SAMPE Journal - January/February 2011 - 37
Table 4. Bond strengths and fracture failure modes of FM 309-1M and FM-300K adhesives*.
the sandwich panels described above. The T40-800B/5320 cure cycle provided by the supplier (Cytec) was used. Results were tabulated and are shown in Table 4. FM 309-1M adhesive was recommended by Cytec as the adhesive for HC/SS panel fabrication in OOA-VBO processing. This adhesive yielded the highest strength of 10,467 ± 407 kPa (1,518 ± 59 psi) among all adhesives evaluated in this work. The FM 300K adhesive was designed by Cytec as an autoclave adhesive. Surprisingly, a high strength value of 8,618 ± 407 kPa (1,250 ± 19 psi) was obtained for this adhesive from OOA processing. Optical photographs of the fracture surfaces are shown in Figure 5. For the FM 309-1M adhesive, fillets were evenly adhered to the core walls and the hexagonal shapes of the fractured adhesive resin on the composite face sheet side were mostly intact with a few air bubbles entrapped inside. Pieces of adhesive that had broken away from the fillets on the cores were also evident on the composite face sheet side in the photograph. For the FM-300K material, adhesive fillets were voidy and
poorly distributed on the core sides. Voids in the fillets were due to foaming in the adhesive. The hexagonal shapes of the fractured adhesive resin on the composite face sheet side were mostly misshapen, with few air bubbles entrapped inside. Naked knit carrier fabric was left and visible on the composite face sheet side fracture surface. Some adhesive failure between the adhesive and the composite substrate was evident as well. Despite foaming, high FWT strength values were measured for this adhesive (Table 4). 3-D SEM photomicrographs of the fracture surfaces are compared in Figure 6. In each photograph the core side (top) and the composite face sheet side (bottom) were matched as mirror images. For the FM 309-1M adhesive, well adhered and void-free fillets on the core side were evident, while well defined, nearly void-free fractured adhesive residues on the composite face sheet side were seen. For the FM 300K adhesive, voids were present on both core and composite face sheet sides. Naked knit fabric carrier with adhesive pulled out from the composite substrate was also evident on the surface.
Figure 5. Optical photographs of the fracture surfaces of FM 309-1M and FM-300K adhesives.
SAMPE Journal, Volume 47, No. 1, January/February 2011 37
SAMPE Journal - January/February 2011
Table of Contents for the Digital Edition of SAMPE Journal - January/February 2011
SAMPE Journal - January/February 2011
Contents
President’s Message
Technical Director’s Corner
Non-Autoclave (Prepreg) Manufacturing Technology for Primary Aerospace Structures
Corporate Partners
SAMPE Journal Editorial Calender
Welcome SAMPE’s Newest Members
The SAMPE Foundation
SAMPE 2011 Long Beach
Materials & Products
Europe News & Views
SAMPE Europe’s SEICO 2011, Paris
SAMPE Europe’s SETEC 2011, Leiden
Industry News
Evaluation of Sandwich Structure Bonding in Out-Of-Autoclave (OOA) Processing
SAMPE Tech 2010–A Review
SAMPE Books & CD’s Order Form
SAMPE Proceedings
SAMPE Fall Tech Conference-Call for Papers 2011
SAMPE LinkedIn Communities
Advertiser’s Index
Resource Center
SAMPE Upcoming Conferences
Chapter Meetings Dates and Contacts
Industry Events Calendar
SAMPE Journal - January/February 2011 - SAMPE Journal - January/February 2011
SAMPE Journal - January/February 2011 - Cover2
SAMPE Journal - January/February 2011 - Contents
SAMPE Journal - January/February 2011 - 2
SAMPE Journal - January/February 2011 - President’s Message
SAMPE Journal - January/February 2011 - Technical Director’s Corner
SAMPE Journal - January/February 2011 - 5
SAMPE Journal - January/February 2011 - Non-Autoclave (Prepreg) Manufacturing Technology for Primary Aerospace Structures
SAMPE Journal - January/February 2011 - 7
SAMPE Journal - January/February 2011 - 8
SAMPE Journal - January/February 2011 - 9
SAMPE Journal - January/February 2011 - 10
SAMPE Journal - January/February 2011 - 11
SAMPE Journal - January/February 2011 - 12
SAMPE Journal - January/February 2011 - 13
SAMPE Journal - January/February 2011 - SAMPE Journal Editorial Calender
SAMPE Journal - January/February 2011 - 15
SAMPE Journal - January/February 2011 - Welcome SAMPE’s Newest Members
SAMPE Journal - January/February 2011 - 17
SAMPE Journal - January/February 2011 - 18
SAMPE Journal - January/February 2011 - 19
SAMPE Journal - January/February 2011 - The SAMPE Foundation
SAMPE Journal - January/February 2011 - SAMPE 2011 Long Beach
SAMPE Journal - January/February 2011 - Materials & Products
SAMPE Journal - January/February 2011 - 23
SAMPE Journal - January/February 2011 - Europe News & Views
SAMPE Journal - January/February 2011 - 25
SAMPE Journal - January/February 2011 - SAMPE Europe’s SEICO 2011, Paris
SAMPE Journal - January/February 2011 - 27
SAMPE Journal - January/February 2011 - SAMPE Europe’s SETEC 2011, Leiden
SAMPE Journal - January/February 2011 - 29
SAMPE Journal - January/February 2011 - Industry News
SAMPE Journal - January/February 2011 - 31
SAMPE Journal - January/February 2011 - Evaluation of Sandwich Structure Bonding in Out-Of-Autoclave (OOA) Processing
SAMPE Journal - January/February 2011 - 33
SAMPE Journal - January/February 2011 - 34
SAMPE Journal - January/February 2011 - 35
SAMPE Journal - January/February 2011 - 36
SAMPE Journal - January/February 2011 - 37
SAMPE Journal - January/February 2011 - 38
SAMPE Journal - January/February 2011 - 39
SAMPE Journal - January/February 2011 - SAMPE Tech 2010–A Review
SAMPE Journal - January/February 2011 - SAMPE Books & CD’s Order Form
SAMPE Journal - January/February 2011 - SAMPE Proceedings
SAMPE Journal - January/February 2011 - 43
SAMPE Journal - January/February 2011 - SAMPE Fall Tech Conference-Call for Papers 2011
SAMPE Journal - January/February 2011 - SAMPE LinkedIn Communities
SAMPE Journal - January/February 2011 - Advertiser’s Index
SAMPE Journal - January/February 2011 - 47
SAMPE Journal - January/February 2011 - Resource Center
SAMPE Journal - January/February 2011 - 49
SAMPE Journal - January/February 2011 - 50
SAMPE Journal - January/February 2011 - 51
SAMPE Journal - January/February 2011 - 52
SAMPE Journal - January/February 2011 - 53
SAMPE Journal - January/February 2011 - SAMPE Upcoming Conferences
SAMPE Journal - January/February 2011 - Industry Events Calendar
SAMPE Journal - January/February 2011 - 56
SAMPE Journal - January/February 2011 - Cover3
SAMPE Journal - January/February 2011 - Cover4
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