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

doi:10.1016/j.engfailanal.2019.04.043

CORC > 力学研究所 > 中国科学院力学研究所 > 先进制造工艺力学重点实验室

	Fatigue crack and evolution prediction of compacted graphite iron under thermal loading with variable amplitude
	Pan SN(潘斯宁); Chen R(陈茹)
刊名	ENGINEERING FAILURE ANALYSIS
	2019-08-01
卷号	102 页码:284-292
关键词	Crack Thermal fatigue Variable amplitude Evolution prediction Compacted graphite iron
ISSN号	1350-6307
DOI	10.1016/j.engfailanal.2019.04.043
通讯作者	Pan, Sining(supereve122@163.com)
英文摘要	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.
分类号	二类
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]
WOS关键词	THERMOMECHANICAL FATIGUE ; LASER ; PROPERTY ; DAMAGE
WOS研究方向	Engineering ; Materials Science
语种	英语
WOS记录号	WOS:000467804800024
资助机构	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
其他责任者	Pan, Sining
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/80693]
专题	力学研究所_先进制造工艺力学重点实验室
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.