Life assessment in constant and variable amplitude high‐temperature fatigue of ductile cast iron and metastable austenitic steel based on in situ measurement of physical properties
Life assessment in constant and variable amplitude high‐temperature fatigue of ductile cast iron and metastable austenitic steel based on in situ measurement of physical properties
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基于物理性能原位测量的球墨铸铁和亚稳奥氏体钢恒幅和变幅高温疲劳寿命评估
DOI：
10.1002/mawe.201700204
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发表时间：
2018
影响因子：
1.1
通讯作者：
T. Beck
中科院分区：
文献类型：
--
作者：
M. Klein;B. Jost;M. Smaga;A. Sorich;D. Eifler;T. Beck
作为表征随温度和载荷变化的疲劳行为的有效方法，本文介绍了：(1)应变增长和温升试验用于综合定量表征动态应变时效对铸铁疲劳性能的影响；(2)电磁声换能器信号分析用于早期检测AISI 347亚稳奥氏体不锈钢的疲劳损伤。对于铸铁，在升温试验中记录的塑性应变和应力幅值可以在高达92 Hz的频率下识别动态应变时效的开始和峰值。等温应变增长试验以及在高周/低周疲劳状态下循环变形行为与Wöhler曲线斜率之间Morrow关系的应用，使得确定总应变Wöhler曲线与常规恒幅实验非常一致。AISI347疲劳过程的现场表征是通过电磁换能器测量超声信号的飞行时间和幅度衰减来实现的，电磁声换能器不使用偶联剂而直接在导电材料中产生超声波。特别是飞行时间信号反映了实际的试件载荷以及循环硬化/软化和早期疲劳损伤，具有极高的灵敏度。
As effective methods for characterization of temperature and load dependent fatigue behavior, the present paper describes (i) application of strain increase and temperature increase tests for comprehensive quantitative characterization of the dynamic strain aging influence on fatigue properties of cast iron and (ii) analysis of electromagnetic acoustic transducer signals for early detection of fatigue damage of AISI 347 metastable austenitic stainless steel. In case of cast iron, plastic strain and stress amplitude recorded in temperature increase tests allow identification of the onset and peak of dynamic strain aging at frequencies up to 92 Hz. Isothermal strain increase tests and application of Morrow's relationships between cyclic deformation behavior and slopes of a Wöhler curve in the high cycle / low cycle fatigue‐regime allow determining the total strain Wöhler curve in excellent agreement with conventional constant amplitude experiments. In‐situ characterization of fatigue processes in AISI 347 was performed by measurement of ultrasonic signal time‐of‐flight as well as amplitude decay by electromagnetic acoustic transducers which generate ultrasonic waves directly in electrically conductive materials without the use of a couplant. Especially the time‐of‐flight signal reflects the actual specimen loading as well as cyclic hardening / softening and early fatigue damage with excellent sensitivity.
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DOI：
--
发表时间：
1995
期刊：
影响因子：
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DOI：
10.1016/s0921-5093(01)00981-9
发表时间：
2001
影响因子：
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影响因子：
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作者：
Benjamin Jost;Marcus Klein;Tilmann Beck;Dietmar Eifler
通讯作者：
Dietmar Eifler
DOI：
--
发表时间：
2012
期刊：
影响因子：
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