Abstract
Equipment, Programmes, Techniques and Projects. STRESS CORROSION TESTING MACHINE Saml. Denison & Son Ltd., Moor Road, Leeds 10, are now manufacturing a new environmental testing system — the T66 stress corrosion machine based on an original design licensed from British Aircraft Corporation (Operating) Ltd. of London. This machine is a four channel, vertical machine capable of testing 12 specimens simultaneously under load up to 10 tons (20,000 lb.). The specimens may be round or flat, three per channel, all loaded through special stainless steel holders and shackles. These shackles take over the specimen load when a specimen breaks, so maintaining load on the other specimens in the channel. Load is applied hydraulically and indicated on two facia dials. The hydraulic pressure is derived from an air/hydropump actuated by pressurised nitrogen. During a test the load on the specimens remains constant to plus or minus 100 lb. The environmental chamber consists of a polythene sleeve held in position by rubber O‐rings clamping on to Perspex top and bottom flanges thus making an airtight enclosure; into this can be fed the corrosive atmosphere. A salt‐spray unit is fitted in the centre for supplying one or all chambers. When sulphur dioxide is used, the supply from a cylinder is mixed with clean air and fed in via a flowmeter at 0.01–3 per cent mix.
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