Figure 3: Buckling mechanics of triangular network architectures under uniaxial tensile loading.
From: Soft network composite materials with deterministic and bio-inspired designs
(a–d) Colourized scanning electron microscope (SEM) images and overlaid FEA results of two different polyimide network structures uniaxially stretched to 40%. When w>t the structures exhibit significant out-of-plane buckling. All scale bars are 2 mm. FEA results on (e) stress–strain responses and (f) corresponding tangent moduli for networks with three different thicknesses, with θ=180° and w*=0.15. (g) Critical thickness as a function of filament width for θ=180° and R=200 μm. (h) Critical thickness as a function of arc angle for w=30 μm and R=200 μm.
