On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength
The aim of the present paper is to systematically investigate the accuracy of the so-called Modified Wöhler Curve Method (MWCM) in estimating high-cycle fatigue strength of plain and notched engineering materials damaged by in-service multiaxial load histories. In more detail, the MWCM, which is a b...
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Gruppo Italiano Frattura
2011-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero16/numero_16_art_1.pdf |
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| author | Luca Susmel |
| author_facet | Luca Susmel |
| author_sort | Luca Susmel |
| collection | DOAJ |
| description | The aim of the present paper is to systematically investigate the accuracy of the so-called Modified Wöhler Curve Method (MWCM) in estimating high-cycle fatigue strength of plain and notched engineering materials damaged by in-service multiaxial load histories. In more detail, the MWCM, which is a bi-parametrical critical plane approach, postulates that initiation and Stage I propagation of fatigue cracks occur on those material planes experiencing the maximum shear stress amplitude (this being assumed to be always trueindependently from the degree of multiaxiality of the applied loading path). Further, the fatigue damage extent is hypothesised to depend also on the maximum stress perpendicular to the critical plane, the mean normal stress being corrected through the so-called mean stress sensitivity index (i.e., a material constant capable of quantifying the sensitivity of the assessed material to the presence of superimposed static stresses). In the present investigation, the overall accuracy of the MWCM in estimating high-cycle fatigue strength was checked through 704 endurance limits taken from the literature and generated, under multiaxial fatigue loading, by testing both plain and notched samples made of 71 different materials. Such a massive validation exercise allowed us to prove that the MWCM is highly accurate, resulting in 95% of the estimates falling within an errorinterval equal to ±15%. |
| format | Article |
| id | doaj-art-cdd0646e4a374aa781bd8d84aedb726f |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2011-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-cdd0646e4a374aa781bd8d84aedb726f2025-01-03T00:46:18ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932011-04-01516517On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strengthLuca SusmelThe aim of the present paper is to systematically investigate the accuracy of the so-called Modified Wöhler Curve Method (MWCM) in estimating high-cycle fatigue strength of plain and notched engineering materials damaged by in-service multiaxial load histories. In more detail, the MWCM, which is a bi-parametrical critical plane approach, postulates that initiation and Stage I propagation of fatigue cracks occur on those material planes experiencing the maximum shear stress amplitude (this being assumed to be always trueindependently from the degree of multiaxiality of the applied loading path). Further, the fatigue damage extent is hypothesised to depend also on the maximum stress perpendicular to the critical plane, the mean normal stress being corrected through the so-called mean stress sensitivity index (i.e., a material constant capable of quantifying the sensitivity of the assessed material to the presence of superimposed static stresses). In the present investigation, the overall accuracy of the MWCM in estimating high-cycle fatigue strength was checked through 704 endurance limits taken from the literature and generated, under multiaxial fatigue loading, by testing both plain and notched samples made of 71 different materials. Such a massive validation exercise allowed us to prove that the MWCM is highly accurate, resulting in 95% of the estimates falling within an errorinterval equal to ±15%.http://www.gruppofrattura.it/pdf/rivista/numero16/numero_16_art_1.pdfMultiaxial fatigueCritical plane approachHigh-cycle fatigue strengthNotch |
| spellingShingle | Luca Susmel On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength Fracture and Structural Integrity Multiaxial fatigue Critical plane approach High-cycle fatigue strength Notch |
| title | On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength |
| title_full | On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength |
| title_fullStr | On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength |
| title_full_unstemmed | On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength |
| title_short | On the overall accuracy of the Modified Wöhler Curve Method in estimating high-cycle multiaxial fatigue strength |
| title_sort | on the overall accuracy of the modified wohler curve method in estimating high cycle multiaxial fatigue strength |
| topic | Multiaxial fatigue Critical plane approach High-cycle fatigue strength Notch |
| url | http://www.gruppofrattura.it/pdf/rivista/numero16/numero_16_art_1.pdf |
| work_keys_str_mv | AT lucasusmel ontheoverallaccuracyofthemodifiedwohlercurvemethodinestimatinghighcyclemultiaxialfatiguestrength |