Influence Of Specimen Thickness Research Articles

Effects of Specimen Thickness on Stress Corrosion Cracking and Corrosion Fatigue of an Aluminum Alltoy

Sustained load stress corrosion cracking (SCC), Cyclic SCC (FSCC) and corrosion fatigue tests in 3.5% NaCl were performed on sensitized high-strength Al alloy specimens having various thicknesses. The SCC crack growth results from alternation between a crack growth of an anodic dissolution at grain boundaries and a brittle fracture of a ligament zone by hydrogen embrittlement. The influence of specimen thickness is observed not only on the threshold value for SCC crack growth KISCC but on the threshold value for FSCC crack growth KFSCC ; the greater the thickness is, the lower the KISCC and the KFSCC are. It is significant that the lowering of KFSCC against KISCC becomes remarkably greater in a thick specimens. The thickness effect on the SCC and FSCC crack growths can be explained by the difference of constraint condition at crack tips.

The Influence of Specimen Thickness in Quantitative Electron Energy Loss Spectroscopy

The application of electron energy loss spectroscopy (EELS) to light element analysis is rapidly becoming an important aspect of the microcharacterization of solids in materials science, however relatively stringent requirements exist on the specimen thickness under which one can obtain EELS data due to the adverse effects of multiple inelastic scattering.1,2 This study was initiated to determine the limitations on quantitative analysis of EELS data due to specimen thickness.

Influence of specimen thickness on charge relaxation in polymethyl methacrylate

Influence of specimen thickness on charge relaxation in polymethyl methacrylate

Flight simulation fatigue crack propagation in 7010 and 7075 aluminium plate

The fatigue crack propagation resistances of 7010-T7651, 7010-T73651 and 7075-T7351 thick plate were compared for flight simulation (gust spectrum) loading conditions. The alloy 7075-T7351 was found to be slightly superior, and this superiority was not essentially due to its higher fracture toughness. The influence of specimen thickness on the crack propagation resistance was significant. Thinner specimens gave longer crack propagation lives and, generally, lower crack propagation rates and longer delays in crack growth following severe flights.

The influence of specimen thickness on X-ray count rates in STEM-microanalysis

Abstract Measurements have been made on the variation with thickness of the ratio between the X-ray count rates for CuKα and AIKα in thin foils of an aged A1 6% Zn, 1.98% Mg, 1.34% Cu alloy using scanning transmission electron microscopy. Accurate microanalysis is prevented by what appears to be a copper-rich surface film, probably formed during electrochemical preparation of the specimen. The film is not removed by ion beam thinning but is reduced by chemical etching. The implication of the results in general for microanalysis of thin films is discussed and the importance of specimen preparation emphasized.