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Required grades of hull steel plates in consideration of fracture toughness; Hakai jinsei wo koryoshita sentaiyo koban shiyo kubun ni kansuru ichikosatsu

Abstract

This paper discusses the required grades of hull steel plates based on the steel ship rule of Nippon Kaiji Kyokai (NK). The minimum value of the allowable crack length in NK rule (critical safety crack length at 0degC just before brittle unstable crack causing fatal fracture) was estimated. In the case where the estimated crack tip exists in a matrix, the crack length was a minimum of 200-210mm, while nearly 60mm in a fusion line at high-heat-input welded joint. The allowable crack lengths estimated from a specified value in the NK rule were fairly different. The allowable crack length at 0degC was also estimated from the minimum value in V-notch Charpy impact test. The private proposal on the required grades of hull steel plates in consideration of fracture toughness was discussed. Thirty-five percent of crack lengths found in real ships is 100mm or less, however, cracks of 250-400mm long are frequently found suggesting the allowable crack length of 400mm. The required grade integrally considering required values and design conditions is demanded to secure the reliability of hull strength. 5 refs., 5 figs., 2 tabs.
Authors:
Yajima, H; Yamamoto, M; Ogaki, Y [1] 
  1. Hiroshima University, Hiroshima (Japan). Faculty of Engineering
Publication Date:
Oct 01, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98750999; CONF-9711147-
Reference Number:
SCA: 360103; 320204; 420500; PA: JP-97:0G4506; EDB-98:074502; SN: 98001944442
Resource Relation:
Conference: 95. meeting of the West Japan Society of Naval Architects, Seibu zosenkai dai 95 kai reikai ronbun kogai, Osaka (Japan), 14-15 Nov 1997; Other Information: PBD: 1 Oct 1997; Related Information: Is Part Of Summary of the papers of the 95th Meeting of the West Japan Society of Naval Architects. Joint meeting of three shipbuilding societies in fall, fiscal 1997; PB: 168 p.; Seibu Zosenkai dai 95 kai reikai ronbun gaiko. 1997 nendo shuki zosen sangakkai rengo koenkai
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; BODY; SHIPS; PLATES; STEELS; SAFEGUARD REGULATIONS; FRACTURE PROPERTIES; FRACTURE MECHANICS; CLASSIFICATION; TOLERANCE; CRACKS; WELDED JOINTS; HEAT AFFECTED ZONE; CHARPY TEST; SAFETY ENGINEERING; RELIABILITY
OSTI ID:
622797
Research Organizations:
West Japan Society of Naval Architects, Fukuoka (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98750999; TRN: JN97G4506
Availability:
Available from West Japan Society of Naval Architects, 10-1, Hakozaki 6-chome, Higashi-ku, Fukuoka-shi, Fukuoka, (Japan); OSTI as DE98750999
Submitting Site:
NEDO
Size:
pp. 143-146
Announcement Date:

Citation Formats

Yajima, H, Yamamoto, M, and Ogaki, Y. Required grades of hull steel plates in consideration of fracture toughness; Hakai jinsei wo koryoshita sentaiyo koban shiyo kubun ni kansuru ichikosatsu. Japan: N. p., 1997. Web.
Yajima, H, Yamamoto, M, & Ogaki, Y. Required grades of hull steel plates in consideration of fracture toughness; Hakai jinsei wo koryoshita sentaiyo koban shiyo kubun ni kansuru ichikosatsu. Japan.
Yajima, H, Yamamoto, M, and Ogaki, Y. 1997. "Required grades of hull steel plates in consideration of fracture toughness; Hakai jinsei wo koryoshita sentaiyo koban shiyo kubun ni kansuru ichikosatsu." Japan.
@misc{etde_622797,
title = {Required grades of hull steel plates in consideration of fracture toughness; Hakai jinsei wo koryoshita sentaiyo koban shiyo kubun ni kansuru ichikosatsu}
author = {Yajima, H, Yamamoto, M, and Ogaki, Y}
abstractNote = {This paper discusses the required grades of hull steel plates based on the steel ship rule of Nippon Kaiji Kyokai (NK). The minimum value of the allowable crack length in NK rule (critical safety crack length at 0degC just before brittle unstable crack causing fatal fracture) was estimated. In the case where the estimated crack tip exists in a matrix, the crack length was a minimum of 200-210mm, while nearly 60mm in a fusion line at high-heat-input welded joint. The allowable crack lengths estimated from a specified value in the NK rule were fairly different. The allowable crack length at 0degC was also estimated from the minimum value in V-notch Charpy impact test. The private proposal on the required grades of hull steel plates in consideration of fracture toughness was discussed. Thirty-five percent of crack lengths found in real ships is 100mm or less, however, cracks of 250-400mm long are frequently found suggesting the allowable crack length of 400mm. The required grade integrally considering required values and design conditions is demanded to secure the reliability of hull strength. 5 refs., 5 figs., 2 tabs.}
place = {Japan}
year = {1997}
month = {Oct}
}