To study the impact resistance performances of resin matrix composite joints reinforced by Z-pin

single lap joint specimens reinforced by Z-pin were prepared. The crack propagation along Z-pin/laminates interface was compared with different resins matrix of Z-pin. Z-pin pullout and lap shear tests were carried out to study the after-impact pullout strength of Z-pin and after-impact shear strength of single lap joint

respectively. The ultrasonic C-scan method combined with finite element simulation was utilized to explore the delamination damage area of joint interface. The results showed that compared with the BMI resin matrix Z-pin

the resistance performance between epoxy Z-pin/epoxy laminates was stronger at the same impact energy. With the increase of impact energy

the crack propagation was more significant. Z-pin reinforced resin matrix composites remarkably reduced delamination damage area and improved the after-inpact shear strength. The delamination damage area of joint reinforced by Z-pin was 40%

and its reduction of after-impact shear strength was 24.89% when Z-pins volume fraction was 1.5% and diameter was 0.5mm.With the increase of Z-pin volume fraction

the delamination damage area decreased gradually

while the after-impact shear strength increased firstly and then decreased. The damage area of lap surface increased as the increment of Z-pin diameter while the after-impact shear strength decreased. The results of finite element modeling were consistent with the test results.