Stress relaxation behavior of chemically treated short sisal fiber‐reinforced natural rubber composite was studied. The effect of bonding agent, strain level, fiber loading, fiber orientation, and temperature has been studied in detail. The existence of a single relaxation pattern in the unfilled stock and a two‐stage relaxation mechanism for the fiber‐filled composite is reported. The relaxation process is influenced by the bonding agent, which indicated that the process involved fiber‐rubber interface. The rate of stress relaxation increased with fiber loading, whereas it decreased with aging.
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Varghese et al. (1994) studied this question.