Mechanism of effects of warm prestressing (WPS) on apparent toughness of notched steel specimens Part II: Calculations and analyses

doi:10.1023/A:1022251128300

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	Mechanism of effects of warm prestressing (WPS) on apparent toughness of notched steel specimens Part II: Calculations and analyses
	Chen, JH ; Wang, HJ ; Wang, GZ ; Dong, ZQ ; Chen, X
刊名	INTERNATIONAL JOURNAL OF FRACTURE
	2002-10
卷号	117 期号:4 页码:375-392
关键词	warm prestressing fracture toughness notched specimen HSLA steel prestrain-deactivating
ISSN号	0376-9429
DOI	10.1023/A:1022251128300
英文摘要	Based on the experimental results of Part I of present work, this paper describes results of FEM calculations and analyses in details which identified that the effect of tensile-warm pre-stressing (WPS) on improvement of the apparent toughness of notched specimens results from three factors i.e. the residual compressive stress, macroscopic blunting of the original notch, and prestrain-deactivating cleavage initiation. The effects of three factors are separated and is effective for each at various extents of prestressing specified with a prestress-ratio, P-0/P-gy, defining the prestressing load P-0 as a fraction of general yield load P-gy. For values of prestress-ratio lower than 1.0, the residual compressive stress acts as the main factor. Between 1.0 to 1.5 of prestress-ratio values, in addition to the residual compressive stress the macroscopic blunting plays increasing role. The effect of the prestrain-deactivating cleavage initiation presents at the prestress-ratio P-0/P-gy greater than or equal to 1.2. In the case of compressive-warm prestressing, the apparent toughness is deteriorated due to the residual tensile stress. The effects of complex cycles of WPS, with various steps of loading and unloading different in signs, are determined mainly by the loading step just before the fracturing step.
WOS研究方向	Materials Science ; Mechanics
语种	英语
出版者	KLUWER ACADEMIC PUBL
WOS记录号	WOS:000181424200007
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/35905]
专题	兰州理工大学
通讯作者	Chen, JH
作者单位	1.Gansu Univ Technol, Lanzhou Gansu 730050, Peoples R China 2.Wuhan Iron & Steel CO, Wuhan 430080, Peoples R China
推荐引用方式 GB/T 7714	Chen, JH,Wang, HJ,Wang, GZ,et al. Mechanism of effects of warm prestressing (WPS) on apparent toughness of notched steel specimens Part II: Calculations and analyses[J]. INTERNATIONAL JOURNAL OF FRACTURE,2002,117(4):375-392.
APA	Chen, JH,Wang, HJ,Wang, GZ,Dong, ZQ,&Chen, X.(2002).Mechanism of effects of warm prestressing (WPS) on apparent toughness of notched steel specimens Part II: Calculations and analyses.INTERNATIONAL JOURNAL OF FRACTURE,117(4),375-392.
MLA	Chen, JH,et al."Mechanism of effects of warm prestressing (WPS) on apparent toughness of notched steel specimens Part II: Calculations and analyses".INTERNATIONAL JOURNAL OF FRACTURE 117.4(2002):375-392.