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EFFECT OF INTERFACE LAYER ON LAMB WAVE PROPAGATION IN SOLID ADHESIVE JOINTS: A PERTURBATION MODEL
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This paper presents a perturbation model for calculating the approximate Lamb wave velocities in solid adhesive joints. The numerical computations show that the approximate values of the Lamb wave velocities are very close to the exact ones if the thickness of the interface layer is small. A comparison of the perturbation analysis with the approximate "spring" model is given. The significance of the perturbation model is discussed for the inverse deduction of the mechanical properties of the interface layer from Lamb wave measurements. 相似文献
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本文采用一维流体模型导出了慢波介质自由电子激光器的线性色散方程,建立了电子和波相互作用的同向回旋同步机理和反向回旋同步机理. 相似文献
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本文利用固体层状媒质声反射模型,给出了固体中含气泡层声反射和透射系数的表达式,并由此导出沿固体中含气泡薄层对称和反对称模式界面波的特征方程式。本文还介绍了含气泡固体有效弹性模量的估算方法,文中给出的数值计算具体说明了气泡体积浓度和气泡层厚度对声反射系数、声透射系数以及反对称模式界面波传播速度的影响,本文的研究为根据声反射系数和界面波的传播速度的测量反演固体间气泡层的力学性能提供了理论依据。
关键词: 相似文献
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结合推导层状复合媒质各界面刚性联接时声导波频散特性方程的传递矩阵方法,以及滑移界 面边界条件和弱界面“弹簧”模型,分别导出了超薄层状复合媒质中存在不同深度弱界面、滑移界面和脱层情况下声导波的广义频散方程,分析了三种联接界面的深度对低模式声导波频散特性的影响.
关键词:
导波
界面
频散 相似文献
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运动介质反向散射波的演化谱 总被引:3,自引:0,他引:3
声呐、雷达和声达测量的运动介质反向散射波在补偿了能量衰减之后仍是非平稳随机过程。演化谱是描述它的良好手段,不平稳因子At(ω)和特征宽度BL有重要意义。当与散射体积元对应的时间尺寸小于BL时,反向散射过程的功率谱呈单峰特性;当超过BL时,功率谱呈双峰特性。选用具有平缓变化的模糊度函数的发射信号,可以减弱不平稳因子的作用。 相似文献
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R. KUMARS. DESWAL 《Journal of sound and vibration》2002,250(4):711-722
Propagation of waves in a cylindrical bore filled with viscous liquid embedded in a microstretch elastic medium is investigated. Frequency equation for the surface wave propagation near the surface of the cylindrical bore is obtained, characterizing the dispersive nature of the wave. Significant effects of viscosity, microstretch and micropolarity are observed. Some special cases have been deduced. 相似文献
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本文用动量和位置的线性组合作为算符,计算了极性晶体的表面或界面极化子的基态能量,结果表明,线性组合算符对于研究极性晶体的表面或界面极化子的性质也是适用的。
关键词: 相似文献
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SURFACE WAVE PROPAGATION IN A MICROPOLAR THERMOELASTIC MEDIUM WITHOUT ENERGY DISSIPATION 总被引:1,自引:0,他引:1
R. KUMARS. DESWAL 《Journal of sound and vibration》2002,256(1):173-178
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We have developed a method for visually measuring and evaluating stresses emitted from an ultrasonic probe into a model solid similar to the actual material, by using image-processing techniques and stroboscopic photoelasticity. The visualization of wave stress (sound pressure) distribution can be achieved by synthesizing two photoelastic pictures, in which the directions of the principal axes of linear polariscopes are different by 45 degrees. The sound pressure field generated by commercial ultrasonic probes was measured by using the proposed method. 相似文献
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本文首先分析了C3点群的去耦可能,计算了两个最可能去耦的弧矢面,C1点群是一个不动变换群,于是综合Koerber的结果,探讨了去耦的表面波模式群在点群中的分布规律。得知C3点群是不去耦的,这是因为它的对称性较低,而去耦的表面波模式群在点群中的分布规律呈现一定的周期性,即在每一个晶系重复出现去耦的情况。 相似文献
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椭圆偏振光谱法对固体和液体界面上抗原抗体反应动力学的研究 总被引:3,自引:0,他引:3
用气相沉积法将N-β-γ-氨丙基三甲氧基硅烷沉积在单晶硅表面,并用戊二醛将正常兔IgG抗原固定在硅烷化后的单昌硅表面上,然后用椭圆偏振光变法对固-液界面上的正常兔IgG抗原与羊-抗兔体反应动力学特性进行了研究。 相似文献
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The pure state dynamical evolution of the atomic as well as the field states in the two-photon Jaynes Cumming model with a Kerr-like medium for the field initially in the coherent state is investigated under the high-field approximation (\bar{n}>>1). Analytic expressions of the disentanglement conditions and the relevant disentangled states are derived, which are closely related to Kerr nonlinear coupling constant. This study also reveals that the initial atomic excited state can be evolved into the atomic dipole squeezed state. 相似文献