Research Papers: Materials and Fabrication

Deformation Versus Modified J-Integral Resistance Curves for Ductile Materials

[+] Author and Article Information
Xian-Kui Zhu

1250 Arthur E. Adams,
Columbus, OH 43221
e-mail: xzhu@ewi.org

Poh-Sang Lam

Materials Science and Technology,
Savannah River National Laboratory,
Aiken, SC 29808
e-mail: ps.lam@srnl.doe.gov

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received November 3, 2014; final manuscript received May 5, 2015; published online June 16, 2015. Assoc. Editor: Kunio Hasegawa.

J. Pressure Vessel Technol 137(5), 051407 (Oct 01, 2015) (8 pages) Paper No: PVT-14-1179; doi: 10.1115/1.4030593 History: Received November 03, 2014; Revised May 05, 2015; Online June 16, 2015

The J-integral resistance curve (or J-R curve) is an important fracture property of materials and has gained broad applications in assessing the fracture behavior of structural components. Because the J-integral concept was proposed based on the deformation theory of plasticity, the J-R curve is a deformation-based result. It has been known that the J-R curves of a material depend on specimen size and geometry; therefore, a modified J-integral or Jm was proposed to minimize the size dependence. Extensive experiments have shown that the Jm-R curves might remain size-dependent and could not behave better than the traditional deformation J-R curves. To date, however, it is noticed that the Jm-R curves were still used as “size-independent” results in some fracture mechanics analyses. It is necessary to revisit this topic for further clarification. This paper presents a brief review on the development of deformation and modified J-integral testing, and obtains a simple incremental Jm-integral equation. It is followed by typical experimental results with discussions on the issues of constraint or size dependence of J-R and Jm-R curves for different steels and specimens. Finally, a recommendation is made on properly selecting a resistance curve in the fracture analysis.

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Grahic Jump Location
Fig. 1

Comparison of experimental and numerical results of resistance curves (this figure is taken from Ref. [39])

Grahic Jump Location
Fig. 2

Resistance curves for 3-Ni steel CT tests: (a) deformation J-R curve and (b) modified Jm-R curve (these figures are taken from Ref. [18])

Grahic Jump Location
Fig. 3

Resistance curves for A533B-02 steel CT tests: (a) deformation J-R curve and (b) modified Jm-R curve (these figures are taken from Ref. [18])

Grahic Jump Location
Fig. 4

Resistance curves for 304 stainless steel weld CT tests: (a) deformation J-R curve and (b) modified Jm-R curve (these figures are taken from Ref. [20])

Grahic Jump Location
Fig. 5

Resistance curves for HY100 steel SENB tests: (a) deformation J-R curve and (b) modified Jm-R curve (these figures are taken from Ref. [21])

Grahic Jump Location
Fig. 6

Crack length dependence of: (a) deformation J-R curves and (b) modified Jm-R curves for A285 carbon steel using SENB and CT specimens




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