Adhesive Bonds


Adhesive bonding is increasingly used in the development of lightweight vehicle bodies to give improved structural rigidity with good durability. DesignLife uses a fracture mechanics-based method to assess which joints in the structure are most critically loaded. Adhesive bonds are modeled with beam elements and grid point forces are used to determine line forces and moments at the edge of the glued flange.
This enables approximate calculations of the strain energy release rate (the equivalent J-integral) to be made at the edge of the adhesive and, by comparison to the crack growth threshold, a safety factor (design reserve factor) may also be calculated. J-integral values calculated    for different geometries and loadings have been shown to provide good correlation for the durability of joints, particularly at longer lives, enabling useful estimations of joint durability to be made.
        
  • Adhesive bonds are modeled with beam elements and grid point forces are used to determine line forces and moments at the edge of the glued flange.
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  • Approximate calculations of the strain energy release rate are made at the edge of the adhesive and, by comparison to the crack growth threshold, a safety factor is calculated.
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  • The theoretical basis of the method was developed by the Volvo Group and the testing and software implementation was carried out as part of a collaborative research project with partners including Jaguar Land Rover, Coventry University and Warwick University.
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