Clamping area

The areas where a test piece is attached to clamps and cut edges are preferential sites for cracking. It is generally good practice to coat clamped areas with an ozone resistant paint (which does not affect the rubber in any way) but cut edges are best left. For most purposes a Hypalon-based paint is satisfactory. Clamps, even when made of material such as aluminium, should be soaked in ozone prior to use. Any pattern or flaws on the test piece surface will also tend to act as stress raisers and show preferential cracking. 

The present essential aspect for the decision in favour of a Diaphragm Pump is its hermetical tightness, which is guaranteed by its stationary and therefore free of wear clamping area. The Diaphragm Pump is the only type of reciprocating pump where the dynamic sealing is not in contact with the fluid. 

Samples were clamped on its base on a copper water cooled table (Fig 13), so that in addition to the electric arc-induced thermal shock of about 500°C/s, a gradient of approximately 500°C/mm was present in the clamping area, reproducing the temperature gradient of point C in figures 1 and 13. After peak temperature of 1870°C was reached, samples cooled down... 

The force balance includes three contributions (1) applied force or the total stress crxx times the clamp area Axx, (2) rxxAx due to the material resisting the deformation, and (3) the pressure P in the sample, again multiplied by the clamp area to give force. Because the clamp area is common to all, we can write the equation ... 

The package next enters a split female die, which travels at line speed downstream and is closed with a C-press, which injects the die into a belt-clamping system that butts a whole stream of the dies together. The dies are heated as they traverse the clamping area when they reach the end, the dies open, releasing cured stock, and return to the upstream C-press end of the die section. Operation is thus effected continuously. The part is cut to length with a flying saw. 

Check spoke wheels for cracks across spokes and in the web area or slippage in the clamp areas. 

The optical image of the film sample that had been elongated to 400% strain at 100 °C is shown in Figure 8.28a. The imaging area of 3.9 mm X 3.9 mm was selected at the border line of the clamp area (undeformed material) and at the... 

Part design should allow for sufficient clamping area and clearance for broaching tool. 

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