Out-of-Plane Constraint Effect on the Fracture Toughness of Single Edge Notch Tension Specimens

doi:10.11900/0412.1961.2018.00122

Acta Metall Sin

2018, Vol. 54

Issue (12): 1785-1791 DOI: 10.11900/0412.1961.2018.00122

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Out-of-Plane Constraint Effect on the Fracture Toughness of Single Edge Notch Tension Specimens

Yizhe LI, Baoming GONG(

), Xiuguo LIU, Dongpo WANG, Caiyan DENG

Tianjin Key Laboratory of Advanced Joining Technology, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China

Cite this article:

Yizhe LI, Baoming GONG, Xiuguo LIU, Dongpo WANG, Caiyan DENG. Out-of-Plane Constraint Effect on the Fracture Toughness of Single Edge Notch Tension Specimens. Acta Metall Sin, 2018, 54(12): 1785-1791.

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Abstract

The crack-tip stress and strain fields of single edge notch tension (SENT) specimen are similar to those of the full-scale pipe containing surface cracks under longitudinal tension and/or internal pressure. It is well known that material's fracture toughness is not constant, and the specimen size has a significant influence on fracture toughness. It is thus essential to consider the transferability from fracture specimens in laboratory testing to practical structures, i.e., size effects or constraint effects. However, the specimen dimensions for SENT specimens recommended by current design procedures have not validated the out-of-plane constraint effect on the fracture toughness. In this work, the effect of specimen thickness on the crack tip opening displacement (CTOD) of SENT specimen was investigated using an API X90 grade steel. Full-field deformation measurement by digital image correlation (DIC) technique and stretching zone width (SZW) examination were performed to analyze the size effects on fracture toughness. The results show that the critical crack initiation toughness is highly sensitive to specimen thickness, and decreases significantly as specimen thickness increases until the thickness-to-width ratio (B/W) equals to 4, beyond which the effect of specimen thickness becomes relatively weak. As the specimen thickness increases, the maximum longitudinal strain and stretching zone width decrease sharply, and the location of high-strain zones changes significantly; when B/W≥3, strain is initiated from the area opposite the cracked side rather than from the crack tip, indicating a strong loss of plasticity for thicker specimens. A dimension size is recommended for the fracture toughness testing to take the out-of-plane constraint into account for SENT specimen.

Key words: fracture toughness out-of-plane constraint effect single edge notch tension integrity assessment

Received: 02 April 2018

ZTFLH:

TG407

Fund: Supported by National Natural Science Foundation of China (No.51305295) and National Key Research and Development Program of China (No.2016YFC0802105)

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	Yizhe LI
	Baoming GONG
	Xiuguo LIU
	Dongpo WANG
	Caiyan DENG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00122 OR https://www.ams.org.cn/EN/Y2018/V54/I12/1785

Fig.1 The true stress-strain curve of X90 steel

Fig.2 The six size-scale clamped SENT specimens with side-groove

Table 1 Dimensions for single edge notch tension (SENT) specimens of X90 steel

Fig.3 P-V curves of SENT specimens (The solid line and the dash line correspond to the lower and higher gauges, respectively. P—applied load, V—crack mouth opening displacement)

Fig.4 δ-Δa curves of SENT specimens with various thicknesses (δ—crack tip opening displacement, Δa—ductile crack extension)

Fig.5 The thickness effect of SENT specimens on the critical crack tip opening displacement (δ_C) determined by the double-clip gauge method

Fig.6 Longitudinal strains in SENT specimens with various thicknesses
(a) B/W=0.5 (b) B/W=1 (c) B/W=2 (d) B/W=3 (e) B/W=4 (f) B/W=6

Fig.7 The measured stretching zone width (W_SZW) of SENT specimens with various thicknesses
(a) B/W=0.5 (b) B/W=1 (c) B/W=2 (d) B/W=3 (e) B/W=4 (f) B/W=6

Fig.8 The effect of B/W on the θ_SZW for SENT specimens (θ_SZW—blunting angle related to the stretching zone width)

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