Showing papers in "Ndt & E International in 1988"
TL;DR: In this article, a non-destructive method was proposed to evaluate ropes, cables, and strands for flaw and tension detection by detecting vibrational wave amplitude and distribution patterns resulting from striking a test subject with a transverse force.
Abstract: A non-destructive method evaluates ropes, cables, and strands for flaw and tension. The method permits detecting flaws by recognizing certain vibrational wave amplitude and distribution patterns resulting from striking a test subject (12) with a transverse force. Tension on a test subject (12) is calculated by measuring propagation velocity of the vibrational waves through the test subject (12). An apparatus (10) is provided which produces vibrational waves (14) in a test subject (12), measures the amplitude and time distribution of the waves (20), and displays the measurements (38) for analysis.
41 citations
TL;DR: In this article, the coercive field strength and the amplitude of the magnetic Barkhausen noise are measured in a location-dependent manner over the region of the component to be tested.
Abstract: A method and apparatus for ascertaining internal stresses in a hardened region to be tested for a component made of a predetermined material includes measuring coercive field strength and amplitude of magnetic Barkhausen noise as a function of mechanical stress and hardness in calibration samples of a predetermined material of known hardness and known internal stress. Calibration functions are ascertained from the measured values indicating the dependency of the hardness and the amplitude of the magnetic Barkhausen noise as functions of the hardness and mechanical stress. The coercive field strength and the amplitude of the magnetic Barkhausen noise is measured in a location-dependent manner over the region of the component to be tested. The measured values of the coercive field strength and the amplitude of the magnetic Barkhausen noise are converted in the region to be tested into location-dependent hardness and into location-dependent mechanical stress using the ascertained calibration functions. The location-dependent mechanical stress and the location-dependent hardness in the region to be tested are present independently of one another and are available for further processing.
28 citations