Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session S01: Poster Session & Refreshment Break IV (3:34 - 4:25 p.m.)
3:34 PM,
Monday, November 20, 2023
Room: Exhibit Hall D
Abstract: S01.00165 : Immersion of polyamide 6,6 in saline solutions: understanding the impact of water and salts on the cracking mechanisms*
Presenter:
Edwige Lay
(ESPCI Paris PSL - Renault)
Authors:
Edwige Lay
(ESPCI Paris PSL - Renault)
Bruno Bresson
(ESPCI Paris PSL)
Pierre Furtwengler
(Renault)
Laurent Gervat
(Renault)
Annie COLIN
(ESPCI Paris PSL)
Costantino Creton
(ESPCI Paris - PSL)
During simple immersion tests, we have shown that without applied stress, no significant absorption of ions is detected. The mechanical effects have therefore been related to the water activity in the saline solutions.
When applying a constant stress during the contact with road salts, different cracking behaviors have been evidenced. At room temperature, no cracking is observed under yield stress. At yield stress:
- water induces plasticization wrinkles but the diffusion path has yet to be observed
- NaCl-type salts create thin crazes with no detected absorption of salts
- CaCl2-type salts create large crazes with detected absorption of salts
The distinction between the different behavior has been attributed to the localization of plasticity and the plasticity instabilities created by the saline solutions.
Further experiments will aim at describing these instabilities considering various hypotheses: surface tension effects, chemistry, osmotic pressure in the crazes,…
*We aknowledge funding from Renault
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