nCode DesignLife is an up-front design tool that identifies critical locations for performing fatigue analysis from leading FEA results data, including ANSYS. Workshop / Tutorial 1: Introduction to the ANSYS nCode DesignLife Interface Workshop / Tutorial 2: Constant amplitude Stress life fatigue analysis. Workshop .
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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. The Seam Dexignlife option enables the fatigue analysis of seam welded joints including fillet, overlap, and laser welded joints.
nCode DesignLife – CAE Fatigue Analysis Software – nCode
Simulate vibration tests driven by random PSDswept sine, sine dwell or sine-on-random loading Predict damage and life per layer and integration futorials Incorporate results of manufacturing simulation including fibre orientation tensors or residual stresses Model local fatigue properties based on microstructure orientation tensor and stress state Calculate fatigue based on principal stresses or critical plane — including stresses calculated from FE-Digimat and multiaxial stress states Choice of fatigue property model – SN curve interpolation or interface to Digimat Use of homogenized matrix or fibre stresses as well as typical composite ones.
The Short Fibre Composite option uses stress-life fatigue calculations for anisotropic materials such as glass fibre filled thermoplastics. The method is based on the approach developed by Volvo see also SAE paper and validated through years of use on vehicle chassis and body development projects. The Strain-Life method is applicable to a wide range of problems including low-cycle fatigue with the local elastic-plastic strain controls the fatigue life.
A standard database with fatigue properties for many tutrials used materials is included.
Although this is primarily a CAE based analysis, the same method may also be applied to measured stress data. Distributed Processing enables a DesignLife analysis running in batch mode to be distributed across multiple computers or nodes of a computer cluster. This method is widely used as a key design criteria for engine and powertrain components like crankshafts, camshafts and pistons. They then ran the thermal-stress analysis again with the new design, exported the stresses to nCode DesignLife, and combined the results with a material model and a description of the repetitive loading that the product is expected to undergo during operation.
Adhesive bonds are modeled with beam elements and grid point forces are used to designlifw line forces and moments at the edge of the glued flange. The Composite Analysis option allows users to evaluate the strength of a structure against industry standard composite failure criteria.
Processing threads enable you to get finished results from raw inputs in faster. The stress tensor for each layer and anssy integration ncove through the thickness is read by DesignLife from FE results. Stresses from a complete finite element model are analyzed in a single analysis process.
Crack Growth Provides a complete fracture mechanics capability using industry standard methodologies for specified locations on an FE model. Enables vibration specification data to be entered, edited, and viewed.
ANSYS nCode DesignLife
Fatigue Analysis using FEA Results Design for Durability Attendees looking to learn more about designlice background of fatigue theory are encouraged to attend our 2-day desighlife called Practical Fatigue Theory. Rather than limiting this evaluation to a small number of load cases or steps, stresses can be assessed by using the chosen failure criteria throughout realistic duty cycles quasi-static or dynamic.
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Structural stress at the weld toe, the hot-spot stress can be estimated by the extrapolation of the surface stress at points near the weld Supports BS welding standard, together with required material curves Enables vibration specification data to be entered, edited, and viewed. Since the fatigue calculation at each model location is effectively independent, the benefit to adding additional processing threads is very scalable. This feature makes it easy to create a composite duty cycle with repeats.
Material inputs are standard mean stress corrections or user-specified Haigh diagrams to assess durability. This enables the ability to interpolate multiple material data curves for factors such as mean stress or temperature.
Engineers without fatigue expertise can evaluate modified product designs to determine the updated product life. A standard database containing over vibration entries is included. Further options are also provided to account for stress gradients and surface finishes. Biaxial 3D Multiaxial Auto-correction. Includes a batch interface program to simplify the running of distributed jobs. Material models can also be defined using general look-up curves. Product options containing functions for virtual shaker testing, fatigue of welds, vibration fatigue, crack growth detection, fatigue of composites, thermo-mechanical fatigue analysis and more are described below.
Introduction to ANSYS nCode DesignLife
The output from the analysis is expressed as a safety factor rather than fatigue life. Short Fibre Composite module features: 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.
Manufacturing effects can be accounted for by using equivalent plastic strain in the unloaded component. Start-to-end automation avoids ndode majority of errors and ensures consistency, especially in large organizations in which multiple engineers might be analyzing the results.