Critical geometric boundary for the design of wrinkling-free thin film samples in the elastic regime of a uniaxial tensile test

Wrinkling has been observed frequently in the mechanical testing of thin films or membrane structures, which may cause adverse effects on the accuracy of stress and strain measurements. To overcome this problem, a dogbone geometry design is proposed and investigated to eliminate the occurrence of wrinkling when the thin film sample is stretched in a uniaxial tensile test. A numerical experiment is carried out using finite element code to...