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Effect of prestrain on ductility and toughness in a high-strength line pipe steel
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Effect of prestrain on ductility and toughness in a high-strength line pipe steel
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Journal Article
Effect of prestrain on ductility and toughness in a high-strength line pipe steel
2020
Overview
Fracture properties of a mother plate for API grade X100 line pipe after pre-straining up to 6% are investigated using tensile notched bars and CT pre-cracked specimens. The material has an anisotropic plastic and damage behavior due to the thermo-mechanical control rolling process. Experiments evidence a decrease in both ductility and toughness for both rolling and long transverse direction with increasing prestrains. This effect is however more pronounced at low prestrain levels (
0
→
2
%
) than at higher levels (
2
→
4
→
6
%
). The modified GTN model proposed by Shinohara et al. (Int J Fract 197:127–145, 2016) is used to represent the database. A good agreement is obtained provided some damage model parameters are modified so as to obtain a slightly higher damage rate for the prestrained materials. This represents the fact that void growth tends to be faster for materials with a lower work hardening rate as evidenced by unit cell calculations. In addition, stress/strain distributions in test specimens are modified for reduced hardening so that stress triaxiality is increased at failure initiation points. This further lowers measured mechanical properties.
Publisher
Springer Netherlands,Springer Nature B.V,Springer Verlag
