The Experimental Research Based on SHPB Test of the Rocks Plastic Damage Cumulative Effect

Abstract:

This article to research through SHPB test of the rocks in the plastic damage under the cumulative effects. This paper selects bullets for the diameter steel rods, the bullet hit by a fixed speed when fixed, selects the two kinds of circumstances for gas chamber pressure such as P = 0.6 MPa and P = 0.7 MPa. It is concluded that the main important conclusions： Test specimen didn’t reach the effect for ,Limestone which is no initial damage to absorb lesser energy, as the same time the internal stones damage were also lower, and with the impact times accumulation, limestone damages degree were increasing, eventually make the specimen destroy. The internal of rock specimens are low destroy, when has the same effect, specimens receiving the maximum stress by lesser,when the internal damage can cumulative increases to certain value, and is suffered the same stress effect, finally the maximum stress will be decreased. For rocks material at repeated impact as low speed ,under this action show the obvious plastic damage accumulation effect

• Periodical: Advanced Materials Research (Volumes 347-353)
• Pages: 1523-1529
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.347-353.1523
• Online since: October 2011
• Authors: Yi Yang, Lei Liu, Xiang Long Li, Di Liu
• Keywords: Cumulative Effect, Limestone, Plastic Damage, SHPB

References

[1] Kolsky H.An Investigation of the Mechanical Properties of Materials at Very High Rates of Loading[J]. Proceedings of the Physical Society of London, 1949, B62: 676-700.

DOI: 10.1088/0370-1301/62/11/302

[2] Li Xiang long,Liu Dian shu. Confining pressure of concrete steel sleeve passive dynamic mechanical properties of the material impact[J]. Explosion and Shock，2009,29（5）：463-467

[3] Feng Ming de, Passive confining pressure, dynamic properties of concrete materials[D] China University of Mining（Bei Jing），(2006)

[4] Dong Xing，Rocks under different stress wave parameters and failure tests on the material damage[D] China University of Mining（Bei Jing），(2009)

[5] Zhang Xiaochun, Yang Tingqing,Miu Xiexing. Evolution of rock fracture and mechanical properties of the progress [J]. Mechanics, 1999,29(1):97-104.

[6] Grady D E. The mechanics of fracture under high-rate stress loading[A]. Bazant Z. Mechanics of Geomaterials[C]. 1985:129-155.

[7] Xu Ji shan. Strength theory and its applications. BeiJing：Water Conservancy and Electric Power Press, 1981.