| 摘要 |
The stress or strain in a magnetic workpiece is measured by a method in which the workpiece is locally magnetized by a constant magnetic field, an eddy current probe is placed adjacent to the workpiece, and an electrical characteristic of the probe, which is proportional to stress or strain in the workpiece is measured. The measured value is compared to calibration data to obtain the actual stress or strain. By continually subjecting the workpiece to a constant magnetic field, a maximum value of applied stress can be determined by making a first measurement before an external force is applied to the workpiece and making a second measurement after the force is removed. The difference between the two measurements is proportional to the maximum stress applied to the workpiece by the force between the two measurements. If stress or strain in a nonmagnetic workpiece is to be measured, a layer of magnetic material is bonded to the workpiece at the measurement point. |
