| Issue |
EPL
Volume 123, Number 1, July 2018
|
|
|---|---|---|
| Article Number | 16003 | |
| Number of page(s) | 7 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/123/16003 | |
| Published online | 13 August 2018 | |
Shape transformation of a wake following the process zone at the tip of a propagating crack
1 Zum Waldeskühl 12, 54298 Igel, Germany
2 Institute for Problems of Mechanical Engineering, RAS - Bol'shoi prosp. V. O. 61, 199178 St. Petersburg, Russia
(a) abo@iee.lu (corresponding author)
Received: 15 January 2018
Accepted: 2 July 2018
A process zone containing a new phase often forms at the tip of a crack in a quasi-brittle solid. We study such a zone engendered by the propagating crack. We show that depending on the crack speed, V, this zone has two distinct configurations. If the crack tip velocity is small, the zone takes a concave shape. As soon as V exceeds a critical value, 
, the zone becomes convex. A metastable remnant, the wake, forms in its rear part. It is stretched backward over a great distance and exhibits a triangle configuration with the vertex angle decreasing with speed. The morphological zone transition and the wake shape is explained by competition of the velocity of a free, plane phase front and the crack tip speed.
PACS: 62.20.mt – Cracks / 83.10.Tv – Structural and phase changes
© EPLA, 2018
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