Deformation of a Convex Hydrogel Shell by Parallel Plate and Central Compression

作者：Shi J; Robitaille M; Muftu S; Wan K T^*

来源：Experimental Mechanics, 2012, 52(5): 539-549.

DOI：10.1007/s11340-011-9514-z

• Large deformation
• Shell
• Parallel plate compression
• Central load
• Contact lens

To characterize the materials parameters and deformation of a convex shell of axial symmetry, a hydrogel contact lens is mechanically deformed by two loading configurations: (a) compression between two parallel plates and (b) central load applied by a shaft with a spherical tip. A universal testing machine with nano-Newton and submicron resolutions is used to measure the applied force, , as a function of vertical displacement of the plate/shaft, (0), while a homemade laser aided topography system records the in-situ deformed shell profile and the contact radius or central dimple, . A nonlinear shell theory and an iterative finite difference method are used to account for the large elastic deformation, the central buckling for the central load compression, and the interrelationship between the measureable quantities (, (0), ).

• 出版日期2012-6
• 单位东北大学