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SUMMARY:Application of Magnetic Sensor for Non-Destructive Stress Measurem
 ent for Steel Structures.
DTSTART:20120920T140000
DTEND:20120920T160000
DTSTAMP:20260510T131925Z
UID:01ca133868946e733c4c13dba713491b8ef12aa67623cfc26851a798
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. S. Akutagawa of Kobe University\, Japan (invited profess
 or at LMR)\nA magnetic anisotropy sensor is used for nondestructive measur
 ement of stress on surfaces of H-beams used as structural elements in tunn
 el support systems. The sensor is built on the principle of the magneto-st
 rictive effect in which changes in magnetic permeability due to deformatio
 n of a ferromagnetic material\, such as steel\, are measured and converted
  to absolute values of stresses existing on the surface of the material. P
 roper treatment of boundary conditions allows determination of stress tens
 or completely on surface of H-beam flanges\, with average error of 10 to 2
 0MPa.\nA series of stress measurement was conducted for Hbeams in NATM tun
 nels. The results obtained from the field stress measurement were in full 
 accordance with the findings made from the previous series of measurement 
 in a lab. The sensor used in this study is small\, easy to carry around ev
 en into a tunnel\, for example\, and allows direct\, nondestructive measur
 ement of absolute values of stresses on surface of steel. The use of this 
 sensor is not limited to H-beams and it can\nbe applied in any situation w
 here surfaces of steel\, in the forms of beams\, plates\, pipes\, walls\, 
 etc. are exposed for human access. Not only a direct use of the results of
  stress measurement is beneficial in numerous civil and mining engineering
  applications\, but also a secondary use of the information for interpreta
 tion of deformational behavior of structures in concern\, in this case a t
 unnel\, is also possible.\nA case study for evaluation of axial force in g
 round anchor is also introduced. With a unique characteristics of the magn
 etic sensor for stress reading during plastic deformation\, a novel method
  is briefly discussed for estimation of the maximum load exerted on a stee
 l product in the past.
LOCATION:GC D0 386
STATUS:CONFIRMED
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