Slurry Iron Sand Carrier의 피로 강도 향상에 관한 연구

STX 조선해양 김대훈 과장

I. 선박의 일반적 특징

II. 연구 절차

III. 연구 결과 및 분석

IV. 결론

Contents

Iron - Sand 의 특징

Iron-Sand

Taharoa Port of New Zealand

Titanium

Vanadium

Loading Diagram

Slurry Carrier의 특징

Loading Sequence

Water

Iron-Sand saturated at water content

Cargo Condition

Ore Carrier Slurry Carrier

Slurry Carrier의 특징

I. 선박의 일반적 특징

II. 연구 절차

III. 연구 결과 및 분석

IV. 결론

Contents

Fatigue Crack

Fatigue Crack of Slot and Scallop DNV Classification Notes no.30.7

Fatigue Crack of Web Stiffener

F.E Modeling

Boundary Condition

Case Fraction Description

Loaded 0.5

External Internal Static

Ballast 0.35

External Internal Static

Design Loads

Case S.G

Loaded 4.6 (Dry Bulk)

3.3 (Wet Bulk)

Ballast 1.025

Load Case

Load

I. 선박의 일반적 특징

II. 연구 절차

III. 연구 결과 및 분석

IV. 결론

Contents

No.2 Stringer

No.3 Stringer

No.4 Stringer

No.1 Stringer

1. Stringer Face Plate Toe & Bracket Connection

W.T.BHD SECTION PLAN VIEW

Detail

W.T.BHD

Stringer Bracket toe

Position Fatigue Life(years)

Side Shell

No.2 STR 5.7

No.3 STR 3.5

No.4 STR 9.5

INNER HULL

No.2 STR 145.1

No.3 STR 15.5

No.4 STR 22.2

S_Shell

L_Bhd

1. Stringer Face Plate Toe & Bracket Connection

Fatigue Life

Modeling External Load in Loaded Condition

No.3 Stringer

Position Fatigue Life(years)

Case1 Case2

Side Shell

No.2 STR 5.7 21.2

No.3 STR 3.5 21.6

No.4 STR 9.5 45.0

INNER HULL

No.2 STR 145.1 -

No.3 STR 15.5 107.6

No.4 STR 22.2 -

Case1 Case2

1. Stringer Face Plate Toe & Bracket Connection

Detail

W.T.BHD

Stringer Bracket toe

Fatigue Life

Length

Radius

No.2 Stringer

No.3 Stringer

No.4 Stringer

No.1 Stringer

PLAN VIEW Web SECTION

2. Stringer & Web Connection i.w.o Void Space

Detail

Original (End Snip) Modify (End Gusset)

Web

FACE

Face

Web

4.0 years 57.6 years

2. Stringer & Web Connection i.w.o Void Space

Bracket

Bracket

Web SECTION

3. Web frame & Longitudinal Connection

Low Side Shell

Upper Side Shell

Hopper

Inner Hull

Collar Connection

Web Connection

Scallop Free Edge

Web SECTION Detail

D.W.G

3. Web frame & Longitudinal Connection (Lower Side Shell)

External Loaded Condition

Original Modify

용접선

3. Web frame & Longitudinal Connection (Lower Side Shell)

1.7 years 24.6 years

Web SECTION Detail

D.W.G

4. Web frame & Longitudinal Connection (Upper Side Shell)

Original Modify

용접선

4. Web frame & Longitudinal Connection (Upper Side Shell)

3.5 years 20.7 years

Web SECTION Detail

D.W.G

upper

Lower

5. Web frame & Longitudinal Connection (Inner Hull)

Scantling draft

Lower inner hull upper inner hull

5. Web frame & Longitudinal Connection (Inner Hull)

21.7 years 20.5 years

용접선

Web SECTION Detail

D.W.G

6. Web frame & Longitudinal Connection (Hopper)

Original Modify

용접선

6. Web frame & Longitudinal Connection (Hopper)

3.2 years 22.6 years

W.T.BHD SECTION Plan View

No.2 Stringer

No.3 Stringer

No.4 Stringer

No.1 Stringer

7. T.BHD & Vertical Stiffener Connection

D.W.G

Original Modify

용접선

8.4 years 23.9 years

7. T.BHD & Vertical Stiffener Connection

Detail

W.T.BHD WEB WEB

BOTTOM

8. T.BHD Lower Connection

Modeling

Position Fatigue Life(years) Remark

T.BHD FWD 49.6 V.Stiff.

AFT 43.1 Long’l

FWD SEC 34.0 Long’l

AFT SEC 33.4 Long’l

W.T.BHD WEB WEB

L.STIFFNER L.STIFFNER

L.STIFFNER

BRACKET

BRACKET

BRACKET

8. T.BHD Lower Connection

I. 선박의 일반적 특징

II. 연구 절차

III. 연구 결과 및 분석

IV. 결론

Contents

1. Stringer End Bracket

★ Toe length, Radius를 변경하여 최적화 설계

W.T.BHD

Stringer Bracket toe

Bracket Length

Bracket Radius

Ra가 증가 할 수록 Yield Utilisation Factor 증가(Common Structural Rules 참고)

2. Stringer Face Plate

★ Face Plate End 부 관통 Type으로 변경하여 Edge로 인한 응력 집중 제거

WEB

SNIP TYPE

관통

3. Slot Direction

용접선

Slot 방향은 Stress 분포를 파악하여 설정

4. 공법

용접선

Slit 공법을 이용하여 용접 최소화