ASTM E1556-08

Standard Specification for Epoxy Resin System for Composite Skin, Honeycomb Sandwich Panel Repair

ABSTRACT
This specification covers the requirements for an epoxy resin system intended for the repair of sandwich panels for durable, rigidwall, relocatable structures. It must be usable in a field environment and shall not require the use of special equipment such as autoclaves or presses. The epoxy system covered by this specification shall be usable for simultaneous impregnation of a wet-layup composite skin and bonding of that skin to a substrate honeycomb core. The inspection and testing of the epoxy system shall be classified as qualification tests and quality conformance tests. The following test methods shall be performed to conform to the requirements specified: tensile lap shear strength; apparent horizontal shear strength; and flatwise tensile strength.
SIGNIFICANCE AND USE
Epoxy resin systems used in the repair of composite skin sandwich panels for durable, rigidwall, relocatable shelters must have a combination of mechanical property levels and environmental resistance that will assure long-term durability of the skins and the skin-to-core adhesive bonds when exposed to severe climatic exposures. In addition, these epoxy materials must have processability characteristics that permit their use in a variety of repair scenarios and environments.
Intended Use—Epoxy systems conforming to this specification are intended for use in the repair of honeycomb panels at the maintenance field level. The material is intended for use with SAE-AMS-C-9084 glass cloth.
This is a procurement control document for the procurement of the epoxy system and designers shall be aware that the test values specified herein are based upon tests performed with specific glass-resin composite adherends and shall not be used for design data.
Epoxy systems covered by this specification are not intended for use in production bonding of sandwich construction.
SCOPE
1.1 This specification covers the requirements for an epoxy resin system intended for the repair of sandwich panels for durable, rigidwall, relocatable structures. It must be usable in a field environment and shall not require the use of special equipment such as autoclaves or presses. The epoxy system covered by this specification shall be usable for simultaneous impregnation of a wet-layup composite skin and bonding of that skin to a substrate honeycomb core. The material shall withstand exposure to temperatures from −54 to 93°C (−65 to 199°F) and high relative humidity, and also the combination of stress, temperature, and relative humidity that are expected to be encountered in service.
1.2 The values stated in SI units are to be regarded as standard where only SI units are given or where SI units are given first followed by inch-pound units; where inch-pound units are given first followed by SI units, the inch-pound units are to be regarded as the standard.
1.3 The following safety hazards caveat refers only to the test methods described in this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Oct-2008
• ICS: 83.140.20 - Laminated sheets
• Technical Committee: E06 - Performance of Buildings
• Drafting Committee: E06.53 - Materials and Processes for Durable Rigidwall Relocatable Structures

Relations

• Replaces: ASTM E1556-03 - Standard Specification for Epoxy Resin System for Composite Skin, Honeycomb Sandwich Panel Repair
• Effective Date: 01-Nov-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1556 −08
StandardSpecification for
Epoxy Resin System for Composite Skin, Honeycomb
1
Sandwich Panel Repair
This standard is issued under the fixed designation E1556; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D792Test Methods for Density and Specific Gravity (Rela-
tive Density) of Plastics by Displacement
1.1 This specification covers the requirements for an epoxy
D2344/D2344MTest Method for Short-Beam Strength of
resin system intended for the repair of sandwich panels for
PolymerMatrixCompositeMaterialsandTheirLaminates
durable,rigidwall,relocatablestructures.Itmustbeusableina
D2584Test Method for Ignition Loss of Cured Reinforced
field environment and shall not require the use of special
Resins
equipment such as autoclaves or presses. The epoxy system
D2734TestMethodsforVoidContentofReinforcedPlastics
covered by this specification shall be usable for simultaneous
E874Practice for Adhesive Bonding of Aluminum Facings
impregnation of a wet-layup composite skin and bonding of
to Nonmetallic Honeycomb Core for Shelter Panels
that skin to a substrate honeycomb core. The material shall
D3165Test Method for Strength Properties of Adhesives in
withstand exposure to temperatures from −54 to 93°C (−65 to
Shear by Tension Loading of Single-Lap-Joint Laminated
199°F)andhighrelativehumidity,andalsothecombinationof
Assemblies
stress, temperature, and relative humidity that are expected to
E1091Specification for Nonmetallic Honeycomb Core for
be encountered in service.
Use in Shelter Panels
1.2 The values stated in SI units are to be regarded as
3
2.2 Military Specifications:
standard where only SI units are given or where SI units are
MIL-I-24768Insulation, Plastic, Laminated, Thermosetting,
given first followed by inch-pound units; where inch-pound
Glass-Cloth, Epoxy-Resin
units are given first followed by SI units, the inch-pound units
3
2.3 Military Standards:
are to be regarded as the standard.
MIL-STD-129Military Marking for Shipping and Storage
1.3 The following safety hazards caveat refers only to the
MIL-STD-1916DOD Preferred Methods for Acceptance of
testmethodsdescribedinthisspecification. This standard does
Product
not purport to address all of the safety concerns, if any,
4
2.4 Commercial Standards:
associated with its use. It is the responsibility of the user of this
SAE-AMS-C-9084Cloth, Glass, Finished for Epoxy Resin
standard to establish appropriate safety and health practices
Laminates
and determine the applicability of regulatory limitations prior
to use.
3. Physical Requirements
3.1 Working Characteristics:
2. Referenced Documents
3.1.1 Application—Thecomponentsoftheepoxyresinshall
2
2.1 ASTM Standards:
be readily hand-mixed to a smooth consistency suitable for
C297/C297MTest Method for Flatwise Tensile Strength of
application. It shall be uniform and free of lumps. The resin
Sandwich Constructions
components, once mixed, shall not settle out. The epoxy
material shall be suitable for the wet-layup impregnation of
SAE-AMS-C-9084 glass cloth and for application to core
1
This specification is under the jurisdiction of ASTM Committee E06 on
materials over the temperature range of 16 to 38°C (60 to
Performance of Buildings and is the direct responsibility of Subcommittee E06.53
100°F) and at relative humidities of 30 to 75%.
on Materials and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved Nov. 1, 2008. Published December 2008. Originally
approved in 1993. Last previous edition approved in 2003 as E1556–03. DOI:
3
10.1520/E1556-08. Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM www.dodssp.daps.mil.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Society of Automotive Engineers (SAE), 400 Commonwealth
the ASTM website. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E1556−08
TABLE 1 Property Requirements for 24-h, 23°C Cure
A
Number of Average Must Exceed Minimum Must Exceed,
Property Test Condition
Specimens MPa (psi) MPa (psi)
Tensile Lap Shear Strength in accordance 23°C (73°F), dry 5 6.9 (1000) 5.85 (850)
wit
...

This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E1556–03 Designation: E 1556 – 08
Standard Specification for
Epoxy Resin System for Composite Skin, Honeycomb
1
Sandwich Panel Repair
This standard is issued under the fixed designation E1556; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope
1.1 Thisspecificationcoverstherequirementsforanepoxyresinsystemintendedfortherepairofsandwichpanelsfordurable,
rigidwall, relocatable structures. It must be usable in a field environment and shall not require the use of special equipment such
as autoclaves or presses. The epoxy system covered by this specification shall be usable for simultaneous impregnation of a
wet-layup composite skin and bonding of that skin to a substrate honeycomb core. The material shall withstand exposure to
temperatures from −54 to 93°C (−65 to 199°F) and high relative humidity, and also the combination of stress, temperature, and
relative humidity that are expected to be encountered in service.
1.2 The values stated in SI units are to be regarded as standard where only SI units are given or where SI units are given first
followedbyinch-poundunits;whereinch-poundunitsaregivenfirstfollowedbySIunits,theinch-poundunitsaretoberegarded
as the standard.
1.3 The following safety hazards caveat refers only to the test methods described in this specification. This standard does not
purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to
establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C297297/C297M Test Method for Flatwise Tensile Strength of Sandwich Constructions
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D2344Test Method for Strength of Polymer Matrix Composite Materials by Short-Beam Method 2344/D2344M Test Method
for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates
D2584 Test Method for Ignition Loss of Cured Reinforced Resins
D2734 Test Methods for Void Content of Reinforced Plastics
E874 Practice for Adhesive Bonding of Aluminum Facings to Nonmetallic Honeycomb Core for Shelter Panels
D3165 Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated
Assemblies
E874Practice for Adhesive Bonding of Aluminum Facings to Nonmetallic Honeycomb Core for Shelter Panels
E1091 Specification for Nonmetallic Honeycomb Core for Use in Shelter Panels
3
2.2 Military Specifications:
MIL-I-24768 Insulation, Plastic, Laminated, Thermosetting, Glass-Cloth, Epoxy-Resin
3
2.3 Military Standards: Military Standards:
MIL-STD-129 Military Marking for Shipping and Storage
MIL-STD-1916 DOD Preferred Methods for Acceptance of Product
4
2.4 Commercial Standards Commercial Standards:
SAE-AMS-C-9084 Cloth, Glass, Finished for Epoxy Resin Laminates
1
This specification is under the jurisdiction ofASTM Committee E06 on Performance of Buildings and is the direct responsibility of Subcommittee E06.53 on Materials
and Processes for Durable Rigidwall Relocatable Structures.
Current edition approved Oct. 1, 2003. Published October 2003. Originally approved in 1993. Last previous edition appoved in 1998 as E1556–98.
Current edition approved Nov. 1, 2008. Published December 2008. Originally approved in 1993. Last previous edition approved in 2003 as E1556–03.
2
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
2
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,[e-mail] Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://www.dodssp.daps.mil.
4
Normal failure modes are debonding along the core-skin interface or core tearing but other failure modes may be encountered.
Copyright © ASTM International, 100 Barr Har
...