发明名称 |
METHOD FOR ASSESSING REMAINING LIFESPAN OF BOLT USED AT HIGH TEMPERATURES |
摘要 |
The present invention is intended to provide a method for assessing remaining lifespan of a bolt with higher precision than conventional methods, which can be applied to a bolt comprising a high alloy with fewer tissue changes caused by creep damage. The present invention provides a method for assessing the remaining lifespan of a bolt used at high temperatures, including: carrying out a creep test for a bolt material that constitutes a bolt to be assessed and determining a life-time and a life-elongation rate; determining a time-temperature parameter based on the life-time and the creep test temperature; creating a lifespan-assessment diagram by plotting the time-temperature parameter with respect to the life-elongation rate; measuring a elongation rate between before and after the use of the bolt to be assessed; and assessing the remaining lifespan of the bolt with the use of the elongation rate between before and after the use of the bolt to be assessed and the lifespan-assessment diagram.
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申请公布号 |
CA2693045(A1) |
申请公布日期 |
2010.09.19 |
申请号 |
CA20102693045 |
申请日期 |
2010.02.10 |
申请人 |
HITACHI, LTD. |
发明人 |
ARAI, MASAHIKO;KOBAYAHSI, SHINICHI;DOI, HIROYUKI;CHIBA, HIROAKI;HANEISHI, TAKASHI |
分类号 |
G01N3/18 |
主分类号 |
G01N3/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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