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On the early initiation of fatigue cracks in the high cycle regime

On the early initiation of fatigue cracks in the high cycle ...

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12th International Conference on Fracture 2009, ICF-12

作者： Ishihara, S. McEvily, A.J. Dept. of Mechanical Engineering Univ. of Toyama Toyama Japan Dept. of Materials Science and Engineering Univ. of Connecticut CT United States

ISBN: (纸本)9781617382277

A series of replicas taken periodically throughout the fatigue lifetime has been used to determine the fraction of lifetime in the high cycle range at which a fatigue crack can be first identified. For the alloys investigated this fraction is less than 10% of the fatigue lifetime. The replicas also provide a record of crack length as a function of the number loading cycles, and this information has been used to compare the crack length with predictions based upon a basic constituitive relationship. Good agreement between the experimental results and the predictions was obtained.

关键词： Alloys

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Nano-enhanced aerospace composites for increased damage tolerance and service life damage monitoring

Nano-enhanced aerospace composites for increased damage tole...

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Sensors and Smart Structures Technologies for Civil, mechanical, and Aerospace Systems 2009

作者： Paipetis, A. Matikas, T.E. Barkoula, N.M. Karapappas, P. Vavouliotis, A. Kostopoulos, V. Materials Science and Engineering Dept. University of Ioannina 45110 Ioannina Greece Mechanical Engineering and Aeronautics Dept. Applied Mechanics Laboratory University of Patras 26500 Patras Greece

ISBN: (纸本)9780819475527

This study deals with new generation composite systems which apart from the primary reinforcement at the typical fiber scale (~10 μm) are also reinforced at the nanoscale. This is performed via incorporation of nano-scale additives in typical aerospace matrix systems, such as epoxies. Carbon Nanotubes (CNTs) are ideal candidates as their extremely high aspect ratio and mechanical properties render them advantageous to other nanoscale materials. The result is the significant increase in the damage tolerance of the novel composite systems even at very low CNT loadings. By monitoring the resistance change of the CNT network, information both on the real time deformation state of the composite is obtained as a reversible change in the bulk resistance of the material, and the damage state of the material as an irreversible change in the bulk resistance of the material. The irreversible monotonic increase of the electrical resistance can be related to internal damage in the hybrid composite system and may be used as an index of the remaining lifetime of a structural component. © 2009 SPIE.

关键词： Carbon nanotubes

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Crystal growth and magnetic reversal mechanism in ferromagnetic nanowire by chain of prolate spheroids model

Crystal growth and magnetic reversal mechanism in ferromagne...

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materials science and Technology Conference and Exhibition 2009, MS and T'09

作者： Wang, P. Gao, L. Song, X. Yang, S. Wang, L. Murakami, R. Dept. of Materials Physics School of Science Xi'an Jiaotong University Xi'an China Dept. of Mechanical Engineering University of Tokushima Tokushima Japan

ISBN: (纸本)9781615676361

Ferromagnetic nanowire arrays were fabricated into the nanoscale pores of anodic aluminum oxide template using an alternate current electrodeposition method. The nanowires grew from the bottom to top of the pore by chemical reduction deposition. The microstructures of the nanowires were observed as complete single crystalline structure and the subsequent nanowires for different materials grew with special oriented directions. For body-centered cubic Fe nanowires the growth direction is along , and for face-centered cubic Ni nanowres the growth direction is along respectively. The growth of nanowires was considered as a restricted growth model because of the narrow holes environment. The magnetic hysteresis loops were measured by vibration sample magnetometer system from 0 to 10000 Oe. The magnetic reversal mechanism and the maximum coercivity for nanowires arrays were discussed and calculated respectively according to a chain-of-spheres model. The magnetic nanowire arrays are considered have the applications prospects in high density magnetic recording media and high sensitive magnetic sensors.

关键词： Nanowires

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The effect of aerodynamic asymmetries on turbomachinery flutter

The effect of aerodynamic asymmetries on turbomachinery flut...

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作者： Ekici, Kivanc Kielb, Robert E. Hall, Kenneth C. Dept. of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville TN 37996-2030 United States Dept. of Mechanical Engineering and Materials Science Duke University Durham NC 27708-0300 United States

ISBN: (纸本)9781563479694

In this paper, the effect of aerodynamic asymmetries on the flutter characteristics of turbomachinery blades is investigated. Specifically, the present method is used to study the effect of leading edge blending in loaded and unloaded rotors. The unsteady aerodynamic response of the blades to self-excited vibrations is modeled using a harmonic balance method, which allows one to model the entire wheel using complex periodic boundary conditions and a computational grid spanning a single sector (symmetry group). This reduces the computational and memory requirements dramatically compared to similar time-accurate analyses. It is shown that alternate blending degrades the stability of a loaded rotor whereas it improves the stability of an unloaded rotor. On the other hand, when blends are spaced five blades apart their effect is less pronounced. Copyright © 2009 by Kivanc Ekici, Robert E. Kielb, and Kenneth C. Hall.

关键词： Flutter (aerodynamics)

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Harmonic balance analysis of forced response in a transonic compressor

Harmonic balance analysis of forced response in a transonic ...

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作者： Ekici, Kivanc Hall, Kenneth C. Kielb, Robert E. Dept. of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville TN 37996-2030 United States Dept. of Mechanical Engineering and Materials Science Duke University Durham NC 27708-0300 United States

ISBN: (纸本)9781563479694

A harmonic balance technique for the analysis of nonlinear forced response phenomenon in a two-row transonic compressor is presented. Using the present approach, each blade row is modeled using a computational grid spanning a single blade passage regardless of the the actual blade counts. In the harmonic balance analysis several sub-time level solutions that span a single time-period are stored. These sub-time level solutions are related to each other through the time derivative term, which is approximated by a pseudo-spectral operator in the governing equations, and through boundary conditions. The complex periodicity conditions connect the sub-time levels within a blade passage, and inter-row boundary conditions connect the solutions among blade rows. Because of the fact that the resulting discretized equations are mathematically steady, the flowfield can be solved very efficiently using multi-grid acceleration and local time-stepping techniques. In this paper, we apply the harmonic balance technique to an inlet guide vane (IGV) and rotor interaction problem and illustrate that quite accurate solutions can be obtained very efficiently. Copyright © 2009 by Kivanc Ekici, Kenneth C. Hall, Robert E. Kielb.

关键词： Boundary conditions

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Fracture induced by cold rolling in metal/polymer composites

Fracture induced by cold rolling in metal/polymer composites

引用

SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2009

作者： Calcagno, Barbara O. Rinaldi, Carlos Osswald, Tim A. Crone, Wendy C. Materials Science Program University of Wisconsin Madison WI United States Chemical Engineering Dept. University of Puerto Rico-Mayaguez Puerto Rico Mechanical Engineering Dept. University of Wisconsin Madison WI United States Engineering Physics Dept. University of Wisconsin Madison WI United States

ISBN: (纸本)9781615671892

Metal inclusions in polymeric composites exhibit different fracture patterns under a process of calendering, i.e. cold rolling and folding. Combinations of NiTi and Ti inclusions were used in polypropylene, polycarbonate, and high density polyethylene. Fundamental aspects to the process of calendering/rolling dissimilar materials are the deformation and fracture behavior of constituents with different stiffness and fracture strength, the interface adhesion, the load transfer between composite constituents, and the pressure and shear stress profiles at the interface. Experiments were conducted to identify the process parameters required to induce fracture in the metal/alloy inclusion on the first rolling pass. Dimensional analysis showed a logarithmic relation between composite stretch and a dimensionless nip gap parameter related to the gap between the rollers. ©2009 Society for Experimental Mechanics Inc.

关键词： Binary alloys

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Increase of heat transfer to reduce build time in Rapid Freeze Prototyping

Increase of heat transfer to reduce build time in Rapid Free...

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20th Annual International Solid Freeform Fabrication Symposium, SFF 2009

作者： Leu, Ming C. Isanaka, Sriram P. Richards, L. Dept. of Mechanical and Aerospace Engineering Missouri University of Science and Technology Rolla MO 65409 United States Dept. of Materials Science Engineering Missouri University of Science and Technology Rolla MO 65409- 0330 United States

Reduction of part build time in the Rapid Freeze Prototyping (RFP) process, which fabricates a 3D ice part layer-by-layer by depositing and freezing water droplets, has been achieved by increase of heat transfer. Three mechanisms have been experimentally investigated: 1) cooling the substrate, 2) use of forced convection, and 3) use of a chilling plate. Cooling the substrate is effective for parts of small heights but becomes ineffective with increase in part height. Forced convection produced desirable reduction in part build time but with the undesirable formation of frost on the built ice part. The use of chilling plate to increase heat conduction proved to be most effective. To ensure that the frozen ice from the deposited water can be easily removed from the chilling plate, various surface coats were investigated and the most effective surface coat was found to be a thin Teflon film. After incorporating the chilling plate we have successfully achieved 75% reduction in part build time.

关键词： Ice

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Fabrication and characterization of squeezed cast aluminum matrix composites containing boride reinforcements

Fabrication and characterization of squeezed cast aluminum m...

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materials science and Technology Conference and Exhibition 2009, MS and T'09

作者： Olaya-Luengas, L. Estremera-Pérez, E. Suárez, O.M. Dept. of Mechanical Engineering University of Puerto Rico Mayagüez PR Puerto Rico Dept. of Engineering Science and Materials University of Puerto Rico Mayagüez PR Puerto Rico

ISBN: (纸本)9781615676361

Aluminum alloys containing 2 and 4 wt.% copper reinforced with aluminum borides were successfully fabricated by squeeze casting employing squeezing pressures up to 62 MPa. The distribution of reinforcements in the composites was measured and the effect of pressure on density and hardness of the composites was determined. The pressure effect on the squeezed composites was investigated by optical microscopy, Vickers microhardness testing and superficial Rockwell hardness testing. Higher applied pressures increased the squeezed castings density and the shrinkage porosity was practically eliminated. The composite superficial hardness was improved by increasing the applied pressure upon squeeze casting. Finally, the indirect squeeze cast technique caused Al 2Cu phase segregation to upper regions of the specimens;on the other hand, the AlB12 reinforcement segregated preferentially at lower regions of the specimen.

关键词： Microhardness

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Improving a turning process using piezoelectric actuators

Improving a turning process using piezoelectric actuators

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27th Conference and Exposition on Structural Dynamics 2009, IMAC XXVII

作者： Radecki, Peter P. Kruse, Walter A. Welsh, Aaron J. Moro, Erik A. Park, Gyuhae Bement, Matthew T. Dept. of Mechanical Engineering Michigan Technological University United States Dept. of Mechanical Engineering New Mexico Institute of Mining and Technology United States Dept. of Materials Science and Engineering Pennsylvania State University United States Engineering Institute Los Alamos National Laboratory Los Alamos NM 87545 United States

ISBN: (纸本)9781605609614

An adaptive vibration control technique for improving surface finish is explored. In some cases, additional processing to improve surface finish quality after machining, such as grinding or polishing, is either not feasible or is not cost-effective. The focus of this research is on the development of an improved turning processes through the use of active vibration damping. Demonstration of the tool holder shows reduced relative tool-workpiece vibration and improved surface finish. The toolholder employs a high bandwidth piezoelectric actuator and collocated piezoelectric displacement sensor, with an adaptive positive position feedback control algorithm for vibration control and chatter reduction. The performance of this method is evaluated by comparing the surface finishes obtained with active vibration control versus baseline uncontrolled cuts. Surface finish roughness was measured using profilometry gages. Considerable improvement in surface finish and reduction in chatter amplitude are observed analyzed for applications in modern day machining. © 2009 Society for Experimental Mechanics Inc.

关键词： Piezoelectric actuators

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Effect of shot-peening on the rotating bending fatigue strength of the high Si hard drawn-wire to which the small defect was given 17

Effect of shot-peening on the rotating bending fatigue stren...

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17th International Federation for Heat Treatment and Surface engineering Congress 2008, IFHTSE 2008

作者： Nanbu, Koichiro Saruki, Katsushi Egami, Noboru Kondo, Satoru Major of Mechanical Engineering Postgraduate Course in Science and Engineering Meijo University Aichi468-8502 Japan Department of Materials Science and Engineering Faculty of Science of Engineering Meijo University Aichi468-8502 Japan Department of Mechanical Engineering Faculty of Science of Engineering Meijo University Aichi468-8502 Japan Engineering Dept. R AndD Sec Togo Seisakusyo Corp Aichi470-0162 Japan

In this study, the decreasing rate of fatigue strength by the directionality of a notch and the betterment effect of the fatigue strength by a shot-peening were examined. The straight notch with a notch angle of 30 -90 ° was given to the specimen, and the rotating bending fatigue test was carried out. As a result, in the case of 90° , it fractured at the notch, and the fatigue limit was reduced 14%. In the case of 60 ° or less, it fractured from the outside of notch with stress of near the fatigue limit, and the fatigue limit was equivalent to the plain wire. However, in the case of the oil tempered wire without remarkable drawn structure, the fatigue limit became decreased as the notch angle became large. This fact shows that the high Si hard drawn-wire with a notch angle of 60 ° or less did not fractured at a notch by the effect of drawn structure. When shot peening process was performed after giving the notch, the fatigue limit was higher than the untreated wire. This showed that a shot peening process was effective in the improvement of the decrease of the fatigue strength by a small defect.

关键词： Shot peening

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