear waves derived from the 30-m SCPTU soundings and deep suspension loggings in AR and TN. The natural resistance of the soil to liquefaction, …
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Corrosion fatigue initiation in stainless steels : The scanning reference electrode technique.
… role played by corrosion pits, which can act as stress concentrators and promote fatigue crack nucleation. SRET measurements conducted during the potentiostatic generation of pits on the austenitic stainless steels in artificial seawater showed that the pit current density increases with the time …
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A theoretical approach to the prediction of haemolysis in centrifugal blood pumps
… trauma which is primarily caused by hydrodynamic stresses. A general mechanical blood damage theory was developed which comprises a combination of the information about mechanical loading of blood with the knowledge of its resistance properties. In this theory arbitrary loading-time functions are …
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Liquefaction behavior and dynamic properties of loessial (silty) soils
… has been made to ascertain the liquefaction (cyclic strength) behavior of loessial (silty) soils. No information on the mechanism governing the behavior of these soils under cyclic loads was previously available. This study is important in view of the seismicity of the mid-western region and …
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Fatigue and fracture behaviour of PVC at elevated temperatures
… tests consisted of externally and symmetrically stressing, across the diameter, sections of pipe from the luxury Madinat Jumeirah resort in Dubai where the failures had occurred. The Paris equation generating FM tests used Compact Tension specimens and produced an equation relating the crack …
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