Variation simulation of stress during assembly of composite parts

Weight reduction requirements in aerospace and automotive industry lead to an increased use of composite materials. However, composite parts cannot be bent like sheet metal parts. Hence, only low forces can be applied to close gaps between parts, caused by geometrical variation in parts and assembly fixtures. Shimming is therefore used to compensate for bad fitting, with increase cost as a consequence. This paper investigates how variation in assembly fixtures and parts give rise to variation in gaps and thereby also to variation in stress. Monte Carlo simulations are used to find the distribution of stress, which supports shimming strategies.

[1]  Roberto Teti,et al.  Machining of Composite Materials , 2002 .

[2]  Stephen W. Tsai,et al.  Anisotropic strength of composites , 1965 .

[3]  Rikard Söderberg,et al.  Strategies for Optimization of Spot Welding Sequence With Respect to Geometrical Variation in Sheet Metal Assemblies , 2010 .

[4]  S. Tsai,et al.  Introduction to composite materials , 1980 .

[5]  Rikard Söderberg,et al.  Computer-aided robustness analysis for compliant assemblies , 2006 .

[6]  Rikard Söderberg,et al.  Managing physical dependencies through location system design , 2006 .

[7]  Samuel C Lorin,et al.  Increased precision in variation simulation by considering effects from temperature and heat , 2014 .

[8]  W. Van Paepegem,et al.  Induced drilling strains in glass fibre reinforced epoxy composites , 2013 .

[9]  Lars Lindkvist,et al.  Variation Simulation of Sheet Metal Assemblies Using the Method of Influence Coefficients With Contact Modeling , 2007 .

[10]  Rikard Söderberg,et al.  Method for Handling Model Growth in Nonrigid Variation Simulation of Sheet Metal Assemblies , 2014, J. Comput. Inf. Sci. Eng..

[11]  As Kaddour,et al.  Maturity of 3D failure criteria for fibre-reinforced composites: Comparison between theories and experiments: Part B of WWFE-II , 2013 .

[12]  S. Jack Hu,et al.  Variation simulation for deformable sheet metal assemblies using finite element methods , 1997 .

[13]  Ekkard Brinksmeier,et al.  Drilling of Multi-Layer Composite Materials consisting of Carbon Fiber Reinforced Plastics (CFRP), Titanium and Aluminum Alloys , 2002 .

[14]  Kristina Wärmefjord,et al.  Variation Control in Virtual Product Realization - A Statistical Approach , 2011 .

[15]  Rikard Söderberg,et al.  Variation Simulation of Stresses Using the Method of Influence Coefficients , 2014, J. Comput. Inf. Sci. Eng..

[16]  Rikard Söderberg,et al.  Variation Simulation for Composite Parts and Assemblies Including Variation in Fiber Orientation and Thickness , 2014 .

[17]  Andreas Vlahinos,et al.  Body-in-White Weight Reduction via Probabilistic Modeling of Manufacturing Variations , 2001 .

[18]  Jaime A. Camelio,et al.  Modeling Variation Propagation of Multi-Station Assembly Systems With Compliant Parts , 2003 .

[19]  Isaac M Daniel,et al.  Failure of Composite Materials , 2007 .

[20]  Andreas Vlahinos,et al.  Designing for Six-Sigma Quality with Robust Optimization Using CAE , 2002 .

[21]  Rikard Söderberg,et al.  Computer Aided Assembly Robustness Evaluation , 1999 .

[22]  Rikard Söderberg,et al.  Tolerance Simulation of Compliant Sheet Metal Assemblies Using Automatic Node-Based Contact Detection , 2008 .