㪈㪅㪇㪜㪄㪈㪉 㪈㪅㪇㪜㪄㪈㪈 㪈㪅㪇㪜㪄㪈㪇 㪈㪅㪇㪜㪄㪇㪐 㪈㪅㪇㪜㪄㪇㪏
㪈㪇 㪈㪇㪇
ᔕജᄢଥᢙ䋨㪤㪧㪸㺕㫄䋩
䈐 ⵚ ㅴ ዷ ㅦ ᐲ 䋨㫄 㪆㫊 㪼㪺 䋩 㪢㪕㪌㪇㪅㪊
㪻㪸㪆㪻㫋㩷㪔㩷㪉㫏㪈㪇
㪄㪐㪈㪊㪅㪊㻡㪢㻡㪌㪇㪅㪊
㪻㪸㪆㪻㫋㩷㪔㩷㪊㫏㪈㪇
㪄㪈㪏㩷㪢
㪌㪅㪈㪏㪍㩷㩷㩷㩷㩷㩷㩷㩷
䋨ᦨㆡᦛ✢䋩 㪢㪓㪈㪊㪅㪊
㪻㪸㪆㪻㫋㩷㪔㩷㪉㫏㪈㪇
㪄㪈㪉࿑&$94ㅢᏱἹ᳓ⅣႺਛߢߩࠗࡦࠦࡀ࡞
㪈㪅㪇㪜㪄㪈㪉 㪈㪅㪇㪜㪄㪈㪈 㪈㪅㪇㪜㪄㪈㪇 㪈㪅㪇㪜㪄㪇㪐 㪈㪅㪇㪜㪄㪇㪏
㪈㪇 㪈㪇㪇
ᔕജᄢଥᢙ䋨㪤㪧㪸㺕㫄䋩
䈐 ⵚ ㅴ ዷ ㅦ ᐲ 䋨㫄 㪆㫊 㪼㪺 䋩
㪻㪸㪆㪻㫋㩷㪔㩷㪊㫏㪈㪇㪄㪈㪏㩷㪢
㪌㪅㪈㪏㪍㩷㩷㩷㩷㩿㪈㪊㪅㪊㻡㪢㻡㪌㪇㪅㪊㩷㪤㪧㪸㺕㫄䋩 㪻㪸㪆㪻㫋㩷㪔㩷㪉㫏㪈㪇
㪄㪐㩷㩷㩷㩷㩷 㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩿
㩷㪢㩷㩷㪕㪌㪇㪅㪊㪤㪧㪸㺕㫄㪀 㪻㪸㪆㪻㫋㩷㪔㩷㪉㫏㪈㪇
㪄㪈㪉㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩿㩷㪢㩷㩷㪓㪈㪊㪅㪊㪤㪧㪸㺕㫄㪀 㩷㩷㩷㩷න䋺㪻㪸㪆㪻㫋㩿㫄㪆㫊㪼㪺㪀䇮㩷㩷㪢㩿㪤㪧㪸㺕㫄㪀
࿑㪛㪄㪈㪋㩷㩷㩷㪙㪮㪩ㅢᏱἹ᳓ⅣႺਛ䈪䈱䉟䊮䉮䊈䊦㪈㪏㪉䈱
㪪㪚㪚䈐ⵚㅴዷㅦᐲ
ઃ㍳㧱 ࠪࡘ࠙࠼ߩഀࠇߦ㑐ߔࠆ߈ⵚㅴዷ⹏ଔ
Ἱᔃࠪࡘ࠙࠼㧔ࠬ࠹ࡦࠬ㍑㧘ࠗࡦࠦࡀ࡞㧕ߦೋᦼ߈ⵚࠍᗐቯߒ㧘ߊߟ߆ߩ೨ឭ᧦
ઙࠍቯߒߡ߈ⵚㅴዷ⹏ଔࠍⴕߞߚޕ
㧝㧚⹏ଔᣇᴺ
㧝㧚㧝 ⹏ଔࡕ࠺࡞
Ἱᔃࠪࡘ࠙࠼ߩඨᓘ㧔R㧕ߣ᧼ෘ(t)ߩᲧ(R/t)ߪ⚂ 50ߢࠆߩߢ㧘ᐔ᧼ߦᮨᡆߢ߈ ࠆޕߎߎߢߪ㧘Ἱᔃࠪࡘ࠙࠼ߩ H4㧘H7㧔⢵㧕㧘H6a㧔⢵㧕⛮ᚻࠍ᧼ෘ 50.8 mm㧘 H7⛮ᚻ㧔ࠪࡦ࠳㧕ࠍ᧼ෘ70 mm㧘H6a⛮ᚻ㧔ࡦࠣ㧕ࠍ᧼ෘ 75.8 mmߩᐔ᧼
ߦߘࠇߙࠇࡕ࠺࡞ൻߒߚޕ㧔࿑ E-1㧕
߹ߚ㧘H6a⛮ᚻ㧔ࡦࠣ㧕ߩ⹏ଔߦߟߡߪ㧘╴ߦࡕ࠺࡞ൻߒߚ⹏ଔ߽ⴕߞߚޕ (࿑E-2)
㧝㧚㧞 ᗐቯೋᦼ߈ⵚ
એਅߩ⹏ଔߦ߅ߡ㧘SCC⊒↢߹ߢߩẜફᦼ㑆ߪήⷞߒߡ㧘ೋᦼ߆ࠄ߈ⵚ߇ሽߔ
ࠆߣߒߡߦᗐቯߒߚޕ
ᗐቯߒߚ߈ⵚߪᷓߐ 50Ǵmߩඨᬦ߈ⵚ㧔߈ⵚࠕࠬࡍࠢ࠻Ყ a/"=0.1㧕ࠍᐔ᧼ߩ
㕙ߦᗐቯߒߚޕ㧔࿑E-1㧕
ߥ߅㧘ࡦࠣㇱߩ⹏ଔߦ߅ߡ㧘╴ߦࡕ࠺࡞ൻߒߚ႐วߦߪ㧘╴ᄖߦᷓߐ500 Ǵmᷓߐߩో߈ⵚࠍᗐቯߒߚޕ(࿑E-2)
㧝㧚㧟 ᔕജ᧦ઙ
ᒰㇱߦߪ㧘ᱷ⇐ᔕജ߮ㆇォᔕജ߇↪ߒߡࠆޕᣇะṁធㇱߦု⋥ߦ↪ߔ ࠆㆇォᔕജߪ߶߷ 0ߢࠆߩߢ㧘ߎߎߢߪㆇォᔕജߪ 0ߣߒߚޕ
Ἱᔃࠪࡘ࠙࠼⛮ᚻ㧔H4 (⛮ᚻᒻ⁁ 2⒳㘃)㧘H7㧔ࡦࠣࠅ㧘ࡦࠣήߒ㧕߮
H6a㧕ߩᱷ⇐ᔕജߪઃ㍳㧯ߩ⸃ᨆ⚿ᨐࠍ↪ߚޕ 㧝㧚㧟㧚㧝 H4ᣇะṁធㇱ
H4ᣇะṁធㇱߪṁធ⛮ᚻᒻ⁁߇2⒳㘃(⛮ᚻᒻ⁁㧝㧘⛮ᚻᒻ⁁ 2)ࠆޕߎࠇࠄ
ߞߡࠆߩߢ㧘ౝᄖਔ㕙߆ࠄߩ SCCㅴዷࠍ⠨ᘦߔࠆޕ
㧝㧚㧟㧚㧞 H7ᣇะṁធㇱ
H7 ߦߟߡߪࡦࠣ߇ࠆ࠲ࠗࡊߣή࠲ࠗࡊߩ 2࠲ࠗࡊ߇ࠆޕࡦࠣ߇
ࠆ࠲ࠗࡊߩ⹏ଔㇱߩ H7aߪࠬ࠹ࡦࠬ㍑ߩ᧚ṁធㇱߢࠆޕ⹏ଔㇱߪ⢵߅ ࠃ߮ࡦࠣߣߔࠆޕߎߩᱷ⇐ᔕജಽᏓࠍ࿑E-5߅ࠃ߮࿑E-6ߦ␜ߔޕࡦࠣ߇
ࠆ࠲ࠗࡊߩ⹏ଔㇱߩ H7bߪࠬ࠹ࡦࠬ㍑ߣࠗࡦࠦࡀ࡞ߩ⇣᧚ṁធㇱߢࠆޕ⹏ଔ ㇱߪࠪࡦ࠳㧔ࠗࡦࠦࡀ࡞ṁធ㊄ዻ㧕ߣߔࠆޕߎߩᱷ⇐ᔕജಽᏓࠍ࿑ E-7ߦ␜
ߔޕ
৻ᣇ㧘ࡦࠣ߇ή࠲ࠗࡊߩ H7ᣇะ⛮ᚻߪࠬ࠹ࡦࠬ㍑ߣࠗࡦࠦࡀ࡞ߩ⇣᧚ ṁធㇱߢࠆޕ⹏ଔㇱߪ㧘ࠗࡦࠦࡀ࡞ṁធ㊄ዻߩࠪࡦ࠳ߣߩႺ⇇ㇱ㧘ࠗࡦࠦ
ࡀ࡞ṁធ㊄ዻߩਛᄩㇱ㧘߮ࠬ࠹ࡦࠬ㍑ṁធᾲᓇ㗀ㇱߢࠆޕߎࠇࠄߩᱷ⇐ᔕ ജಽᏓࠍ࿑ E-8㧘࿑E-9߮࿑E-10ߦ␜ߔޕ
ࡦࠣ߇ࠆ࠲ࠗࡊߩࡦࠣㇱએᄖߩᱷ⇐ᔕജߪߣ߽ߦ㧘ౝ㕙ߢᒁᒛ㧘ᄖ㕙 ߢ❗㧔ࠆߪ߶߷ 0㧕ߩᔕജߣߥߞߡࠆߚ㧘ߎߎߢߪౝ㕙߆ࠄᄖ㕙߳
ߩ SCC ㅴዷߩߺࠍ⠨߃ࠆޕ߹ߚޔࡦࠣ߇ࠆ࠲ࠗࡊߩࡦࠣㇱߦ߅ߡߪ㧘ታ ᯏߢഀࠇ߇⏕ߐࠇߚౝ㕙߆ࠄߩ SCCㅴዷࠍ⠨߃ࠆޕ
㧝㧚㧟㧚㧟 H6aᣇะṁធㇱ
H6a ߩ⢵߮ࡦࠣߩᱷ⇐ᔕജಽᏓࠍ࿑ E-11߮࿑ E-12 ߦ␜ߔޕH6aߩ
⢵ߩᱷ⇐ᔕജߪౝ㕙ߢᒁᒛࠅ㧘ᄖ㕙ߢ❗ߣߥߞߡࠆߩߢౝ㕙߆ࠄ SCC ㅴዷࠍ⠨ᘦߔࠆޕ
H6aࡦࠣߩᱷ⇐ᔕജߪ㧘⢵᧼ෘࠍၮḰߦߔࠆߣ㧘ᄖ㕙߇ᒁᒛࠅߢ㧘᧼ෘਛ ᄩㇱ߮ౝ㕙߇❗ߣߥߞߡ߅ࠅ㧘ᄖ㕙߆ࠄߩ SCCㅴዷࠍ⠨ᘦߔࠆޕ
㧝㧚㧠 ᔕജᄢଥᢙ
ᐔ᧼ߩ㕙߈ⵚߩᔕജᄢଥᢙ㧔K㧕ߩ␜ᑼߣߒߡߪ㧘Wang 㧝 㧕ߩᓇ㗀㑐ᢙᴺߦ ၮߠߊਅᑼࠍ↪ߚޕ
ߥ߅㧘n=0 ߪ৻᭽ᒁᒛࠅᔕജ߇㧘n=1 ߪᦛߍᔕജ߇↪ߔࠆ႐วߢࠅ㧘ᑼ(1)ߢ
⸘▚ߐࠇࠆᔕജᄢଥᢙߪRaju-Newmanߩ⸃㧞 㧕ߦ߶߷╬ߒߎߣࠍ⏕ߒߡ ࠆޕ
৻ᣇ㧘ࡦࠣㇱࠍ╴ߦࡕ࠺࡞ൻߒ㧘ᄖోߦ߈ⵚࠍᗐቯߒߚ႐วߩᔕജᄢଥ ᢙߪᓇ㗀㑐ᢙᴺߦၮߠߚAPI-579㧟 㧕ߩਅ⸥4ᰴߩᔕജಽᏓߦኻߔࠆਅᑼࠍ↪ߚޕ
KI㧩[Goǻo㧗G1ǻ1(a/t)㧗G2ǻ2(a/t)2+G3ǻ3(a/t)3㧗G4ǻ4(a/t)4]лǸa (2) Go 㨪G4㧦ᓇ㗀ଥᢙ
a㧦߈ⵚᷓߐ 㨠㧦᧼ෘ
ߎߎߢ㧘ǻ0㨪ǻ4ߪਅ⸥ 4ᰴᔕജಽᏓߩ㨕ᰴߩᔕജᚑಽߢࠆޕ 0 1 2 2 3 3 4
X
4t X t
X t
(X) X 㧕
㧔 㨠 ǻ 㧗 㧕 㧔 ǻ 㧗 㧕 㧔 ǻ 㧗 㧕 㧔 ǻ 㧗 ǻ
ǻ
(3)X㧦ᄖ㕙߆ࠄߩ᧼ෘᣇะ〒㔌
㧝㧚㧡 SCCㅴዷㅦᐲ
Ἱᔃࠪࡘ࠙࠼ߩࠬ࠹ࡦࠬ㍑ߩSCCㅴዷ⹏ଔߩㅦᐲᑼߣߒߡઃ㍳㧰ߢᬌ⸛ߒߚ㧘
㍈ᢅൻSUS304߮ૐ⚛ࠬ࠹ࡦࠬ㍑㧔SUS304L㧘SUS316L㧘316NG㧕ߩૐᾖ
㗔ၞ߮㜞ᾖ㗔ၞߩ߈ⵚㅴዷㅦᐲ✢࿑߆ࠄਅ⸥ 1.5.1㧘1.5.2 㗄ߦ␜ߔㅴዷㅦᐲᑼࠍ ㆡ↪ߒߚޕ
৻ᣇ㧘ࠗࡦࠦࡀ࡞ṁធㇱߩ SCC ㅴዷ⹏ଔߩㅦᐲᑼߣߒߡ㧘ࠪࡘ࠙࠼ࠨࡐ࠻⹏
ଔߦ↪ߚਅ⸥1.5.3㗄ߦ␜ߔSCCㅴዷㅦᐲ✢࿑ࠍㆡ↪ߒߚޕ
㧝㧚㧡㧚㧝 ૐᾖ㊂㗔ၞ 㧔ਛᕈሶᾖ㊂㧨51024n/m2㧕
㧔㧝㧕ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔ዉ㔚₸㧨0.2ǴS/cm㧘ECP҈150mVSHE㧕 (i)㍈ᢅൻSUS304
da/dt㧩1.4310-10K2.161㧔3.4҇K҇57.9㧕 (4) da/dt㧩2.010-9㧔K㧨3.4㧕 (5)
da/dt㧩9.210-7㧔K㧪57.9㧕 (6)
(ii)ૐ⚛ࠬ࠹ࡦࠬ㍑
એ㧘ㅢᏱἹౝ᳓⾰ⅣႺਛߩSCCㅴዷ⹏ଔ✢࿑ࠍ࿑E-13ߦ␜ߔޕ
㧔㧞㧕᳓⚛ᵈⅣႺਛ㧔ዉ㔚₸㧨0.2ǴS/cm㧘ECP҇㧙200mVSHE㧕 (i) ㍈ᢅൻSUS304
da/dt㧩7.9410-12 K2.161㧔12.9҇K҇57.9㧕 (10) da/dt㧩2.010-9㧔K㧨12.9㧕 (11)
da/dt㧩5.110-8㧔K㧪57.9㧕 (12) (ii)ૐ⚛ࠬ࠹ࡦࠬ㍑
da/dt㧩3.3310-12K2.161㧔19.3҇K҇57.9㧕 (13) da/dt㧩2.010-9㧔K㧨19.3㧕 (14) da/dt㧩2.110-8㧔K㧪57.9㧕 (15)
㧔න㧦da/dt㧔mm/s㧕㧘K㧔MPaлm㧕㧕
એ㧘᳓⚛ᵈⅣႺਛߩSCCㅴዷ⹏ଔ✢࿑ࠍ࿑E-14ߦ␜ߔޕ
㧝㧚㧡㧚㧞 㜞ᾖ㊂㗔ၞ㧔ਛᕈሶᾖ㊂҈51024n/m2㧕 SUS304߮ૐ⚛ࠬ࠹ࡦࠬ㍑㧠 㧕
da/dt=7.810-2n3.6(CK4)n (16)
ߎߎߦ㧘㨍ߪ߈ⵚߩᷓߐ
nߪ㧘⣣㘩㔚㧘ዉ㔚₸㧘㍈ᢅൻᐲ߮ਛᕈሶᾖ㊂ࠍࡄࡔ࠲ߣ ߔࠆ߈ⵚవ┵㔚ᵹኒᐲᄌൻߦኻߔࠆቯᢙ
Cߪ㧘߈ⵚవ┵߭ߕߺㅦᐲᱜଥᢙߢએਅߩㅢࠅߢࠆޕ
(i) ਛᕈሶᾖ㊂߇1.41023n/m2એਅߩ႐ว
C=4.110-14 (17) (ii) ਛᕈሶᾖ㊂߇ 1.41023n/m2ࠍ߃㧘31025n/m2એਅߩ႐ว
㧝㧚㧡㧚㧟 ࠗࡦࠦࡀ࡞182 ߩSCCㅴዷㅦᐲᑼ
da/dt㧩310-15K5.186㧔13.3҇K҇50.3㧕 (20)
da/dt㧩2.010-9㧔K㧨13.3㧕 (21) da/dt㧩2.010-6 㧔K㧪50.3㧕 (22)
㧔න㧦da/dt㧔mm/s㧕㧘K㧔MPaлm㧕㧕
એ㧘ࠗࡦࠦࡀ࡞182ߩ SCCㅴዷ⹏ଔ✢࿑ࠍ࿑ E-15ߦ␜ߔޕ
ߥ߅㧘㍈ᢅൻSUS304߮ૐ⚛ࠬ࠹ࡦࠬ㍑ߩㅢᏱἹౝ᳓⾰ⅣႺਛ߮᳓⚛ᵈ
ⅣႺਛߩૐ K 㗔ၞ߮㜞 K 㗔ၞߩ࠺࠲ߪ᳃㑆⎇ⓥߢขᓧਛߢࠆޕ߹ߚ㧘ᾖ
ࠍ⠨ᘦߒߚ SCC ㅴዷ࠺࠲߽࿖ࡊࡠߢขᓧ੍ቯߢࠆޕᓥߞߡ㧘ᓟ㧘ᣂߚ ߥ࠺࠲߇ขᓧߐࠇߚ႐วߦߪᧄ⾗ᢱߢᬌ⸛ߒߚૐᾖ㗔ၞ߮㜞ᾖ㗔ၞߩㅴዷㅦ ᐲᑼࠍㆡᤨߦ⋥ߒߡⴕߊߎߣߣߔࠆޕ
㧞㧚K୯ಽᏓߩ⹏ଔ
㧞㧚㧝 㕙߈ⵚߩ᧼ෘᣇะߩ K୯ಽᏓ
H4⛮ᚻ(⛮ᚻᒻ⁁1)ߢߪ㧘ౝ㕙߆ࠄᄖ㕙߳ߩK୯ಽᏓߪ㧘ౝ㕙߆ࠄ17mm
⒟ᐲߩ⟎ߢᦨᄢ 31MPaлm ⒟ᐲߣߥࠆጊဳߩಽᏓࠍ␜ߒߡࠆޕ᧼ෘోߦࠊߚ ࠅ㧘K୯ߪ 0ߦߥࠄߥޕ㧔࿑ E-16㧕
H4⛮ᚻ(⛮ᚻᒻ⁁ 2)ߢߪ㧘ౝ㕙߆ࠄᄖ㕙߳߈ⵚ߇ㅴዷߔࠆߣߒߚ႐วߩ K ୯ߪ㧘ౝ㕙߆ࠄ 10mm ⒟ᐲߩ⟎ߢᦨᄢ 28 MPaлm ⒟ᐲߣߥࠆጊဳߩಽᏓࠍ␜
ߒߡࠆޕౝ㕙߆ࠄ᧼ෘᣇะ 25㨙㨙ߩ⟎ߢ K୯ߪ0ߣߥࠆޕ㧔࿑E-17(1)㧕
৻ᣇ㧘ᄖ㕙߆ࠄౝ㕙߳߈ⵚ߇ㅴዷߔࠆߣߒߚ႐วߩ K୯ߪᦨᄢ9MPaлm ߢ㧘ౝ㕙߆ࠄ᧼ෘᣇะ 18 mmᷓߐߢK୯ߪ 0ߣߥࠆޕ㧔࿑ E-17(2)㧕
H7⛮ᚻ㧔ࡦࠣࠅH7a⢵㧕ߢߪ㧘ౝ㕙߆ࠄᄖ㕙߳ߩK୯ಽᏓߪ㧘ౝ
㕙߆ࠄ 12mm⒟ᐲߩ⟎ߢᦨᄢ 33MPaлm⒟ᐲߣߥࠆጊဳߩಽᏓࠍ␜ߒߡࠆޕ
᧼ෘోߦࠊߚߞߡ K୯ߪ0ߦߥࠄߥޕ㧔࿑E-18㧕
H7⛮ᚻ㧔ࡦࠣࠅH7bࠪࡦ࠳㧕ߢߪ㧘ౝ㕙߆ࠄᄖ㕙߳ߩ K୯ಽᏓ
H7⛮ᚻ(ࡦࠣήߒṁធㇱਛᄩㇱ)ߢߪౝ㕙߆ࠄ30㨙㨙⒟ᐲߩ⟎ߢᦨᄢ30MPa лm⒟ᐲߣߥࠆጊᒻߩಽᏓࠍ␜ߒߡࠆޕ㧔࿑ E-21㧕
H7 ⛮ᚻ(ࡦࠣήߒṁធㇱࠬ࠹ࡦࠬṁធᾲᓇ㗀ㇱ)ߢߪౝ㕙߆ࠄ⚂ 20㨙㨙⒟
ᐲߩ⟎ߢᦨᄢ 28MPaлm⒟ᐲߣߥࠆጊᒻߩಽᏓࠍ␜ߒߡࠆޕ㧔࿑ E-22㧕 H6a ⛮ᚻ⢵ߢߪౝ㕙߆ࠄᄖ㕙߳߈ⵚ߇ㅴዷߔࠆߣߒߚ႐วߩ K ୯ߪ㧘
ౝ㕙߆ࠄ 14mm⒟ᐲߩ⟎ߢᦨᄢ 41MPaлm⒟ᐲߣߥࠅ㧘ᄖ㕙ߢ K=21MPa лmߩಽᏓࠍ␜ߒߡࠆޕ㧔࿑E-23㧕
H6a ⛮ᚻࡦࠣߢߪᄖ㕙߆ࠄౝ㕙߳߈ⵚ߇ㅴዷߔࠆߣߒߚ႐วߩ K ୯ ߪ㧘ᄖ㕙߆ࠄ 8mm⒟ᐲߩ⟎ߢᦨᄢ 27MPaлm⒟ᐲߣߥࠆጊᒻߩಽᏓࠍ␜ߒߡ
ࠆޕᄖ㕙߆ࠄ᧼ෘᣇะ 23mmߩ⟎ߢK୯ߪ 0ߣߥࠆޕ(࿑E-24)
㧞㧚㧞 ╴ࡕ࠺࡞ߩో߈ⵚߩ᧼ෘᣇะߩ K୯ಽᏓ
H6aࡦࠣㇱߦ߅ߡ㧘ᷓߐ 500Ǵmߩో߈ⵚ߇ㅴዷߔࠆߣߒߚ႐วߩK୯ߪᄖ
㕙߆ࠄ 9mm ⒟ᐲߩ⟎ߢ K ୯߇ᦨᄢ 49MPaлm ⒟ᐲߣߥࠆጊᒻߩಽᏓࠍ␜ߒߡ
ࠆޕᄖ㕙߆ࠄ᧼ෘᣇะ⚂ 28mmߩ⟎ߢK୯ߪ 0ߣߥࠆޕ(࿑E-25)
H7 ⛮ᚻ㧔ࡦࠣࠅࡦࠣ㧕ߢߪ㧘ౝ㕙߆ࠄᄖ㕙߳ߩ K ୯ಽᏓߪ㧘ౝ
㕙߆ࠄᓢޘߦჇടߒ 20mm ⒟ᐲߩ⟎ߢᦨᄢ 63MPaлm ⒟ᐲߣߥࠅ㧘ߐࠄߦᷓߊ ߥࠆߦߟࠇᓢޘߦૐਅߔࠆ߇㧘ᄖ㕙ઃㄭߢౣ߮ჇടߔࠆಽᏓࠍ␜ߒߡࠆޕ᧼ෘో
ߦࠊߚߞߡK୯ߪ 0ߦߥࠄߥޕ㧔࿑ E-26㧕
㧟㧚SCC߈ⵚㅴዷ㊂ߩᤨ㑆ଐሽᕈߩ⹏ଔ 㧟㧚㧝 㕙߈ⵚࠍߔࠆᐔ᧼ࡕ࠺࡞
⸘▚ߪ㧘ೋᦼ߈ⵚ߇ౝ㕙ࠆߪᄖ㕙߆ࠄ᧼ෘᣇะ߳ㅴዷߒߚ႐วߢⴕߞߚޕ
SCCㅴዷㅦᐲᑼߪ㧘1.5.1㗄߮1.5.3㗄ߩᑼࠍ↪ࠆޕߚߛߒ㧘IASCCࠍ⠨ᘦߔࠆᔅ
ⷐ߇ࠆߣ⠨߃ࠄࠇࠆH4⛮ᚻߦߟߡߪ㧘ᾖࠍ⠨ᘦߒߚ1.5.2㗄ߩᑼࠍ↪ߡ⹏ଔ ࠍⴕߞߚޕ߹ߚ㧘ೋᦼ߈ⵚ߇㧘ૐ㧷୯㗔ၞߢቯߒߚ৻ቯߩSCCㅴዷㅦᐲ㧔da/dt㧩2.0
10-9㧕ߢㅴዷߔࠆ႐วߪ㧘ߘߩ߈ⵚ߇ࠕࠬࡍࠢ࠻Ყa/"=0.1ߢㅴዷߔࠆߣቯߒߚޕ
H4⛮ᚻ(⛮ᚻᒻ⁁ 1)ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘ㅢᏱ
ᐲߢ᧼ෘߩ 50%߹ߢㅴዷߔࠆߎߣ߇␜ߐࠇߚޕ߹ߚ㧘᳓⚛ᵈ㧔HWC㧕ߦࠃࠅᄢ
ߦㅴዷ߇ᛥߐࠇߡࠆޕ㧔࿑ E-27(2)㧕
H4⛮ᚻ(⛮ᚻᒻ⁁ 2)ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘ㅢᏱ Ἱౝ᳓⾰ⅣႺਛ㧔NWC㧕ߩૐ⚛ࠬ࠹ࡦࠬ㍑ߢߪㆇォᤨ㑆⚂10ᐕ߆ࠄ߈ⵚㅴዷ߇ ᄢߦჇട㐿ᆎߒ㧘⚂ 40 ᐕએ㒠✭߿߆ߦ⇐ߔࠆะߦࠆޕᄖ㕙߆ࠄ᧼ෘᣇะ ߩㅴዷߪዊߐޕㆇォᤨ㑆 60 ᐕߣߒߚ႐วߢߪ㧘ౝ㕙߮ᄖ㕙߆ࠄߩㅴዷᷓߐ ߩߪ᧼ෘߩ50%⒟ᐲߢࠆޕ㧔࿑E-28(1)㧕
߹ߚ 㧘 ᳓⚛ ᵈ 㧔HWC㧕Ⅳ Ⴚ ਛ ߢߪ 㧘 ߈ⵚ ߩᄢ ߥㅴ ዷ߇ ή ߊ㧘 ㅴዷ ߇ ᛥ ߐ ࠇ ߡࠆߎߣ߇␜ߐࠇߚޕ㧔࿑ E-28(2)㧕
ᾖࠍ⠨ᘦߒߚ႐วߩH4⛮ᚻ(⛮ᚻᒻ⁁2)ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷ ࠍ㐿ᆎߒߚ႐ว㧘ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߩૐ⚛ࠬ࠹ࡦࠬ㍑ߢߪㆇォᤨ㑆⚂
15ᐕ߆ࠄ߈ⵚㅴዷ߇ᄢߦჇടߒ㧘⚂ 25ᐕએ㒠✭߿߆ߦ⇐ߔࠆะߦࠆޕᄖ
㕙߆ࠄ᧼ෘᣇะߩㅴዷߪዊߐޕㆇォᤨ㑆 60 ᐕߣߒߚ႐วౝᄖ㕙߆ࠄߩㅴዷᷓߐߩ
ߪ᧼ෘߩ⚂50 %ߢࠆޕ㧔࿑E-28(3)㧕
᳓⚛ᵈ㧔HWC㧕ⅣႺਛߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘 ᄢߦ߈ⵚㅴዷ㊂߇Ⴧടࠍ㐿ᆎߔࠆߩߪㆇォᤨ㑆߇ 30 ᐕએ㒠ߣߥࠅ㧘ㅴዷ߇ᛥߐ ࠇࠆߎߣ߇␜ߐࠇߚޕ㧔࿑ E-28(4)㧕
H7⛮ᚻ㧔ࡦࠣࠅH7a⢵㧕ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒ ߚ႐ว㧘ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߢߪ㧘ૐ⚛ࠬ࠹ࡦࠬ㍑ߢ23ᐕ⒟ᐲߢ᧼ෘ
ߩ 50%߹ߢㅴዷߔࠆߎߣ߇␜ߐࠇߚޕ߹ߚ㧘᳓⚛ᵈ㧔HWC㧕ߦࠃࠅᄢߦㅴዷ߇
ᛥߐࠇࠆߎߣ߇␜ߐࠇߚޕ㧔࿑ E-29㧕
H7⛮ᚻ(ࡦࠣࠅࠪࡦ࠳㧦ࠗࡦࠦࡀ࡞ṁធㇱ)ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇ ะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߢߪ㧘60 ᐕ⒟ᐲ⚻ㆊᓟߢ᧼
ෘߩ⚂5%⒟ᐲߒ߆ㅴዷߒߥߎߣ߇␜ߐࠇߚޕ㧔࿑E-30㧕
H7⛮ᚻ(ࡦࠣήߒṁធㇱࠪࡦ࠳)㧘߮ H7⛮ᚻ(ࡦࠣήߒṁធㇱਛᄩㇱ)ߢ ߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘60ᐕ⚻ㆊᓟߢ᧼ෘߩ8%⒟ᐲ ߒ߆ㅴዷߖߕ㧘ᄢߥㅴዷߪߒߥߎߣ߇␜ߐࠇߚޕ(࿑ E-31ޔ࿑ E-32)
H7⛮ᚻ(ࡦࠣήߒࠬ࠹ࡦࠬṁធᾲᓇ㗀ㇱ)ߢߪㆇォᤨ㑆⚂20ᐕߢ߈ⵚㅴዷ߇ ᄢߥჇടࠍ␜ߒ㧘⚂ 38ᐕߢ᧼ෘߩ50%߹ߢㅴዷߔࠆߎߣ߇␜ߐࠇߚޕ(࿑E-33)
ᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߢߪ㧘ૐ⚛ࠬ࠹ࡦࠬ㍑ߢㆇォᤨ㑆⚂15ᐕ߆ࠄᄢߦ ㅴዷ㊂߇Ⴧടߒ㧘⚂ 40 ᐕએ㒠✭߿߆ߦ⇐ߔࠆะߦࠆޕ߹ߚ㧘᳓⚛ᵈ(HWC) ߦࠃࠅᄢߦㅴዷ߇ᛥߐࠇࠆߎߣ߇␜ߐࠇߚޕ(࿑ E-35)
㧟㧚㧞 ో߈ⵚࠍߔࠆ╴ࡕ࠺࡞
H6⛮ᚻ㧔H6aࡦࠣ㧕ߢߪ㧘ᄖ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ႐ว㧘 ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߢߪ㧘ૐ⚛ࠬ࠹ࡦࠬ㍑ߪ⚂ 5 ᐕ⒟ᐲߢᄢߦ߈ⵚ ㅴዷ㊂߇Ⴧടߒ㧘20ᐕ⒟ᐲએ㒠✭߿߆ߦ⇐ะߦߥࠆߎߣ߇␜ߐࠇߚޕ߹ߚ㧘᳓⚛
ᵈ㧔HWC㧕ߦࠃࠅᄢߦㅴዷ߇ᛥߐࠇࠆߎߣ߇␜ߐࠇߚޕ㧔࿑ E-36㧕
H7⛮ᚻ㧔ࡦࠣࠅࡦࠣ㧕ߢߪ㧘ౝ㕙߆ࠄ߈ⵚ߇᧼ෘᣇะߦㅴዷࠍ㐿ᆎߒߚ ႐ว㧘ㅢᏱἹౝ᳓⾰ⅣႺਛ㧔NWC㧕ߢߪ㧘ૐ⚛ࠬ࠹ࡦࠬ㍑ߪ⚂ 7ᐕ⒟ᐲߢ߈ⵚㅴ ዷ㊂߇Ⴧടߒ㧘ߘߩᓟ߽✭߿߆ߦㅴዷߔࠆߎߣ߇␜ߐࠇߚޕ߹ߚ㧘᳓⚛ᵈ㧔HWC㧕 ߦࠃࠅᄢߦㅴዷ߇ᛥߐࠇࠆߎߣ߇␜ߐࠇߚޕ㧔࿑E-37㧕
㧔ෳ⠨ᢥ₂㧕
1)G.S.WanǧWeight Function Estimation of SIF for Mode I Part-Elliptical Crack under Arbitrary Load,̍Engineering Fracture Mechanics Vol.41, No.5, pp.659-684,(1992).
2)I.S.Raju and J.C.Newman Jr., NASA Technical Paper 1578(1979).
3)API Recommended Practice 579 First Edition,AppendixC,Jan.2000.
4)⊒㔚⸳ᛛⴚᬌᩏදળ㧘ޟࡊࡦ࠻㐳ኼൻᛛⴚ㐿⊒⺞ᩏႎ๔ᦠޠ㧔ᤘ 60ᐕᐲ㨪ᐔ
ᚑ8ᐕᐲ㧕.
᧼ෘ
H4㧘H7⢵㧘
H6a⢵ 㧦50.8mm H7ࠪࡦ࠳㧦70mm H6aࡦࠣ㧦75.8mm
500Ǵm
50Ǵm
ೋᦼ߈ⵚ㧔a/"=0.1㧕
㐳ߐ"
ᷓߐa