Effect of Thinckness on Residual Stress Fields of Cold Expansion Hole

Abstract:

In this paper, four axisymmetrical finite element models have been established to study effect of thinckness on residual stress fields of cold expansion hole, experiments were carried out to measure the residual stress of cold expansion hole and verify simulation results. The experiment results also show that cold expansion processing can decrease surface roughness of holes and improve surface quality. The FEM results show, at the top(bottom) surface, the volue of the radial residual stress varies with the plate’s thickness, and the regularities of distribution of the radial residual stress are identical. The volue and the regularities of distribution of the circumferential residual stress vary with the plate’s thickness. At the mid-thickness surface, the volue and the regularities of distribution of radial residual stress vary with the plate’s thickness. The volue of the circumferential residual stress varies with the plate’s thickness, and the regularities of distribution of the radial residual stress are identical.

• Periodical: Advanced Materials Research (Volumes 97-101)
• Pages: 601-604
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.97-101.601
• Online since: March 2010
• Authors: Yong Shou Liu, Bing Wang Gou, X.J. Shao, Zhi Feng Jiang, Z.F. Yue
• Keywords: Cold Expansion, Residual Stress, Surface Roughness (SR), Thickness

References

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[8] J. Liu, X.J. Shao, Y.S. Liu, etc., Mater. Sci. & Eng. A , 477 (2008), p.271. 2% 4% 6% Specimen Diameter Roughness Specimen Diameter Roughness Specimen Diameter Roughness 1A 0. 03.

025Φ 6. 3 1B 0. 05.

015Φ 3. 2 1C 0. 05.

015Φ 3. 2 2A 0. 05.

0055Φ 6. 3 2B 0. 04.

015Φ 3. 2 2C 0. 05.

015Φ 3. 2 3A 0. 04.

015+ −Φ 6. 3 3B 0. 03.

015Φ 3. 2 3C 0. 05.

015Φ 3. 2 4A 0. 02.

015Φ 3. 2 4B 0. 04.

025Φ 3. 2 4C 0. 05.

015Φ 3. 2 5A 0. 03.

015Φ 3. 2 5B 0. 04.

025Φ 3. 2 5C 0. 05.

015Φ 3. 2 6A 0. 03.

015Φ 3. 2 6B 0. 06.

015Φ 3. 2 6C 0. 05.

015Φ 3. 2 7A 0. 06.

025Φ 3. 2 7B 0. 05.

045Φ 3. 2 7C 0. 05.

015Φ 3. 2 Tab. 1 Surface roughness and diameters of cold expansion hole.