Experimental Study on Static Strength of Corrosive Mild Steel

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It is said that most of the hull damages to old ships are caused by corrosion and wear because ships are subjected to corrosive conditions at sea. Accordingly, in assessing the remaining lives of those ships, it is important to know how to estimate the strength of corrosive members. On the other hand it has been said that corrosive members often indicate the characteristics of brittleness even if they are mild steel at room temperature. So the authors experimentally confirmed that corrosive mild steel members in some cases, show a decrease in ductility, that is, elongation. Furthermore, it has been found that this phenomenon has been brought about by corrosive pits formed on their surfaces. The effects of corrosive pits on static strength have been studied parametrically by the simulation test in which artificial pits are formed on the surfaces of test specimens. Main conclusions obtained are as follows: (1) The characteristics of tensile strength in corrosive members are very similar to those of members with artificial pits on their surfaces. Then the tensile strength of corrosive members can be substituted by that of those with artificial pits. (2) Elongation of members with pits varies with the density and the depth of pits. That is, as density becomes high and the depth ratio (d/t) becomes large, the value of elongation decreases. (3) Ductile fracture of members with pits starts at the pits in the tensile test. Introducing the volume ratio V_p, the elongation can be represented as the following equation: ε_e/ε_<e0>=1/(1+k_eV_p) (k_e: constant) where k corresponds with the density of pits. (4) Absorbed plastic energy of members with pits is a function of V_p as well as the case of elongation, and can be represented as the hyperbolic relation: W/W_0=1/(1+k_pV_p) (k_p: constant)
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Experimental Study on Static Strength of Corrosive Mild Steel

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