The Buckling of a Circular Plate With a Concentric Circular Hot-Spot

1960 ◽  
Vol 64 (590) ◽  
pp. 105-106 ◽  
Author(s):  
K. I. McKenzie
Keyword(s):  
Critical Temperature ◽  
Circular Plate ◽  
Radial Stress ◽  
Hot Spot ◽  
Clamped Plate ◽  
Inverse Square Law ◽  
Cold Part

If a circular plate has a concentric circular hot area, there is a critical temperature for this area at which the plate buckles. This temperature is calculated in this note for the case of a clamped plate supported in such a way that the radial stress in the cold part obeys the inverse square law.

Stress Relaxation in Press-Fitted Joints

1976 ◽  
Vol 98 (1) ◽  
pp. 137-140 ◽  
Author(s):  
R. P. Goel
Keyword(s):  
Steady State ◽  
Stress Relaxation ◽  
Circular Plate ◽  
Contact Force ◽  
Radial Stress ◽  
Printed Circuit Boards ◽  
Stress Component ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Relaxation Characteristics

When contact pins, wire wrap posts, etc., are press fitted into printed circuit boards, the contact force at the interface of a post and plate relaxes with time. Much of the relaxation of the contact force occurs immediately after the connection has been made. Theoretical estimates on the reduction in contact force until a steady state (a steady state is assumed to be reached when the stress rates become 1 percent of their initial values) is reached are presented. Since most of the relaxation of the radial stress component occurs in the vicinity of the hole, the effect of adjacent joints on the relaxation characteristics of a joint are neglected. And, therefore, only an idealized geometry of a thin circular plate with a single press-fitted hole is considered.

scholarly journals Hot Tearing of 9Cr3Co3W Heat-Resistant Steel during Solidification

Metals ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 25 ◽  
Author(s):  
Honggang Zhong ◽  
Xihao Li ◽  
Biao Wang ◽  
Tieming Wu ◽  
Yunhu Zhang ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Numerical Simulations ◽  
Hot Spot ◽  
Hot Tearing ◽  
Resistant Steel ◽  
Linear Contraction ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Contraction Stress

The linear contraction and hot tearing behavior of 9Cr3Co3W heat-resistant steel during solidification were studied by combining in-situ casting experiments and the corresponding numerical simulations. The linear contraction, stress and temperature of the samples were detected during solidification. The results show that the linear contraction of 9Cr3Co3W heat-resistant steel was 1.7% in the sand mold. Meanwhile, the critical temperature and stress of the hot tearing that occurred at the hot spot were 1304 °C and 0.72 MPa, respectively. The occurrence of hot tearing was observed at the tip of secondary dendrites along the primary dendritic arms, where the solute elements were significantly enriched at the final solidification.

The Buckling of a Reinforced Circular Plate under Uniform Radial Thrust

1961 ◽  
Vol 12 (4) ◽  
pp. 337-342 ◽  
Author(s):  
I. T. Cook ◽  
H. W. Parsons
Keyword(s):  
Exact Solution ◽  
Circular Plate ◽  
Central Region ◽  
Clamped Plate ◽  
Simply Supported ◽  
Thin Circular Plate ◽  
Radial Thrust ◽  
Thickness Function

SummaryAn exact solution for the symmetrical buckling under uniform radial thrust is obtained for a thin circular plate having a particular type of thickness function for the cases in which the edge of the plate is either clamped or simply-supported. In both cases it is found that the critical thrust necessary to produce buckling can be increased from its value for the uniform circular plate of the same material and volume by concentrating material in the central region of the plate. For the clamped plate the increase is about 18 per cent and for the simply-supported plate about 29 per cent.

Effect of a Concentric Reinforcing Ring on Stiffness and Strength of a Circular Plate

1948 ◽  
Vol 15 (1) ◽  
pp. 25-29
Author(s):  
W. A. Nash
Keyword(s):  
Tangential Stress ◽  
Circular Plate ◽  
Radial Stress ◽  
Normal Pressure ◽  
Pressure Vessels ◽  
Maximum Tangential Stress ◽  
Vertical Deflection ◽  
Concentric Ring ◽  
Thin Walled

Abstract In this study of a fixed-edge circular plate subjected to uniform normal pressure (such as is commonly used on ends of thin-walled cylindrical pressure vessels), it is shown that the maximum vertical deflection, the maximum radial stress, and the maximum tangential stress may all be reduced by reinforcing the plate with a concentric ring.

Mutation Spectrum in Patients with Wiskott-Aldrich Syndrome and X-linked Thrombocytopenia: Identification of Twelve Different Mutations in the WASP Gene

1996 ◽  
Vol 75 (04) ◽  
pp. 546-550 ◽  
Author(s):  
Marianne Schwartz ◽  
Albert Békássy ◽  
Mikael Donnér ◽  
Thomas Hertel ◽  
Stefan Hreidarson ◽  
...  
Keyword(s):  
Base Pair ◽  
Hot Spot ◽  
Missense Mutations ◽  
Nucleotide Substitutions ◽  
Exon 2 ◽  
Wiskott Aldrich Syndrome ◽  
Base Pair Deletion ◽  
Reliable Diagnosis ◽  
Wasp Gene ◽  
Detection Of Mutations

SummaryTwelve different mutations in the WASP gene were found in twelve unrelated families with Wiskott-Aldrich syndrome (WAS) or X-linked thrombocytopenia (XLT). Four frameshift, one splice, one nonsense mutation, and one 18-base-pair deletion were detected in seven patients with WAS. Only missense mutations were found in five patients diagnosed as having XLT. One of the nucleotide substitutions in exon 2 (codon 86) results in an Arg to Cys replacement. Two other nucleotide substitutions in this codon, R86L and R86H, have been reported previously, both giving rise to typical WAS symptoms, indicating a mutational hot spot in this codon. The finding of mutations in the WASP gene in both WAS and XLT gives further evidence of these syndromes being allelic. The relatively small size of the WASP gene facilitates the detection of mutations and a reliable diagnosis of both carriers and affected fetuses in families with WAS or XLT.

Challenges to immigrant associations and NGOs in contemporary Greece

2013 ◽  
Vol 10 (3) ◽  
pp. 342-358 ◽  
Author(s):  
Apostolos G. Papadopoulos ◽  
Christos Chalkias ◽  
Loukia-Maria Fratsea
Keyword(s):  
Civil Society ◽  
Economic Crisis ◽  
Hot Spot ◽  
Geographical Range ◽  
Legal Form ◽  
Social Actors ◽  
Governmental Organizations ◽  
Non Governmental Organizations ◽  
Migrant Integration ◽  
Concentration Patterns

The paper explores the challenges faced today, in a context of severe economic crisis, by immigrant associations (ΙΜΑs) and Non-Governmental Organizations (NGOs) in Greece. The data analysed here was collected between October 2009 and February 2010 and incorporates references to all recorded migration-related social actors operating in Greece. The paper takes into account such indicators as legal form, objectives, financial capacity and geographical range of activity, concluding with a typology of civil society actors dealing with migration issues. This study aims at informing the migration policymaking and migrant integration processes. By a spatial hot-spot clustering of IMAs and NGOs, we also illustrate the concentration patterns of civil society actors in Greece.

Sun Load Analysis and Testing on Automotive Front Lighting Products

2020 ◽  
pp. 116-122
Author(s):  
Emre Öztürk ◽  
Mehmet Aktaş ◽  
Tunç Şenyüz
Keyword(s):  
Prolonged Exposure ◽  
Hot Spot ◽  
Load Test ◽  
Angle Of Incidence ◽  
The Sun ◽  
Solar Simulator ◽  
Automotive Lighting ◽  
Inclination Angles ◽  
Plastic Parts ◽  
Load Simulation

The purpose of this research is to reach good correlation between sun load simulation and solar focusing test for exterior automotive lighting products. Light coming from sun is highly collimated (parallel rays) and focusable from lenses with concave structure. Focusing incidence leads to a hot spot on lens surrounding plastic parts which may cause melting failures at high temperature zones. Sun load simulation is performing to eliminate risk of discoloration, deformation, out gassing, coating failures and fire with prolonged exposure from field. Irradiance values in W/m2 defined in simulation as heat source depending of an angle of incidence of the sun radiation. At first step, simulation is performing with 5 degree intervals to define the critical zones then intervals decreased to 2 degree to detect the critical azimuth and inclination angles. Critical azimuth and inclination angles is checking with ray trace analysis to check the bouncing of sun rays and possible solution to eliminate focuses with design solutions. After numerical analysis to release and validate the automotive lighting products regarding the sun load test, measurement with first parts is necessary. Measurement is performing for all critical angles which have been detected at simulation with thermal camera under ultra high-collimation solar simulator. Measured temperatures are settled according to environment conditions and correlation is checking with simulations.

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