Experimental assessment of tensile strength of corroded steel specimens subjected to sandblast and sandpaper cleaning

Review of Ultimate Strength Assessment of Ageing and Damaged Ship Structures

“…To determine the influence of the surface condition and normal maintenance actions on ship hull, new test series have been conducted on sandblasted and sandpaper cleaned specimens (Garbatov et al 2016a). An additional study was made to look at the effect of high-pressure-fresh-water-cleaning and corrosion cleaning by hammering on the mechanical properties of aged steel specimens .…”

“…An additional study was made to look at the effect of high-pressure-fresh-water-cleaning and corrosion cleaning by hammering on the mechanical properties of aged steel specimens . analysed the mechanical properties of five groups of corroded specimens, in addition to the ones already analysed in the study reported in (Garbatov et al 2016a), a total of 141 specimens, including non-cleaned, sand-blasted, sand-paper cleaned, high-pressure-fresh-watercleaning and cleaned by hammering specimens were experimentally analysed. The modulus of elasticity, yield stress, tensile strength, total uniform elongation, and their linear trend and associated uncertainties were analysed as a function of the degree of corrosion degradation and cleaning treatment procedure.…”

“…Specimen A, which is corroded and non cleaned specimens, was subjected to corrosion degradation and a less degree of erosion since the open seawater was circulating the specimens involving some microorganisms, shells, and sand. Additional to this environment, specimens B and C were subjected to massive erosion during the blasting and paper cleaning (Garbatov et al 2014b(Garbatov et al , 2016a, and specimen W were cleaned by high-pressure-fresh-water and specimen H were hammered, which distinguishes this treatment from others (see Figure 4). recognized that the existence of a high degree of uncertainties in the measurement is due to corrosion degradation, erosion, heating, and induced residual stresses due to cleaning processes unavoidably also leads to uncertainties in the mechanical properties, estimated thickness and reference net-section used for the stress calculation and structural analysis.…”

Aging Effects on Ship Structural Integrity

“…However, similar studies performed on plates and stiffened panels indicate that the influence of degradation on local collapse strength may be notified in certain cases. An on-going research on this subject deals with the influence of maintenance on the mechanical properties as well as to build more extensive database of results [6], [31].…”

“…Besides the fact that such degradation of mechanical properties needs more experimental evidences, there is a need to study the consequences on the structural integrity as degradation of mechanical properties has not been accounted for in the present rules for ship classification [6].…”