Abstract
The application of the crack layer theory to fatigue crack propagation (FCP) in rubber compounds is discussed. A crack tip damage evolution coefficientμ is employed to assess the extent of damage as a fraction of the damage associated with critical crack propagation. The results can be expressed in the form
where da/dN is the rate of FCP,T is the tearing energy (energy release rate) whose critical value isT c, andβ is a phenomenological constant.
Experimental data for two rubber compounds, previously obtained by other workers, have been analyzed using the crack layer approach. Although damage, sometimes, cannot be easily detected in the case of rubber samples,μ increases during stable crack propagation. The value of the damage coefficientμ evolves differently for each compound approaching unity at catastrophic failure.
Résumé
On discute de l'application de la théorie de la fissure par couches à la propagation d'une fissure de fatigue dans des composants en élastomère. On utilise un coefficientμ d'évolution du dommage à l'extrémité de la fissure pour établir l'étendue du dommage en fonction du dommage correspondant à la propagation critique de la fissure.
Les résultats sont exprimés sous une formeda/an = f(T 2, T c ,β) oùT est la vitesse de relaxation de l'énergie en arrachement,T c sa valeur critique,β une constante phénomélogique etda/dn la vitesse de propagation de la fissure de fatigue.
En utilisant cette approche, on analyse les données expérimentales obtenues par d'autres chercheurs sur deux élastomères. Bien que le dommage ne peut parfois pas être détecté aisément dans des échantillons d'élastomère, on constate queμ s'accroît durant la propagation stable de la fissure. La valeur du coefficient de dommageμ évolue différemment selon lélastomère, et tend vers l'unité lorsque la rupture devient catastrophique.
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Aglan, H., Moet, A. Crack tip damage in rubber compounds. Int J Fract 40, 285–294 (1989). https://doi.org/10.1007/BF00963662
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DOI: https://doi.org/10.1007/BF00963662