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Articles 781 - 790 of 790
Full-Text Articles in Engineering
Comparison Of Theoretical And Experimental Results Pertaining To R-Curves In Low And High Ductility Solids, Rabindra Nath Dash
Comparison Of Theoretical And Experimental Results Pertaining To R-Curves In Low And High Ductility Solids, Rabindra Nath Dash
Electronic Theses and Dissertations
Existing linear elastic fracture mechanics and J-integral analyses are well suited for safety assessments of high-strength, low-toughness materials. These analyses apply only to the onset of crack growth, which is usually tantamount to crack instability and structural failure in that class of materials. However, this is not the case for the low-strength, high-toughness materials in which crack instability may be preceeded [sic] by extensive stable crack growth under rising loads. Here, a substantial margin of safety may exist even when the onset of crack growth is imminent. This thesis describes research leading to a ductile fracture-mechanics methodology designed to treat …
Long-Term Retention Of Tritium In Man, Chin-Jen Ou
Long-Term Retention Of Tritium In Man, Chin-Jen Ou
Electronic Theses and Dissertations
[No abstract provided.]
Experimental Study On Viscoelastic Properties And Fracture Characteristics In Polymers, Debaranjan Mohanty
Experimental Study On Viscoelastic Properties And Fracture Characteristics In Polymers, Debaranjan Mohanty
Electronic Theses and Dissertations
The research reported in this thesis is undertaken with the following objectives:
1. To determine the viscoelastic properties of polymers on creep test under constant load;
2. To determine the internal friction (loss factor) of polymers under periodic loading condition;
3. To determine the delayed time or life time on fracture of the polymer under constant loading ; and
4. To verify the relationship, theoretically predicted, between the time to fracture and the material characteristics of the polymer with experimental observations.
Experimental Investigation Of Shock Boundary Layer Interaction For Two-Dimensional And Axisymmetric Flow, A. Shawki Zahran
Experimental Investigation Of Shock Boundary Layer Interaction For Two-Dimensional And Axisymmetric Flow, A. Shawki Zahran
Electronic Theses and Dissertations
A supersonic wind-tunnel has been constructed using an 8 inch by 10 inch single stage jet vacuum ejector with a capacity of handling 0.4 lb/sec air at 4 inches Hg absolute suction pressure. A Toepler Schlieren system with 10-inch diameter parabolic mirrors has been set up for flow pattern visualization. The same apparatus was developed to obtain multi-colored views of the flow pattern. That was accomplished by placing an equilateral prism in front of the light source located at the focal plane of the first parabolic mirror. A spectrum was thus produced at the focal plane of the second parabolic …
I. Improved Ice Meltage In Ice Boxes; Ii. Temperature Control In Tents - Winter Phase., Robert Beaman Duggan
I. Improved Ice Meltage In Ice Boxes; Ii. Temperature Control In Tents - Winter Phase., Robert Beaman Duggan
Electronic Theses and Dissertations
This thesis consists of two parts: Improved Ice Meltage in Ice Boxes; Temperature Control in Tents - Winter Phase. Improved ice meltage in the Progress refrigerator is discussed in the first part of the thesis. This portion of the work shows that satisfactory refrigerator temperatures and flat ice meltage could not be obtained simultaneously when using V-shaped ice racks, although they could be obtained separately; however, the basket-type chamber offers greater possibilities of obtaining proper temperatures and meltage characteristics. Series of tests are discussed and conclusions drawn from the results. In the second part of the thesis, a method of …
Stress Analysis By Photoelastic Methods, Herald K. Palmer
Stress Analysis By Photoelastic Methods, Herald K. Palmer
Electronic Theses and Dissertations
The object of this article is to point out how the principles of photo elasticity may be used as a basis for the analysis of stresses in machine parts. It is also to review the methods and demonstrate the procedure for the determination of the characteristics and values of stresses in the models of the parts studied.
Temperature Relationships In Tent Structures., Earl Robert Gerhard 1922-
Temperature Relationships In Tent Structures., Earl Robert Gerhard 1922-
Electronic Theses and Dissertations
No abstract provided.
The Effect Of Pigments On Oleoresinous Film Structure., Glenn Robert Eudaley 1920-
The Effect Of Pigments On Oleoresinous Film Structure., Glenn Robert Eudaley 1920-
Electronic Theses and Dissertations
No abstract provided.
The Effects Of Temperature And Pressure Variation On The Process Of Cooking Foods, Benjamin M. Aldrich
The Effects Of Temperature And Pressure Variation On The Process Of Cooking Foods, Benjamin M. Aldrich
Electronic Theses and Dissertations
It is generally known that water has a definite boiling temperature for each pressure to which its surface is subjected and that wet steam generated in a closed vessel maintains a definite temperature-pressure relation. Under each condition of temperature and pressure the steam contains a fixed amount of available energy stored as heat and called, "Heat Content" the value of which is usually based upon an arbitrary zero fixed a 32 degrees F., the freezing temperature of water under one atmosphere of pressure.
Discrepencies Of Theory As Against Empirical Results Of Critical Speeds Of Circular Cross Sectioned Shafting, Vern Kilpatrick
Discrepencies Of Theory As Against Empirical Results Of Critical Speeds Of Circular Cross Sectioned Shafting, Vern Kilpatrick
Electronic Theses and Dissertations
The scope of this thesis included computations and tests showing the first critical speeds of two shafts each 5/8" dia x 38" long one of C.R.S. and one of hard drawn brass. The purpose was to find and tabulate the discrepancies between the computed values for the critical speeds and the empirical values for critical needs.