Crack arrestability of ship hull steel plate in accidental conditions: Application of high arrestability endowed ultra fine-grain surface layer steel
Conference
·
OSTI ID:403612
- Oita R and D Lab. (Japan)
- Nippon Steel Corp., Oita (Japan). Oita Works
- Nippon Steel Corp., Futsu, Chiba (Japan). Steel Research Labs.
- Mitsubishi Heavy Industries, Ltd., Nagasaki (Japan)
- Univ. of Hiroshima (Japan)
A new type steel plate with ultra fine-grained surface layers (SUF steel) has been developed to improve crack arrestability. The application of this new type steel makes it possible to prevent catastrophic brittle fracture accidents of ship hull structures in emergency conditions, such as in serious collisions or groundings. It will reduce further the risk of casualties and environmental pollutions, caused by accidents of large crude oil carriers (VLCCs). The authors have investigated the validity for the application of the new type steel with ultra-high crack arrestability. Both computer simulations for collision of two VLCCs and large-scale fracture testings for crack arrestability have been carried out to study the accidental cases. The simulation results suggest that a collision generates a significant amount of plastic strain damage for the hull plate around a struck part. For example, the sheer strake plate near the struck part suffers 5 to 10% of plastic strain, before an inner-hull ruptures. Therefore, the effect of plastic strain (10% level) on crack arrestability of steel plates (the SUF plate and a conventional TMCP plate) was examined by standard ESSO tests, ultra wide-plate duplex ESSO tests, and sheer strake model tests. The test results are as follows: (1) Plastic strain deteriorates crack arrestability of steel plates. (2) Sufficient crack arrestability at 0 deg. C cannot be expected in the conventional TMCP steel plate plastically strained by about 10%. (3) The SUF plate maintains high crack arrestability even after introducing 10% plastic strain, at design temperature of 0 deg. C.
- OSTI ID:
- 403612
- Report Number(s):
- CONF-9606279--; ISBN 0-7918-1492-0
- Country of Publication:
- United States
- Language:
- English
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