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A Study on the Mechanical Properties of The Honeycomb Sandwich Composites made by VARTM Soo Hyun Eum 1,a , Yun Hae Kim 1,b , Joong Won Han 1,c, Kook Jin Kim 1,d, Do Hoon Shin 2,e , Cheol Mun Yim 2,f and Ri-ichi Murakami2,g 1 Department of Materials Engineering, Korea Maritime University, Busan, Korea 2 The University of Tokushima, Tokushima, Japan a superguitar@bada.hhu.ac.kr, byunheak@hhu.ac.kr, cjgks@chollian.net, d netsfeel01@hanafos.com, egoyo@lycos.co.kr, firondoor01@hotmail.com, g murakami@me.tokushima-u.ac.jp Keywords: Autoclave process, VARTM (Vacuum Assisted Resin Transfer Molding), Laminates, Honeycomb sandwich structure, Tg (Glass transition temperature) Abstract.
Table 1 shows the details of laminate specimens and honeycomb sandwich structures respectively.
VARTM process for the laminate specimen and honeycomb sandwich structure specimen are shown in Fig. 1 and Fig. 2, respectively.
Table 3 The glass transition temperature, Tg, of each matrix Case Matrix Process Tg 1 BMS 8-79 Autoclave 165℃ 2 VRM34 VARTM 199℃ 3 CYCOM 977-20 VARTM 227℃ Table 4 The results of Case 1, 2 and 3 for laminates specimens Materials BMS 8-79 Cloth #7781+ VRM 34 Cloth #7781 + CYCOM 977-20 Properties Test temp.
References [1] George Lubin: Handbook of Composites, pp. 1-2 [2] C.

Because of the need of lubricant between the punch and the specimen the SYLAC80-05 nonchlorine lubricant oil was used [1].
The parameters used for performed SPIF process are presented in Table 1.
Table 2: Material properties of steel DC05 C = 531.5 MPa E = 210 GPa n = 0.23 ρ = 7850 kg/m3 r0 = 1.59 ν = 0.3 r45 = 1.06 t0 = 1 mm r90 = 1.76 Rp = 177 N/mm 2 where the parameters are: C…..strength coefficient [MPa] n…..strain hardening exponent [1] r…...material anisotropy [1] E…..Young's modulus of elasticity [MPa] ρ…..density [kg/m3] ν…..Poisson's ratio [1] t0…..initial specimen thickness Rp…..yield strength [N/mm2 ] In FEM simulation the elasto - plastic material behaviour was considered.
References [1] A.
Micari: Advanced Materials Research (2005), Vol. 68, p. 479-486

References [1] T.
A - Struct 413–414 (2005) 474–479
Res., 24 (1) (2011) 28–36
Res. 27 (1) (2013) 26–37
B 28 (1) (1997) 115–123

(∆gc), respectively (solid line in Fig.1).
If the growth of a faceted crystal occurs via 2-DN and growth, the growth rate is expressed as       − −=≡ rr C B dt dr R /1/1 exp * υ
As ∆gc is expressed as 1 2 )(ln − K kTh πσ [18,24] (K is a constant), ∆gc increases with increasing σ.
References [1] I.M.
Forum Vol. 475-479 (2005), Trans Tech Pub., Zürich, p. 3891 [40] D.

Figure 1.
Table 1.
Steel temperature was the highest at the corners of the square tube (S-1 and S-3) and rose almost as high as furnace temperature after approximately 70 minute heating as shown in figure 6.
Advances in Structural Engineering, 2(1), 57-71
Computers and Structures, 75(5), 479-490

In China, functionally designed CFT columns were used in SEG Plaza and Ruifeng Shangye Building as members to secure fire-resistance requirement of 3 hours[1].
Figure 1.
Table 1.
Advances in Structural Engineering, 2(1), 57-71
Computers and Structures, 75(5), 479-490

Introduction Technology research on solar cells is growing rapidly [1-2].
Table 1.
Daucus carota 479 [10] 2.59 0.61 2261.6 Based on Table 2.
The Bio-energy local area photosensitizer used is shown in Fig. (1-7).
References [1] E.

Result and Discussions Fig.1.
References [1] D.
ACS Appl Mater Interfaces 5 (2013) 479-484
A 1 (2013) 7927-7932
A 1 (2013) 3182-3186

The compositions of the alloys LDSX 1 to 8 are given in Table 1.
Figure 1: {002} reflections and the three sub-peaks (g¢, gII and gII ) of all alloys LDSX 1 to 8 at room temperature.
Fig. 4: Average lattice misfit of alloys LDSX 1 to 8.
References [1] J.X.
A 479 (2008) p. 148-156

Fig. 4 – Digital volumetric model All samples were visually graded immediately after the production according to the standards DIN 4074-1 [6] and UNI 11035 part 1 and 2 [7].
The grade criterion wane was not applied, because most material would otherwise have been classified at best in grade class S7 using DIN 4074-1.
From a total of four samples of spruce (114 UT, 98 UF) 70% of UT and 79% of UF corresponded of the grade class S13 using DIN 4074-1.
Table 1 – Gross density of spruce UT/UF and larch UF Spruce Larch UT (A) UT (I) Total UF (A) UF (D) Total UF (I) UF (D) UF (A) UF (CH) Total n. 50 63 113 47 47 94 49 55 48 45 197 um [%] 13.5 12.1 19.2 16.5 16.8 18.8 17.2 16.4 ρ05 [kg/m3] 379 350 363 396 358 377 490 459 497 470 479 ρmean [kg/m3] 440 411 423 469 434 452 568 546 592 562 566 Bending strength The determination of the bending strength along the grain was carried out according to EN 408.
If these are compared with the other two approximate models, we find there are divergences of about 1%.