| Society of Engineering Science 35th Technical Annual Meeting held at Washington State University, Pullman, Washington during the period Sept 27-30, 1998 |
SEP 1998 |
256 pages |
| Authors:
Hussein M. Zbib; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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 | The Society of Engineering Science (SES) 35th Technical Annual meeting was held on the campus of Washington State University in Pullman, Washington during the period Sept 27-30, 1998. The main objective of the conference was to provide a forum for discussion and dissemination of recent advances in research, development and education, covering topics from all areas of engineering science. The SES98 consisted of 25 symposia composed of 110 sessions. A ... |
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| Vortex Dynamics and Separation Over Pitching Wings |
31 AUG 95 |
74 pages |
| Authors:
B. R. Ramaprian; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This project, aimed at an extensive study of the unsteady vortex dynamics and separation of pitching wings. Significant accomplishments were made in the project. These included extensive documentation of the 2-D velocity and vorticity field around a pitching NACA 0015 wing at a Reynolds number of 150, 000, and extensive surface pressure and velocity data in the 3-D flow over a pitching swept wing of the same profile. The velocity ... |
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| Deformation and Fracture Mechanisms in Thin Films and Beryllium Intermetallics |
20 JUN 95 |
6 pages |
| Authors:
richard g. hoagland; John F. Hirth; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| The overall goal of this program was to investigate the mechanical properties of several Be intermetallics for the purpose of evaluating their suitability for high temperature structural applications. This program enabled the completion of research on the fracture toughness of thin films and the deformation behavior of Be12X compounds. The grant enabled the extension of previous thin film work to include tests of thin brittle films on elastic- plastic substrates ... |
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| Interactions of Spanwise and Chordwise Vorticity Associated with Three- Dimensional Dynamic Stall Over an Oscillating Wing |
15 OCT 94 |
19 pages |
| Authors:
B. R. Ramaprian; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This is the final report on the experimental research performed under U.S. Army Research Office Grant No. DAAL 03-91-0026, with Dr. Thomas Doligaiski as the Technical Program Manager. The Principal Investigator was B.R. Ramaprian. The research work involved the measurement of the pressure and velocity fields in the three-dimensional flow field surrounding and in the wake of the tip region of a rectangular wing of NACA 0015 profile. Measurements were ... |
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| A Comparative Study of Existing and Newly Proposed Models for Creep Deformation and Life Prediction of Si3N4. |
1994 |
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| Authors:
Jow-Lian Ding; Kenneth C. Liu; Charles R. Brinkman; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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 | This paper summarizes recent experimental results, obtained at Oak Ridge National Laboratory (ORNL), on creep behavior and creep rupture of a commercial grade of Si3N4 ceramic in the temperature range of 1150 C to 1300 C. A uniaxial model capable of describing the behavior under general thermomechanical loading is introduced and compared with existing models. An exploratory extension of the new model to a multiaxial form is then discussed. Issues ... |
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| The Interface Ring Dislocation in Fiber-Matrix Composites: Approximate Analytical Solution. |
1994 |
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| Authors:
I. Demir; H. M. Zbib; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, analytical, composite materials materials and material types:, fibers miscellaneous and special technical terms:, dislocation models, interfacial dislocations, interfacial ring dislocations, interfacial somigliana ring dislocations, models, mss-9302327 grants. |
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| Fracture Toughness of Al-4 Percent Mg/Al2O3p Composites. |
1994 |
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| Authors:
R. H. Pestes; S. V. Kamat; J. P. Hirth; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| Fracture toughness tests were carried out on al-4%mg/al2o3(sub p) composites containing different sizes and volume fractions of alumina particulates. the results indicated that the fracture toughness was dependent of the interparticle spacing provided the particulate size was below a critical size. the critical particle size corresponds to the situation wherein the energy release rate on particulate cracking is sufficient to trigger dynamic unstable crack extension. keywords:, data, dr mmc, mmc, ... |
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| An Experimental Study of Wing Tip Vortex in the Near Wake of a Rectangular Wing |
JUN 93 |
209 pages |
| Authors:
Youxin Zheng; B. R. Ramaprian; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| An experimental study of the tip vortex behind a NACA 0015 rectangular wing of aspect ratio 4 was carried out to understand the structure and evolution of the vortex in the near-wake region. The results of these experimental studies are presented in this report. These measurements were made nonintrusively using three-component laser-Doppler velocimetry (LDV). The experiments were carried out at a Reynolds number of about 180,000 in a low- speed ... |
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| Mixed Mode I/III Fracture Toughness of 2034 Aluminum Alloys |
1993 |
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| Authors:
Xiaoxin Feng; A. M. Kumar; J. P. Hirth; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| A study of the mixed mode i and iii fracture resistance of four 2034 aluminum alloys with varying manganese content is presented in this paper. the mixed mode fracture tests are carried out using modified compact tension specimens. as there is no standard test method for mixed mode fracture, special formulations of the j integral are used to characterize the mixed mode fracture resistance. the results indicate that the overall ... |
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| Deformation Enhanced Grain Growth in a Two Phase Titanium Alloy. |
1993 |
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| Authors:
S. Richter; C. H. Hamilton; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This study addresses the grain growth behaviour of a titanium, 6% aluminum, 4% vanadium (Ti-6Al-4V) alloy in relation to its super-plastic formability. It has been observed that, while an alloy's microstructure will coarsen when exposed to elevated temperatures, this coarsening is accelerated if a slow deformation process is imposed, such as superplastic deformation. This deformation-enhanced grain growth affects the forming process and may be beneficial or undesirable depending on details ... |
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| The Development of Computational Methods of Adhesion and Adhesive Science and Technology |
08 JUL 92 |
13 pages |
| Authors:
William E. Johns; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| The development of computational methods for describing the adhesive process was explored. Serious problems currently face the adhesive technologist in that some of the best models for understanding adhesion, i.e. Lewis acid/base neutralization reactions, are based on empirical methods. It was thought that computational methods may show a way for addressing this and provide a first principle basis for understanding adhesion. Current limitations in software, and computer hardware do not ... |
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| Synthesis of a MoSi2/SiC Composite In Situ Using a Solid State Displacement Reaction. |
1992 |
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| Authors:
C. H. Henager Jr.; J. L. Brimhall; J. P. Hirth; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| Solid state displacement reactions are being studied at Pacific Northwest Laboratory (PNL) as a method of synthesizing intermetallic and ceramic composites in situ. A high-strength in situ composite of MoSi2/SiC was synthesized using a solid state displacement reaction between Mo2C and Si. Diffusion couples between Mo2C and Si processed at 1200 C revealed the formation of aligned SiC platelets in a MoSi2 matrix. In situ composites were also synthesized by ... |
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| Combined Mode I - Mode III Fracture Toughness of Alumina Particulate-Reinforced Aluminum Alloy-Matrix Composites. |
1989 |
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| Authors:
S. V. Kamat; J. P. Hirth; R. Mehrabian; WASHINGTON STATE UNIV PULLMAN DEPT OF MECHANICAL AND MATERIALS ENGINEERING
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, data, dr mmc, mmc, mmc data materials and material types:, (al2o3)p/al, al matrix, al2o3 particulates, al2o3/al, particulates material characteristics and data fields:, fracture toughness data, mode i, mode iii, stress intensity factors testing and test conditions:, fracture analysis, fracture toughness tests, sem, tensile tests manufacturing:, edm miscellaneous and special technical terms:, ... |
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