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3 STRUCTURES / nCode Design Code // / Solver Engines – Advanced Seam Weld - Simplifies the process of setting up fatigue analysis of seam welds by intelligently identifying weld lines in the FEA Model. Covers seam welded joints including fillet, overlap and laser welded joints. This method is based on the approach developed by Volvo (see SAE paper 982311). Stresses can either be taken directly f rom FEA models (shell or solid elements) or calculated f rom grid point forces or displacements at the weld. The approach is appropriate for weld toe, root and throat failures. Thick welds are assessed using the stress integration method outlined in ASME Boiler & Pressure Vessel Code VIII (Division 2) standard. The BS7608 welding standard is also supported, together with required material curves. Spot Weld - Enables fatigue analysis of spot welds in thin sheets. This method is based on the LBF method (SAE paper 950711). Cross sectional forces and moments are used to calculate structural stress around the edge of the weld. Life calculations are made around a spot weld at multiple angle increments and the total life reported includes the worst case. Python scripting enables modeling of other joining methods such as rivets or bolts. Vibration Fatigue - Enables prediction of fatigue in the f requency domain and is more realistic and efficient than time-domain analysis for many applications with random loading, such as wind and wave loads. Simulates vibration shaker tests driven by random PSD, swept-sine, sine-dwell or sine-on-random loading. Vibration fatigue loads can be used for SN, EN, seam weld or spot weld. Vibration loading can include the effect of temperature, static offset load cases and complete duty cycles of combined loading. Thermomechanical Fatigue - Enables high temperature fatigue and creep analysis by using stress and temperature results f rom finite element simulations. Mechanical loads that vary at a different rate than the temperature variations can also be combined. Applications include components that are both mechanically and thermally loaded such as vehicle exhaust systems and manifolds. TMF includes high temperature fatigue methods such as Chaboche and Chaboche Transient and Creep analysis methods, Larson-Miller and Chaboche creep. Adhesive Bonds - Enables f racture-mechanics-based method to assess which joints in the structure are most critically loaded. The Adhesive Bonds option enables durability calculations on adhesive joints in metallic structures. 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. 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. 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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