Fatigue sensitivity determination procedure
AssigneeVisteon Global Technologies, Inc.
InventorsHong Su, Shang-Rou Hsieh
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Abstract
A method for determining the sensitivity of the fatigue life of a structural component with respect to specific design parameters includes obtaining the stress profile for a structural component under random process establishing a relationship between the stress profile and the fatigue life of the structural component, developing the sensitivity of the fatigue life with respect to design parameters, optimizing the design of the structural component based upon the design parameters to which the fatigue life is most sensitive.
Claims11
A method for determining the sensitivity of the fatigue life of a structural component with respect to specific design parameters comprising:
- obtaining an stress profile for a structural component under random excitation;
- establishing a relationship between the stress profile and the fatigue life of the structural component;
- and
- developing the sensitivity of the fatigue life with respect to the specific design parameters to determine which design parameter has the most significant impact upon the fatigue life of the component.
A method for determining the sensitivity of the fatigue life of a structural component with respect to specific design parameters comprising:
- collecting time domain dynamic loads in terms of stationary random process data;
- converting the time domain load data into the frequency domain data in terms of power spectral density functions by using a fast Fourier transformation technique;
- modeling the power spectral density load data as finite element analysis loads;
- building a finite element model based on structural design of the component and computer aided designs of the component;
- identifying finite element model hotspots using normal modal analysis;
- identifying specific design parameters for fatigue sensitivity determination based upon design parameters and component hotspots;
- generating a frequency response model for finite element analysis;
- perform random frequency response analysis;
- perform fatigue damage analysis based upon the power spectral density stress results, the material fatigue S-N properties and the damage model;
- establish a sensitivity analysis model and stress power spectral density moments and data;
- perform structural fatigue sensitivity analysis based on the sensitivity analysis model, the material fatigue S-N properties and the damage model;
- rank the fatigue sensitivity results with respect to the identified specific design parameters;
- identify the most sensitive and critical design parameters for design improvements and optimization.
Dependencies are inferred from the claim text.