New approach to determine uniaxial creep properties from small punch creep curves

被引：4
|
作者：
Dymacek, Petr [1 ,2 ]
Li, Yingzhi [3 ]
Dobes, Ferdinand [1 ]
Stevens, Paul [4 ]
机构：
[1] Acad Sci Czech Republ, Inst Phys Mat, Zizkova 22, Brno 61662, Czech Republic
[2] Acad Sci Czech Republ, Inst Phys Mat, CEITEC IPM, Brno, Czech Republic
[3] Mat & Inspect Dept, Utrecht, Netherlands
[4] DEKRA, Mat Testing & Inspect, Utrecht, Netherlands
来源：
MATERIALS AT HIGH TEMPERATURES | 2019年 / 36卷 / 02期
关键词：
Small punch; uniaxial creep; equivalent stress; heat resistant steels; CR FERRITIC STEEL; DEFORMATION; DEFLECTION; BEHAVIOR; STRAIN; LIFE;
D O I：
10.1080/09603409.2018.1495876
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A key issue in the small punch creep test (SPC) is to determine the equivalent stress that results in the same time to rupture in a uniaxial creep test (UAC). A new approach is proposed based on formulas between the ratio of force in SPC to stress in UAC and the deflection at the minimum deflection rate. Another formula is defined between the minimum deflection rate and the minimum strain rate. In both cases, they were created from a large experimental data pool of high temperature creep-resistant steels. The predicted Norton law and the rupture time dependence on stress are in good agreement with the experimental UAC results. In all cases, the predictions using the present approach are much better than those based on Chakrabarty membrane stretch model.
引用
收藏
页码：157 / 164
页数：8
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