A series of experiments were carried out for comparison under shear loading

including X-cor sandwich

foam sandwich and Z-pin sandwich

so as to investigate Z-pin enhancement effect on foam sandwich.By studying on the difference between test and formual data the modifed formula of shear modulus and strength was achieved.The result shows that shear properties are related to modulus stiffness discount M and time facotr T

indicating the beginning of Z-pin pull from face skin: M and T were affirmed by craft level.