Standard Test Method for Dimensional Stability of Sandwich Core Materials
Standard Test Method for Dimensional Stability of Sandwich Core Materials
SIGNIFICANCE AND USE 5.1 Sandwich panel cores may change planar dimensions when heated. This phenomenon can be associated with the effects of heating upon the core material itself, as well as changes in core moisture content resulting from the heating cycle. It is prudent to know if this may be problematic with regard to the intended final part dimensions. 5.2 This test method provides a standard method of characterizing the dimensional stability of sandwich core materials for design properties, material specifications, research and development applications, and quality assurance. 5.3 Factors that influence dimensional stability of sandwich core materials and shall therefore be reported include the following: core material, methods of material fabrication, core geometry, core thickness, core thickness uniformity, cell wall thickness, specimen geometry, specimen preparation, heating and cooling environments (including temperatures and humidity levels), and specimen conditioning (both prior to and after heating). SCOPE 1.1 This test method covers the determination of the sandwich core dimensional stability in the two plan dimensions. 1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.2.1 Within the text, the inch-pound units are shown in brackets. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D6772/D6772M-22: Standard Test Method for Dimensional Stability of Sandwich Core Materials provides a uniform procedure to determine the dimensional stability of sandwich core materials, particularly when subjected to elevated temperatures. Sandwich panels, widely used in aerospace, automotive, marine, and construction industries, rely on core materials whose dimensional changes can impact end-product performance, quality, and longevity. This standard covers the evaluation of two planar dimensions, offering guidance for design validation, material specification, research and development, and quality assurance.
Scope of Testing
Significance and Use
Influencing Factors
Testing Requirements
Aerospace Structures Sandwich core materials are vital in lightweight aerospace panels. This standard ensures that these cores maintain dimensional stability during manufacturing and in service, reducing risks of part deformation or failure.
Другие стандарты ASTM
Automotive and Rail Used in lightweighting vehicles and interiors, dimensional stability testing helps manufacturers predict and control panel performance under temperature fluctuations.
Marine and Wind Energy For marine and wind turbine applications, understanding the dimensional response of core materials to moisture and heat cycles is essential for robust composite construction and durability.
Construction and Architecture Structural panels in building facades and roofing benefit from core materials that remain dimensionally stable, ensuring visual quality and structural performance over time.
Material Specification and Quality Control Provides data for selecting and certifying materials that meet end-use specifications, supports process improvement, and enhances traceability in manufacturing.
Keywords: sandwich core, dimensional stability, ASTM D6772, honeycomb cores, core material testing, temperature effect on materials, quality assurance, composite panels, thermal cycling, material specification.
By adhering to ASTM D6772/D6772M-22, manufacturers, designers, and quality engineers can ensure consistent performance and reliability of sandwich panels, mitigating risks of dimensional instability across various high-performance industries.