Abstract
This work presents a non-destructive method for quantitative essessment of fatigue damage of materials with linear elastic properties using nonlinear ultrasonic techniques. A nonlinear study was conducted on these materials with fatigue and shot peening processing using a nonlinear ultrasonic technique. A numerical method based on the semi-analytical finite element (SAFE) technique, was used to obtain the phase-matching modes of the specimens. Experiments confirm that the nonlinearity for shot peening and samples with a certain level of fatigue shows a tendency to increase with levels of fatigue.
Highlights
IntroductionResearch on the safety of the structure and research on the optimization and weight reduction of parts are becoming more important
Driving Safety is seriously affected by malfunction or damage of materials with linear elastic properties, such as tension rods, ton-shoulders, and springs used in vehicles
One of the NDT methods, the nonlinear guided ultrasonic flaw detection method, to investigate the nonlinear tendency of a shot peening specimen method, was was usedused to investigate the nonlinear tendency of a shot peening specimen ac- according to the surface change, and it was confirmed that the nonlinear tendency increase cording to the surface change, and it was confirmed that the nonlinear tendency increase when the sub surface grain structure changed due to the shot peening
Summary
Research on the safety of the structure and research on the optimization and weight reduction of parts are becoming more important. Research on these materials is of a great concern. The life evaluation of materials with linear elastic properties is performed through the Nakamura fatigue test, which is one of the destructive evaluation techniques. This technique consumes considerable time and cost. In addition to life evaluation, to improve the durability, life, and performance of a spring, a cold working process called shot peening is performed on these materials. Surface cracks do not propagate well in materials subjected to compressive stress, so the propagation of micro-cracks on the surface of the material can be prevented through shot peening
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