LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART
Owing to the dispersion of material and structure property,the fatigue life of a structure part depends on all its high stress sites. A multi-site damage structure is a series system with many weak links（ damage sites） in probability sense.Therefore,the fatigue life（ a random variable） of a complex...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Journal of Mechanical Strength
2021-01-01
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| Series: | Jixie qiangdu |
| Subjects: | |
| Online Access: | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2021.02.026 |
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| author | TIAN HongLei SUN WeiGuang YANG WenChao XIE LiYang |
| author_facet | TIAN HongLei SUN WeiGuang YANG WenChao XIE LiYang |
| author_sort | TIAN HongLei |
| collection | DOAJ |
| description | Owing to the dispersion of material and structure property,the fatigue life of a structure part depends on all its high stress sites. A multi-site damage structure is a series system with many weak links（ damage sites） in probability sense.Therefore,the fatigue life（ a random variable） of a complex structure part with multiple damage sites will be less than the life of the weakest site on the part. Owing to test equipment and conditions,the loads and stress state of a test part cannot exactly reproduce the real structure part in service. The present paper analyzed fatigue life influence factors for a large-size structure part test,expressed the relationship between fatigue life and number of high stress sites,studied fatigue life equivalence method when changing the fully reversed cyclic load in service into pulsation cyclic load in test. Through damage site number based load level adjustment and mean stress modification,this paper provides a load equivalence method to simplify fatigue test of large size multisite-damage parts. The results indicate that through such load transformation,the loading frequency of the electric-hydraulic servo test system can be increase from 2 Hz to 4 Hz,while the fatigue life distribution of the tested part keeps nearly the same as that of the service part. |
| format | Article |
| id | doaj-art-8e1a3a1535c14a54b35e1521ef76d1df |
| institution | Kabale University |
| issn | 1001-9669 |
| language | zho |
| publishDate | 2021-01-01 |
| publisher | Editorial Office of Journal of Mechanical Strength |
| record_format | Article |
| series | Jixie qiangdu |
| spelling | doaj-art-8e1a3a1535c14a54b35e1521ef76d1df2025-01-15T02:26:22ZzhoEditorial Office of Journal of Mechanical StrengthJixie qiangdu1001-96692021-01-014343444130610459LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PARTTIAN HongLeiSUN WeiGuangYANG WenChaoXIE LiYangOwing to the dispersion of material and structure property,the fatigue life of a structure part depends on all its high stress sites. A multi-site damage structure is a series system with many weak links（ damage sites） in probability sense.Therefore,the fatigue life（ a random variable） of a complex structure part with multiple damage sites will be less than the life of the weakest site on the part. Owing to test equipment and conditions,the loads and stress state of a test part cannot exactly reproduce the real structure part in service. The present paper analyzed fatigue life influence factors for a large-size structure part test,expressed the relationship between fatigue life and number of high stress sites,studied fatigue life equivalence method when changing the fully reversed cyclic load in service into pulsation cyclic load in test. Through damage site number based load level adjustment and mean stress modification,this paper provides a load equivalence method to simplify fatigue test of large size multisite-damage parts. The results indicate that through such load transformation,the loading frequency of the electric-hydraulic servo test system can be increase from 2 Hz to 4 Hz,while the fatigue life distribution of the tested part keeps nearly the same as that of the service part.http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2021.02.026Multi-site-damageSerial systemFatigue testMean stress effectFatigue life equivalence |
| spellingShingle | TIAN HongLei SUN WeiGuang YANG WenChao XIE LiYang LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART Jixie qiangdu Multi-site-damage Serial system Fatigue test Mean stress effect Fatigue life equivalence |
| title | LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART |
| title_full | LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART |
| title_fullStr | LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART |
| title_full_unstemmed | LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART |
| title_short | LOAD EQUIVALENCE TEST METHOD FOR FATIGUE LIFE OF MULTI-SITE-DAMAGE LARGE SIZE STRUCTURE PART |
| title_sort | load equivalence test method for fatigue life of multi site damage large size structure part |
| topic | Multi-site-damage Serial system Fatigue test Mean stress effect Fatigue life equivalence |
| url | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2021.02.026 |
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