The paper describes a Thermally-Enhanced Edge Registration (TEER) technique for precision aligning large numbers of laminae in diffusion bonding processes. This technique is particularly relevant for the formation of micro heat exchangers and microreactors requiring highly paralleled microchannel arrays but is also being used to register other laminated devices with...
The compressive behavior of continuous fiber composites is not as well
understood as their tensile behavior because research and industrial applications have until
recently focused on the latter. Furthermore, most theoretical and experimental studies on
the compression of composites have examined the case of unidirectional specimens with
fibers along the...
Micro Energy and Chemical Systems (MIECS) are multi-scale microsystems, which rely
on embedded nano and micro-scale features to process bulk amounts of fluid in
applications ranging from man-portable heat pumps, distributed fuel reforming and insitu
waste remediation. Microlamination is a well-known process architecture for
fabricating the highly parallel, high aspect...
The research is about developing a computerized design system for
microtechnology-based energy, and chemical systems (MECS). MECS devices are
a part of microfabrication, which primarily focuses on taking advantage of the
extremely high rates of heat and mass transfer available in microstructures. It
typically consists of intricate arrays of components...
The main source of the time-dependent behavior of fiber-reinforced composites is their polymeric matrix, which causes concerns about their long term durability. Although for composites where organic fibers such as Graphite are used, the fibers are also a contributing factor. A composite material may exhibit an appreciable amount of creep,...
Ever since composite laminate technology was introduced into the aerospace and automotive industry, there has been a need to fully understand the damage progression experienced by composite laminated plates in the presence of a notch. While numerous research studies have been conducted on this matter when subjected to in-plane loads,...
Polymeric composites exhibit time-dependent behavior, which raises a concern
about their long term durability and leads to a viscoelastic study of these materials.
Linear viscoelastic analysis has been found to be inadequate because many polymers
exhibit nonlinear viscoelastic behavior. Classical laminate theory is commonly used in
the study of laminated...
Design of commercial aircraft structure, composed of composite material, requires the
prediction of failure loads given large scale damage. In particular, a fuselage of
graphite/epoxy lamination was analyzed for damage tolerance given a standard large
crack that severed both skin and internal structure. Upon loading, a zone of damage is...
This report is one of a series issued in cooperation with the Air Force-Navy-Civil Subcommittee on aircraft design criteria under the supervision of the Aircraft Committee of the Munitions Board. Information reviewed and reaffirmed 1959. Original report issued June 1953.
This report is one of a series issued in cooperation with the ANC-17 Panel on Plastics for Aircraft of the Departments of the Air Force, Navy, and Commerce. Information reviewed and reaffirmed 1960. Original report issued October 1955.
This report presents the results of tests made to determine the effect of different types of configurations and notches on the tensile strength and fatigue strength of a typical epoxy laminate. Tension tests were first made of 13 groups of specimens having different forms. Based on the results of the...
This report presents the results of fatigue tests of an epoxide laminate subjected to axial loading. Direct stress tests were made at 0°, 15°, 30°, and 45° to the warp direction. Stress was applied at a frequency of 900 cycles per minute at zero mean stress on both unnotched and...
This report has been prepared as a supplement to Forest Products Laboratory Report No. 1823, "Fatigue Tests of Glass-Fabric-Base Laminates Subjected to Axial Loading." It presents a correlation of the fatigue data in the basic report with stress-rupture data on the same material reported in Forest Products Laboratory Report No....