High fibre content composite laminate skins use marine grade orthophthalic polyester, POLYLITE® 440-M850 resin and chopped strand mat/woven E-glass for the thin outer face skins and DIVINYCELL® H100 closed-cell linear PVC foam as core. Marine grade hybrid sandwich panels are designed in accordance with BS EN ISO 12215-5:2008 for small craft hull construction, using a wet lay-up and cured under vacuum pressure. Impact damage testing followed ASTM D7766-11 and ASTM D6264-98 procedures A and B for rigidly supported and simply supported sandwich panels. A review of the current state of standard testing procedures of marine sandwich panels is described. Testing using the default hemisphere indentor also included other standard rock geometries – conical, square-based pyramid and flat-faced cylindrical. The damage incurred under each variation of indentation impact is described, in terms of force, absorbed energy and indentation displacement. New contact laws are suggested for the different rock geometries. Destructive sectioning of the panels provides the visual damage incurred through the thin face skins and core and the roles played by all members comprising the sandwich panels.
AbrateS. Modelling of impacts on composite structures. Compos Struct2001; 51: 129–138.
4.
AbrateS. Impact on composite structures, Cambridge: Cambridge University Press, 2005.
5.
ChoiHYDownsRJChangFK. A new approach towards understanding damage mechanisms and mechanics of laminated composites due to low velocity impact: part 1 - Experiments. J Compos Mater1991; 25: 992–1011.
6.
ChoiHYWuTH-YChangFK. A new approach towards understanding damage mechanisms and mechanics of laminated composites due to low velocity impact: part 2 - Analysis. J Compos Mater1991; 25(8): 1012–1038.
7.
ChoiHYChangFK. A model for predicting damage in graphite epoxy laminated composites resulting from low velocity point impact. J Compos Mater1992; 26(14): 2134–2169.
8.
FinnSRSpringerGS. Delaminations in composite plates under transverse static or impact loads. Compos Stuct1993; 23: 177–204.
9.
LakshminarayanaHV. Impact response of laminated composite plates: Rediciton and verification. Compos Struct1994; 28: 61–72.
10.
HuangJY. Predicition of the residual strength of laminated composites subjected to impact loading. J Mater Process Technol1995; 54: 205–210.
11.
ZhengSSunCT. A double plate finite element model for the impact induced delamaination problem. Compos Sci Technol1995; 53: 111–118.
12.
ZhouG. Damage mechanisms in composite laminates impacted by a flat ended impactor. Compos Struct Technol1995; 54: 267–273.
13.
ChunLLamKY. Dynamic response o fully clamped laminate composite plates subjected to low velocity impact of a mass. Int J Solids Struct1998; 35(11): 963–977.
14.
De MouraMFGoncalvesJPMarquesAT. Modelling compression failure after low velocity impact onlaminated composites using interface elements. J Compos Mater1997; 31: 1462–1479.
15.
De MouraMFMarquesAT. Predicition of low velocity impact damage in carbon epoxy laminates. Compos Part A: Appl Sci Manuf2002; 33: 361–368.
16.
De MouraMFGoncalvesJP. Modelling the interaction between matrix cracking and delamination in carbon expoxy laminates under low velocity impact. Compos Sci Technol2001; 61: 2069–2074.
17.
HouJPPetrinicNRuizC. A delamination criterion for laminated composties underlow impact velocity. Compos Sci Technol2001; 61: 2069–2074.
18.
DaviesGAOlssonR. Impact on composite structures. Aeronaut J2004; 108: 541–563.
19.
HosurMVAdbullahMJeelaniS. Studies on the low velocity impact response of woven hybrid composites. Compos Struct2005; 67: 253–262.
20.
LiSReidSRZouZ. Modelling damage of multiple delamiantions and transverse matrix cracking in laminated composites dueo to low velocity lateral impact. Compos Sci Technol2006; 66: 827–836.
21.
BouvetCCastineBBizeulM. Low velocity impact modelling in laminate composite panels with discrete inerface elements. Int J Solids Struct2009; 46(14–15): 2809–2821.
22.
MurthyKLReddySHarinathareddyM. FRP composite laminate behaviour under low velocity impact load. Int J Mech Prod Eng2013; 2(1): 102–106.
23.
Lopresto V and Caprino G. Damage mechanisms and energy absorption in composite laminates under low velocity impact loads. In: Dynamic behaviour of composite and sandwich structures, Naples, Italy, pp. 209–289.
24.
SevkatELiawBDelaleF. Drop wight impact response of hybrid composites impacted by impactors of various geometries. Mater Des2013; 52: 67–77.
25.
MitrevskiTMarshallIHThomsonR. Low velocity impacts on preloaded GRRP specimens with various impactor shapes. Compos Struct2006; 76: 209–217.
26.
MitrevskiTMarshallIHThomsonR. The influence of impactor shape on the damage to the composite laminates. Compos Struct2006; 76: 116–122.
27.
MitrevskiTMarshallIHThomsonR. The effect of impactor shape on the impact response of composite laminates. Compos Struct2005; 67: 139–148.
28.
AbrateS. Localized impact on sandwich structures with laminated facings. Appl Mech Rev1997; 50(2): 69–82.
29.
OlssonR. Engineering method for prediction of impact response and damage in sandwich panels. J Sandwich Struct Mater2002; 4: 3–29.
30.
ChaiGBZhuS. A review of low-velocity impact on sandwich structures. Proc IMechE, Part L: J Materials: Design and Application2011; 225: 207–230.
31.
HazizanMACantwellWJ. The low impact response of foam based sandwich structures. Compos Part B: Eng2002; 33(3): 193–204.
32.
WenHMReddyYTReidSR. Indentation, penetration and perforation of composite laminates and sandwich panels under quasistatic and projectile loading. Key Eng Mater1998; 141–143: 501–552.
Williamson JE. Response mechanisms in the impact of graphite/expoxy honeycomb sandwich composite plates. Master of Science Thesis, MIT, USA, 1989.
40.
Wang J, Waas AM and Wang H. Experimental study on the lowvelocity impact behaviour of foan core sandwich materials. In: AIAA/ASME/ASCE/AHS/ASC structures, structural dynamics and materials conference, Hawaii, pp. 1–13.
41.
LiYXuefengAYuX. Comparison with low velocity impact and quasi static indentation testing of foam core sandwich composites. Int J Appl Phys Math2012; 2(1): 58–62.
42.
LiZZhengZYuX. Low velocity perfforation behaviour of composite sandwich panels with aluminium foam core. J Sandwich Struct Mater2012; 15(1): 92–109.
43.
SutherlandLSGuedes SoaresC. The use of quasi-static testing to obtain the low velocity impact damage resistance of marine GRP laminates. Compos Part B: Eng2012; 43(3): 1459–1467.
44.
SutherlandLSGuedes SoaresC. Scaling of imapct on low fibre volume glass polyester laminates. Compos Part A: Appl Sci Manuf2007; 38(2): 307–317.
SutherlandLSGuedes SoaresC. Impact behaviour of typical marine composite laminates. Compos Part B: Eng2006; 37: 89–100.
48.
SutherlandLSGuedes SoaresC. Impact characterisation of low fibre volume glass reinforced polyester circular plates. Int J Impact Eng2005; 31: 1–23.
49.
SutherlandLSGuedes SoaresC. Effect of laminate thickness and of matrix resin on the impact of low volume fibre, woven rovening E-glass composites. Compos Sci Technol2004; 64: 1694–7000.
50.
SutherlandLSGuedes SoaresC. Effects of laminate thickness and reinforcement type on the impact behaviour of E-glass/polyester laminates. Compos Sci Technol1999; 59: 2243–2260.
Choquese D, Baizeau R and Davies P. Experimental studies of impact on marine composites. In: Proceedings of ICCM12, Paris, 1999. Paper 193.
53.
BaralNCartieDDPartridgeJK. Improved impact performance of marine sandwich panels using through thickness reiinforcement: Experimental results. Compos Part B: Eng2010; 41: 117–123.
54.
Collombet F, Guillaumat L, Lataillade JL, et al. A study of impacted composite structures by means of the response surface methodology. In: Proceedings of ICCM12, Paris, 1999. Paper 227.
55.
Davis P. Scale and size effects in the mechaincal characterisation of composite and sandwich materials. In: Proceednigs of ICCM12, Paris, 1999. Paper 1033.
56.
AtasCSevimC. On the impact reponse of sandwich composites with cores of balsa wood and PVC foam. Compos Struct2010; 93: 40–48.
57.
CharcaSShafiqBJustF. Repeated slamming of sandwich panels on water. J Sandwich Struct Mater2009; 11: 409–424.
58.
CharcaSShafiqB. Damage assessment due to single slamming of foam core sandwich composites. J Sandwich Struct Mater2010; 12: 97–112.
59.
CharcaSShafiqB. Damage assessment due to repeated slamming of foam core sandwich composites. J Sandwich Struct Mater2011; 13: 97–109.
60.
De Marco Muscat-Fenech C, Cortis J, Buhagiar R, et al. Impact and grounding damage resistance analysis of marine grade sandwich hull panels. In: ICCS17, 17th international conference of composite structures, 17–21 June, Portugal, 2013.
61.
De Marco Muscat-Fenech C and Cortis J. Fabrication of advanced hybrid composite sandwich panels - testing & simulation – FACTS. Malta: University of Malta and Malta Council for Science and Technology, R&I-2011-002, 2013.
62.
Cortis J, De Marco Muscat-Fenech C and Cassar C. Hybrid composite hull panels fabricated using vacuum bagging techniques. In: NAV2012 international conference on ships and shipping research, Naples, Italy, 2012.
63.
De Marco Muscat-Fenech CM and Cortis J. Fabrication of advanced hybrid composite sandwich panels - testing & simulation - FACTS - 3. Strength testing of the fabrication proces. Malta: University of Malta and Malta Council for Science and Technology, R&I-2011-002-WP3, 2013.
64.
British Standards Institution. Small craft - Hull construction and scantlings - Part 5: Design pressures for monohulls, design stresses, scantlings determination. International Organisation for Standardisation, 2008. BS EN ISO 12215-5:2008.
65.
De Marco Muscat-Fenech CM and Cortis J. Fabrication of advanced hybrid composite sandwich panels - testing & simulation - FACTS - 6. Analytical evaluation. Malta: University of Malta and Malta Council for Science and Technology, R&I-2011-002-WP6, 2013.
66.
DNV. Rules for classification of high speed, light craft and naval surface craft - Part 3 Chapter 1, Design principles, design loads. DNV.
67.
British Standard Institution. Plastics film and sheeting. Determination of impact resistance by the free-falling dart method. Stair case methods. London: BIS, 2004. BS EN ISO 7765-1:2004.
68.
British Standards Institution Plastics. Determination of puncture impact behaviour of rigid plastics - Part 1: Non-instrumented impact testing. London: BIS, 2000. BS EN ISO 6603-1:2000.
69.
British Standards Institution. Plastics. Determination of multi-axial impact behaviour of rigid plastics - Part 2: Instrumented impact testing. London: BIS, 2001. BS EN ISO 6603-2:2000.
70.
ASTM. Standard practice for damage resistance testing of sandwich constructions. Philadelphia: American Society for Testing and Materials, 2011. ASTM D7766/D7766M-11.
71.
ASTM. Standard test method for measuring the damage resistance of a fiber-reinforced polymer-matrix composite to a concentrated quasi-static indentation force. Philadelphia: American Society for Testing and Materials, 2004. ASTM D6264-98.
72.
ASTM. Standard test method for measuring the damage resistance of a fiber reinforced polymer matrix composite to a drop weight impact event. Philadelphia: American Society for Testing and Materials, 2005. ASTM D7136/D7136M-05.
73.
De Marco Muscat-Fenech CM and Cortis J. Fabrication of advanced hybrid composite sandwich panels - testing & simulation - FACTS - 5. Testing of impact scenarios. Malta: University of Malta and Malta Council for Science and Technology, R&I-2011-002-WP5, 2013.
74.
ASTM. Standard test method for compressive residual strength properties of damaged polymer matrix composite plates. Philadelphia: American Society for Testing and Materials, 2007. ASTM D&137/D7137M-07.
75.
Muscat-Fenech C. The tearing of ships’ pating upon grounding (SHP155). Part 1 – ‘Blunt’ underwater obstacles. University of Reading, UK, 1996. EPSRC/MTD/MoD. (No. GR/J42014).
76.
Muscat-FenechCAtkinsA. Denting and fracture of sheet steel by blunt and sharp obstacles inglancing collisions. Int J Impact Eng1998; 21: 499–519.
