Experimental and numerical study on the low-velocity impact behavior of foam-core sandwich panels

Abstract This paper presents the results of an experimental and numerical study on the low-velocity impact behavior of foam-core sandwich panels. Panels with polyurethane foam core and plain weave carbon fabric laminated face-sheets were subjected to low-velocity impact with hemispherical steel impactors of different diameters at various energy levels. Digital image correlation technique (a non-contact measuring system) was used to measure the real-time displacement and velocity of the impactor, and the back surface out-of-plane panel deflection time-history. A load sensor was used to record the contact force time-history. Non-destructive inspection and destructive sectioning methods were used to evaluate the internal and external damage on the sandwich panels after impact. The effects of impact variables such as impactor diameter, impact energy, and sandwich panel configuration parameters, such as face-sheet thickness and foam core thickness on the impact behavior and resulting impact damage states were studied. Based on the generalized Schapery theory, a progressive damage model is developed to describe the nonlinear behavior of plain weave carbon laminates during impact. The foam core was modeled as a crushable foam material. Coupon tests were conducted to determine the input parameters for the progressive damage model and the foam crushing properties. Three-dimensional finite element models were implemented to analyze the impact response incorporating the progressive damage model. Results from the numerical models were found to agree well with experimental observations.

[1]  Erdogan Madenci,et al.  Experimental investigation of low-velocity impact characteristics of sandwich composites , 2000 .

[2]  Q. Qin,et al.  Low-velocity heavy-mass impact response of slender metal foam core sandwich beam , 2011 .

[3]  Dirk Vandepitte,et al.  Failure analysis of low velocity impact on thin composite laminates : Experimental and numerical approaches , 2008 .

[4]  T. J. Wang,et al.  Damage evolution of sandwich composite structure using a progressive failure analysis methodology , 2011 .

[5]  Yulfian Aminanda,et al.  Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins , 2008 .

[6]  Paul Compston,et al.  Low Energy Impact Damage Modes in Aluminum Foam and Polymer Foam Sandwich Structures , 2006 .

[7]  S. Jeelani,et al.  Manufacturing and low-velocity impact characterization of foam filled 3-D integrated core sandwich composites with hybrid face sheets , 2004 .

[8]  C. Hochard,et al.  Modelling of the mechanical behaviour of woven-fabric CFRP laminates up to failure , 2001 .

[9]  Anthony M. Waas,et al.  A macroscopic model for kink banding instabilities in fiber composites , 2006 .

[10]  S. Sanchez-Saez,et al.  Numerical modelling of foam-cored sandwich plates under high-velocity impact , 2011 .

[11]  A. Khatibi,et al.  3D finite element simulation of sandwich panels with a functionally graded core subjected to low velocity impact , 2009 .

[12]  Michelle S. Hoo Fatt,et al.  Dynamic models for low-velocity impact damage of composite sandwich panels – Part A: Deformation , 2001 .

[13]  Harald E.N. Bersee,et al.  Experimental study of the low-velocity impact behaviour of primary sandwich structures in aircraft , 2009 .

[14]  Isaac M Daniel,et al.  Low velocity impact behavior of composite sandwich panels , 2005 .

[15]  K. E. Simmonds,et al.  Low-Velocity Impact Response of Foam-Core Sandwich Composites , 1992 .

[16]  Serge Abrate,et al.  Modeling of impacts on composite structures , 2001 .

[17]  C. Santiuste,et al.  Modelling of composite sandwich structures with honeycomb core subjected to high-velocity impact , 2010 .

[18]  Richard Schapery,et al.  A theory of mechanical behavior of elastic media with growing damage and other changes in structure , 1990 .

[19]  G.A.O. Davies,et al.  Finite element modelling of low velocity impact of composite sandwich panels , 2001 .

[20]  D. Zenkert,et al.  Handbook of Sandwich Construction , 1997 .

[21]  Bertrand Lascoup,et al.  Impact response of three-dimensional stitched sandwich composite , 2010 .

[22]  Simon Charles Lie,et al.  Damage resistance and damage tolerance of thin composite facesheet honeycomb panels , 1989 .

[23]  Anthony M. Waas,et al.  Prediction of progressive failure in multidirectional composite laminated panels , 2007 .

[24]  B. Castanié,et al.  Experimental Analysis and Modeling of the Crushing of Honeycomb Cores , 2005 .

[25]  Pierre Ladevèze,et al.  Damage modelling of the elementary ply for laminated composites , 1992 .

[26]  S. Jeelani,et al.  Low-velocity impact response of sandwich composites with nanophased foam core and biaxial (±45°) braided face sheets , 2009 .

[27]  Richard Schapery,et al.  Prediction of compressive strength and kink bands in composites using a work potential , 1995 .

[28]  Serge Abrate,et al.  Impact on Composite Structures , 1998 .

[29]  Gin Boay Chai,et al.  A model to predict low-velocity impact response and damage in sandwich composites , 2008 .

[30]  John S. Tomblin,et al.  Impact Damage Resistance and Tolerance of Honeycomb Core Sandwich Panels , 2008 .

[31]  Michelle S. Hoo Fatt,et al.  Dynamic models for low-velocity impact damage of composite sandwich panels – Part B: Damage initiation , 2001 .

[32]  Craig S. Collier,et al.  Progressive damage and failure modeling in notched laminated fiber reinforced composites , 2009 .

[33]  C. Santiuste,et al.  FEM analysis of dynamic flexural behaviour of composite sandwich beams with foam core , 2010 .

[34]  Paul A. Lagace,et al.  Impact Resistance of Composite Sandwich Plates , 1989 .

[35]  Alastair Johnson,et al.  Prediction of impact damage on sandwich composite panels , 2005 .

[36]  M. Ashby,et al.  Cellular solids: Structure & properties , 1988 .