A method for the detection of a paper tearing in a screw

摘要

The present invention relates to a method for detecting a in a cracking a thread (5), which has a plurality of turns (6) having a screw (2), when the load is applied to the screw with a force. It is essential to the invention in this case that a strain gauge (11) in a in the screw (2) formed hole (8) at the height of a maximally loaded region of the screw (2) thus positioned, and the measured local expansion of the screw (2) as a function of which the screw (2) force which is evaluated, wherein an incipient crack of the screw (2) is detected when the elongation of a linear dependence of the force deviates. Thus, the incipient crack precise and easy to detect.