Low-cycle fatigue of IN 718: Effect of waveform

被引：9

作者：

Barat, Kaustav ^{[1
]}

Sivaprasad, S. ^{[2
]}

Kar, Sujoy Kumar ^{[3
]}

Tarafder, Soumitra ^{[2
]}

机构：

[1] CSIR Natl Aerosp Labs, Mat Sci Div, Bangalore, Karnataka, India

[2] CSIR Natl Met Labs, Mat Testing & Evaluat Grp, Jamshedpur, Bihar, India

[3] Indian Inst Technol, Dept Met & Mat Engn, Kharagpur, W Bengal, India

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2019年 / 42卷 / 12期

关键词：

creep-fatigue damage parameter; mean stress relaxation; nonpeak hold; superalloys; time-dependent fatigue; TYPE-347 WELD METAL; LIFE PREDICTION; CREEP-FATIGUE; HIGH-TEMPERATURE; DAMAGE; BEHAVIOR; MODEL; GROWTH; COPPER; STEEL;

D O I：

10.1111/ffe.13127

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The influence of various strain waveforms on the low-cycle fatigue of IN 718 tested at 650 degrees C has been investigated. The straining paths are accompanied by dwell-induced creep component(s) or unequal strain distribution in different portions of cycles reducing strength of material. The investigation intends to clarify mainly mechanistic aspects of relaxation-fatigue interaction. Features of time-dependent effect induced by nonpeak dwell and the same accompanied by peak dwell, slow unloading from the peak to a lower strain, and different loading and unloading rates are compared in terms of stress amplitude responses, mean stress relaxation, hysteresis loops, life, and damage parameter DC-F. Softening is common in all the cases, and degree of softening varies linearly with life. The energy-based life prediction model has been found to work well for the data, and we have introduced energy fraction-based approach to observe simultaneous contribution from both creep and fatigue on life.

引用

页码：2823 / 2843

页数：21

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