BS EN 4866 pdf free download

BS EN 4866-2021 pdf free download.Aerospace series – Definitions of imperfections and defects in organic matrix composite materials.
This document provides a list ofterms with their definitions illustrated by typical photographs, in order to define a common vocabulary on the imperfections and damage that may occur during the manufacture of organic matrix composite materials (which will be called “resin” in this document). Some types of damage may also be encountered in use.
This document is restricted to their definitions and does not give any acceptance criteria. The word “imperfection” will be preferred to the word “defect”, although the word “defect’ might be usually used. Defect acceptance criteria to be discussed between the user and customer and documented appropriately between the two parties.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• EEC Electropedia: available at https://www.electropedia.org/
3.1 General
3.1.1 damage
damage corresponds to degradation of the resin and/or the fibres caused by mechanical, thermal or environmental stresses
3.1.2 defect
imperfection or damage which exceeds the part acceptance criterion
3.1.3 imperfection
particularity encountered in composite materials that may result from the manufacturing process and/or the conditions of use
Note I to entry: Detection may be carried out visually or by using laboratory equipment.
3.1.4 indication
information given by non-destructive test means and which may correspond to an imperfection
3.2 Bonding imperfections See also EN ISO 10365.
3.2.1 absence of adhesive
absence of adhesive with respect to the part definition
Note 1 to entry: See Figure B.1.
3.2.2 absence of contact
presence of the required adhesive on one or both faces of the assembly, but with no contact
Note 1 to entry: Encountered in case of poor matching.
Note 2 to entry: See Figure B.2.
3.2.3 adhesive joint colour heterogeneity
possible imperfections when using two-component adhesives of different colours, and caused by incomplete mixing of the components (visible in particular in the adhesive bead)
3.2.4 adhesive rupture
total or partial separation of a bonding interface without rupture of neither the substrate nor the adhesive
Note 1 to entry: As opposed to cohesive rupture (characterized by a rupture within the substrate or the adhesive).
Note 2 to entry: See Figure B.3 and Figure B.4.
3.2.5 debonding
separation of two items as a result of adhesive or cohesive failure in the adhesive layer
3.2.6 excessive adhesive bead
localised adhesive surplus on the edge of a joint plane
3.2.7 insufficient adhesion
localised insufficient adhesion between two materials (substrate, adhesive, primer, etc.) characterised by insuffIcient mechanical strength of the interface
3.2.8 junction imperfection
incorrect positioning of one part with respect to the other during bonding.BS EN 4866 pdf download.