Impact-absorbing system for automotive vehicle

An interior material for an automotive vehicle, comprising:

• a main body section formed of plastic, said main body section configured to be fixedly connected to a vehicle body at a side of a passenger compartment;
• and
• at least one energy absorbing rib which is fixed to and extends from the main body section along a plane perpendicular to a longitudinal axis of said main body section, said rib being generally plate-shaped and having an edge configured to face the vehicle body, said rib being formed with a cutout groove which opens to the edge and extends toward a surface of said main body section to which a surface of said rib is fixed,
• wherein said energy absorbing rib starts to tear from said cutout groove and collapses to absorb an impact load applied to said main body section when the impact load is applied in a direction that said main body section approaches the vehicle body, said cutout groove serving as a starting point for tearing said energy absorbing rib,
• wherein the edge of said energy absorbing rib has a first straight edge, and a second straight edge which is perpendicular to the first straight edge, wherein said cutout groove is defined by parallel first and second inner edges forming part of said rib, the first and second inner edges being perpendicular to the first straight edge, the second inner edge being aligned with the second straight edge,
• wherein the first straight edge and the first inner edge are contiguous to each other to form a rounded corner of the edge of said energy absorbing rib so that the first inner edge starts to curve from a position which is separate by a predetermined distance from a bottom of said cutout groove, wherein said cutout groove has a width ranging from 1 mm to 4 mm, and a depth not larger that a value (the predetermined distance×1.5) mm.