Direct observation of the displacement field and microcracking in a glass by means of X-ray tomography during in situ Vickers indentation experiment

Abstract : The actual displacement field in a glass during an in-situ Vickers indentation experiment was determined by means of X-ray tomography, thanks to the addition of 4 vol % of X-ray absorbing particles, which acted as a speckle to further proceed through digital volume correlation. This displacement was found to agree well with the occurrence of densification beneath the contact area. The intensity of the densification contribution (Blister field proposed by Yoffe) was characterized and provides evidence for the significant contribution of densification to the mechanical fields. Densification accounts for 27% of the volume of the imprint for the studied glass, that is expected to be less sensitive to densification than amorphous silica or window glass. A major consequence is that indentation cracking methods for the evaluation of the fracture toughness, when they are based on volume conservation, as in the case of Hill-Eshelby plastic inclusion theory, are not suitable to glass. The onset for the formation of the subsurface lateral crack was also detected. The corresponding stress is z 14 GPa and is in agreement with the intrinsic glass strength.
Complete list of metadatas

Cited literature [32 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-02271548
Contributor : Eric Maire <>
Submitted on : Thursday, September 12, 2019 - 10:21:33 AM
Last modification on : Thursday, September 19, 2019 - 4:24:10 PM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : 2020-01-30

Please log in to resquest access to the document

Identifiers

Citation

Tanguy Lacondemine, Julien Réthoré, Éric Maire, Fabrice Célarié, Patrick Houizot, et al.. Direct observation of the displacement field and microcracking in a glass by means of X-ray tomography during in situ Vickers indentation experiment. Acta Materialia, Elsevier, 2019, 179, pp.424-433. ⟨10.1016/j.actamat.2019.07.053⟩. ⟨hal-02271548⟩

Share

Metrics

Record views

61