| Acquisition of a Nanoindenter for Research on Small-Scale Materials and Structures |
AUG 2003 |
6 pages |
| Authors:
Frank W. Zok; D. R. Clarke; N. C. MacDonald; Kimberly L. Turner; CALIFORNIA UNIV SANTA BARBARA DEPT OF MECHANICAL AND ENVIRONMENTAL ENGINEERING
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 | The first project is "Matrix Enabled Damage Tolerance in Oxide Continuous Fiber Reinforced Ceramic Composites", PIs: Frank Zok, Carlos Levi and Robert McMeeking, funded by AFOSR. Here, the nanoindenter is being used for measuring the mechanical properties of fiber-matrix interfaces, through the so- called "fiber push-in" test. In essence, the test involves pushing an individual fiber past the surrounding matrix while simultaneously measuring the sliding displacement at the fiber/matrix interface. ... |
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| Effect of hostile environments on adhesive joints II. |
JAN 70 |
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| Authors:
C. Kerr; N. C. MacDonald; S. Orman; GENERAL DYNAMICS SAN DIEGO CALIF CONVAIR AEROSPACE DIV
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 | The adverse effect of water on aluminum- epoxide bonds has been studied with respect to: the temperature and water vapor pressure of the exposure environment; the degree of cure of the adhesive; and the recoverability of the bond strength. The results confirm that water accumulation within the system is the disrupting entity. The current data indicate that hydrolysis of covalent bonds, rather than interference with hydrogen bonding, is the operative ... |
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| A COMPUTER-CONTROLLED SCANNING ELECTRON MICROSCOPE: THE BERKELEY SEM-I/IBM-1800 SYSTEM, |
20 DEC 1968 |
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| Authors:
N. C. MacDonald; P. Mueller; L. Snyder; CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB
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| A description is given of the additional equipment and computer programs necessary to connect an IBM 1800 computer to a scanning electron microscope (the Berkeley SEM-I). System operating procedures are discussed, and explanations and listings of the computer programs are given. Circuit diagrams and tables giving relationships among program variables, computer inputs-outputs, and controls on the console are presented. (Author) |
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| Composite Structures as High Strength, Light Weight Fillers, |
25 NOV 1964 |
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| Authors:
M. W. Holloway ; N. C. MacDonald
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| The use of aluminum, paper, and cellular plastics (foam) in care structures of composites was studied. Design principles are outlined. Composite core structures using high quality, high strength plate materials arranged as parallel members in the line of the applied load with low density spacers to prevent buckling have advantages over conventional low density structural materials. They are easily fabricated from inexpensive materials, and can be considered for a range ... |
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