Stress analysis of a rectangular implant in laminated composites using 2-D and 3-D finite elements

An analysis method using the FEM based on the Hellinger-Reissner variation principle has been developed to determine the 3-D stresses and displacements near a rectangular implant inside a laminated composite material. Three-dimensional elements are employed in regions where the interlaminar stress is considered to be significant; 2-D elements are used in other areas. Uniaxially loaded graphite-epoxy laminates have been analyzed; the implant was modeled as four plies of 3501/6 epoxy located in the middle of the laminate. It is shown that the interlaminar stresses are an order of magnitude lower than the stress representing the applied far-field load. The stress concentration factors of both the interlaminar and in-plane stresses depend on the stacking sequence of the laminate.

[1]  P. Bar-Yoseph,et al.  New variational-asymptotic formulations for interlaminar stress analysis in laminated plates , 1986 .

[2]  E. Crawley,et al.  Use of piezoelectric actuators as elements of intelligent structures , 1987 .

[3]  Charles E.S. Ueng,et al.  A Simplified Approach for Interlaminar Stresses Around a Hole in [0/90]s Laminates , 1988 .

[4]  Satya N. Atluri,et al.  Effects of a Piezo-Actuator on a Finitely Deformed Beam Subjected to General Loading , 1989 .

[5]  Richard M. Barker,et al.  A Finite-Element Analysis Including Transverse Shear Effects for Applications to Laminated Plates , 1971 .

[6]  T. Bailey,et al.  Distributed Piezoelectric-Polymer Active Vibration Control of a Cantilever Beam , 1985 .

[7]  N. Pagano,et al.  Exact Solutions for Composite Laminates in Cylindrical Bending , 1969 .

[8]  Ming-Sang Li.  Higher order laminated composite plate analysis by hybrid finite element method , 1989 .

[9]  J. Jia,et al.  Formulation of a Laminated Shell Theory Incorporating Embedded Distributed Actuators , 1990 .

[10]  Christos Kassapoglou,et al.  Closed Form Solutions for the Interlaminar Stress Field in Angle-Ply and Cross-Ply Laminates , 1987 .

[11]  Jacob Avrashi,et al.  Interlaminar stress analysis for laminated plates containing a curvilinear hole , 1985 .

[12]  C. Kassapoglou,et al.  An Efficient Method for the Calculation of Interlaminar Stresses in Composite Materials , 1986 .

[13]  Pinhas Z. Bar-Yoseph,et al.  On the nature of the free edge stress singularity in composite laminated plates , 1988 .

[14]  Kenneth B. Lazarus,et al.  Induced strain actuation of isotropic and anisotropic plates , 1991 .

[15]  David J Warkentin,et al.  EMBEDDED ELECTRONICS FOR INTELLIGENT STRUCTURES , 1991 .

[16]  E. F. Rybicki,et al.  Approximate Three-Dimensional Solutions for Symmetric Laminates Under Inplane Loading * , 1971 .