Gurneys Model

As was already discussed in Chapter 7.1 (shaped charges), it is not only the detonation velocity, but also the so-called Gumey velocity, that determines how quickly metal fragments are ejected from an explosive charge with a specific shape (bombs. 

The fragment velocity is largely dependent on the shape of the charge. For cylindrical charges (which are a good approximation for most bomb and missile (rocket) warheads) (Fig. 7.20)  

The constant is the so-called Gurney velocity (in km s ), which is dependent on the nature of the explosive. 

Spherical charges (Fig. 7.20) which have initiating charges in the centre and are used as an approximation for grenades (and many cluster bombs), have a similar relationship  

Charges in the shape of a symmetrical sandwich (Fig. 7.20) (e.g. reactive armor) 

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We have tried to correct some omissions and errors which can not be avoided in a first edition and have also updated the references where appropriate. In addition, five new chapters on Combustion (Ch. 1.4), NIR formulations (Ch. 2.5.5), the Gurney Model (Ch. 7.3), dinitroguanidine chemistry (Ch. 9.4) and nanothermites (Ch. 13.3) have been included in the English edition. The chapter on calculated combustion parameters (Ch. 4.2.3) has been extended. 

Figure 27.7. Comparison of various Gurney model configurations.

Benham (Ref 10) extended the Gurney model to include this factor. The 60°-cone-base angle is replaced in this model by the base-cone angle 0. The mass of the tamping cylinder is... 

The use of the Gurney model enabled us to predict the initial velocity of fragments that were produced by the explosion of a cased cylindrical charge. It is of great interest in relation to warhead design as well as to safety analyses, to be able to predict or estimate the number and size distribution of such fragments. 

A less simple Gurney model a second modification to the Debye-Hiickel model... 

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