Tiêu chuẩn iso 13061 13 2016

© ISO 2016 Physical and mechanical properties of wood — Test methods for small clear wood specimens — Part 13 Determination of radial and tangential shrinkage Propriétés physiques et mécaniques du boi[.]

Physical and mechanical properties of

Part 13:

Pro riétés p ysique s et méca iques du b is — Méth de s d’essais sur

petite s é ro vetes de b is sans déa t —

Partie 13: Déte mination des r traits radial et ta gentie l

Fir t edition

2 16-1 -1

Refer ence n mb r

ISO 1 061-1 :2 16(E)

COPYRIGHT PROTECTED DOCUMENT

© ISO 2016, P blshed in Sw itz rlan

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F reword i v

Introduction v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 Principle 1

5 A pparatus 1

6 Preparatio of test piec es 2

7 Proc ed re .2

7.1 Dete mination of the dimensions of tes pie es in g r een or fuly satur ated con ition 2

7.2 Dete mination of the dimensions of tes pie es at a solutely dry (o en-dry) con ition 2

8 Calculation and ex pr es io of r esults 3

9 Test rep r t 3

Biblog raphy 4

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific t erms an ex r s ions r lated to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www.iso.org/ iso/for word.html

The committ ee r sp nsible for thisdocument is ISO/TC2 8, Timbe

This firs edition of ISO 1 061-1 canc ls and r plac s ISO 446 :1 8 , w hich has be n t ech icaly

r vised with r g rds t o the siz s, mois ur cont ent of t es pie es an adjus ment for mois ur cont ent

A l s of al p rt in theISO 1 061se iescan be foun on the ISO websit e

The main purp se of this document is t o es a lsh the common int ernational p int of membe countries

of the Int ernational Org nization for Stan ardization (ISO), conc rning t es ing methods for smal clear

wo d spe imens an g ene al r q ir ment for determining phy sical an me hanical pro e ties of wo d

Physical and mechanical properties ofwood — Test

Part 13:

This document spe ifies a method for the det ermination of l near shrin ag e in the radial an tang ential

dir ctions of wo d

2 Normati ve r eferences

The folowing document ar r fe r d t o in the t ext in such a wa that some or al of their cont ent

cons itut es r q ir ment of this document F or dat ed r fe enc s, only the edition cit ed a ples F or

un at ed r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment ) a ples

ISO 3 2 , Wo d — S mpln meth ds a d gene al r q ir ment fr p ys ic al a d mecha ic al tes tin o

s mal clear wo d s pec imens

3 Terms and definitions

F or the purposes of this document, the t erms an def initions given in ISO 242 4 a ply

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— IECEle tro edia: a aia le at ht p:/ www.ele tro edia.org

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www.iso.org o p

4 Principle

The lnear shrinkag e is det ermined b measuring dimensions of a t es pie e in radial an tang ential

dir ctions of wo d befor and aft er drying t o a cons ant mas The lnear shrinkag e is calculat ed as

the chang e of the dimension in given dir ction ex r s ed as a pe c ntag e of the original dimension

The initial measur ment shal be taken on t es pie es in gr en or fuly saturat ed con ition The f inal

measur ment shal be taken on t es pie esin a solut ely dry (o en-dry) con ition

5.1 Me sur ing instr uments, ca a le of dete mining dimensions of the tes pie e to the near es

0,0 mm, fited with par alel flat en s each of diamete 5 mm to 8 mm, an a plying a clamping for ce

which wil not cause any deformation g r eate than the pr ecision of the ins rument

5.2 A for ced conve tion o en that can be maintained at a temper atur e of (1 3 ± 2) °C throughout the

drying chambe for the time r equir ed to dry the spe imen to the en p int shal be used T e o en shal

be vented to alow the ev p r ated moistur e to esca e

5.3 Desic cator, a v pour-tig ht containe with a sor bent mate ial (e.g si ca g el, calcium chloride, etc.)

to maintain the air dry

5.4 Ves el, containing distiled wate

5.5 Balanc e, ac urate to 0,00 g

6 Preparation oftest piec es

6.1 General

The sele tion, pr p ration an the minimum n mbe of t es pie es shal be in ac ordanc with ISO 3 2

6.2 Test piec es for deter mining radial and tang ential shrinkag e

Tes pie es shal be cut from wo d in gr en con ition Tes pie es shal be made in the form of

r ctangular prisms, with the siz of at leas 2 mm in radial an tang ential dir ctions an at leas 5mm

along the grain

6.3 Inclnation of annual r ing s of test piec es

The angle of inclnation of an ual rings t o a p ir of o p sit e radial fac s of the t es pie es shal not

ex ce d 1 °

6.4 Mar king of me surement p ints

Measur ment p int shal be marked at themid le of each surfac of t es pie e The c ntr p int shal

be marked on b th fac s of tang ential an radial surfac s for det ermining the dimension in radial an

tang ential dir ctions, r spe tively Dimensions of the t es pie es shal bemeasur d betwe n themarks

at each s ag e of mois ur con itions

7 Proc edure

7.1 Deter mination of the dimensions of test piec es in g reen or full y saturated c ondition

The mois ur cont ent of t es pie es shal be conside a ly highe than the f ibr saturation p int (FSP)

When the mois ur cont ent is below FSP, so k the t es pie es in dis i ed wat er at a t empe atur of

(2 ± 2) °C u ti no furthe chang e in dimensions oc urs Che k the chang es in dimensions eve y

3 d through r peat ed measur ment at the same p int u ti the dife enc betwe n two suc es ive

measur ment does not ex ce d 0,0 mm In this case, it shal be r port ed that the r sult ar o tained

on t es pie es w hich ha e be n pr viously so ked Measur the radial an tang ential dimensions, l

1

an l

t 1

, of each t es pie e t o an ac uracy of 0,0 mm

7.2 Deter mination of the dimensions of test piec es at absolutel y dr y (oven-dry)

c ondition

Aft er air-seasoning, the t es pie es shal be o en-pied an dried t o cons ant mas at a t empe atur

of (1 3 ± 2) °C in the o en, ensuring no che ks dist orting their dimensions an sha e oc ur Che k the

chang es in mas of two or thr e control t es pie es aft er 8 h of drying an r peat the measur ment

eve y 8 h or long er u ti the dife enc betwe n two suc es ive weighing does not ex ce d 0,2 % of the

t es pie es or w hen the dife enc betwe n two suc es ive measur ment does not ex ce d 0,0 mm

of the cor espon ing dimension of the t es pie e Tes pie es in w hich che ks oc ur ed d ring the t es

pe iod shal be disr g rded C ol the t es pie es t o ro m t empe atur in the desic at or Measur the

radial an tang ential dimensions, l

2

an l

2 , of each t es pie e t o an ac uracy of 0,0 mm

8 Calculation and ex pres ion ofresults

Calculat e the t otal lnear shrin ag e, β, as a pe c ntag e, b the folowing formulae:

a) for the radial dir ction:

β

r

r 1 r 2

r 1

=

−

×

l

b) for the tang ential dir ction:

β

t

t1 t2

t1

=

−

×

l

w he e

l

1

an l

t 1

ar the dimensions, in mi lmetr s, of the gr en or fuly saturat ed t es pie e, measur d

in the radial and tang ential dir ctions, r spe tively;

l

2

an l

2

ar the dimensions, in mi imetr s, ofthe tes pie e at a solutely dry (o en-dry) con ition,

measur d in theradial an tang ential dir ctions, r spe tively

Ex r s the r sult t o the near s 0,1 %

The mean an the s an ard deviation of the r sult o tained for the in ivid al t es pie es in a sample

shal be calculat ed t o an ac uracy of 0,1 %

9 Test r eport

The t es r p rt hal inclu e the fol owing information:

a) a r fe enc t o this document, i.e ISO 1 061-1 ;

b) thesampl ng detais in ac ordanc with ISO 3 2 ;

c) thedetai s pe taining t o measur ment of t es pie es;

d) thet es r sult and their s atis ical v lues calculat ed as spe if ied in Cla use 8;

e) thedat e w hen the t es wascar ied ou

f) thenameof theorg nization w hich car ied out the t es

Bibl og raphy

[1] ISO 242 4, Timbe — R ou d a d s aw n timbe — Voc ab lary

ICS  79.040

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