Complete transverse stress recovery model for linear shell elements in arbitrarily curved laminates

2020 ◽  
Vol 252 ◽  
pp. 112675
Author(s):  
Pierre M. Daniel ◽  
Johannes Främby ◽  
Martin Fagerström ◽  
Pere Maimí
Keyword(s):  
Stress Recovery ◽  
Transverse Stress ◽  
Recovery Model ◽  
Shell Elements

Study on Stresses Distribution Pattern of Wide Box Steel Girder of Arch Bridge

2013 ◽  
Vol 275-277 ◽  
pp. 1158-1162
Author(s):  
Qing Tian Su ◽  
Fei Ren ◽  
Yuan Wei Liu
Keyword(s):  
Distribution Pattern ◽  
Transverse Direction ◽  
Bottom Plate ◽  
Transverse Stress ◽  
Combined Stress ◽  
Steel Girder ◽  
Box Girder ◽  
Arch Bridge ◽  
Shell Elements ◽  
Uniformity Coefficient

Shell elements were used to simulate the wide box girder of arch bridge. Different load cases on the arch bridge were calculated and the stress distribution pattern of the wide girder was obtained. The results show that the stresses of the top plate and the bottom plate are non-uniformity along transverse direction at same section, the maximum non-uniformity coefficient of the top plate and the bottom plate are 1.89 and 1.73 respectively. To arch bridge with large ratio of width to length, the transverse stress of girder should not be neglected and the combined stress should be used to determine the structure safety.

TEM investigations of surface residual stress relaxation in A12O3 and Al2O3-SiC nanocomposite

1994 ◽  
Vol 52 ◽  
pp. 628-629
Author(s):  
J. Fang ◽  
H. M. Chan ◽  
M. P. Harmer
Keyword(s):  
Residual Stress ◽  
Single Phase ◽  
Stress Relief ◽  
Stress Recovery ◽  
Surface Residual Stress ◽  
Microscopic Mechanism ◽  
Sic Particles ◽  
Annealing Procedure ◽  
The Difference ◽  
Nano Size

It was Niihara et al. who first discovered that the fracture strength of Al2O3 can be increased by incorporating as little as 5 vol.% of nano-size SiC particles (>1000 MPa), and that the strength would be improved further by a simple annealing procedure (>1500 MPa). This discovery has stimulated intense interest on Al2O3/SiC nanocomposites. Recent indentation studies by Fang et al. have shown that residual stress relief was more difficult in the nanocomposite than in pure Al2O3. In the present work, TEM was employed to investigate the microscopic mechanism(s) for the difference in the residual stress recovery in these two materials.Bulk samples of hot-pressed single phase Al2O3, and Al2O3 containing 5 vol.% 0.15 μm SiC particles were simultaneously polished with 15 μm diamond compound. Each sample was cut into two pieces, one of which was subsequently annealed at 1300° for 2 hours in flowing argon. Disks of 3 mm in diameter were cut from bulk samples.

DMT Therapist Transitions from Medical Model Systems to the Recovery Model

2010 ◽  
Author(s):  
Ellen Schelly Hill ◽  
Jaqui Blatt ◽  
Jill Comins ◽  
Cynthia Jones ◽  
Anne Margrethe Melsom
Keyword(s):  
Medical Model ◽  
Model Systems ◽  
Recovery Model

Dynamic Analysis with Stress Recovery for Functionally Graded Materials: Numerical Simulation and Experimental Benchmarking

2014 ◽  
Vol 2 (1) ◽  
pp. 21
Author(s):  
Carlos Alberto Dutra Fraga Filho ◽  
Fernando César Meira Menandro ◽  
Rivânia Hermógenes Paulino de Romero ◽  
Juan Sérgio Romero Saenz
Keyword(s):  
Numerical Simulation ◽  
Dynamic Analysis ◽  
Functionally Graded Materials ◽  
Functionally Graded ◽  
Stress Recovery ◽  
Graded Materials

Human Stress Recovery during Exposure to Geranium Visual Stimuli

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 505b-505 ◽  
Author(s):  
Eunhee Kim ◽  
Richard H. Mattson
Keyword(s):  
Recovery Period ◽  
Visual Stimuli ◽  
Stress Recovery ◽  
Emotional States ◽  
Finger Skin Temperature ◽  
Physiological Indicators ◽  
Treatment Groups ◽  
Human Situation ◽  
Human Stress ◽  
Finger Skin

Evaluating human psychophysiological responses to plant visual stimuli provides a clearer understanding of factors within plant environments that enhance or maximize recovery from stress. Advances in physiological monitoring technology allow continuous recording and more-refined data collection of human responses to environmental stimuli. The objective of this study was to compare effects on stress recovery by exposures to geranium visual stimuli following an induced stressor, by measuring changes in physiological indicators and emotional states. One-hundred-fifty college students were randomly assigned to one of three treatment groups: red-flowering geraniums, non-flowering geraniums, or no geraniums. Each student viewed a 10-min film of a stressful human situation following a 5-min baseline, then was exposed to an assigned treatment setting during a 5-min recovery period. Continuous physiological measurements were taken of brainwave activities (EEG), skin conductance (EDR), and finger skin temperature. Self-rating scores of subjects' feelings were taken using the Zuckerman Inventory of Personal Reactions. Comparisons among treatment groups will be discussed based on gender and other demographic factors.

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