Results 251 to 260 of about 534,622 (309)

Cyclic Temperature stress testing of pharmaceuticals

Drug Development and Industrial Pharmacy, 1992
AbstractIn a previous communication the present authors have commented on some aspects of stability testing (1). The objective of the present brief paper is to comment on the design and application of cyclic temperature stress testing for pharmaceuticals. We believe it to be timely to offer such comments now because of the present increased interest in
Jens T. Carstensen, C. T. Rhodes
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Effective stresses in cyclic deformation

Scripta Metallurgica, 1979
Abstract Stress relaxation measurements showed that the relative magnitude of the effective stresses increases with cycling. For the explanation of these results, the mechanism associated with edge dislocation exhaustion and increasing screw dislocation activity is suggested. Stress relaxation measurements around various points of the hysteresis loop
A. Abel, Y.S. Chung
openaire   +1 more source

Cyclic stress–strain response of compacted gravel

Géotechnique, 2011
The positive effect of artificial densification on the stress–strain performance of granular materials is acknowledged from very ancient times but its importance greatly increased after the development of powerful machineries for the construction of large earth and rockfill dams.
MODONI, Giuseppe, J. KOSEKI, L. Q. ANH DAN   +2 more
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Cyclic stress tests for full scan circuits

Proceedings 13th IEEE VLSI Test Symposium, 1995
To ensure the production of reliable circuits and fully testable unpackaged dies for MCMs burn-in, both dynamic and monitored, remains a feasible option. During this burn-in process the circuit needs to be stressed for an extended period of time. This requires computation of cyclic input sequences to stress the circuit.
Vinay Dabholkar, Sreejit Chakravarty, J. Najm, Janak H. Patel   +3 more
openaire   +1 more source

Convergent internal stresses and steady cyclic states of stress

Journal of Strain Analysis, 1966
It is proved that if two structures differing only in their initial internal stresses are subject to the same loading history, the distributions of internal stress will approach one another in regions of creep and plasticity as the loading proceeds. This theorem is used to prove the existence and uniqueness of steady cyclic states of stress.
C. O. Frederick, P. J. Armstrong
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Psychological stress increases pituitary cyclic AMP

Pharmacology Biochemistry and Behavior, 1988
Exposure to physical stressors has been shown to produce increases in pituitary cyclic AMP in laboratory rats. In this experiment, the generality of these findings has been extended to include a psychological stressor, defined as returning the animals to a situation in which they had been exposed to footshock for four days.
B N, Bunnell, J L, Meyerhoff, G J, Kant
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Cyclic Stress in Polycrystalline Copper

1987
The dynamics of the cyclic plastic straining in polycrystalline copper was studied using a computer controlled servohydraulic test system. The experiments including strain rate changes, stress relaxation, stress dip and the analysis of hysteresis loop were done at different strain rates.
Jaroslav Polák, Jan Helešic
openaire   +1 more source

Cyclic stress analysis of flexor tendon repair

The Journal of Hand Surgery, 1991
A method of evaluating flexor tendon repair techniques with the use of cyclic testing is presented. This type of evaluation complements the presently used load-to-failure tests by providing more detailed information about gap formation at the repair site.
D L, Pruitt, P R, Manske, B, Fink
openaire   +2 more sources

CYCLIC LOADING OF THERMAL STRESSES

Journal of Thermal Stresses, 2001
The isotropic and kinematic hardening theories of plasticity are used to evaluate the cyclic loading behavior of structures under thermal stresses. The material of the structures used in this article is assumed to follow nonlinear strain hardening property. The material's strain hardening curve in tension and compression is assumed to be both identical
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Cyclic Stress – Fatigue

2012
Components in engineering applications operating under cyclic loads, commonly known as fatigue, may become unstable and cause catastrophic failure to occur unexpectedly because of structural instability. It is generally thought that over 80 % of all service failures are associated with fatigue. Therefore, operation of machines or their components under
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