A vehicle body structure includes a front side member, a body attachment structure and an off-center impact structure. The front side member defines a hollow interior, an outboard wall and an inboard wall. The body attachment structure is attached to the outboard wall of the front side member. The off-center impact structure has a first end portion, a second end portion and a main section extending from the first end portion to the second end portion. The first end portion extends through an outboard forward opening and into the hollow interior of the front side member and is rigidly connected to the front side member forward of the body attachment structure. The second end portion is attached to the front side member at a location rearward of the body attachment structure with the main section extending outboard of the body attachment structure.

A vehicle body structure includes a front side member, a body attachment structure and an off-center impact structure. The front side member defines a hollow interior, an outboard wall and an inboard wall. The body attachment structure is attached to the outboard wall of the front side member. The off-center impact structure has a first end portion, a second end portion and a main section extending from the first end portion to the second end portion. The first end portion extends through an outboard forward opening and into the hollow interior of the front side member and is rigidly connected to the front side member forward of the body attachment structure. The second end portion is attached to the front side member at a location rearward of the body attachment structure with the main section extending outboard of the body attachment structure.

A vehicle underbody assembly including a pair of rockers, a pair of side rails, a first cross member, a second cross member, and a fuel tank is provided. Each of the pair of side rails is secured to a rearward portion of one of the rockers. The first cross member extends between the side rails and is thermally treated to form a first central hard strength zone between two first soft strength zones. The second cross member is arranged with the pair of side rails and the first cross member to form a rectilinear frame and is thermally treated to form a second central hard strength zone between two second soft strength zones. The fuel tank is secured between the pair of side rails so that the fuel tank is located within a rectilinear frame formed by the pair of side rails and the cross members.

A vehicle underbody assembly including a pair of rockers, a pair of side rails, a first cross member, a second cross member, and a fuel tank is provided. Each of the pair of side rails is secured to a rearward portion of one of the rockers. The first cross member extends between the side rails and is thermally treated to form a first central hard strength zone between two first soft strength zones. The second cross member is arranged with the pair of side rails and the first cross member to form a rectilinear frame and is thermally treated to form a second central hard strength zone between two second soft strength zones. The fuel tank is secured between the pair of side rails so that the fuel tank is located within a rectilinear frame formed by the pair of side rails and the cross members.

A vehicle underbody assembly including a pair of rockers, a pair of rear rails, a first cross member, and a second cross member is provided. Each of the pair or rear rails extends from one of the rockers and each includes a rear portion, a first mid-portion, a second mid-portion, and a forward portion. Each of the forward portions is secured to one of the rockers at one of a first joint and a second joint. The first cross member extends between the rear rails at a transition region between the second mid-portion and the forward portion. The second cross member extends between the rear rails at locations adjacent the first and second joints. Each of the rear rails is thermally treated so that the second mid-portions form a hard strength zone. The hard strength zone may further be defined as a zone having a fully martensitic microstructure.

A vehicle underbody assembly including a pair of rockers, a pair of rear rails, a first cross member, and a second cross member is provided. Each of the pair or rear rails extends from one of the rockers and each includes a rear portion, a first mid-portion, a second mid-portion, and a forward portion. Each of the forward portions is secured to one of the rockers at one of a first joint and a second joint. The first cross member extends between the rear rails at a transition region between the second mid-portion and the forward portion. The second cross member extends between the rear rails at locations adjacent the first and second joints. Each of the rear rails is thermally treated so that the second mid-portions form a hard strength zone. The hard strength zone may further be defined as a zone having a fully martensitic microstructure.

A body vehicle structure has a front side member, a power plant and an elongated member. The front side member has an outboard opening and an inboard opening open to a hollow interior. The outboard opening and the inboard opening are offset from one another relative to a front end of the front side member. The power plant is supported to the vehicle structure inboard of the front side member adjacent to the inboard opening. The elongated member extends through the outboard opening, the hollow interior, and the inboard opening of the front side member. In response to an impact event of an off-center impact test a front end of the elongated member adjacent and outboard relative to a front end of the front side member is impacted moving a rear end of the elongated member into contact with the vehicle power plant transmitting impacting force thereto.

A vehicle front structure includes side rails, rail tips, and a tension member. The side rails extend longitudinally in a front portion of the vehicle on left and right sides of a central longitudinal axis of the vehicle. The rail tips have a plurality of flat walls that define a hollow polygonal body disposed about a tip axis. The rail tips have proximal and distal ends. The proximal end is fixedly coupled to a forward terminal end of the side rail inboard of an outer quarter of a total vehicle width. The rail tip extends outboard and forward such that the distal end is disposed within the outer quarter. The flat walls have a forward wall thickness that is less than a rearward wall thickness. The tension member is fixedly coupled to the distal ends and spans laterally therebetween.

A vehicle front portion structure that includes: a first lateral connecting member that is disposed between a pair of left and right front side members, and that connects the pair of left and right front side members parallel to a vehicle transverse direction, wherein vehicle longitudinal direction positions of portions, to which the first lateral connecting member is joined, at the pair of left and right front side members coincide with vehicle longitudinal direction positions of portions, to which front side joining portions of a suspension member are joined, at the pair of left and right front side members.

A vehicle front portion structure that includes: a first lateral connecting member that is disposed between a pair of left and right front side members, and that connects the pair of left and right front side members parallel to a vehicle transverse direction, wherein vehicle longitudinal direction positions of portions, to which the first lateral connecting member is joined, at the pair of left and right front side members coincide with vehicle longitudinal direction positions of portions, to which front side joining portions of a suspension member are joined, at the pair of left and right front side members.