Dynamic Mechanical Testing -An oscillatory (sinusoidal) Deformation deformation (stress or strain) is applied to a sample. -The material response Response (strain or stress)is measured. -The phase angleδ，or phase shift,between the deformation -Phase angleδ and response is measured.Dynamic Mechanical Testing Deformation Response Phase angle  –An oscillatory (sinusoidal) deformation (stress or strain) is applied to a sample. –The material response (strain or stress) is measured. –The phase angle , or phase shift, between the deformation and response is measured