560
H. Najmi et al.
Fig. 4 Evolution of heat release rate, gaseous product of combustion and back face temperature
for paint, laminate and honeycomb structure
The decomposition parameters tabulated in Table 2 confirm that the honeycomb
structure is completely destroyed by the end of the test. The honeycomb has shrunk
by the end of the test and its final dimension is found to be 4 × 4 cm
2 . The mass
loss percentage of laminate indicates the amount of phenolic resin present in it and
the remaining mass is roughly equal to the glass fiber content. In previous studies,
it is found that the phenolic resin is completely decomposed at 600 °C [9] while the
glass fiber remains intact up to 1000 °C [16]. Hence from the first phase of the study,
the decomposition of single materials and gases emitted during their decomposition
process are well understood. This will help in identifying which materials are taking
part in the thermal decomposition process when different assemblies are studied at
the same incident flux.
In the second phase, different assemblies are made by using phase one materials
(i.e. paint, laminate, and honeycomb) in order to study the change in the thermal
decomposition process due to the addition of one material to another. To do so,
Table 2 Experimentally determined thermal decomposition parameters of paint, laminate and
honeycomb structure
Materials
PHRR
THR
CO 2
I.T
PBT
M.L
kW/m 2
kJ/m 2
g/g
s
°C
%
Paint
177.7
1488.9
12.6
36–42
580.7
61.5
Laminate
164.1
4828.5
3.8
21–42
664.0
28.5
Honeycomb
218.2
15669.5
1.8
15–495
864.7
99.2
*PHRR-peak heat release rate, THR-total heat release rate (for first 300 s), I.T-ignition time (flame
in and flame-out), PBT-peak back surface temperature, M.L-mass loss
H. Najmi et al.
Fig. 4 Evolution of heat release rate, gaseous product of combustion and back face temperature
for paint, laminate and honeycomb structure
The decomposition parameters tabulated in Table 2 confirm that the honeycomb
structure is completely destroyed by the end of the test. The honeycomb has shrunk
by the end of the test and its final dimension is found to be 4 × 4 cm
2 . The mass
loss percentage of laminate indicates the amount of phenolic resin present in it and
the remaining mass is roughly equal to the glass fiber content. In previous studies,
it is found that the phenolic resin is completely decomposed at 600 °C [9] while the
glass fiber remains intact up to 1000 °C [16]. Hence from the first phase of the study,
the decomposition of single materials and gases emitted during their decomposition
process are well understood. This will help in identifying which materials are taking
part in the thermal decomposition process when different assemblies are studied at
the same incident flux.
In the second phase, different assemblies are made by using phase one materials
(i.e. paint, laminate, and honeycomb) in order to study the change in the thermal
decomposition process due to the addition of one material to another. To do so,
Table 2 Experimentally determined thermal decomposition parameters of paint, laminate and
honeycomb structure
Materials
PHRR
THR
CO 2
I.T
PBT
M.L
kW/m 2
kJ/m 2
g/g
s
°C
%
Paint
177.7
1488.9
12.6
36–42
580.7
61.5
Laminate
164.1
4828.5
3.8
21–42
664.0
28.5
Honeycomb
218.2
15669.5
1.8
15–495
864.7
99.2
*PHRR-peak heat release rate, THR-total heat release rate (for first 300 s), I.T-ignition time (flame
in and flame-out), PBT-peak back surface temperature, M.L-mass loss