Atomistic scale behaviors of intergranular crack propagation along twist grain boundary in iron under dynamic loading

doi:10.1016/j.engfracmech.2022.108731

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Atomistic scale behaviors of intergranular crack propagation along twist grain boundary in iron under dynamic loading
	Zhao ZF(赵志福)1,3,4; Safaei, Babak 2; Wang, Yanfei 3; Liu, Yanwei 3; Chu, Fulei 1; Wei, Yueguang 3
刊名	ENGINEERING FRACTURE MECHANICS
	2022-10-01
卷号	273 页码:16
关键词	Dynamic load Molecular dynamics Intergranular crack propagation Stacking fault Dislocation
ISSN号	0013-7944
DOI	10.1016/j.engfracmech.2022.108731
通讯作者	Zhao, Zhifu(zhaozhifu@imech.ac.cn)
英文摘要	Due to alternative exchange between single and double-teeth meshings, the upper part of gear tooth is subjected to dynamic tensile stress whose growth rate presents rectangular fluctuation. This work investigates the atomistic scale behaviors of intergranular crack propagation along twist grain boundary in body-centered cubic (bcc) iron under dynamic tensile stress. The effects of driving force and contact ratio are fully discussed. Results show that only stacking faults with face-centered cubic (fcc) atoms can be formed in lower monocrystal portion. Edge dislocations in upper monocrystal portion are suppressed by intergranular crack cleavage. Critical stresses for stacking fault nucleation and intergranular crack cleavage vary with driving force and contact ratio. By calculating actual stress intensity factor at crack tip, variations of critical stresses are found to be attributed to the variations of time-dependent factors. Although critical stresses vary with driving force and contact ratio, the effects of these factors on the growths of crack length and plastic zone are not obvious in the early stage of intergranular crack propagation. Accumulated plastic strain energy before intergranular crack cleavage is independent of driving force and contact ratio. Departing from the early stage, the growth rates of crack length and plastic zone increase significantly with an increase in driving force or a decrease in contact ratio. However, the final ductile level of intergranular crack propagation cannot vary with contact ratio and large driving force. By applying dynamic load, this work can be used to reveal the atomistic scale mechanism of gear failure. The results can provide a good reference for gear safety design.
分类号	二类/Q1
资助项目	National Postdoctoral Program for Innovative Talents[BX20200007] ; China Postdoctoral Science Foundation[2020M670035] ; National Natural Science Foundation of China[51335006] ; National Natural Science Foundation of China[11890681] ; National Natural Science Foundation of China[12032001] ; High-performance Computing Platform of Peking University
WOS关键词	MOLECULAR-DYNAMICS ; BCC IRON ; CRYSTAL ORIENTATION ; SIMULATION ; FRACTURE ; GROWTH ; TIP ; DEFORMATION
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:000848143900003
资助机构	National Postdoctoral Program for Innovative Talents ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; High-performance Computing Platform of Peking University
其他责任者	Zhao, Zhifu
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/89979]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China; 2.Eastern Mediterranean Univ, Dept Mech Engn, North Cyprus via Mersin 10, Famagusta, Turkey 3.Peking Univ, Coll Engn, Dept Mech & Engn Sci, Beijing 100871, Peoples R China; 4.Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Zhao ZF,Safaei, Babak,Wang, Yanfei,et al. Atomistic scale behaviors of intergranular crack propagation along twist grain boundary in iron under dynamic loading[J]. ENGINEERING FRACTURE MECHANICS,2022,273:16.
APA	赵志福,Safaei, Babak,Wang, Yanfei,Liu, Yanwei,Chu, Fulei,&Wei, Yueguang.(2022).Atomistic scale behaviors of intergranular crack propagation along twist grain boundary in iron under dynamic loading.ENGINEERING FRACTURE MECHANICS,273,16.
MLA	赵志福,et al."Atomistic scale behaviors of intergranular crack propagation along twist grain boundary in iron under dynamic loading".ENGINEERING FRACTURE MECHANICS 273(2022):16.