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    • 35. 发明申请
    • BIAXIAL STRESS MANAGEMENT
    • 双向应力管理
    • US20100236339A1
    • 2010-09-23
    • US12678342
    • 2008-09-24
    • David John ButtleJohn McCarthy
    • David John ButtleJohn McCarthy
    • G01L1/12
    • G01L1/127G01L1/125
    • A method of measuring biaxial stress in an object of a ferromagnetic material in which material in a region (10) in the vicinity of a surface of the object is subjected to a conditioning method by application of a conditioning magnetic field that is at least initially at a high field strength. Values of biaxial stress within the said region are measured with an electromagnetic measuring probe (14) in at least two different orientations, the electromagnetic measuring probe (14) using an alternating measuring magnetic field that is at a field strength well below saturation. The conditioning may subject the region (10) to a low frequency alternating magnetic field (38, 58) initially at a high field strength, and gradually reducing the strength to zero over a decay time period at least equal to the time for many cycles of the low frequency magnetic field. Conditioning the material enables the stress to then be measured more accurately, and enables ambiguities in biaxial stress to be resolved.
    • 一种在铁磁材料的物体中测量双轴应力的方法,其中在物体表面附近的区域(10)中的材料通过施加调节磁场进行调节方法,所述调节磁场至少最初处于 高场强。 所述区域内的双轴应力值以至少两个不同取向的电磁测量探针(14)测量,所述电磁测量探头(14)使用场强远低于饱和度的交变测量磁场。 调节可以使区域(10)最初以高场强度进入低频交变磁场(38,58),并且在衰减时间段内逐渐地将强度降低到零,至少等于许多周期的时间 低频磁场。 调整材料能够更准确地测量应力,并使双轴应力模糊化得到解决。