scholarly journals Mechanical fatigue fractures bivalve shells

2020 ◽  
Vol 223 (10) ◽  
pp. jeb220277
Author(s):  
R. L. Crane ◽  
M. W. Denny
Keyword(s):  
Mechanical Fatigue ◽  
Fatigue Fractures ◽  
Bivalve Shells

Bivalve shells (Corbula trigona) as a new adsorbent for the defluoridation of groundwater by adsorption-precipitation

2021 ◽  
pp. 1-11
Author(s):  
N’Zébo Sylvestre Yapo ◽  
Bi Gouessé Henri Briton ◽  
Sadat Aw ◽  
Laurence Reinert ◽  
Patrick Drogui ◽  
...  
Keyword(s):  
Bivalve Shells

scholarly journals Clumped isotope thermometry in bivalve shells: A tool for reconstructing seasonal upwelling

2021 ◽  
Vol 294 ◽  
pp. 174-191
Author(s):  
Diana E. Caldarescu ◽  
Henrik Sadatzki ◽  
Carin Andersson ◽  
Priska Schäfer ◽  
Helena Fortunato ◽  
...  
Keyword(s):  
Clumped Isotope ◽  
Bivalve Shells

scholarly journals Methods for automated crack length detection in fracture mechanical fatigue tests of unreinforced polymers

2020 ◽  
Vol 28 ◽  
pp. 1184-1192
Author(s):  
Anja Gosch ◽  
Jutta Geier ◽  
Florian Arbeiter ◽  
Michael Berer ◽  
Gerald Pinter
Keyword(s):  
Crack Length ◽  
Fatigue Tests ◽  
Mechanical Fatigue

scholarly journals Absolute seasonal temperature estimates from clumped isotopes in bivalve shells suggest warm and variable greenhouse climate

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Niels J. de Winter ◽  
Inigo A. Müller ◽  
Ilja J. Kocken ◽  
Nicolas Thibault ◽  
Clemens V. Ullmann ◽  
...  
Keyword(s):  
Seasonal Variability ◽  
Sea Water ◽  
Isotope Composition ◽  
Sea Surface ◽  
Mean Annual Temperature ◽  
Seasonal Temperature ◽  
Sea Surface Temperatures ◽  
Surface Temperatures ◽  
Temperature Reconstructions ◽  
Bivalve Shells

AbstractSeasonal variability in sea surface temperatures plays a fundamental role in climate dynamics and species distribution. Seasonal bias can also severely compromise the accuracy of mean annual temperature reconstructions. It is therefore essential to better understand seasonal variability in climates of the past. Many reconstructions of climate in deep time neglect this issue and rely on controversial assumptions, such as estimates of sea water oxygen isotope composition. Here we present absolute seasonal temperature reconstructions based on clumped isotope measurements in bivalve shells which, critically, do not rely on these assumptions. We reconstruct highly precise monthly sea surface temperatures at around 50 °N latitude from individual oyster and rudist shells of the Campanian greenhouse period about 78 million years ago, when the seasonal range at 50 °N comprised 15 to 27 °C. In agreement with fully coupled climate model simulations, we find that greenhouse climates outside the tropics were warmer and more seasonal than previously thought. We conclude that seasonal bias and assumptions about seawater composition can distort temperature reconstructions and our understanding of past greenhouse climates.

scholarly journals The effect of the outlet angle β2 on the thermomechanical behavior of a centrifugal compressor blade

2020 ◽  
Vol 29 (1) ◽  
pp. 1-8
Author(s):  
Ahmed Allali ◽  
Sadia Belbachir ◽  
Ahmed Alami ◽  
Belhadj Boucham ◽  
Abdelkader Lousdad
Keyword(s):  
Mechanical Behavior ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Complex Form ◽  
Compressor Blade ◽  
Stress Fields ◽  
The Finite Element Method ◽  
Mechanical Fatigue ◽  
Outlet Angle ◽  
The Impact

AbstractThe objective of this work lies in the three-dimensional study of the thermo mechanical behavior of a blade of a centrifugal compressor. Numerical modeling is performed on the computational code "ABAQUS" based on the finite element method. The aim is to study the impact of the change of types of blades, which are defined as a function of wheel output angle β2, on the stress fields and displacements coupled with the variation of the temperature.This coupling defines in a realistic way the thermo mechanical behavior of the blade where one can note the important concentrations of stresses and displacements in the different zones of its complex form as well as the effects at the edges. It will then be possible to prevent damage and cracks in the blades of the centrifugal compressor leading to its failure which can be caused by the thermal or mechanical fatigue of the material with which the wheel is manufactured.

Sign in / Sign up

Export Citation Format

Share Document