Stiffening structure and stiffening method for automotive door panel part

A stiffening structure of an automotive door panel part comprising:

• a door panel part configured to curve along a height direction, the door panel part including:
• a door outer panel;
• and
• a door inner panel, where a material of the door outer panel and the door inner panel is a combination of one of metal and metal, resin and resin, metal and resin, and resin and metal;
• a character line formed on the door panel part;
• an impact beam provided at a side of an inner surface of the door panel part;
• and
• a stiffening member made of resin, the stiffening member being configured to attach to the inner surface of the door panel part, wherein
• the stiffening member includes vertical bone portions configured to extend from the impact beam to the character line along the curve of the door panel part, one end of the vertical bone portion being placed at the impact beam and formed so as to fill a gap between the inner surface of the door part and the impact beam, and the other end of the vertical bone portion being placed at the character line, and
• the vertical bone portions are provided at a predetermined interval in a front-rear direction of the door panel part, and are bonded to the inner surface of the door panel part.

A method of stiffening an automotive door panel part made of a metal sheet, the method improving tensile rigidity of the automotive door panel part, and comprising:

• acquiring a door panel part model by modelling a door panel part using a two-dimensional element and/or a three-dimensional element;
• connecting a stiffening member model being a target of optimization analysis to the door panel part model;
• performing optimization analysis for obtaining an optimal shape of the stiffening member model;
• manufacturing a stiffening member that bonds to the inner surface of the door panel part, based on the optimal shape of the stiffening member model;
• and
• bonding the manufactured stiffening member to the inner surface of the door panel part, wherein
• the manufactured stiffening member includes vertical bone portions that extend from an impact beam provided on a side of the inner surface of the door panel part to a character line formed on the door panel part, along the curve of the door panel part in the height direction, one end of the vertical bone portion being placed at the impact beam and formed so as to fill a gap between the inner surface of the door part and the impact beam, and the other end of the vertical bone portion being placed at the character line, and
• the vertical bone portions are provided at a predetermined interval in a front-rear direction of the door panel part.

A method of stiffening an automotive door panel part that improves tensile rigidity of the automotive door panel part, the door panel part including a door outer panel and a door inner panel, where a material of the door outer panel and the door inner panel is a combination of one of metal and metal, resin and resin, metal and resin, and resin and metal, the method comprising:

• acquiring a door panel part model by modelling a door panel part using a two-dimensional element and/or a three-dimensional element;
• connecting a stiffening member model being a target of optimization analysis to the door panel part model;
• performing optimization analysis for obtaining an optimal shape of the stiffening member model;
• manufacturing a stiffening member that bonds to the inner surface of the door panel part, based on the optimal shape of the stiffening member model;
• and
• bonding the manufactured stiffening member to the inner surface of the door panel part, wherein
• the manufactured stiffening member includes vertical bone portions that extend from an impact beam provided on a side of the inner surface of the door panel part to a character line formed on the door panel part, along the curve of the door panel part in the height direction, one end of the vertical bone portion being placed at the impact beam and formed so as to fill a gap between the inner surface of the door part and the impact beam, and the other end of the vertical bone portion being placed at the character line, and
• the vertical bone portions are provided at a predetermined interval in a front-rear direction of the door panel part.