ABSTRACT
Therollbarrelmaterialwouldnormallybehaveelasticallytoveryhighstresslevelsuntiltheyield stressisexceeded.Asthetemperatureincreases,however,theyieldstresswilldrop.Assurfacetemperaturesinexcessof600°C(11000F)areexperienced,apointisreachedwhentheyieldstressisexceeded. Whenthishappens,plasticdeformationoccursbetweenpointsBandC.
