SYSTEMS AND METHODS TO ESTIMATE NOMINAL STRESS USING FINITE ELEMENT CALCULATED STRESS
First Claim
1. A method comprising:
- using finite element (FE) analysis to calculate stresses at a plurality of points from a base point along a base line of a structural component;
identifying two or more points of the plurality of points having a calculated stress that is determined to be unaffected by stress raising effects at the base point; and
estimating a nominal stress at the base point by extrapolating calculated stresses of the two or more points of the plurality of points to the base point.
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Abstract
Systems and methods described herein are configured to estimate nominal stress using finite element (FE) stress calculations, without hand calculations, specific mesh density requirements, or identifying specific geometric parameters such as plate thickness. The systems and methods described herein may be utilized to identify nominal stress in welded structures and components, and also in non-welded components that have stress raisers due to other causes. The systems and methods described herein also allow readily available FE stress results to be utilized in a consistent manner, as well as providing user feedback regarding the accuracy of the nominal stress approximations. Furthermore, the systems and methods described herein are generally faster and less error prone than conventional techniques, and are relatively insensitive to mesh density of the FE stress calculations.
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23 Claims
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1. A method comprising:
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using finite element (FE) analysis to calculate stresses at a plurality of points from a base point along a base line of a structural component; identifying two or more points of the plurality of points having a calculated stress that is determined to be unaffected by stress raising effects at the base point; and estimating a nominal stress at the base point by extrapolating calculated stresses of the two or more points of the plurality of points to the base point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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using finite element (FE) analysis to calculate stresses at a plurality of points from a base point along a base line of a structural component; identifying two or more points of the plurality of points by evaluating second derivatives of calculated stress for adjacent points of the plurality of points; and estimating a nominal stress at the base point by extrapolating calculated stresses of the two or more points of the plurality of points to the base point. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A non-transitory computer readable medium comprising instructions for estimating nominal stresses, wherein the instructions are configured to:
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use finite element (FE) analysis to calculate stresses at a plurality of points from a base point along a base line of a structural component; identify two or more points of the plurality of points by evaluating second derivatives of calculated stress for adjacent points of the plurality of points; and estimate a nominal stress at the base point by extrapolating calculated stresses of the two or more points of the plurality of points to the base point. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification