Abstract
In this paper, we propose a method for monitoring surface defects like cracks in highly loaded structures. This method is based on the ability of surface cracks to open under the influence of external loads, thus causing the appearance of stresses and tears in the sensitive element—thin films that were deposited on the surface of the test object. We developed a system for monitoring surface defects based on a distributed crack sensor, the functional scheme of the sensor and its design, the structural scheme and algorithm of the system operation, and its model as a VHDL (VHSIC (Very high speed integrated circuits) Hardware Description Language)-description.
Highlights
The monitoring of defects occurring through the operation of highly loaded structures is important for the economy and for people’s safety
We developed the algorithm for the operation of the surface defect monitoring system
We considered a system for monitoring surface defects based on a distributed crack
Summary
The monitoring of defects occurring through the operation of highly loaded structures is important for the economy and for people’s safety. The case when stresses normal to the crack walls are applied to a surface-cracked object is studied This case is known as a tensile or opening mode. The authors developed a model of a layered structure in which a thin metal film was deposited on a dielectric polymer material located above a surface crack [11]. This model indicated that tensile stresses create a high level of stress in a thin metal film over a crack (as a result of modeling an aluminum plate with a 50 μm depth crack and coated with 50 μm thick polyimide film and 30 μm thick copper film, 12–13.5 GPa stress appeared in the copper film material above the crack) and can lead to its rupture.
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