Abstract

Development of an engineering method for predicting the ratcheting in an engineering thermoplastic polyamide 6 has been attempted. For this purpose, the ratcheting behavior of polyamide 6 is studied with emphasis on its temperature dependence. First, mechanical ratcheting tests with different levels of maximum stresses are performed on coupon specimens at different temperatures, respectively. The experimental results show that the accumulation of ratcheting strain in the polyamide 6 is significantly dependent on temperature as well as the maximum level of stress cycles. The ratcheting behavior is similar to the transient creep behavior in all aspects of its stress and time dependence. It is demonstrated that a master curve can be identified for the ratcheting data obtained over a range of temperature by scaling the time axis with the help of a shift factor that depends on stress.

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