Porcelain pistil plate

Friction is electromechanically generated between a small, stationary, cylindri-cally shaped porcelain pistil having a rough spherical end surface and a rough jx>rcelain plate bearing a sample. The normal force between the porcelain pistil and the plate is changed. The normal force at which 50% of initiations occur is usually reported as the friction sensitivity measure. 

The BAM Friction Sensitivity Apparatus is shown in Figure 2.11. The operation mode of the apparatus is as follows. Friction is created electromechanically between the cylindrical porcelain pistil and the plate bearing the sample. The pistil and the plate are of definite roughness. The size and the shape of the plate and the pistil are shown in Figure 2.12. 

Approximately 10 mg of dry explosive is placed on the rough porcelain plate which is attached to the sliding carriage of the apparatus. The cylindrical porcelain pistil, which is clamped in its carriage, is then lowered to the top of the sample by means of the loading arm. The loading arm is loaded by a... 

Figure 2.12. The shape and the size of the porcelain pistil (a) and flie plate (b)...

The porcelain plate and the pistil must be replaced for each new testing. 

Table 2.7. The dependence of the normal force between the porcelain plate and the pistil upon the mass of the weight and its position on the loading atm in the BAM Friction Apparatus...

---