疲労のメカニズムと 疲労設計 - jsce.or.jp · PDF file疲労のメカニズムと 疲労設計 関西大学工学部 都市環境工学科 坂野昌弘 Email: [email protected]

Email: [email protected]

S-N

1 2 3

SS--N N

)log(1log)log( kk

mkk

Nm

C

CN

=

=

)log(1log)log( kk

mkk

Nm

C

CN

=

=

((logNlogN))

(( lo

glo

g ))

104 105 106 107 108 1091

10

100

1000

10000

N (cycle)

(N

/mm

2 )

A BC DE FG HH'

max

minR

=max

minR

=

R = -1.0

R = 0.0

FEMFEM

DDEE

EEFF

32 ,

4

1

4

1

32

or2

3

4

1

4231 4231 4

23

1

1

3

3

2

2

1

1

==

+++=

k

k

kk

k NnD

Nn

Nn

NnD

1

3

3

2

2

1

1

==

+++=

k

k

kk

k NnD

Nn

Nn

NnD

N

111n1n

1N1N2n2n

3n3n 2N2N

3N3N

22

33

CnC

nNnD

CNCN

mkkk

mk

kkk

k

k

mk

km

kk

==

==

)(1

CnC

nNnD

CNCN

mkkk

mk

kkk

k

k

mk

km

kk

==

==

)(1

( ) meqkkk

mkk

kk

mkkk

nn

nnn =

=

)()( ( ) meqkkk

mkk

kk

mkkk

nn

nnn =

=

)()(

meq

mm

mkkkm

kkkN

nn

=

=

)()( meq

mm

mkkkm

kkkN

nn

=

=

)()(

14

180

21

Point Pleasant 1967Mianus Riv. 1983199419911992Hoan2000JR20042005

100 LCC

OK

HH

()

OK

OK

OUTOUT

D

maxceCRCt

SS400,SM400,SM490Y,SM520,SMA400,SMA490,SMA490Y,SMA520

tRcemax CC tRcemax CC ce

RC

tC

ce ce

max max

log

Nlog

1

log

Nlog

YADTTn nSLiTi = 365 YADTTn nSLiTi = 365ADTTADTTSLiSLi:: i i ADTTADTT//nnLLLL

nnLLLLnn0.030.03

YY

2N1

n2N2

n1

01.NnD

i j,i

ti = 01.NnD

i j,i

ti =

m1

( )m

j,i

mtR

j,iCCCN

= 0( )

mj,i

mtR

j,iCCCN

= 0

LCC