Metal structures and components of the damage occurred Capacitor AC Metallized Polypropylene  primarily due to a variety of micro-and macro-mechanical stress concentration led to fatigue failure, and the basic performance characteristics of the material below the limit of static strength alternating stress continuing role, the various types of micro-generation Internal defects, and a gradual evolution of the macro-crack, crack propagation eventually lead to structural damage. Thus, fatigue analysis, effective stress and deformation evaluation of the situation, the development of cracks of the future location, size and direction of a rating metal parts and components of the structural strength and reliability of an important basis for. In order to identify the most timely and accurate mechanical stress and deformation region in the 20th century, the late 1990s, Dubov representative of the Russian scholars for the first proposed a new diagnostic technology - metal magnetic memory testing. In this paper, using PIC microcontroller, the design of cost-effective portable Magnetic Memory Tester, a low-cost, low power consumption and rapid detection, and other characteristics, to meet the Capacitor AC Metallized Polypropylene  various occasions, especially hard to reach parts of the stress concentration area detection.
   
Magnetic Memory Testing

Ferromagnetic studies show that when the elastic stress in ferromagnetic materials, iron magnets will not only produce elastic strain, but also the nature of a magnetostrictive strain to change the spontaneous magnetization direction, and this is magneto-elastic effects. According to "the actual existence of the state must be the minimum energy state" principle, the role of magnetic mechanical effects arising from the workpiece within the magnetic domain reorientation order to increase the magnetic elastic energy in the form of stress can be offset by the increase, resulting in ferromagnetic workpiece internally generated magnetic field intensity will be higher than the Earth's magnetic field strength, stress concentration in the area, a similar defect leakage distribution of the magnetic field, magnetic field tangential component Hp (x) maximum, and the weight of Hp (y) in the stress concentration along both sides of symbols change, the stress on the line had 0.1. Magnetic Memory detection technology is based on the principle of magnetic memory effect new nondestructive testing methods. Detection of magnetic memory technology in the geomagnetic environment, through ferromagnetic materials manufactured by the workpiece surface scattering method to the magnetic field component Hp (y) Capacitor AC Metallized Polypropylene  measurements to determine the workpiece stress concentration region, thereby effectively forecast the defective region.