Fatigue failure analysis of a leg press exercise machine
The following paper is an engineering failure analysis of an adjustment pin used in a leg press exercise machine. The pin is used to allow adjustment of the machine for people of different heights. It was modeled as a cantilever beam subjected to varying forces depending on the weight stack setting....
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| Veröffentlicht in: | Engineering failure analysis 1999-02, Vol.6 (1), p.1-12 |
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| container_title | Engineering failure analysis |
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| creator | Vernon, P.J. Mackin, T.J. |
| description | The following paper is an engineering failure analysis of an adjustment pin used in a leg press exercise machine. The pin is used to allow adjustment of the machine for people of different heights. It was modeled as a cantilever beam subjected to varying forces depending on the weight stack setting. The fracture occurred at a point of localized stress concentration. The analysis shows an elastic stress concentration of 1.67 which would cause plastic deformation and a fatigue stress concentration of 1.38 that led to the eventual fatigue failure. Based on actual user data, a block loading analysis was used to calculate a pin lifetime of approximately one year. The pin actually failed after 1 years of use. Design changes are recommended to reduce the size of the stress concentration and subsequently increase the life of the adjustment pin. |
| doi_str_mv | 10.1016/S1350-6307(98)00030-2 |
| format | Article |
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The pin is used to allow adjustment of the machine for people of different heights. It was modeled as a cantilever beam subjected to varying forces depending on the weight stack setting. The fracture occurred at a point of localized stress concentration. The analysis shows an elastic stress concentration of 1.67 which would cause plastic deformation and a fatigue stress concentration of 1.38 that led to the eventual fatigue failure. Based on actual user data, a block loading analysis was used to calculate a pin lifetime of approximately one year. The pin actually failed after 1 years of use. 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The pin is used to allow adjustment of the machine for people of different heights. It was modeled as a cantilever beam subjected to varying forces depending on the weight stack setting. The fracture occurred at a point of localized stress concentration. The analysis shows an elastic stress concentration of 1.67 which would cause plastic deformation and a fatigue stress concentration of 1.38 that led to the eventual fatigue failure. Based on actual user data, a block loading analysis was used to calculate a pin lifetime of approximately one year. The pin actually failed after 1 years of use. Design changes are recommended to reduce the size of the stress concentration and subsequently increase the life of the adjustment pin.</description><subject>Fatigue</subject><subject>Fatigue design</subject><subject>Sports equipment failures</subject><issn>1350-6307</issn><issn>1873-1961</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><recordid>eNqFkD1PwzAURS0EEqXwE5A8IRgC_mgce0KoooBUiQGYLefluRilSbETRP89aQMz07vDuVd6h5Bzzq454-rmhcucZUqy4tLoK8aYZJk4IBOuC5lxo_jhkP-QY3KS0scAFcLwCdEL14VVj9S7UPcRqWtcvU0h0dZTR2tc0U3ElCh-Y4SQkK4dvIcGT8mRd3XCs987JW-L-9f5Y7Z8fnia3y0zEFp1WcGNYZoZWeagYIalZ04jMF5VTkDJcmeU18ZIX5Z8JrzxGgzIUmjPofKlnJKLcXcT288eU2fXIQHWtWuw7ZMVyuRScT2A-QhCbFOK6O0mhrWLW8uZ3Xmye092J8EabfeerBh6t2MPhy--AkabIGADWIWI0NmqDf8s_ADHHW-C</recordid><startdate>19990201</startdate><enddate>19990201</enddate><creator>Vernon, P.J.</creator><creator>Mackin, T.J.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19990201</creationdate><title>Fatigue failure analysis of a leg press exercise machine</title><author>Vernon, P.J. ; Mackin, T.J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c286t-719908093b5c6c4ebf0a8ec01dda2cb05a96f8993fbb142f9f8c9c3b28f1cdfb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1999</creationdate><topic>Fatigue</topic><topic>Fatigue design</topic><topic>Sports equipment failures</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Vernon, P.J.</creatorcontrib><creatorcontrib>Mackin, T.J.</creatorcontrib><collection>CrossRef</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Engineering failure analysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Vernon, P.J.</au><au>Mackin, T.J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fatigue failure analysis of a leg press exercise machine</atitle><jtitle>Engineering failure analysis</jtitle><date>1999-02-01</date><risdate>1999</risdate><volume>6</volume><issue>1</issue><spage>1</spage><epage>12</epage><pages>1-12</pages><issn>1350-6307</issn><eissn>1873-1961</eissn><abstract>The following paper is an engineering failure analysis of an adjustment pin used in a leg press exercise machine. The pin is used to allow adjustment of the machine for people of different heights. It was modeled as a cantilever beam subjected to varying forces depending on the weight stack setting. The fracture occurred at a point of localized stress concentration. The analysis shows an elastic stress concentration of 1.67 which would cause plastic deformation and a fatigue stress concentration of 1.38 that led to the eventual fatigue failure. Based on actual user data, a block loading analysis was used to calculate a pin lifetime of approximately one year. The pin actually failed after 1 years of use. Design changes are recommended to reduce the size of the stress concentration and subsequently increase the life of the adjustment pin.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/S1350-6307(98)00030-2</doi><tpages>12</tpages></addata></record> |
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| identifier | ISSN: 1350-6307 |
| ispartof | Engineering failure analysis, 1999-02, Vol.6 (1), p.1-12 |
| issn | 1350-6307 1873-1961 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_26953618 |
| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Fatigue Fatigue design Sports equipment failures |
| title | Fatigue failure analysis of a leg press exercise machine |
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