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We have studied the tensile deformation behaviour of thin films of agingaqueous suspension of Laponite, a model soft glassy material, when subjected toa creep flow field generated by a constant engineering normal stress. Aqueoussuspension of Laponite demonstrates aging behaviour wherein it undergoes timedependent enhancement of its elastic modulus as well as its characteristicrelaxation time. However, under application of the normal stress, the rate ofaging decreases and in the limit of high stress, the aging stops with thesuspension now undergoing a plastic deformation. Overall, it is observed thatthe aging that occurs over short creep times at small normal stresses is sameas the aging that occurs over long creep times at large normal stresses. Thisobservation allows us to suggest an aging time - process time - normal stresssuperposition principle, which can predict rheological behaviour at longertimes by carrying out short time tests.

Time-aging time-stress superposition in soft glass under tensile deformation field