Design parameters Shock

In this chapter, we will review the effects of shock-wave deform.ation on material response after the completion of the shock cycle. The techniques and design parameters necessary to implement successful shock-recovery experiments in metallic and brittle solids will be discussed. The influence of shock parameters, including peak pressure and pulse duration, loading-rate effects, and the Bauschinger effect (in some shock-loaded materials) on postshock structure/property material behavior will be detailed. 

The need for data on the parameters is neither unique to the application of azides and solid explosives nor to the design of explosive-train elements, and numerous references to measurement techniques and relevant data are to be found throughout these two volumes and in standard handbooks [ 1 ]. However, the data on functional parameters, particularly within the constraints of element designs, represent a unique requirement, particularly because of the hazardous nature of the materials, the rapidity of the reactions involved, and the small quantities and dimensions available for measurement probes. In Section D of this chapter some recent techniques of measurement or observation are presented to illustrate current trends. One of the important parameters affecting the initiation and growth of reaction in the explosives is their vulnerability to shocks. Some recent techniques for quantifying these parameters are given in Section E below. 

The program produces different output including tables of thermodynamic and equilibrium data and information about the iteration procedures. The report provides particular information on rocket performance, detonation, and shock parameters that helps to decide the appropriate rocket design in the engineering process. 

From a practical point of view, it is important to be able to predict AT. . Furthermore, it is only by understanding the various parameters that affect thermal shock that successful design of solids which are resistant to it can be carried out. In the remainder of this section, a methodology is outlined for doing just that, an exercise that will by necessity highlight the important parameters that render a ceramic resistant to thermal shock. 

The shock wave impacts from same explosives with different masses follow the geometry similarity law in the space before the shock waves meet the boundaries or obstacles. For an explosive with packed radius rl, the super pressure of shock wave front at 7 1 is AP and if the second explosive with rl, the super pressure of shock wave front at Rl is AP. These two explosives are similar in geometries of packing. The geometric similarity rate is of practical importance for the design of engineering. The experiments can be smdied with small amount of explosives and measure all parameters in free field. The conditions of explosion with large amount explosives can be calculated/predicted based on the experiments. It helps to reduce the experiment numbers and lower the cost of experiments. 

The quench test was performed on two of the sintered bars, as representative samples, designated as Samplel Sample3 , (10 0.13 mm X 10 0.13 mm in cross section). The notation Samplel Sample3 corresponds to two bars having a difference in geometry, primarily thickness ail other processing parameters being exactly the same for both. The thickness was varied in order to study the influence of sample size on the response to thermal shock treatment. 

While the length/diameter ratio is an important parameter in shock tube design, its effect on the shock compression efficiency is not very significant over a wider range. However, at lower pressure ratios its effect is more considerable. For a shock strength Ils = 1.8, the variation is only... 

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