Cycle sequence sensitivity of near threshold fatigue under programmed loading – A fractographic study
[Display omitted] •Crack growth rates as low as 10−8 mm/cycle can be marked by suitable design of experiment.•Fractographic evidence confirms cycle-sequence sensitivity of near-threshold crack growth.•Reversal of peak-valley sequence of preceding larger cycle dramatically affects fatigue threshold.•...
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| Veröffentlicht in: | International journal of fatigue 2020-06, Vol.135, p.105537-11, Article 105537 |
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| container_title | International journal of fatigue |
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| creator | Sunder, R. |
| description | [Display omitted]
•Crack growth rates as low as 10−8 mm/cycle can be marked by suitable design of experiment.•Fractographic evidence confirms cycle-sequence sensitivity of near-threshold crack growth.•Reversal of peak-valley sequence of preceding larger cycle dramatically affects fatigue threshold.•Cycle-sequence sensitivity demands modeling for crack growth under long duration load spectra.
Statistically representative programmed block renditions of a transport aircraft wing load spectrum were used to study cycle sequence effects on near-threshold fatigue crack growth rate. Less frequent higher load cycles served as markers that permitted unambiguous estimation of crack growth rate under individual load levels in the load spectrum. Small cycle crack growth rates down to threshold levels are extremely sensitive to the peak-valley sequence of preceding large load cycle, suggesting the need to model the effect of near-tip residual stress on threshold stress intensity in handling load spectra with a large statistical content of smaller load cycles. |
| doi_str_mv | 10.1016/j.ijfatigue.2020.105537 |
| format | Article |
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•Crack growth rates as low as 10−8 mm/cycle can be marked by suitable design of experiment.•Fractographic evidence confirms cycle-sequence sensitivity of near-threshold crack growth.•Reversal of peak-valley sequence of preceding larger cycle dramatically affects fatigue threshold.•Cycle-sequence sensitivity demands modeling for crack growth under long duration load spectra.
Statistically representative programmed block renditions of a transport aircraft wing load spectrum were used to study cycle sequence effects on near-threshold fatigue crack growth rate. Less frequent higher load cycles served as markers that permitted unambiguous estimation of crack growth rate under individual load levels in the load spectrum. Small cycle crack growth rates down to threshold levels are extremely sensitive to the peak-valley sequence of preceding large load cycle, suggesting the need to model the effect of near-tip residual stress on threshold stress intensity in handling load spectra with a large statistical content of smaller load cycles.</description><identifier>ISSN: 0142-1123</identifier><identifier>EISSN: 1879-3452</identifier><identifier>DOI: 10.1016/j.ijfatigue.2020.105537</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Crack propagation ; Fatigue failure ; Fractography ; Fracture mechanics ; Load interaction effects ; Marker bands ; Materials fatigue ; Residual stress ; Spectrum load crack growth ; Threshold stress ; Threshold stress intensity ; Transport aircraft ; Wings (aircraft)</subject><ispartof>International journal of fatigue, 2020-06, Vol.135, p.105537-11, Article 105537</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Jun 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-cf2aa8cad865d4ae29543692b39aac92130478a595f855f5c78bc41f15f818873</citedby><cites>FETCH-LOGICAL-c343t-cf2aa8cad865d4ae29543692b39aac92130478a595f855f5c78bc41f15f818873</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ijfatigue.2020.105537$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,777,781,3537,27905,27906,45976</link.rule.ids></links><search><creatorcontrib>Sunder, R.</creatorcontrib><title>Cycle sequence sensitivity of near threshold fatigue under programmed loading – A fractographic study</title><title>International journal of fatigue</title><description>[Display omitted]
•Crack growth rates as low as 10−8 mm/cycle can be marked by suitable design of experiment.•Fractographic evidence confirms cycle-sequence sensitivity of near-threshold crack growth.•Reversal of peak-valley sequence of preceding larger cycle dramatically affects fatigue threshold.•Cycle-sequence sensitivity demands modeling for crack growth under long duration load spectra.
Statistically representative programmed block renditions of a transport aircraft wing load spectrum were used to study cycle sequence effects on near-threshold fatigue crack growth rate. Less frequent higher load cycles served as markers that permitted unambiguous estimation of crack growth rate under individual load levels in the load spectrum. Small cycle crack growth rates down to threshold levels are extremely sensitive to the peak-valley sequence of preceding large load cycle, suggesting the need to model the effect of near-tip residual stress on threshold stress intensity in handling load spectra with a large statistical content of smaller load cycles.</description><subject>Crack propagation</subject><subject>Fatigue failure</subject><subject>Fractography</subject><subject>Fracture mechanics</subject><subject>Load interaction effects</subject><subject>Marker bands</subject><subject>Materials fatigue</subject><subject>Residual stress</subject><subject>Spectrum load crack growth</subject><subject>Threshold stress</subject><subject>Threshold stress intensity</subject><subject>Transport aircraft</subject><subject>Wings (aircraft)</subject><issn>0142-1123</issn><issn>1879-3452</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkMlOwzAQhi0EEqXwDFjinOK1jo9VxSYhcYGz5XpJHaVJsZ1KufEOvCFPQqJWXDnN_s_MB8AtRguM8PK-XoTa6xyq3i0IIlOWcyrOwAyXQhaUcXIOZggzUmBM6CW4SqlGCEkk-AxU68E0Dib32bvWTE6bQg6HkAfYedg6HWHeRpe2XWPhaQ_sW-si3Meuinq3cxY2nbahreDP1zdcQR-1yVNtvw0Gptzb4RpceN0kd3Oyc_Dx-PC-fi5e355e1qvXwlBGc2E80bo02pZLbpl2RHJGl5JsqNTaSIIpYqLUXHJfcu65EeXGMOzxGOOyFHQO7o6643HjSymruutjO65UhDFKhRQSj13i2GVil1J0Xu1j2Ok4KIzURFXV6o-qmqiqI9VxcnWcdOMTh-CiSiZM5GyIzmRlu_Cvxi8E34a3</recordid><startdate>202006</startdate><enddate>202006</enddate><creator>Sunder, R.</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>202006</creationdate><title>Cycle sequence sensitivity of near threshold fatigue under programmed loading – A fractographic study</title><author>Sunder, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c343t-cf2aa8cad865d4ae29543692b39aac92130478a595f855f5c78bc41f15f818873</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Crack propagation</topic><topic>Fatigue failure</topic><topic>Fractography</topic><topic>Fracture mechanics</topic><topic>Load interaction effects</topic><topic>Marker bands</topic><topic>Materials fatigue</topic><topic>Residual stress</topic><topic>Spectrum load crack growth</topic><topic>Threshold stress</topic><topic>Threshold stress intensity</topic><topic>Transport aircraft</topic><topic>Wings (aircraft)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sunder, R.</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>International journal of fatigue</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sunder, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cycle sequence sensitivity of near threshold fatigue under programmed loading – A fractographic study</atitle><jtitle>International journal of fatigue</jtitle><date>2020-06</date><risdate>2020</risdate><volume>135</volume><spage>105537</spage><epage>11</epage><pages>105537-11</pages><artnum>105537</artnum><issn>0142-1123</issn><eissn>1879-3452</eissn><abstract>[Display omitted]
•Crack growth rates as low as 10−8 mm/cycle can be marked by suitable design of experiment.•Fractographic evidence confirms cycle-sequence sensitivity of near-threshold crack growth.•Reversal of peak-valley sequence of preceding larger cycle dramatically affects fatigue threshold.•Cycle-sequence sensitivity demands modeling for crack growth under long duration load spectra.
Statistically representative programmed block renditions of a transport aircraft wing load spectrum were used to study cycle sequence effects on near-threshold fatigue crack growth rate. Less frequent higher load cycles served as markers that permitted unambiguous estimation of crack growth rate under individual load levels in the load spectrum. Small cycle crack growth rates down to threshold levels are extremely sensitive to the peak-valley sequence of preceding large load cycle, suggesting the need to model the effect of near-tip residual stress on threshold stress intensity in handling load spectra with a large statistical content of smaller load cycles.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.ijfatigue.2020.105537</doi><tpages>11</tpages></addata></record> |
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| ispartof | International journal of fatigue, 2020-06, Vol.135, p.105537-11, Article 105537 |
| issn | 0142-1123 1879-3452 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Crack propagation Fatigue failure Fractography Fracture mechanics Load interaction effects Marker bands Materials fatigue Residual stress Spectrum load crack growth Threshold stress Threshold stress intensity Transport aircraft Wings (aircraft) |
| title | Cycle sequence sensitivity of near threshold fatigue under programmed loading – A fractographic study |
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