Bsi bs en 02155 19 1997

BRITISH STANDARD AEROSPACE SERIES BS EN 2155 19 1997 Test methods for Transparent materials for aircraft glazing — Part 19 Determination of craze resistance The European Standard EN 2155 19 1996 has t[.]

Test m ethods for

The European Stand rd EN 2 5 -19:19 6 has the status of a

British Stand rd

ICS 4 0 5.9

This British Stan ard,ha ing

b en pre ared u der the

direction of the Eng inering

Sector Bo rd, was publshed

u der the authority of the

Stan ards Bo rd an comes

into efect on

1 Fe ruary 1 9

© BSI 1 -1 9

The folowing BSI references

relate to the work on this

stan ard:

Commite reference ACE/62

Draft for comment9 /71 1 5 DC

ISBN05 02 3 70

The prep ration of this British Stand rd was entrusted to Tech ical

Commit e ACE/62, Aerosp ce structural transp rencies and non-reinfor ed

plastic , upon which the folowing bodies were represented:

British Plastic Federation

Defence Resear h Ag ency

Society of British Aerosp ce Comp nies Limited

Am endm ents is ued sinc publ cation

Pag e

National foreword

This British Stand rd has be n prep red b Technical Commit e ACE/62and is

the Eng lish lang uag e v er ion of EN2 5 -19: 19 6 A er ospa ce s r ie — Te t

method s fr tr a nspa r ent ma ter ia ls f r a ir cr a ft gl a zing — Pa r t19: Deter mina tion

o cr a ze r esista nc publshed b the European Commit e for Stand rdization

( CEN)

EN2 5 -19 was produced as a result of international dis us ion in which the

United King dom to k an activ e p rt

A British Stand rd do s not purport to include al the neces ary prov isions of a

contract User of British Stand rds are responsible for their cor ect a pl cation

Com pl anc with a British Standard do s not of itselfc nfer im munity

f om leg al obl g ations

Summ ary of pag es

This document comprises a font cov er, an inside f ont cov er, p g es i and i,

theEN title p g e, p g es2 to4 and a b ck cov er

This stand rd has be n up ated ( se cop rig ht d te) and ma hav e ha

amendments incorporated This wi be indicated in the amendment ta le on

theinside font cov er

EUROPÄISCHE NORM

Aug ust1 96

ICS4 0 0.1

Des riptor : Air raft in ustry, glazing, translucent glas es,transp rent plastic,test, determination, c ack strength

Eng lish ver ion

for aircraft g lazing —

Série aérosp tiale — Méthodes d’es ais pour

matériaux transparents pour vitrag es

aéronautiques —

Partie1 : Détermination de la résistance au

fendi lement “c azing ”

Luft-und Raumfahrt — Prüfver ahren für

transp rente W erkstofe zur Verg lasung von

Luftg ahr eug en —

Tei 1 : Bestimmung der

Spannung srißb ständig keit

This European Stand rd was a prov ed b CEN on19 5-0 -13 CEN member

are bou d to comply with the CEN/ CENELEC Internal Reg ulations which

stipulate the conditions for g iv ing this European Stand rd the status of a

national stand rd without any alteration

Up-to-d te lsts and bibl og ra hical references concerning such national

stand rds ma be obtained on a plcation to the Central Sec etariat or to any

CEN member

This European Stand rd exists in thre oficial v er ions ( Eng lish, French,

German) A v er ion in any other lang uag e ma e b translation u der the

responsibi ity of a CEN member into its own lang uag e and notified to the

Central Sec etariat has the same status as the oficial v er ions

CEN member are the national stand rds bodies of Austria, Belg ium,

Denmark, Finland, France, Germany , Gre ce, I eland, I eland, Italy ,

Luxembourg , Netherlands, Norway , Portug al, Sp in,Sweden, Switz rland and

United King dom

European Commit e for Stand rdization

Comité Europé n de Normalsation

Europ is hes Komite für Normu g

Central Se retariat: rue de Stas art 3 , B- 10 0 Brus els

©19 6 Copy rig ht reserv ed to CEN member

Ref No EN2 5 -19:19 6 E

For word

This European Stand rd has be n prep red b the

European Association of Aerosp ce Man facturer

( AECMA)

After inquiries and v otes car ied out in ac ord nce

with the rules of this Association, this Stand rd has

receiv ed the a prov al of the National Associations

and the Oficial Serv ices of the member countries of

AECMA, prior to its presentation to CEN

This European Stand rd shal be g iv en the status of

a national stand rd, either b publ cation of an

identical text or b endor ement, at the latest b

February19 7, and conflcting national stand rds

shal be withdrawn at the latest b February19 7

According to the CEN/CENELEC Internal

Reg ulations, the national stand rds org anizations

of the folowing cou tries are bou d to implement

this European Stand rd: Austria, Belg ium,

Denmark, Finland, France, Germany , Gre ce,

I eland, I eland, Italy , Luxembourg , Netherlands,

Norway , Portug al, Sp in,Sweden, Switz rland and

the United King dom

Contents

Pag e

Fig ure 1 — Loa ing condition for flat she t 3

1 Scope

This stand rd specifies the test method to

determine the resistance of transp rent she t to the

efect of a solv ent env ironment whie subjected to a

loa No method has be n dev eloped y et for

specimens with a thick es <6mm; for such

material, a test method shal be ag re d betwe n the

man facturer and the pur haser

2 Definition

For the purposes of this stand rd, the folowing

definition a pl es:

The c az resistance is defined as the a sence of

c azing ( mic o-c acks) when prop nol 2 ( isopropy l

alcohol is a pl ed u der control ed conditions for a

period of3 min to the sur ace of a specimen

ex eriencing a fibre stres as stated in the material

stand rd

3 Apparatus and m aterials

3.1 A canti ev er loa ing ar ang ement as shown

inFigure 1

3.2 Suita le mas es to be h ng f om the loa ing

point to induce the required stres

3.3 Prop nol 2 ( isopropy l alcohol of analy tical

qual ty

3.4 Fi ter p per

4 Specim ens

4.1 The specimens shal be cut fom a she t and

shal hav e a hig h polsh and be fe fom sur ace

d mag e

4.2 Specimens shal be cut of

dimensions17 mm× ( 25±1)mm × ( 6±0,5)mm;

the cut edg es shal be machined smo th Material

with a thick es >6mm shal be machined on one

face only to6mm thick es and the non-machined

face shal be tested

4.3 A hole of6mm diameter shal be dri ed with its

centre15mm fom one end and on the centre lne of

the specimen to faci itate loa ing ( se Fig ure 1)

Fig ure 1 — Loa ing c ndition for flat she t

5 Conditioning

5.1 The specimens shal be conditioned

at( 23±2)°C, ( 50±5)% relativ e h midity for at

least4 h prior to testing u der the same

conditions

5.2 The a p ratus and solv ent ( in a suita ly

stop ered container) shal be pre-conditioned as for

the specimens

6 Procedur

6.1 For u stretched material the test specimens

shal be fe ly suspended in an air-cir ulating ov en

and maintained at a temperature of ( 15 ±2)°C for

a period of3 min After al owing to co l to ro m

temperature u der draug ht-f e conditions the

specimens are an ealed in an air-cir ulating ov en to

the man facturer’s instructions, then al owed to

co l to ro m temperature u der draug ht-f e

conditions After an eal ng and co l ng the width

and thick es shal be measured at the position of

the fulc um with an ac uracy of ±0,02 mm

6.2 For stretched ac y lic material the test

specimens shal be f e ly suspended in an

air-cir ulating ov en and maintained at a

temperature of ( 75±2)°C for a period of16h and

then al owed to co l u der draug ht-f e conditions

Prior to testing the width and thick es shal be

measured at the position of the fulc um with an

ac uracy of ±0,02 mm

6.3 The specimens shal be set up as cantiev er

beams and loa ed with the specified outer fibre

stres which is calculated f om the folowing

formula

where:

6.4 After a pl cation of the loa for10min and

whie sti u der loa ,prop nol 2 ( isopropy l alcohol

shal be a pled to each specimen b means of

a20mm× 20mm fi ter p per p tch placed on the

up er sur ace and centered on the fulc um and kept

wet with the solv ent

6.5 The fiter p per p tch shal be remov ed

after3 min and the specimen ex mined for

ev idence of c azing

6.6 There shal be no c azing ( g roup of c acks) on the

tested surace Indiv idual c acks shal be

dis eg arded

Unles the c acks are ov er3mm in leng th, edg e

c azing shal be dis eg arded

7 Test r port

The test report shal include the folowing :

— n mber of this stand rd;

— material ty pe;

— b tch n mber;

— stres a pled;

— a pearance of specimen after test;

— compl ance/non-compl ance with the

requirements of6.6

s is the outer fibre stres , in meg ap s als;

B is the specimen width measured, in

mi imetres;

A is the specimen thick es measured, in

mi imetres;

L is the distance f om the fulc um point to the

loa a pl cation point, in mi imetres

measured to the nearest0,1 mm

loa ( newtons)

s B A 2

6 L

=

B S I

3 8 9Chis wic kHighRoa

L ndo

W44AL

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