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Correction of mean standard deviation (σ). Proposed correction Svensson–Lorén correction Dixon–Mood mean. Comparison of Dixon–Mood, Svensson–Lorén correction, and proposed correction for N = 20 specimens.. Of course, there will be estimates for standard deviation which are both higher and lower than the mean, and these estimates will not be corrected to the true value using this correction. Compared to both...
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comparisons provide some useful information concerning the capabilities and accuracy of the Fs approach. In all cases, the predicted threshold stress levels exceeded the experimental values. However, the differences between the actual and modeled notch dimensions may have contributed to the discrepancies to some degree. This would increase the effective stress concentration factor, thereby reducing the nominal threshold stress level....
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Solving for pressure in CAPRI (the solver developed for similar materials in Purdue) involves finding the correct (a, e) pair corresponding to the applied force and moment.. Fourier decompositions like the one in Equation (F.15) can be done very rapidly using the discrete sine-transform.. the size and eccentricity of the stick zone is unknown a priori. Depending on the value...
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Figure F.5 shows that the CARTEL solution (finite thickness) approaches the CAPRI solution (half-space) for a thickness where the thickness to contact length ratio b/a is greater than 5. Hills, D.A., Nowell, D., and Sackfield A., Mechanics of Elastic Contacts, Kluwer Academic Publishers, 1992.. Murthy, H., Harish, G., and Farris, T.N., “Efficient Modeling of Fretting of Blade/Disk Contacts Including Load...
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Figure G.11. The distribution of k t is given in Figure G.14 [5]. The impact event leading to the damage site often resulted in non-propagating cracks, as shown in Figure G.15. Figure G.12. Figure G.13. Figure G.14. Figure G.15. The biggest benefit of the microscopic investigation was the identification of impact sur- face details that indicated the angle of incidence....
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Figure G.22. Figure G.23. The microstructural changes, aside from the scale of damage, were consistent for all specimens. Figure G.24. As can be seen from Figure G.24, their orientation is such that they could increase the susceptibility to fatigue crack growth.. Figure G.25 is a back-scattered electron image showing an area of the edge of a V-notch produced by firing...
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0.22 mm 0.96 mm. 0.40 mm 0.18 mm. 1.00 mm 0.33 mm. 0.36 mm 0.12 mm. 0.27 mm 0.39 mm. Figure G.34. The failure of the fine mesh to better predict material failure indicates that advanced codes such as hydrocodes and Particle-In-Cell (PIC) methods require significant expertise in order to be used correctly. In this case, the poor predictions may...
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residual stresses assumed present in ballistic and solenoid simulated FOD with compressive zone of 0.004 inches. First, assume an FOD event has occurred on the leading edge of a blade resulting in a notch with a depth of 0.3 mm (0.012 in). The notch has a root radius of 0.06 mm (0.0024 in.) and does not have a crack emanating...
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Blades insufficiently designed for FOD considerations have caused In-Flight Shut Downs (IFSDs) and costly damage to the engine. FOD tolerance can be enhanced by use of more damage tolerant materials and a redistribution of the blade mass.. The requirements of 3.3.2.2 shall be verified by:. “Simulated foreign object damage shall be applied to the (a) critical stage blades at one...
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Following the post-test performance check, the engine shall be disassembled to determine the extent of sand erosion, and the degree to which sand may have entered critical areas in the engine.. The recommended text decreases the operational time in the extreme sand and dust environment from ten hours to two hours for turbofan and turbojet engines. Engine contractors have been...