导向波倾斜速度校正在异性质层状材料中的引导波倾斜速度
Ultrasonics
|May 30, 2023
概括
使用引导式超声波在异型结构中的损伤检测通过纠正波倾斜效应来改进. 这项研究量化了碳纤维层材的速度变化,提高了结构健康监测的准确性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 非破坏性测试是指非破坏性测试.
背景情况:
- 不同类型的材料,如碳纤维层层,表现出方向波传播.
- 引导式超声波对材料的性能和损坏非常敏感.
- 在异构介质中的波倾斜效应使速度测量和损坏定位变得复杂.
研究的目的:
- 在单向碳纤维增强板材中研究A0引导波模式的相位和组速.
- 通过实验和计算分析波倾斜对速度测量的影响.
- 开发和说明波倾斜效应的校正方法,以提高损坏检测的准确性.
主要方法:
- 使用导向超声波进行实验模式分析.
- 波传播的有限元分析 (FEA).
- 开发和应用一种用于波倾斜的速度校正方法.
主要成果:
- 测量和模拟了A0模式的相位和小组速度在碳纤维层中.
- 由于波倾斜而导致的显著速度偏移被量化为点和直线源.
- 拟议的校正方法与理论预测取得了良好的一致性.
结论:
- 波倾斜显著影响导向波速测量在异型复合材料.
- 波倾斜的校正方法可以提高速度计算的准确性.
- 准确的速度表征对于在复合结构中可靠检测损坏至关重要.
更多相关视频
09:54Author Spotlight: Enhancing Fiber Composite Laminate Quality with the Wet Hand Lay-Up/Vacuum Bag Process
Published on: June 30, 2023
2.2K
11:51Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
8.8K
相关概念视频
Unsymmetric Bending - Angle of Neutral Axis
363
Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
363
Velocity and Acceleration of a Wave
4.0K
A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it.
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time....
The velocity of the particles can be obtained by taking the partial derivative of the position equation with respect to time....
4.0K
Curvilinear Motion: Rectangular Components
506
Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the...
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the...
506
Transformation of Plane Stress
272
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
272
Steady, Laminar Flow Between Parallel Plates
248
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
248
Elastic Strain Energy for Shearing Stresses
234
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
234
