As a solid-state welding process, Friction Stir Welding (FSW) offers a variety of advantages
over traditional welding processes. Problems that are typically occurring due to the cooling …

This article reports on the characterization of the “as-fabricated” state of Inconel 718 samples
fabricated using laser directed energy deposition (DED). Laser-DED is known to produce …

The ultrasonic backscatter signal can be used to evaluate the grain size of polycrystalline
media nondestructively. In this article, the joint time-frequency analysis is introduced into the …

Knowing propagating properties of an ultrasonic wave can enhance the non-destructive
testing techniques in alloy materials field, such as the electromagnetic acoustic transducer …

摘要用小波变换获取超声波能量的时间-尺度分布, 研究衰减系数随尺度的分布规律,
定义加权的超声多尺度衰减系数, 结合粒子群算法设计的最优尺度组合及其归一化权重分配策略 …

At Iowa State University's Center for Nondestructive Evaluation (ISU CNDE), the use of
models to simulate ultrasonic inspections has played a key role in R&D efforts for over 30 …

摘要制备晶粒尺寸不同的In718 合金试样, 采用经验模态分解(EMD) 研究超声背散射信号的时频
域特征, 分析晶粒尺寸对不同频段固有模态函数(IMF) 的影响, 并探求各IMF …

Diffuse ultrasonic backscatter is widely used to evaluate microstructural parameters of
heterogeneous materials. Recent singly scattered response (SSR) models utilize a single …

Cyclic loading of mechanical components promotes the formation of dislocation
substructures in metals as precursors to crack nucleation leading to final failure of the …

To solve such problems as sensitivity to noise and low accuracy of grain size evaluation
using traditional ultrasonic time-domain attenuation method, an ultrasonic nondestructive …