SIDE SILL ASSEMBLY OF VEHICLE WITH REINFORCED STIFFNESS AND METHOD FOR MANUFACTURING THE SAME

A side sill assembly of a vehicle with reinforced stiffness includes a side sill inner, a side sill outer, and a reinforcement unit provided between the side sill inner and the side sill outer. The reinforcement unit includes an upper member having a first upper surface and a first lower surface located lower than the first upper surface, wherein the first upper surface and the first lower surface are alternately disposed in a longitudinal direction of the vehicle; a lower member having a second upper surface and a second lower surface located lower than the second upper surface, wherein the second upper surface and the second lower surface are alternately disposed in the longitudinal direction of the vehicle; and an intermediate member bonded to the upper member and the lower member, respectively, between the upper member and the lower member.