Aluminum and copper cylindrical shells were plastically buckled under quasi-static and dynamic loading conditions with an Absorption Compression-Torsion Plasticity (ACTP: Patent No. WO 2005090822) combined mechanical testing device. Optical microscopy and transmission electron microscopy (TEM) analysis were used to study the microscopic evolutions in the mechanically buckled aluminum and copper alloy samples. Optical microscopy showed evidence of the presence of second-phase particles in both the aluminum and copper alloys samples. Under dynamic loading aluminum samples showed more energy absorption as compared to copper samples. Material flow lines were more pronounced in the copper samples when observed by optical microscopy. The evidence that supports the increased energy absorption in the aluminum cylindrical shells can be supported by the TEM analysis more than the optical microscopy analysis. The TEM results showed highly oriented textured morphology with the presence of few dislocation cells structures and sub-structures.

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A corrosion-testing apparatus which operates in the field and which willdetermine the comparative resistance of various ferrous materials to corrosionby gaseous hydrogen sulfide at ordinary temperatures is described. Theprinciple of the uniform method of testing is to allow natural gas containinghydrogen sulfide, direct from its source in the field, to flow over the groupof specimens for a given period of time, and subsequently to estimate thecorrosion sustained by each specimen by determining its loss in weight. Thecomparative results obtained when specimens of 47 representative ferrousmaterials of described typical composition were tested at ordinary temperatureswith natural gas containing hydrogen sulfide are given in tables showingaverage penetration of metal, inches per year. The primary purpose of the work was to determine the possible utility to thepetroleum and natural gas industries of ferrous materials that are commerciallyavailable, and no attempt is made to discuss the results of the tests from themetallurgical standpoint. The following is a summary of the resultsobtained:Steels containing 12 to 27 per cent of chromium showed the highestresistance to corrosion. The presence of nickel in these high-chromium steelsdid not affect their resistance.Steels containing approximately 5 per cent of chromium showed comparativelyhigh resistance, but somewhat less than that of the highchromium steels.