Energy absorption behaviours of CSM-based GFRC plates with hemispherical features

In the present study, the mechanical behaviour of CSM (chopped strand mat)-based GFRC (glass fibre-reinforced composite) plates with single and multiple hemispheres under compressive loads has been investigated both experimentally and numerically. The basic stress–strain behaviours are identified with quasi-static tests on two-ply coupon laminates and short cylinders, and these are followed up with compressive tests in a UTM (universal testing machine) on single- and multiple-hemisphere plates. The ability of an explicit LS-DYNA solver in predicting the complex material behaviour of composite hemispheres, including failure, is demonstrated. The relevance and scalability of the present class of structural components as ‘force-multipliers’ and ‘energy-multipliers’ have been justified by virtue of findings that as the number of hemispheres in a panel increased from one to four, peak load and average absorbed energy rose by factors of approximately four and six, respectively. The performance of a composite hemisphere has been compared to similar-sized steel and aluminium hemispheres, and the former is found to be of distinctly higher specific energy than the steel specimen. A simulation-based study has also been carried out on a composite 2 × 2-hemisphere panel under impact loads and its behaviour approaching that of an ideal energy absorber has been predicted. In summary, the present investigation has established the efficacy of composite plates with hemispherical force multipliers as potential energy-absorbing countermeasures and the suitability of CAE (computer-aided engineering) for their design.

[1]  M. Langseth,et al.  Axial crushing of thin-walled high-strength steel sections , 2006 .

[2]  G. L. Viegelahn,et al.  Energy dissipation and associated failure modes when axially loading polygonal thin-walled cylinders , 1991 .

[3]  H Herm Hofmeyer.  Cross-section crushing behaviour of hat-sections (Part II: Analytical modelling) , 2005 .

[4]  P. H. Thornton,et al.  Crash energy management in composite automotive structures , 1988 .

[5]  Kentaro Sato,et al.  FEM Simulation to Estimate Crashworthiness of Automotive Parts , 1998 .

[6]  W. Johnson,et al.  A theoretical and experimental study of hemispherical shells subjected to axial loads between flat plates , 1975 .

[7]  D. P. Updike.  On the Large Deformation of a Rigid-Plastic Spherical Shell Compressed by a Rigid Plate , 1972 .

[8]  Norman Jones,et al.  Experimental and numerical study in axial crushing of thin walled sections made of high-strength steels , 2003 .

[9]  D. Hull,et al.  A unified approach to progressive crushing of fibre-reinforced composite tubes , 1991 .

[10]  Recep Gümrük,et al.  A numerical study of the influence of bump type triggers on the axial crushing of top hat thin-walled sections , 2008 .

[11]  N. K. Gupta,et al.  Optimization of thin conical frusta for impact energy absorption , 2008 .

[12]  Pramod K. Gupta,et al.  A study on mode of collapse of varying wall thickness metallic frusta subjected to axial compression , 2008 .

[14]  Koetsu Yamazaki,et al.  Maximization of the crushing energy absorption of tubes , 1998 .

[15]  Athanasios G. Mamalis,et al.  Crashworthy capability of composite material structures , 1997 .

[16]  Peter Myler,et al.  ‘Egg-box’ panel for commercial vehicle front – compressive loading tests , 2010 .

[17]  F. Chang,et al.  A Progressive Damage Model for Laminated Composites Containing Stress Concentrations , 1987 .

[18]  Chiara Bisagni,et al.  Progressive crushing of fiber-reinforced composite structural components of a Formula One racing car , 2005 .

[19]  Abdel Magid Hamouda,et al.  Quasi-static axial and lateral crushing of radial corrugated composite tubes , 2008 .

[20]  Dimitrios E. Manolakos,et al.  The static and dynamic axial collapse of CFRP square tubes : Finite element modelling , 2006 .

[21]  Fu-Kuo Chang,et al.  Post-Failure Analysis of Bolted Composite Joints in Tension or Shear-Out Mode Failure , 1987 .

[22]  T Wierzbicki,et al.  Crushing analysis of rotationally symmetric plastic shells , 1982 .

[23]  Athanasios G. Mamalis,et al.  The static and dynamic axial collapse of fibreglass composite automotive frame rails , 1996 .

[24]  N. Gupta,et al.  A study on buckling of thin conical frusta under axial loads , 2006 .

[25]  Tongxi Yu,et al.  Dynamic crushing of thin-walled spheres : An experimental study , 2008 .