If a steel cylindrical specimen is stressed nominally to 70 MPa, what stress level exists at the tip of an elliptical surface flaw, whose length is 5.3 microns and radius of curvature is 1,074 nanometers

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers