Properties of Filamentary-Reinforced Composites at Cryogenic Temperatures

2009 ◽  
pp. 586-586-26 ◽  
Author(s):  
MB Kasen
Keyword(s):  
Reinforced Composites ◽  
Cryogenic Temperatures

Composites

1983 ◽  
pp. 413-463
Author(s):  
M. B. Kasen
Keyword(s):  
Composite Materials ◽  
Low Pressure ◽  
Concrete Aggregate ◽  
Reinforced Composites ◽  
Cryogenic Temperatures ◽  
Laminate Composites ◽  
Materials Properties ◽  
Cryogenic Technology ◽  
Composite Systems ◽  
Effects Of Radiation

Abstract Composite systems for cryogenic applications are discussed in this chapter. This chapter emphasizes filamentary-reinforced composites because they are the most widely used composite materials. It begins with a discussion on the approach to designing and fabricating with low-pressure laminate composites. This is followed by a section providing an overview of the materials in modern cryogenic technology. Then, the chapter describes the effect of cryogenic temperatures on materials properties; it also introduces the various joining techniques developed for composite materials. The effects of radiation on the properties of the materials are covered as well as the processes involved in testing laminates at cryogenic temperatures. Finally, the chapter provides information available on concrete aggregate composites.

Biaxial Fatigue of Fiber-Reinforced Composites at Cryogenic Temperatures. Part I: Fatigue Fracture Life and Mechanisms

1982 ◽  
Vol 104 (2) ◽  
pp. 128-136 ◽  
Author(s):  
S. S. Wang ◽  
E. S.-M. Chim ◽  
D. F. Socie
Keyword(s):  
Fatigue Fracture ◽  
Fiber Composite ◽  
Fiber Reinforced Composites ◽  
Fracture Mechanisms ◽  
Reinforced Composites ◽  
Cryogenic Temperatures ◽  
Fiber Reinforced ◽  
Biaxial Fatigue ◽  
Electron Microscopes ◽  
Fracture Stiffness

A study of biaxial fatigue of glass fiber-reinforced composites subjected to in-phase, cyclic tensile and torsional loading at cryogenic temperatures is presented. Fatigue failure of the composite is investigated in terms of cyclic fracture, stiffness degradation, and energy dissipation. Fatigue fracture lives of the cryogenic composite are obtained for the cases of various combinations of cyclic tensile and torsional stresses. A power-law relationship is established between the range of cyclic octahedral shear stress and the number of cycles to fracture. Influences of hydrostatic mean stress and stress biaxiality ratio on fatigue fracture of the fiber composite are determined. Fracture mechanisms in the material during the cryogenic biaxial fatigue are examined by using optical and scanning electron microscopes.

Cryogenic atomic force microscopy

1991 ◽  
Vol 49 ◽  
pp. 54-55
Author(s):  
K. A. Fisher ◽  
M. G. L. Gustafsson ◽  
M. B. Shattuck ◽  
J. Clarke
Keyword(s):  
Room Temperature ◽  
Rapid Freezing ◽  
Cryogenic Temperatures ◽  
Soft Or ◽  
Electrically Conductive ◽  
Force Microscopy ◽  
Flexible Molecules ◽  
Advantages And Disadvantages ◽  
Atomic Force ◽  
Chemical Perturbation

The atomic force microscope (AFM) is capable of imaging electrically conductive and non-conductive surfaces at atomic resolution. When used to image biological samples, however, lateral resolution is often limited to nanometer levels, due primarily to AFM tip/sample interactions. Several approaches to immobilize and stabilize soft or flexible molecules for AFM have been examined, notably, tethering coating, and freezing. Although each approach has its advantages and disadvantages, rapid freezing techniques have the special advantage of avoiding chemical perturbation, and minimizing physical disruption of the sample. Scanning with an AFM at cryogenic temperatures has the potential to image frozen biomolecules at high resolution. We have constructed a force microscope capable of operating immersed in liquid n-pentane and have tested its performance at room temperature with carbon and metal-coated samples, and at 143° K with uncoated ferritin and purple membrane (PM).

Phase identification in SiC whisker reinforced Al2O3-R2O3-based composites

1992 ◽  
Vol 50 (1) ◽  
pp. 152-153
Author(s):  
C.M. Sung ◽  
K.J. Ostreicher ◽  
M.L. Huckabee ◽  
S.T. Buljan
Keyword(s):  
Analytical Electron Microscopy ◽  
Phase Identification ◽  
Reinforced Composites ◽  
Ion Milling ◽  
X Ray ◽  
Binary Oxides ◽  
Analytical Electron ◽  
The Matrix ◽  
Second Phases ◽  
Convergent Beam

A series of binary oxides and SiC whisker reinforced composites both having a matrix composed of an α-(Al, R)2O3 solid solution (R: rare earth) have been studied by analytical electron microscopy (AEM). The mechanical properties of the composites as well as crystal structure, composition, and defects of both second phases and the matrix were investigated. The formation of various second phases, e.g. garnet, β-Alumina, or perovskite structures in the binary Al2O3-R2O3 and the ternary Al2O3-R2O3-SiC(w) systems are discussed.Sections of the materials having thicknesses of 100 μm - 300 μm were first diamond core drilled. The discs were then polished and dimpled. The final step was ion milling with Ar+ until breakthrough occurred. Samples prepared in this manner were then analyzed using the Philips EM400T AEM. The low-Z energy dispersive X-ray spectroscopy (EDXS) data were obtained and correlated with convergent beam electron diffraction (CBED) patterns to identify phase compositions and structures. The following EDXS parameters were maintained in the analyzed areas: accelerating voltage of 120 keV, sample tilt of 12° and 20% dead time.

Report and discussion on “The development of fibre reinforced composites for gas turbines”

1969 ◽  
Vol 48 (10) ◽  
pp. 454
Author(s):  
H.E. Gresham ◽  
Eric Mensforth ◽  
L.R. Beesley ◽  
D. Wilkinson ◽  
R.E. Mills ◽  
...  
Keyword(s):  
Gas Turbines ◽  
Reinforced Composites ◽  
Fibre Reinforced Composites
Sign in / Sign up

Export Citation Format

Share Document