Impact of thermal dependence of elastic constants on surface stress measurements

In: Review of Scientific Instruments, Jg. 75 (2004) ; Nr. 5, S. 1357 (2p)
ISSN: 1089-7623, 0034-6748
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
The accuracy of surface stress data obtained by means of bending sample methods depends on the precise knowledge of the biaxial Youngs modulus E/1−ν which enters as a prefactor in the stress calculation formula of Stoney and describes the stiffness of the sample’s material against biaxial deformation. Room temperature values are commonly used for E/1−ν. However, E/1−ν is significantly temperature dependent. A second order polynomial fit of this dependence is presented for the benefit of future measurements as well as a correction curve for old data