ICS-02: 3-Dimensional Analysis of Deformation of Disk Wheel and Bolt Shaft Right-Angled Force of Wheel Bolt(ICS-I: INTERFACES AND CONTACT SURFACE MECHANICS)

(1)

The Japan Society of Mechanical Engineers

NII-Electronic Library Service The JapanSociety of Mechanical Engineers

specimens,

for

futuretests

in

the University

diecasting

laboratoty.

CAS-05:

Mechanical

Properties

of

Heavy-Sectioned

Ferritic

Ductile

lron

and

lts

Relation

to

Microstructural

Features

Y. IVNLABUCHI,Kushire Natienal

_Coilege

of1lechnology;H,NARITIA,

O. TSUMURA.

The

Japan

Steet

Wbrks. Ltd,

E-mail:

lwaemech.kushiro-ct.ac.jp

Ductile

cast

iron

castings recently have exceeded 160 metric tons

in

shipping veight, since therehas been an

increesing

its

appl;cation to

heavycastings. IncTeasingthesizeof thecastingm results ;ndifficultyIn

ohraining

high

ductillty

and toughness.

This

_paper

described

the

fun-damental

study concerning with elongation and

fracture

toughness and

discussed

thematefiat data obtained from meck-up casks with 5oo mm

lnwaII thicknessmade of

ductlle

cast iron.The

fundamental

study was

carried out on microstructural featuressuch as pearlite

fract;on,

nodu-larityand nodule size, which _govempmechan;cal _propeniesand fracture

toughness of ductile cast iron,vsing the heavytest casting with 480 mrn

inwall thickness. Elongationincreaseswith decreasingpeerlitefraction

except

for

thecasting

having

1ow

nodufiarlty

indicating

Iittle

effecton it.

Elongation_{proportionally}increaseswith nedularity when lt exceeds 75%.

There is_geod reiation between $elldificatien time and nodulallty

indicat-ingthat nodularity of mere than 75% can beobtained when thecastings solidifywithin 2.5h.

Fracture

teughnessat ambient ternperature tends

to

be

improved with

increasing

nodule size.

Mock-up

casks, which have

2."2.5 m inouter diameter and 1,&2.5 m inheight,were manufactured

and a systematic eecamination was carried out testudy itspractical

uti-lization

ofductilecast iron.

All

mock-up casks exhiblt highermechanical

properties and fracturetoughness than aiming values.

CAS-06:

Study

on

the

Structure

and

Property

of

Pur;ty

Aluminum

Refined

with

Salt

Contain-ing

Ti

and

B

EIements

Z. HENGHUA,

T. XUAN.

S. GUANGjlE,

X

LUOPING,

Z. XIANNIAN,

D. HAILI,

L

MINMIN,

Shanghai

University.

E-mail:hhzhangQrnail.shu.edu.en

The macrostructure, micrastr"cture and propertyof purityaiuminum

rnfined with saltcontalning

Ti

and

B

elements

have

been

stutiied indetail with

Optical

Microscomf

and MTS(Mechanical

-festing

and

Simulatien).

It

isshown that thesalt containing weight ratie ef 22.2Ti:IB isthe

most effective refiner with the fineststructure and the

best

mechanicaf

properties,meanwhile ita[so possessesthe advantages of short reacting

time(within 5minutes)and longfadingtime{more than 20hours).

The

retining degreeincreaseswith the content of

Ti

and

B

inthe mebting.

Itisfoundfrom the analysis of OptlcalMicroscepbr,SEM-EDAX(Energy

DispersiveAnaEysisofX-Ray)andthermodynarnicsthattherefin;ngmech-anism ofsaltrefiners

is

mainiy contributed totheheterogencous nudei of

more fineTiA13_particlesdispersedinthe melting, which come from the

reactien

bmen

the saltanclaluminum.

While

(Al,

Ti)B2 haslittIeor

no relining effect.

but

boron

atem

has

also refining effect on the _purity aluminum when itlsadded simultaneously with titanium atom.

10:30

a.m.

-12:OO

neon

RoomC

ICS-I:

INTEREACES

AND

CONI:ACT

SURFACE

MECHANICS

ICS-Ol:

Frett;ng

Fatigue

Strength

and

Life

Es-timation

Considering

the

Fretting

Wear

Pro-cessT.

HMORI, M. YAMASHiTA, N.NISHIMURA,

Gifu

University,

email:

hattoriQec.glfu-u.acjp

MONDAY

MORNING,

June

20

lnth[spaperwe _presenttheestimatien methods of frettingwear _process

and frettingfatiguelifeusing thiswear preoess. Firstlythe fiettingwear

volume

(W)

was est;mated using contact pressure

(p),

relative slippage

(S)

and wear coefficient

(K)

as follows,W==KxpxS. And then the stress

intensityfactorforcracking due to fretting

fatigue

was calculated

by

us-ing contact _pressure

(p)

and frictienal stress

(q)

distributions, which were

anatyzed bythefinite element method.

The

SN

curves offrettingfatjgue

were predicted

by

using thereletienshTp

betM-een

thecalculated stress

ln-tensityfactor range

(AK)

with the threshoicl stress intensity

facter

range

(AKth)

and the crack _propagationrate

(daldN)

obtained using

CT

spec-imens of thematerlal.

Finaly

frettingfatiguetests werc conducted on

Ni-Cr-Mb-V steel spec;mens. The S-N curves of eur experimentai results

were in_good agreement with the analyticnl resultsohralned

by

consider-ingfrettingvvear

_process.

Uslngthese estimation methods we can explain

rnany

fretting

troubles

in

industrial

fields.

ICS-02:

3-Dimensional

Analysis

of

Deforma-tion

of

Disk

Wheel

and

Bolt

Shaft

R;ght-Angled

Force

of

Wheel

Bolt

T.KAGtVLLADA, H. HARADA, Hokka;do University,

E-mail:

kagiwadaQeng.hokud2i.ac.jp

Byleosening of the whee1 nut, which fixesthedisk whee1 crfautomobile

tothe wheel hub,theaccident that the whee1

fatls

away

in

running occurs sornetimes.

When

the

bolt

shaft righvangled foroeexceeds a certain

proponion ofthe

bolt

shaft

force,

thewheel nut beginstoleose.

Bes;des,

the boltshaft thrcemay atso be influenced

by

the Foadacting to the

wheel through the moment with the offSet ofthe wheei,

1fi

thisstucly,

3-dimensiona1deforrnationofthe

disk

wheei and thebolitshaft rlght-angled

force are clarified by3-d;mensionalnumericaL analysls. Itwas clear

from

the results thatthe bott shaft right-angledfhrce was lnftuenced

by

the

boltshaft fbrce caused

by

boltfasteningto besuperposed to that

by

the

lead,and greattyfluctuatedduring one revelution of the wheeJ. That can

beoome largefactor ef the leeseningof the wheel nut.

ICS-03:

Effects

of

Humidity

and

Contact

Mate-rial

on

Fretting

Fatigue

Behavior

of an

Extruded

AZ61

Magnesium

Alley

A.SAENGSAI, S.iSHINIVNLA,Y.

SAI"OH.

Y. MIYASHIM,

Y. MUTOH,

Nagaoka

Unlvresity

ef

lahnolegy,

E-mai):

MutehQmech.nageekaut.ac.jp

Frettingfatiguetests of the extruded

AZ61

magnesium allcy under

1ow

and highhumiditywere carried out toinvestigatebasicfrettingfatigue

characterist;cs and effect of humidlty on fretting

fatigue

behavior.

Effect

ofcontact mater]/alwas a[so investigated

by

using JISS45C carbon stee1

contact material. Degradation of fatiguestrength

due

tofretting was much more

significant

than that

due

to corrosion under high humidlty

condition. Therefbre,no effbet of humidityon

frening

fatig"e

strength

was 21so found. Reduction rate of

fatigue

strength due te frettingfor

magnesium a1Icy wes between those of a1uminurn a1ley and titan;urna11cy.

Tbngential

force

coofficient of magnesium ailcy was rather

1ow

compared to other materials such as steels, aluminum allcy and

titanium

allcy.

Frettingfatigue strength with

S45C

contact materlal was

1ower

thanthat

with the same contact material. Thisismainly due to highertangential

force

inMg/S45C centact. Frettingfatiguecracks at the

edge

of the

fretting contact region were ebserved to nucleate

in

thevery early stage

offatlgue1ife.whichisa1socommonlyknowninetherstructura1materi2ls.

ICS-04:

Joint

Forces

in

Riveting

of

PIates

H.

KIN05Hl-M,

K. KAiZU,

University

of

Miyazaki,

E-mail;

tOd165uQcc.miyazaki-u.acjp

Thispaper aims to clarifyguidelines

for

obtaining high

joint

strength

in

theriveting process.Itispresentlythought that inriveting theplate

is

fastened

_by

the r;vet head,as well as

by

pressure

between

therivetaxis

slde and theplateintherivet hcle as a result of the spreading ofthe

rivet

axls inthe riveting_process.fo research thefbrcethattheplateisfastened