Sandwich Structured Composites for Aeronautics: Methods of Manufacturing Affecting Some Mechanical Properties

Table 4

Measurement results of properties at flexural test.

Method of producing composite	Hand lay-up				Press		Autoclave
Type of panel	T2	T3	M2	M4	P2	P3	A2	A3
Flexural strength, MPa	3.67	3.72	6.22	7.26	3.03	3.54	3.18	4.02
Standard deviation of strength, MPa	0.54	0.31	0.94	1.26	0.40	0.18	0.15	0.21
modulus, MPa	359	350	301	301	343	350	360	402
Standard deviation of modulus, MPa	59.5	31.8	24.2	24	36.9	10.8	28.2	10.2
Deflection at maximum strength, %	1.3	4.1	2.3	2.8	6.2	2.7	0.9	1.1
Standard deviation of deflection, %	0.3	7.4	0.3	0.8	6.0	4.1	0.02	0.1