Fig.1

Schematic diagram of compression test piece

Fig.2

Physical diagram of compression test piece

Table 1

Material name and its corresponding number

Table 2

Quasi-static compression test matrix of composite laminates with single delamination damage

Fig.3

Quasi-static compression testing machine and test clamping diagram

Fig.4

Failure mode of quasi-static compression test

Fig.5

Quasi-static compression load displacement curves

Table 3

Statistics of quasi-static compression test results of composite laminates with single delamination damage

Fig.6

Comparison of quasi-static compressive failure strength of composite laminates with single delamination damage

Table 4

Material parameters of unidirectional tape （M2） of T800 composite material

Table 5

Interlaminar mechanical properties

Fig.7

Prefabricated circular layered damage schematic diagram

Fig.8

Quasi-static compression finite element model of laminated plates with delamination damage

Fig.9

Different mesh sizes

Fig.10

Compression failure load under different mesh sizes

Fig.11

Damage evolution simulation contour

Fig.12

Four damage modes

Table 6

Comparison of quasi-static compression failure loads of M2 composite laminates with delamination damage

Fig.13

Effect of delamination depth on the compressive properties of M2 composite laminate

Fig.14

Mechanical response of two sub-plates when the delamination is located between 2 and 3 layers

Fig.15

Mechanical response of two sub-plates when the delamination is located between 6 and 7 layers

Fig.16

Mechanical response of two daughter plates when the layer is located between 8 and 9 layers

Table 7

Comparison of failure loads

Fig.17

Impact damage simulation ccontour of composite laminates

Table 8

Impact and post-impact compression test matrix

Fig.18

Low speed impact testing machine and test piece clamping

Fig.19

Impact damage C-scan results

Fig.20

Oven drying

Fig.21

Testing machine and test clamping of compression after impact

Fig.22

Strain gauge paste and strain gauge

Fig.23

Failure mode of compression after impact

Fig.24

Compression load displacement curves of composite laminates after impact

Table 9

Statistics of failure load and residual strength of compression after impact

Fig.25

Comparison of compression residual strength of composite laminate after impact