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 10 of 10 for “"Steady State Creep"”.
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The variation of subgrain misorientation in aluminum with large steady-state creep strain
… boundaries remained constant over the range of steady-state strains examined. However, transmission electron microscopy in this work revealed that subgrain boundaries remained constant over the range of steady-state strains examined. However, transmission electron microscopy in this work …
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Torsional creep of tin at high temperatures
Steady-state creep data are presented for tin tested in torsion at temperatures from 1000C to 228°C. Results obtained below 210°C verify observations of other investigators. A creep activation energy of 22.5 Kcal/mol in this temperature range is determined. Above 210°C, an abnormal increase in the …
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Modelling to predict the reliability of solder joints
… review is presented covering analytical methods, creep laws and fatigue laws, and advanced damage mechanics methods. The use of FEA (Finite Element Analysis) to model creep along with a fatigue law to predict lifetime appears to be the most widely used and validated technique at present. The FEA …
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Dislocation -Obstacle Interactions in Aluminum Alloys
… dislocation-particle interactions during creep deformation, and dislocation-loop interactions during deformation at room temperature. Dislocation-particle interaction studies in Al-Zn-Mg-Cu-Zr, Al-4Mg-0.3Sc, and Al-0.3Sc showed that temperature, coherency, and particle size play a role in …
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Effect of dislocation substructure on the primary creep behavior of alpha titanium at elevated temperature
Constant stress creep tests were performed in vacuo on alpha titanium in various thermomechanical treatments. At 500°C and 527°C annealed alpha titanium exhibits an anomalous creep arrest in the initial portion of the creep curve. After this creep arrest the creep curves swept up to a true steady …
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Reactive infiltration processing and compression creep of NiAl and NiAl composites
… NiAl. The high-temperature uni-axial compression creep behavior of uni-directionally reinforced continuous fiber composite materials was investigated using NiAl-W as a model system for the case where both the NiAl matrix and the W fiber underwent plastic deformation by creep. The creep behavior of …
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Durability of Ceramic Matrix Composites at Elevated Temperatures: Experimental Studies and Predictive Modeling
… on a micromechanical analysis of the stress state in a fiber near a matrix crack and includes the effects of fiber pullout and global load sharing from broken to unbroken fibers. The parameters required to produce the deformation and lifetime predictions can all be obtained independently of …
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Strain rate and temperature dependent mechanical behavior of nanocrystalline gold
… at nominally elastic loads that lead to creep strain over a moderate temperature range that is relevant to MEMS applications. The rate dependent mechanical behavior of nanocrystalline Au thin films was first investigated at room temperature and at strain rates between 10-6 to 20 s-1. The …
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Finite Element Analysis of a Shaft-Rotor System
The United States Air Force is in the process of developing a more electric aircraft. The development of an aircraft Integrated Power Unit and an Internal Starter/Generator will be instrumental in producing sufficient electrical power to run all non propulsive systems. Iron-cobalt alloys, such as …