No abstract

The majority of the mechanical components in aeronautical applications show a reduction of their performance during their service life. Sometimes the component replacement is necessary, with the consequent cost of material and time. An alternative is to repair the component depositing a coating onto the metallic alloy. In this work, a cold spray technique was used to generate Ti6Al4V coatings onto a bulk of the same material. The mechanical response of these coatings was investigated by instrumented indentation tests. Additionally, instrumented indentation tests were also conducted on the particles used for the spraying process and on the substrate. The Young's modulus and the hardness of the coatings were compared to those obtained on the particles and on the substrate. The mechanical properties obtained on the coatings presented values similar to those obtained on the substrate. Also, the sprayed particles showed a hardness significantly lower than that obtained on the coatings.

No abstract

Tensile stress-strain curve of metallic materials can be determined by the representative stress-strain curve from the spherical indentation. Tabor empirically determined the stress constraint factor (stress CF), ψ, and strain constraint factor (strain CF), β, but the choice of value for ψ and β is still under discussion. In this study, a new insight into the relationship between constraint factors of stress and strain is analytically described based on the formation of Tabor's equation. Experiment tests were performed to evaluate these constraint factors. From the results, representative stress-strain curves using a proposed strain constraint factor can fit better with nominal stress-strain curve than those using Tabor's constraint factors.

No abstract

No abstract

No abstract

No abstract