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DONG Lihong
National Key Laboratory for Remanufacturing,
Academy of Armored Force Engineering,
Beijing 100072, China
Basic Course Department,
Ordnance Engineering College,
Shijiazhuang 050003, China
XU Binshi
DONG Shiyun
National Key Laboratory for Remanufacturing,
Academy of Armored Force Engineering,
Beijing 100072, China
CHEN Qunzhi
Aeronautical Technology Research Center, Beijing 100076,
China
WANG Dan
YIN Dawei
National Key Laboratory for Remanufacturing,
Academy of Armored Force Engineering,
Beijing 100072, China |
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EFFECT OF TENSILE STRESS AND RESIDUAL
STRESS ON THE SPONTANEOUS STRAY FIELD SIGNALS FROM THE SURFACE
OF 0.45%C STEEL*
Abstract:
In order to explore the quantitative method of metal magnetic memory testing(MMMT) and clarify the relationship between Hp(y), the normal component of spontaneous stray field, and applied stress or residual stress, the static tensile tests of 0.45%C steel sheet specimens are carried out on a servo hydraulic MTS810 machine. Hp(y) values are measured during the test process by an EMS-2003 metal magnetic memory diagnostic apparatus and a non-magnetic electric control displacement instrument. Residual stresses of some points on the surface of a specimen are measured by a Stress Tech X-Stress 3000 X-ray diffraction instrument. The results show that the same variation rules of Hp(y) value versus applied tensile stress are presented under the different conditions of load-on and load-off. However, the same rule does not exist between the Hp(y) value and residual stress. The variation of Hp(y) value reflects the history of applied tensile stress.
Key words:
Metal magnetic memory Spontaneous stray field Tensile stress Residual stress |