On Fracture Mechanics Testing Technique Based on Compliance of Specimens

Abstract:

Based on compliance testing of a straight-notch compact tensile (SN-CT) or a single edge bending (SEB) specimen, this paper present a formula with increment form to calculate plastic part of J-integral, two formulas for a SN-CT specimen and a SEB specimen to transform crack mouth opening displacement (CMOD) v0 to the crack opening displacement (COD) q along load line, and simplified formulas to estimate crack length a and effective young’s modulus E. Furthermore, the relation between v and q of the SN-CT specimens of 45 steel and SEB specimens of 30Cr steel were investigated. The results show that the formulas to describe the relation between the ratio v/q and the dimensionless crack length a/w of the specimens accord with the testing results better.

• Periodical: Key Engineering Materials (Volumes 385-387)
• Pages: 293-296
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.385-387.293
• Online since: July 2008
• Authors: Li Xun Cai, Lei Jin, Chen Bao
• Keywords: CAMT, Chemical Oxygen Demand (COD), Compliance, Crack Growth Rate, Fracture Toughness, Testing Techniques

References

[1] GB2038-91: Standard test method for JIC, a measure of ductile fracture toughness. Chinese standard bureau. (1991).

[2] ASTM E813-89: Standard of test method for JIC, a measure of fracture toughness, America Society of Testing and Materials. (1989).

[3] ASTM E399-90: Standard of test method for plain strain fracture toughness of metallic materials, America Society of Testing and Materials. (1990).

[4] ISO 12135-2002(E): International standard of unified method of test for the determination of quasistatic fracture toughness, International Organization for Standardization. (2002) Figure 4 a/w~Ux curves for CT and the errors 0.

2.

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8 1.

[1] 2 0 0. 05 0. 1 0. 15 0. 2 Ux a/w 0.

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8 1 Error /% a/w form ASTM E813-89 a/w from GB6398－2000 a/w from Eq. 8 Error of national formula Error of Eq. 8.