Kolsky Stress Waves In Solids Pdf !!LINK!! Download
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Figure 2. A schematic of Kolsky bar setup. For an incident bar made of PZT, in the setup the incident bar is a thin beam while the transmission bar is made of thick beam. The dynamic recovery of the specimen is measured as a function of time. For the specimen, the incident bar and transmission bar are made of different materials. The compressive stress wave generated in the incident bar is transmitted into the specimen and is reflected at the specimen interface. The stress wave is shown schematically in the figure and the strain wave generated in the incident bar and in the specimen is shown in different colors. Image credit:
An improvement over the standard test setup is the utilization of the Kolsky bar setup as a dilatometer. A dilatometer is essentially a Kolsky bar with a system for monitoring the temperature of the bar. By proper choice of the materials, the effect of temperature on the dynamic stress strain response can be properly eliminated. It is observed that E’ and G can be obtained from the stress strain response in tension and compression, respectively. It is possible to determine the thermo-elastic properties of the material by measuring the stress strain response E, E’ and G in both tension and compression, and by monitoring the temperature of the specimen [20].
After the incident bar is removed from the specimen, the stress wave travels through the specimen and is measured as a function of time. The dynamic stress strain response of the specimen is characterized by three parameters viz. (a) E - elastic modulus, (b) E’ - linear part of the elastic modulus, and (c) G - shear modulus. The linear part of the elastic modulus E’, is usually used to characterize the elastic recovery of the specimen. Shear modulus G and stress strain response E are measured in both compression and tension. In case of any damage in the specimen, the stress strain response E will not be the same as that of the intact specimen.
The FEM simulation can also help to investigate the influence of the laser source parameters on the final results of the laser source. FEM simulation can be performed for the evaluation of the energy density and the intensity of the laser pulse. The laser source parameters such as the pulse width and the energy density can be calculated from the FEM simulation. The pulse width can be used in the ablation process and the energy density can be used to determine the properties of the ablation zone such as the ablation efficiency and the ablation rate. The thermal stress and the micro-structure at the back surface of the target can be modeled to determine the influence of the thermal stress on the material properties and the microstructure. FEM simulation allows to calculate the thermal stress and the micro-structural properties of the ablation zone, which can be further used to understand the mechanism of the laser ablation process. 827ec27edc