Suggestions

In this study was found so many deficiencies and weaknesses, consisting of number of sample of fatigue data, it should be more than or equal to 3 sample for each conditions and the longest time of immersion also researched for various humidity. Because of these deficiencies and weaknesses, it could be given some suggestions for other researchers:

1. To obtained valid data for fatigue test, number of sample for fatigue data should be more than or equal to 3 samples.

2. Immersion time in this study is the minimum time. Hopefully, in the next experiment the other researchers could take more time to soak the specimen in water, i.e. 10 weeks, 20 weeks, and 30 weeks and so on.

3. Other researchers also could conduct a research to find the differences of the static and fatigue strengths between specimen that immersed in distilled water and immersed in seawater.

4. Other researcher can conduct a research in various humidity, such as:

50%RH, 75%RH, 80%RH or 90%RH or combination of them.

5. Also, the researcher could conduct a research in various temperature of the water. Such as in high temperature or in low temperature or combination of them.

REFERENCE

1. Tom Bitzer, “Honeycomb Technology; Material, Design, Manufacturing, Applications and Testing”, Chapman & Hall, London, UK, 1997.

2. L. J. Gibson, and M. F. Ashby, “Cellular Solids” Cambridge, 1988.

3. G. Shi, and P. Tong, “Equivalent Transverse Shear Stiffness of Honeycomb Cores”, Internal Journal of Solids and Structures, Vol. 32, Issue 10, pp.1383-1393, May 1995.

4. J. M. Albuquerque, M. F. Vaz, and M. A. Fortes, “Effect of Missing Walls on the Compression Behavior of of honeycombs,” Scripta Materialia, Vol. 41, Issue 2, pp. 167 - 174, June 1999.

5. W. Becker, “Closed-Form Analysis of the Thickness Effect of Regular Honeycomb Core Material,” Composite Structures, Vol. 48, Issue 1-3 , pp.

67-70,Jannuary-March 2000.

6. M. Doyoyo, and D. Mohr, “Microstructural Response of Aluminum Honeycomb to Combined Out-of-Plane Loading”, Mechanics of Materials, Vol. 35, Issue 9, pp. 865-876, September 2003.

7. M. Y. Yang, and J. S. Huang, “Elastic Buckling of Regular Hexagonal Honeycombs with Plateau Borders Under Biaxial Compression”, Composite Structures, Vol. 71, Issue 2, pp. 229-237, November 2005.

8. S. D. Pan, L. Z. Wu, Y. G. Sun, Z. G. Zhou, and J. L. Qu, “Longitudinal Shear Stregth and Failure Process of Honeycomb Cores”, Composites Structures, Vol. 72, Issue 1, pp. 42-46, January 2006.

9. F. J. Plantema, “Sandwich Construction”, Wiley, 1966.

10. H. G. Allen, “Analysis and Design of Structural Sandwich Panels”, Oxford, 1969.

11. T. Saito, and R. D. Parbery, “Parameter Identification for Aluminum Honeycomb Sandwich Panels Based on Orthotropic Timoshenko Beam Theory”, Journal of Sound and Vibration, Vol. 208, Issue 2, pp. 271-287, November 1997.

12. H. Zhao, and G. Gary, “Crashing Behavior of Aluminum Honeycombs Under Impact Loading”, International Journal of Impact Engineering, Vol. 21, Issue 10, pp.827-836, November 1998.

13. F. Meraghni, F. Desrumaux, and M. L. Benzeggagh, “Mechanical Behavior of Cellular Core for Structural Sandwich Panels”, Composite Part A: Applied Science and Manufacturing, Vol. 30, Issue 6, pp. 767-779, June 1999.

14. A. Petras, and M. P. F. Sutliffe, “Failure Mode Maps for Honeycomb Sandwich Panels”, Composites Structures, Vol. 44, Issue 4, pp. 237-252, April 1999.

15. J. K. Paik, A. K. Thayamball, and G. S. Kim, “The Strength Characteristics of Aluminum Honeycomb Sandwich Panels”, Thin-Walled Structures, Vol.

35, Issue 3, pp. 205-231, November 1999.

16. S. M. Lee and T. K. Tsotsis, “Indentation Failure Behavior of Honeycomb Sandwich Panels”, Composites Science and Technology, Vol. 60, Issue 8, pp.

1147-1159, June 2000.

17. A. Ural, A. T. Zehnder, and A. R. Ingraffea, “Fractutre Mechanics Approach to Face Sheet Delamination in Honeycomb: Measurement of Energy Release Rate of The Adhesive Bond”, Engineering Fracture Mechanics, Vol. 70, Issue 1, pp. 93-103, January 2003.

18. M. Q. Nguyen, S. S. Jacombs, R. S. Thomson, D. Hachenberg, and M. L.

Scott, “Simulation of Impact on sandwich Structures”, Composite Structures, Vol. 67, Issue 2, pp. 217-227, February 2005.

19. J. S. Huang, and J. Y. Lin, “Fatigue of Cellular Materials”, Acta Materialia, Vol. 44, Issue 1, pp. 289-296, January 1996.

20. M. Burman, and D. Zenkert, “Fatigue of Foam Core Sandwich Beam-1:

Undamaged Specimens”, International Journal of Fatigue, Vol. 19, Issue 7, pp. 551-561, October 1997.

21. M. Burman, and D. Zenkert, “Fatigue of Foam Core Sandwich Beam-2:

Effect of Initial Damaged ”, International Journal of Fatigue, Vol. 19, Issue 7, pp. 563-578, October 1997.

22. G. Schaffner, X. E. Guo, M. J. Silva, and L. J. Gibson, “Modelling Fatigue Damage Accumulation in Two-Dimensional Voronoi Honeycombs”.

International Journal of Mechanical Sciences, Vol. 42, Issue 4, pp. 645-656, April 2000.

23. A. M. Harte, N. A. Fleck, and M. F. Ashby”, The Fatigue Strength of Sandwich Beams with an Aluminum Alloy Foam Core”, International Journal of Fatigue, Vol. 23, Issue 6, pp. 499-507, July 2001.

24. J. S. Huang and S. Y. Liu, “Fatigue of Honeycomb Under In-Plane Multiaxial Loads”, Material Science and Engineering A, Vol. 308, Issue 1-2, pp. 45-52, June 2001.

25. N. Kulkarni, H. Mahfuz, S. Jeelani, and L. A. Carlsson, “Fatigue Crack Growth and Life Prediction of Foam core Sandwich Composites Under Flexural Loading”, Composite Structures, Vol. 59, Issue 4, pp. 499-505, March 2003.

26. ASTM, “Flexure Test of Flat Sandwich Constructions”, C393-62, Annual Book of ASTM Standards, 1980.

27. J. Zhang, and M. F. Ashby, “The Out-of-Plane properties of Honeycombs”, International Journal of Mechanical and Science, Vol. 34, pp. 475-489, 1992.

28. David R. Veazie, Kito R. Robinson, Kinugal Shivakumar, “Effect of The Marine Environment On The Interface Fracture Toughness of PVC Core Sandwich Composites”, Composites part B: Engineering, Vol. 35, pp. 461-466, 2004.

29. Thomas S. Gates, Xiaofeng Su, Frank Abdi, Gregory M. Odegard, Helen M.

Herring, “Facesheet Delamination of Compisite Sandwich Materials at Cryongenic Temperatures”, Composites Science and Technology, Vol 66, pp.

2423-2435, 2006.

30. Samirkumar M. Soni, Ronald F. Gibson, Emmanuel O, Ayorinde, “The Influence of Subzero Temperatures on The Fatigue Behavior of Composite Sandwich Structures”, Composites Science and Technology, Vol. 69, pp.

829-838 2009.

31. S. Allaoui, Z. Aboura, M.L. Benzeggagh, “Effects of Environmental Conditions on The Mechanical Behaviour of Corrugated Cardboard”, Composites Science and Technology, Vol. 69, pp. 104-110, 2009.

32. Awakut siriruk, Dayakar Penumadu, Y. Jack Weitsman, “Effect of Sea Environment on Interfacial Delamination Behavior of Polymeric Sandwich Structures”, Composites Science and Technology, Vol. 69, pp. 821-828, 2009.

33. Yung-li Lee, Jwo Pan, Richard Hathaway, Mark Barkey, “Fatigue Testing And Analysis – Theory and Practice”, Elsevier Butterworth-Heinemann, USA, UK, 2005.

34. Instron Series 8870 Servohydraulic Testing System Reference Manual-Equipment6060.