caa a22 4500 445812478 CHVBK 20180317145216.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00419-011-0510-7 doi (NATIONALLICENCE)springer-10.1007/s00419-011-0510-7 Theoretical analysis of the deformation of SMP sandwich beam in flexure [Elektronische Daten] [Z. Wang, Z. Li] Shape memory polymers (SMPs) can have a large frozen strain but with a very small recovery stiffness in comparison with shape memory metals or ceramics. To provide more deployable stresses for the application of actuators, sandwich beams consisting of a SMP core and two thin metallic skins were considered. The packaging behaviors of two types of SMP sandwich beams, aluminum/SMP/aluminum and steel/SMP/steel, were discussed. Due to the high compliance of SMP core on packaging condition that the testing temperature is above the activation temperature of the material, buckling and post-buckling are the essential deformation mechanisms of SMP sandwich beams under bending. Theoretical solutions were derived in studying such non-linear behaviors, including the initiation of critical buckling, post-buckling response, and final failure modes. Systematic parameter's analyses, e.g., buckling half-wavelength, amplitude, location of the neutral-strain surface in different packaging curvatures, were also presented. Springer-Verlag, 2011 Shape memory polymer nationallicence Sandwich structure nationallicence Shape recovery nationallicence Buckling nationallicence z m : thickness of metallic skin nationallicence z e : thickness of SMP epoxy core nationallicence z t : thickness of tensioned SMP core nationallicence z c : thickness of compressed SMP core nationallicence z ′ t : thickness of tensioned metallic skin nationallicence z ′ c : thickness of compressed metallic skin nationallicence ε eff : effective strain nationallicence E eff : effective modulus of buckled skin nationallicence ε z : strain of SMP core nationallicence γ xoz : shear strain of SMP core nationallicence w : buckling displacement of metallic skin nationallicence w e : displacement of SMP core nationallicence E m : Young's modulus of metallic skin nationallicence E e : Young's modulus of SMP epoxy core nationallicence G m : shear modulus of metallic skin nationallicence G e : shear modulus of SMP epoxy core nationallicence l : length of SMP sandwich beam nationallicence b : width of SMP sandwich beam nationallicence a : buckling magnitude of metallic skin nationallicence λ : buckling wavelength of metallic skin nationallicence m : buckling mode number of metallic skin nationallicence EI : flexural stiffness of metallic skin nationallicence ρ : curvature radius nationallicence M : applied bending moment nationallicence z ns : distance from geometric midplane to neutral-strain surface nationallicence T : virtual work applied on the compressed region nationallicence $${U_c^m}$$ : compressed strain energy in unbuckled metallic skin nationallicence $${U_b^m}$$ : strain energy in buckled metallic skin nationallicence U e : strain energy in SMP epoxy core nationallicence $${U_{\rm xoz}^S}$$ : shear strain energy of SMP core in the x − z plane nationallicence $${U_z^T}$$ : tensioned/compressed strain energy of SMP core along length direction nationallicence Wang Z. Department of Mechanics, School of Civil Engineering, Beijing Jiao-Tong University, 100044, Beijing, China aut Li Z. Department of Mechanics, School of Civil Engineering, Beijing Jiao-Tong University, 100044, Beijing, China aut Archive of Applied Mechanics Springer-Verlag 81/11(2011-11-01), 1667-1678 0939-1533 81:11<1667 2011 81 419 https://doi.org/10.1007/s00419-011-0510-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00419-011-0510-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Z. Department of Mechanics, School of Civil Engineering, Beijing Jiao-Tong University, 100044, Beijing, China aut NATIONALLICENCE 700 1- Li Z. Department of Mechanics, School of Civil Engineering, Beijing Jiao-Tong University, 100044, Beijing, China aut NATIONALLICENCE 773 0- Archive of Applied Mechanics Springer-Verlag 81/11(2011-11-01), 1667-1678 0939-1533 81:11<1667 2011 81 419 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer