 | | Mechanics of Solids
A Journal of Russian Academy of Sciences | | Founded
in January 1966
Issued 6 times a year
Print ISSN 0025-6544
Online ISSN 1934-7936 |
Archive of Issues
| Total articles in the database: | | 12854 |
| In Russian (Èçâ. ÐÀÍ. ÌÒÒ): | | 8044
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| In English (Mech. Solids): | | 4810 |
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| I.V. Simonov and I.M. Smirnov, "Experimental Studies of Crack Dynamics in Polymer Films," Mech. Solids. 45 (3), 485-492 (2010) |
| Year |
2010 |
Volume |
45 |
Number |
3 |
Pages |
485-492 |
| DOI |
10.3103/S0025654410030180 |
| Title |
Experimental Studies of Crack Dynamics in Polymer Films |
| Author(s) |
I.V. Simonov (Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, pr-t Vernadskogo 101, str. 1, Moscow, 119526 Russia, simonov@ipmnet.ru)
I.M. Smirnov (Ishlinsky Institute for Problems in Mechanics, Russian Academy of Sciences, pr-t Vernadskogo 101, str. 1, Moscow, 119526 Russia) |
| Abstract |
Using high-speed video recording, we observed fast propagation of cracks across polymer film strips of different rheology and determined several quantitative characteristics of their motion. We discovered and described a series of characteristics of the crack path variation, the dynamical behavior of the adhesion zone ahead of the crack, and its branching before coming out to the free surface.
One of the most important mechanical problems is to construct models of fracture of materials and structural elements. The goal of experimental studies of crack propagation is to classify these models. Slow crack growth in thin films has been considered in many papers. For example, in the recent paper [1], subcritical crack growth in polycarbonate films under the action of tensile loads less than limit loads was studied in the case where the adhesion zone length is comparable with the crack length. However, the authors are not acquainted with any studies of fast crack propagation in films.
In the present paper, we generalize the results of processing of experimental data in fast processes of fracture of polymer film strips of two types. Examining high-speed video recording frames, we studied the laws of propagation of a crack from the initial cut in a film made of hard polyester and laws of development of the crack tip zone in a film made of soft polypropylene admitting large plastic strains. We determined the rate of defect growth in time. We observed the formation of qualitatively different plastic regions near the crack tips in films of different thickness and rheology and described scenarios of crack coming out to the free surface. We discovered the effect of branching of a narrow and long plastic tip zone as the crack approaches the free boundary leading to putting out a small triangular piece of the film. |
| Keywords |
polymer film, crack dynamics, adhesion zone, high-speed video recording |
| References |
| 1. | P. Ph. Cortet, L. Vanel, and S. Ciliberto,
"Dynamical Law for Slow Crack Growth in Polycarbonate Films,"
Phys. Rev. Lett.
99 (20), 205502-1-205502-4 (2007). |
| 2. | V. Z. Parton and E. M. Morozov,
Mechanics of Elastoplastic Fracture
(Nauka, Moscow, 1985)
[in Russian]. |
| 3. | Yu. N. Rabotnov,
Mechanics of Deformable Solids
(Nauka, Moscow, 1979)
[in Russian]. |
| 4. | B. Tsoi, E. M. Kartashov, and V. V. Shevelev,
Strength and Fracture of Polymer Films and Fibers
(Khimiya, Moscow, 1999)
[in Russian]. |
| 5. | M. Elices and J. Llorca (Editors)
Fiber Fracture
(Elsevier, N. J., 2002). |
| 6. | D. S. Dugdale,
"Yielding of Steel Sheets Containing Slits,"
J. Mech. Phys. Solids
8 (2), 100-108 (1960). |
|
| Received |
20 January 2010 |
| Link to Fulltext |
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