EN 6037:2015

Aerospace series - Fibre reinforced plastics - Test method - Determination of bearing strength

This European Standard defines the procedure to be used to determine the bearing strength of fibre composites with multidirectional reinforcement. This standard is applicable to composite laminates manufactured from unidirectional tape or woven fabric reinforcement.
This standard does not give any directions necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safety precautions.

Luft- und Raumfahrt - Faserverstärkte Kunststoffe - Prüfverfahren - Bestimmung der Lochleibungsfestigkeit

Série aérospatiale - Matières plastiques renforcées de fibres - Méthode d'essai - Détermination de la résistance au matage

Aeronavtika - Z vlakni ojačeni polimerni materiali - Preskusna metoda - Ugotavljanje nosilne trdnosti

Ta evropski standard določa postopek, ki se uporablja za ugotavljanje nosilne trdnosti vlaknatih kompozitov z večsmerno ojačitvijo. Ta standard se uporablja za kompozitne laminate, proizvedene iz enosmernega traku ali z vlakni ojačenih materialov.
Ta standard ne vsebuje nobenih smernic, potrebnih za izpolnjevanje zdravstvenih in varnostnih zahtev. Uporabnik tega standarda se mora posvetovati in določiti ustrezne zdravstvene in varnostne ukrepe.

General Information

• Status: Published
• Publication Date: 24-Nov-2015
• Withdrawal Date: 30-May-2016
• ICS: 49.025.40 - Rubber and plastics
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Nov-2015
• Completion Date: 25-Nov-2015
• Ref Project: SIST EN 6037:2016 - Aerospace series - Fibre reinforced plastics - Test method - Determination of bearing strength

Overview - EN 6037:2015 (Aerospace series)

EN 6037:2015 defines a standardized test method to determine the bearing strength of fibre reinforced plastics (FRP) used in aerospace applications. It applies to multidirectional composite laminates manufactured from unidirectional tape or woven fabric reinforcement. The method measures both yield bearing strength (defined by a 0.02 × diameter permanent hole set) and ultimate bearing strength under a bolted tensile load, and specifies specimen preparation, test apparatus, conditioning and reporting requirements.

Key topics and technical requirements

• Test principle: Tensile loading of a flat laminate with a bolt through a hole; bearing failure is targeted by using a large specimen width.
• Yield and ultimate definitions: Yield corresponds to 2% permanent hole deformation; ultimate is the maximum load. Bearing stresses are calculated as p = P / (d · t) where d is nominal pin diameter and t is laminate thickness.
• Specimen preparation: Laminate production and specimen machining referenced to EN 2565 (carbon) and EN 2374 (glass). Typical specimen sizes and hole diameter (nominal d = 6.35 mm) are provided.
• Apparatus and test conditions:
  • Tensile machine with 1 % accuracy and load–elongation recording.
  • Extensometer (recommended 50 mm gauge).
  • Temperature chamber (±3 °C control) for elevated/sub-zero tests.
  • Cross-head speed specified at 1 mm/min and defined loading sequence (load to estimated yield, unload to ~10–20 %, then reload to failure).
• Conditioning and ageing: Ambient conditioning per EN 2743 (23 ±2 °C, 50 ±5 % RH) and humid-ageing per EN 2823. Aged specimens must be tested promptly after exposure.
• Sampling and reporting: Minimum six specimens per condition; test report must include material ID, lay-up, specimen dimensions, test parameters, individual results, mean and standard deviation, load-elongation curves and observed failure modes.

Applications and who uses EN 6037:2015

• Aerospace materials engineers and structural analysts evaluating bearing performance of bolted joints in composite airframe components.
• Test laboratories and OEM suppliers qualifying composite laminates, fastener designs and repair techniques.
• Certification bodies and procurement teams requiring repeatable, comparable bearing-strength data for design allowables, joint sizing and durability assessments.
• Research organizations studying temperature and moisture effects on composite joint performance.

Related standards

• EN 2374 - production of glass-fibre test panels
• EN 2565 - preparation of carbon fibre resin panels
• EN 2743 - conditioning prior to testing unaged materials
• EN 2823 - effects of humid atmosphere on properties

EN 6037:2015 is essential for consistent measurement of composite bearing strength in aerospace design, testing and qualification workflows. Keywords: EN 6037:2015, bearing strength, fibre reinforced plastics, aerospace, composite laminates, test method.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2016
$HURQDYWLND=YODNQLRMDþHQLSROLPHUQLPDWHULDOL3UHVNXVQDPHWRGD
8JRWDYOMDQMHQRVLOQHWUGQRVWL
Aerospace series - Fibre reinforced plastics - Test method - Determination of bearing
strength
Luft- und Raumfahrt - Faserverstarkte Kunststoffe - Prufverfahren - Bestimmung der
Lochleibungsfestigkeit
Série aérospatiale - Matieres plastiques renforcaes de fibres - Methode d'essai -
Determination de la resistance au matage
Ta slovenski standard je istoveten z: EN 6037:2015
ICS:
49.025.40 Guma in polimerni materiali Rubber and plastics
83.120 2MDþDQLSROLPHUL Reinforced plastics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 6037
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2015
EUROPÄISCHE NORM
ICS 49.025.40
English Version
Aerospace series - Fibre reinforced plastics - Test method -
Determination of bearing strength
Série aérospatiale - Matières plastiques renforcées de Luft- und Raumfahrt - Faserverstarkte Kunststoffe -
fibres - Méthode d'essai - Détermination de la Prufverfahren - Bestimmung der
résistance au matage Lochleibungsfestigkeit
This European Standard was approved by CEN on 28 June 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 6037:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle of the method . 5
5 Designation of the method . 5
6 Apparatus . 5
7 Test specimen . 5
8 Procedure. 6
9 Presentation of the results . 7
10 Test report . 8

European foreword
This document (EN 6037:2015) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2016, and conflicting national standards shall be
withdrawn at the latest by May 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
1 Scope
This European Standard defines the procedure to be used to determine the bearing strength of fibre
composites with multidirectional reinforcement. This standard is applicable to composite laminates
manufactured from unidirectional tape or woven fabric reinforcement.
This standard does not give any directions necessary to meet health and safety requirements. It is the
responsibility of the user of this standard to consult and establish appropriate health and safety
precautions.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 2374, Aerospace series — Glass fibre reinforced mouldings and sandwich composites — Production of
test panels
1)
EN 2565, Aerospace series — Preparation of carbon fibre reinforced resin panels for test purposes
EN 2743, Aerospace series — Fibre reinforced plastics — Standard procedures for conditioning prior to
testing unaged materials
EN 2823, Aerospace series — Fibre reinforced plastics — Test method for the determination of the effect of
1)
exposure to humid atmosphere on physical and mechanical characteristics
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
bearing stress at a given moment during the test
load experienced by the test specimen at a particular moment divided by the nominal bolt-diameter and
the specimen thickness
3.2
yield bearing strength
bearing stress which results in a 0,02 times the diameter permanent set of the joint
3.3
ultimate bearing strength
bearing stress at the maximum load during the test (see Figure 1)

1) Published as ASD-STAN Prestandard at the date of publication of this standard. http://www.asd-stan.org/
4 Principle of the method
A tensile test is carried out on a flat laminate containing a hole; the load is applied by a bolt passing
through the hole. A large specimen width is chosen, so that bearing failure occurs. The yield and ultimate
bearing strengths are determined.
5 Designation of the method
The designation of the used method shall be drawn up according to the following example:
Description block Identity block

Fibre reinforced plastics
EN6037A1
Determination of bearing strength

Number of this standard
Laminate configuration (see Figure 8)

Specimen type (see Figure 8)
NOTE If necessary, the code I9005 shall be placed between the description block and the identity block.
6 Apparatus
6.1 Tensile testing machine, calibrated to maintain a load and displacement accuracy in tension within
1 %. There shall be the capability to record lo
...