ASTM C365 Flatwise Compressive Properties

Compressive Strength Testing of Sandwich Cores is done using the ASTM C365 test method. Both stabilized and unstabilized core materials with continuous or discontinuous bonding surfaces are tested flatwise. Ultimate strength, Deflection Stress, Failure mode, and Compressive Modulus are reported.

Talk to an Expert

ASTM C365 Flatwise Compressive Properties

TRUSTED BY

Precision-driven testing for dimensional accuracy and compliance

Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C365 defines a test method for determining the flatwise compressive properties of sandwich core materials such as honeycomb and foam cores. The test measures compressive strength and modulus when a load is applied perpendicular to the plane of the material.

This method is widely used in aerospace, marine, automotive, and composite industries. It helps evaluate the load-bearing capacity and structural performance of lightweight sandwich constructions.

Scope, Applications, and Benefits

Scope

ASTM C365 evaluates the compressive behavior of sandwich core materials under flatwise loading conditions. The test determines compressive strength, modulus, and deformation characteristics.

The test evaluates:

Flatwise compressive strength of core materials
Compressive modulus and stiffness
Load-bearing capacity under perpendicular loading
Deformation behavior under compression
Structural integrity of sandwich cores

Applications

Honeycomb core structures
Foam core composite panels
Aerospace and aircraft components
Marine and boat structures
Automotive lightweight panels
Structural sandwich constructions

Benefits

Provides accurate measurement of compressive properties
Supports the design of lightweight structural materials
Helps ensure the reliability of sandwich structures
Assists in material selection and optimization
Enables comparison of core materials

Test Process

Sample Preparation

Core specimens are cut to specified dimensions with parallel faces.

Specimen Mounting

Samples are placed between compression platens in a testing machine.

Load Application

Compressive load is applied perpendicular to the specimen surface at a controlled rate.

Data Recording & Evaluation

Load and deformation data are recorded to calculate compressive strength and modulus.

Technical Specifications

Parameter	Details
Applicable Materials	Honeycomb and foam core materials
Specimen Size	~50 mm × 50 mm (typical)
Thickness Range	~10 mm to 50 mm
Crosshead Speed	~0.5 mm/min to 5 mm/min
Load Range	Up to ~50 kN
Measured Outputs	Compressive strength (MPa), modulus (MPa)

Instrumentation Used for Testing

Universal testing machine
Compression platens
Displacement measurement system
Load cell
Sample cutting tools
Data acquisition system

Results and Deliverables

Flatwise compressive strength values
Compressive modulus results
Load vs. deformation data
Structural performance evaluation
Test condition summary
ASTM compliance report

Why Choose Infinita Lab for ASTM C365?

Infinita Lab offers comprehensive ASTM C365 testing services, a Comprehensive lab network, project management, confidentiality, and rapid turnaround. Trust Infinita Lab for your material testing needs, Faster test results, cost savings, and reduced administrative workload.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

Frequently Asked Questions

ASTM C365 includes compressive load, specimen thickness, loading rate, support conditions, and deformation measurement, evaluating flatwise compressive strength and modulus of sandwich core materials under controlled laboratory testing conditions.

ASTM C365 determines compressive strength, compressive modulus, and stress-strain behavior, providing data on resistance of core materials to crushing under perpendicular loading.

ASTM C365 is commonly applied to sandwich core materials such as honeycomb, foam cores, and composite cores used in aerospace, marine, and structural applications.

ASTM C365 requires a universal testing machine, compression platens, and displacement measurement systems to apply controlled compressive loads and record deformation.

ASTM C365 evaluates compressive behavior under controlled laboratory conditions and may not fully represent real-world conditions involving combined loading, environmental exposure, or long-term service effects on core materials.