PSI - Issue 72

Mohamed Khodjet Kesba et al. / Procedia Structural Integrity 72 (2025) 164–171

168

Table 2 – diffusion characteristics of T300/5208 [6]. Diffusivity (mm2/s) Maximum concentration T300/5208 D=132exp(-6750/T). Cm=0 .015HR

Table 3 – Resistance of graphite/epoxy [6].

Materials T300/5208

X(Mpa)

X’(Mpa)

Y(Mpa)

1500

1500

40

Materials T300/5208

Y’(Mpa)

S(Mpa)

246

68

5. Results To evaluate the effect of temperature and relative humidity on the behavior of composites during the absorption phase, we simulated the behavior of a T300/5208 laminate consisting of 8 layers [+45°/ -45°]2s. The total thickness of the laminate is 1 mm (0.125mm for each layer). The saturation time of the plate is about 4222 hours, we choose a simulation time equal to tsaturation / 10, t = 422 hours. Simulation includes change of operational temperature, reference temperature, operational humidity, reference humidity, with consideration and non-consideration of aging phenomena.

T=50°C+Aging T=30°C+Aging T=15°C+Aging

T=50°C T=30°C T=15°C

60,0Mpa

80,0Mpa

SIG X

SIG X

40,0Mpa

60,0Mpa

20,0Mpa

40,0Mpa

0,0pa

20,0Mpa

-0,6

-0,4

-0,2

0,0

0,2

0,4

0,6

Z(mm)

-20,0Mpa

0,0pa

-0,6

-0,4

-0,2

0,0

0,2

0,4

0,6

Z(mm)

-40,0Mpa

-20,0Mpa

-60,0Mpa

-40,0Mpa

-80,0Mpa

-60,0Mpa

T=50°C+Aging T=30°C+Aging T=15°C+Aging

T=50°C T=30°C T=15°C

60,0Mpa

80,0Mpa

SIG Y

SIG Y

40,0Mpa

60,0Mpa

20,0Mpa

40,0Mpa

0,0pa

20,0Mpa

-0,6

-0,4

-0,2

0,0

0,2

0,4

0,6

-0,6

-0,4

-0,2

0,0

0,2

0,4

0,6

Z(mm)

-20,0Mpa

Z(mm)

0,0pa

-40,0Mpa

-20,0Mpa

-60,0Mpa

-40,0Mpa

-80,0Mpa

Fig. 2: Stress behavior with operational temperature change (Aging/Non-Aging case, HR1=60%,HR2=25%).