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Practical Application of Static Rock Breaker Using TiNi Shape Memory Alloy

Published online by Cambridge University Press:  25 February 2011

M. Nishida ,
K. Kaneko ,
K. Takashima ,
K. Yamauchi  and
T. Inaba
M. Nishida
Affiliation:
Kumamoto University, Dept. of Materials Sci. and Resource Eng. 2-39-1 Kurokami, Kumamoto 860, Japan
K. Kaneko
Affiliation:
Kumamoto University, Dept. of Materials Sci. and Resource Eng. 2-39-1 Kurokami, Kumamoto 860, Japan
K. Takashima
Affiliation:
Kumamoto University, Dept. of Materials Sci. and Resource Eng. 2-39-1 Kurokami, Kumamoto 860, Japan
K. Yamauchi
Affiliation:
Tokin Corporation, 6-7-1 Kohriyama, Taihaku-Ku, Sendai 982, Japan
T. Inaba
Affiliation:
Nishimatsu Construction Co., LTD., 2570-4 Shimotsuruma, Yamato 242, Japan
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Abstract

A newly invented static rock breaker using TiNi shape memory alloy has been proposed. The breaker consisted of compressively pre-strained TiNi rods of 15mm in diameter and 29mm in height and a pair of two-layered wedge type platens of steel, and required no accessory equipments other than heating apparatus. The maximum breaking force per unit length of the breaker was 3 to 5MN/m. The total breaking force was about 300 to 900kN, depending on the number of TiNi rods used. To examine the practicality, the breaker has been applied to concrete wall of building, natural boulder, etc. It was confirmed that the breaker was not lack in terms of performance and was possible to control the direction of crack initiation and propagation. It can be concluded that TiNi shape memory alloy has a bright prospect as a solid pressure source.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 415
Copyright
Copyright © Materials Research Society 1992

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References

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