Class: BE210
Group: 101_A4
Members:

Adam Chao
Jordon Giancoli
Andrea Tan

Powerpoint Presentation
Full Text

It is the goal of this experiment to develop a mechanistic understanding of the time-dependent deformation that occurs as a result of a constant stress applied to the material; manufacture of materials in conjunction with this knowledge allows for a more comprehensive and careful planning of design to account for the inherent nature of certain materials to deform over time.
    Using natural rubber as a surrogate sample and chicken skin as a biological sample to mimic the behavior seen in soft tissues, creep tests will be performed where a constant stress will be applied for a specified amount of time and the amount of deformation occurred on account of this stress will be measured. Previous studies have indicated that creep occurs at temperatures higher than 1/3 the melting temperature when the nominal stress is directly below 10% of the yield stress. Through the rubber band and chicken skin trials, we hope to validate the previous findings. The central hypothesis therefore is as such: both rubber bands and chicken skin will exhibit creep at room temperature when the stress applied is within the 10% yield stress limit. The magnitude of creep compliance is hypothesized to be larger for the chicken skin as it exhibits a larger propensity to stretch. However, as the chicken skin is variable, we expect the rubber bands to exhibit more consistent and predictable behavior.