Macromol. Chem. Phys. 9/2011

Abstract

Front Cover: The tensile force of honeycomb‐structured polymer sheets depends on the number of holes as well as the axes of the honeycomb symmetry. The introduction of defects around the stress‐concentrated position is very effective at releasing the stress. This research provides insight for the design of tunable smart materials. Further details can be found in the article by K.‐Y. Jin, D.‐Y. Kim, S.‐E. Kim, S.‐W. Kuo, J. H. Lee, M.‐Y. Lyu, S.‐H. Hwang, A. N. Gent, C. Nah,* and K.‐U. Jeong* .

Poisson's Ratios of Honeycomb‐Structured Polymer Sheets Under Large Deformation

“…The holes in the machinery direction ( y -axis in Figure 2 c,d) reveal a C 2 symmetry, implying that the stress around the central hole is affected by the neighboring holes located not only on the x -and y -axes but also on the quadrant planes. As observed in a previous report, [ 8 ] it is found that the stress concentrations around the central holes decrease with the number of holes, which is more effective when the holes are arranged along the machinery direction. Therefore, to release and delocalize the concentrated stresses, we can purposely introduce defects around the stress-concentrated position.…”

“…Understanding the mechanical behavior of patterned polymeric materials at large deformation [1][2][3][4][5][6][7][8][9][10][11] is of signifi cant importance for practical applications in smart membranes, [ 12 ] tunable photonic/phononic crystals, [ 13 ] adjustable microlenses, [ 14 , 15 ] and porous templates for cell areas (72 mm × 10 mm) at the top and bottom represent the sample holding areas during the tensile test. In order to describe the sample geometry and the honeycomb structure, two different Cartesian coordinators were employed.…”