KR20170066932A - Cruciform fatigue life enhancement structure forms when natural gas tankers - Google Patents

Cruciform fatigue life enhancement structure forms when natural gas tankers Download PDF

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Publication number
KR20170066932A
KR20170066932A KR1020150173176A KR20150173176A KR20170066932A KR 20170066932 A KR20170066932 A KR 20170066932A KR 1020150173176 A KR1020150173176 A KR 1020150173176A KR 20150173176 A KR20150173176 A KR 20150173176A KR 20170066932 A KR20170066932 A KR 20170066932A
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KR
South Korea
Prior art keywords
natural gas
fatigue life
welded
present
gas carrier
Prior art date
Application number
KR1020150173176A
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Korean (ko)
Inventor
전인재
Original Assignee
대우조선해양 주식회사
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Publication date
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to KR1020150173176A priority Critical patent/KR20170066932A/en
Publication of KR20170066932A publication Critical patent/KR20170066932A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/70—Reinforcements for carrying localised loads, e.g. propulsion plant, guns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2221/00—Methods and means for joining members or elements
    • B63B2221/02—Methods and means for joining members or elements by welding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The present invention relates to a structure for improving the fatigue life of a crush foam for a natural gas carrier.
To this end, the present invention is characterized in that a welded joint portion is formed in a region where stress is concentrated by applying a cross-sectional shape having a + shape to a crush foam structure.
Therefore, the present invention is capable of improving the fatigue life of a structure by eliminating the welded joint of the stress concentration portion conventionally used in the crush foam structure and preventing the decrease in the fatigue life due to welding by applying the + type rolled steel product.

Description

[0001] The present invention relates to a structure for improving the fatigue life of a crucible for a natural gas carrier,

The present invention relates to a structure for improving the fatigue life of a crush foam for a natural gas carrier, and more particularly to a method for improving fatigue life of a stress concentrated portion where a transverse bulkhead and an inner bottom meet.

Natural gas will be liquefied natural gas (LNG) with a reduction in volume by one-sixth when cooled to minus 162 degrees Celsius, and liquefied natural gas carriers are used for long-distance transport of liquefied natural gas.

Of the liquefied natural gas carriers, in the case of membrane type vessels, an insulation box is installed in the storage tank to prevent the liquefied natural gas from vaporizing. The installation of such a heat insulating box restricts the arrangement of the structural strength member, thereby creating a crush foam structure in which stress is concentrated.

Fig. Sectional view showing a crush foam for a natural gas carrier.

As shown in FIG. 4, the floor structure of the liquefied natural gas carrier provided with the natural gas storage tank is such that a portion where the inner bottom plate 10, 20 in the transverse direction and the transverse bulkheads 30, And are connected to each other by a connecting portion (21). The inner bottom plates 10 and 20 have a single shape and the transverse bulkheads 30 and 40 which are opposed to each other at the top and bottom of the inner bottom plate 10 and 20 are vertically separated, And is connected by a connection portion 21 made of welded joint.

However, such a structure has a problem in that a welded portion is formed at a portion where stress is concentrated at a position where the double bare legs are provided, so that the probability of occurrence of cracks at the welded portion increases and the fatigue life is reduced.

Open Patent Publication No. 10-2007-005821 (2007.06.08)

The present invention is capable of preventing stress concentration at a portion where a double bottom girder is located and solving the fatigue life reduction due to welding at a double bottom girder portion where stress concentration occurs.

The present invention is characterized in that a welded joint portion is formed in a region where stress is concentrated by applying a cross-sectional shape having a + shape to a crush foam structure.

The horizontal members are welded to the inner bottom plate by butt welds and the vertical members are welded to the transverse bulkheads by the butt welds to provide a relatively low stress concentration So that fatigue life reduction due to welding is reduced.

The welded joint portion has curved portions curved outward at the corners of each of the cross-sectional shapes, thereby relieving stress concentration.

The present invention can obtain the effect of eliminating the welded portion in the stress concentrated portion where the transverse bulkhead and the inner bottom plate of the natural gas carrier are joined.

Further, it is possible to obtain an effect of increasing the fatigue limit of the joining portion.

In addition, the fatigue life can be further extended by this.

1 is a front view showing a crush foam for a natural gas carrier according to the present invention;
2 is a perspective view showing a cruciform part of a crush foam for a natural gas carrier according to the present invention.
Fig. Sectional view showing a crush foam for a natural gas carrier.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a front view showing a crush foam for a natural gas carrier according to the present invention, and FIG. 2 is a perspective view showing a cruciform part of a crush foam for a natural gas carrier according to the present invention.

The crush foam according to the present invention can prevent the occurrence of cracks due to the concentration of stress in the portion where the transverse bulkhead and the inner bottom plate are joined, thereby improving the fatigue life.

As shown in FIG. 1 and FIG. 2, the crucible is provided such that a cross-section 60 having a + shape is applied to the cruciform structure. The crush foam is provided so that the welded joint portion 70 can be formed in the region (portion) where the stress is concentrated due to the positive shape.

The horizontal member 61 having the horizontal shape is formed in such a manner that the end portions of the horizontal member 61 abut against the inner bottom plate 80, Welded by the butt weld W in a state in which the welding is performed.

The vertical member 62 has a vertical shape and is configured to be welded by the butt weld W in the state where the end portions of the vertical member 62 are butted against each other.

That is, as the horizontal member 61 and the vertical member 62 are abutted against the end portions of the inner bottom plate 80 and the stroke partition wall 90 and welded together, stress is generated in a region having a relatively low stress concentration, It is possible to reduce the fatigue life reduction caused by the fatigue life.

The welded joint portion 70 has curved portions 71 curved outward at the corners of each of the sections 60, thereby relieving stress concentration and extending the fatigue life.

60: section steel
61: Horizontal member
62: vertical member
70: welded joint portion
71: Bunch
80: inner bottom plate
90: transverse bulkhead
W: Butt weld

Claims (3)

Wherein a welded joint portion is formed in a region where a stress is concentrated by applying a cross-sectional shape having a + shape to a crush foam structure.
The method according to claim 1,
Wherein the horizontal members are welded to the inner bottom plate by butt welds and the vertical members are welded to the transverse bulkheads by butt welds to occur in relatively low stress concentration zones And the fatigue life reduction due to welding is reduced. A fatigue life improving structure of a crush foam for a natural gas carrier.
The method according to claim 1,
Wherein the welded joint portion has curved portions curved outwardly at corners of each of the cross-sectional shapes, thereby relieving stress concentration of the crushed foam for a natural gas carrier.
KR1020150173176A 2015-12-07 2015-12-07 Cruciform fatigue life enhancement structure forms when natural gas tankers KR20170066932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150173176A KR20170066932A (en) 2015-12-07 2015-12-07 Cruciform fatigue life enhancement structure forms when natural gas tankers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150173176A KR20170066932A (en) 2015-12-07 2015-12-07 Cruciform fatigue life enhancement structure forms when natural gas tankers

Publications (1)

Publication Number Publication Date
KR20170066932A true KR20170066932A (en) 2017-06-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150173176A KR20170066932A (en) 2015-12-07 2015-12-07 Cruciform fatigue life enhancement structure forms when natural gas tankers

Country Status (1)

Country Link
KR (1) KR20170066932A (en)

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