Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude

doi:10.1016/j.engfailanal.2019.04.043

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	Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude
	Pan SN(潘斯宁); Chen R(陈茹)
通讯作者	Pan, Sining(supereve122@163.com)
发表期刊	ENGINEERING FAILURE ANALYSIS
	2019-08-01
卷号	102 页码:284-292
ISSN	1350-6307
摘要	With the development of engine and environmental protection, thermal cracking has become one of the main failure modes of components and materials working under complex thermal conditions. The fatigue microcrack and evolution prediction model of compacted graphite iron under thermal fatigue with variable amplitude is studied in this paper, which is induced by pulsed laser. According to the different length, microcracks shorter than 0.1 mm and longer than 0.3 mm are defined as "secondary microcrack" and "main microcrack", respectively. Results show that, the secondary microcrack caused by the superimposed high-cycle thermal loading shows different behavior of initiation and propagation with the main microcrack. The propagation of secondary microcrack usually limits in a eutectic cell, because that the energy provided in the high-cycle stage is not enough to break across the eutectic boundary. However, the main microcrack can propagate across the eutectic boundary because of enough energy provided in the low-cycle stage. With consideration of both plastic strain energy density and elastic strain energy density, a modified Paris-type model is proposed based on fractal theory. The threshold Delta W-th is introduced to evaluate the damage contribution of elastic strain energy density. The proposed model is helpful for lifetime prediction of components and materials working under thermal fatigue with variable amplitude.
关键词	Crack Thermal fatigue Variable amplitude Evolution prediction Compacted graphite iron
DOI	10.1016/j.engfailanal.2019.04.043
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000467804800024
关键词[WOS]	THERMOMECHANICAL FATIGUE ; LASER ; PROPERTY ; DAMAGE
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Mechanical ; Materials Science, Characterization & Testing
资助项目	Doctor's Scientific Research Foundation of Hezhou University[HZUBS201806] ; Hezhou Foundation Research and Development of Science and Technology[201707007] ; Hezhou Foundation Research and Development of Science and Technology[201808011] ; Teaching Reform Project for Higher Education Undergraduate Course of Guangxi Education Department[2015JGA360]
项目资助者	Doctor's Scientific Research Foundation of Hezhou University ; Hezhou Foundation Research and Development of Science and Technology ; Teaching Reform Project for Higher Education Undergraduate Course of Guangxi Education Department
论文分区	二类
力学所作者排名	1
RpAuthor	Pan, Sining
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/80693
专题	先进制造工艺力学实验室
推荐引用方式 GB/T 7714	Pan SN,Chen R. Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude[J]. ENGINEERING FAILURE ANALYSIS,2019,102:284-292.
APA	潘斯宁,&陈茹.(2019).Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude.ENGINEERING FAILURE ANALYSIS,102,284-292.
MLA	潘斯宁,et al."Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude".ENGINEERING FAILURE ANALYSIS 102(2019):284-292.

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