Prepreg laminate, composite structure, and method for manufacturing composite structure

A prepreg laminate comprising:

• a prepreg (A), in which non-continuous reinforcing fibers are impregnated with a thermosetting resin or thermoplastic resin, and
• a prepreg (B), in which non-continuous reinforcing fibers are impregnated with a thermoplastic resin,
• wherein:
• the prepreg (A) and the prepreg (B) are laminated adjacent to each other, with the prepreg (A) being disposed on at least one surface of the prepreg (B),
• the non-continuous reinforcing fibers included in the prepreg (B) are in a web form,
• the prepreg (A) has a plurality of incisions and the non-continuous reinforcing fibers included in the prepreg (A) are formed by cutting continuous reinforcing fibers unidirectionally aligned by the incisions to form fiber bundles unidirectionally aligned,
• the prepreg (B) has a plurality of incisions cutting at least some of the non-continuous reinforcing fibers in the web form,
• at least some combinations of the prepreg (A) and the prepreg (B) form an overlap region that satisfies at least one of (1) and (2) below:
• (1) a coefficient of variation in fiber length of the non-continuous reinforcing fibers included in the prepreg (B) is larger than a coefficient of variation in fiber length of the non-continuous reinforcing fibers included in the prepreg (A);
• and
• (2) the prepreg (B) has a plurality of incisions at which the non-continuous reinforcing fibers included in the prepreg (B) are cut, and an average value of a two-dimensional orientation angle of the non-continuous reinforcing fibers included in the prepreg (B) is larger than an average value of a two-dimensional orientation angle of the non-continuous reinforcing fibers included in the prepreg (A),
• wherein the overlap region is formed by overlapping an incised region where the incisions are formed in the prepreg (A) and an incised region where the incisions are formed in the prepreg (B), and
• wherein in the overlap region, when sums of incision lengths converted per 1 m2 of the prepreg (A) and the prepreg (B) are designated as Ca [m/m2] and Cb [m/m2], respectively, 0.1≤Cb/Ca<5 is satisfied.