Sensitivity Analysis of a CPAM Inverse Algorithm for Composite Laminates Characterization

Table 9

Simultaneous determination of material constants and stacking sequence for composite specimens.

(a)

Specimens	(GPa)	(GPa)		(GPa)	(GPa)
Reference [12]	121.2	9.34	0.23	6.25	3.6
Hwang and Chang [8]
B1	125.5 (4%)	8.55 (−8.4%)	0.34 (47.8%)	5.4 (−13.6%)
B2	128.7 (6.2%)	8.10 (−13.2%)	0.33 (43.4%)	6.05 (−3.2%)
C1	123.7 (2%)	9.96 (6.6%)	0.35 (52.2%)	6.85 (9.6%)
C2	120.2 (−1%)	9.96 (6.6%)	0.35 (52.2%)	6.85 (9.6%)
D1	120.0 (−1%)	9.60 (2.8%)	0.21 (−8.6%)	5.70 (−8.8%)	2.9 (−19.4%)
D2	120.0 (−1%)	9.00 (−3.6%)	0.30 (30.4%)	7.10 (13.6%)	2.5 (−3.5%)
Present method
Carbon/epoxy
B1	122.3 (1%)	9.12 (−2.3%)	0.25 (8.6%)	6.43 (2.8%)
B2	123.8 (2.1%)	9.63 (3.1%)	0.26 (13.4%)	6.48 (3.7%)
C1	126.5 (4.3%)	9.47 (1.3%)	0.24 (4.3%)	6.58 (5.3%)
C2	125.7 (3.7%)	9.44 (1%)	0.25 (8.6%)	6.57 (5.1%)
D1	120.6 (−1%)	9.86 (5.5%)	0.22 (−4.3%)	5.87 (9.9%)	3.3 (−8.3%)
D2	120.2 (−1%)	9.01 (−3.5%)	0.25 (8.6%)	6.36 (1.7%)	3.4 (−5.55%)
Glass/epoxy
C3	41.7 (4%)	8.71 (−2.1%)	0.25 (8.7%)	4.41 (4.3%)
C4	41.3 (2.9%)	8.53 (−4.1%)	0.24 (4.3%)	4.38 (3.5%)
D3	39.4 (−1.7%)	9.14 (2.7%)	0.25 (8.7%)	4.18 (−1.1%)	3.3
D4	39.6 (−1.2%)	9.26 (4%)	0.26 (13%)	4.12 (−2.6%)	3.2

(b)

Thin plates	Stacking sequence	Thick plates	Stacking sequence
B1		D1
B2		D2
C1		D3
C2		D4
C3		G1
C4		G2
F1
F2