Study on Stress Distribution Near Crack Tip in Beryllium Compact Tension Specimen

Abstract:

In order to evaluate the fracture characteristic near the crack tip of beryllium specimen, beryllium compact tension specimen with plane strain state is designed. The stress distribution near the crack tip is measured at different loading level by X3000 stress analyzer. Moreover, a finite element model for calculated the stress and strain fields in beryllium compact tension specimen has also been set up. As a result, the stress and strain distribution near the crack tip at different loading has been calculated by this model. According to the critical tension loading of beryllium specimen, the maximum plastic strain and the radius of the plastic zone near the crack tip are determined, where the maximum plastic strain near the crack tip is about 0.018 and the maximum radius of plastic zone is about 0.3mm. Altogether, the fracture toughness of beryllium is obtained, which is about 19.1MPam1/2.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 2487-2490
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.2487
• Online since: June 2010
• Authors: Ping Dong, Rui Wen Li, Sheng He Li
• Keywords: Beryllium, Crack Tip, Finite Element Model (FEM), X-Ray Stress Measurement

References

[1] Ravi V, Mark AM, Michael DG. LA-UR-97-1140, (1997).

[2] Zhang Pengcheng. Mineral & Metallurgy, 2001, 10(1): 59~62.

[3] Zhang Pengcheng. Nonferrous metal, 2001, 53(1): 60~63.

[4] Dong Ping, Chen YZ, Zou JS. Acta metallurgica sinica, 2002, 38 (8): 881-884.

[5] Dong Ping, Chen YZ, Zou JS. Rare metal materials and engineering, 2004, 33(6): 585-588.

[6] Dong Ping, Chen YZ, Bai CM. Rare metal materials and engineering, 2004, 33 (4): 445-448.