The tendency of a polymeric material to deform permanently under constant pressure applied through comprehensive, tensile, flexural or shear loading is known as creep. It happens with time through continuous exposure to stress levels that are under the yield strength of the material. Given abundant time, it can cause creep rupture, the failure within a material as a result of continuously applied stress at a level below the tensile strength. When exposed to static stress, plastic materials, in particular, are prone to creep rupture. A recent study indicates that 22% of plastic failures are related with creep.
The relatively high rate of creep failure is because of the widespread lack of understanding and awareness of the effects of time on polymeric materials, especially at the design stage; the increasing use of plastic materials in diverse applications with longer time demands; and the unique difference in time dependence between polymeric materials and metals.
Understanding the concept of creep is extremely important to manufacturers and users of plastic components. In this session by plastics engineering expert, Jeffrey A. Jansen, you will learn how polymeric materials are affected by their viscoelastic properties, and also understand how low levels of applied stress can have detrimental effects on plastics. This knowledge can help you to avoid premature failure.
Who should attend?
Jeffrey A. Jansen
Jeffrey A. Jansen is Senior Managing Engineer and a Partner at The Madison Group, an independent polymeric materials engineering and consulting firm. Jeff specializes in failure analysis, material identification and selection, as well as compatibility, aging, and lifetime prediction studies for thermoplastic and ther... More info