ASTM D7291 Test Fixture
ASTM D7291– This test method determines the through-thickness “flatwise” tension strength and elastic modulus of fiber reinforced polymer matrix composite
materials.
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ASTM D7291 – Standard Test Method for Through-Thickness “Flatwise” Tensile Strength and Elastic Modulus of a Fiber-Reinforced Polymer Matrix Composite Material
ASTM D7291 – Through-Thickness “Flatwise” Tensile Strength and Elastic Modulus of a Fiber-Reinforced Polymer Matrix Composite Material
ASTM D7291– This test method determines the through-thickness “flatwise” tension strength and elastic modulus of fiber reinforced polymer matrix composite
materials.
A tensile force is applied normal to the plane of the composite laminate using adhesively bonded thick metal end-tabs.
The composite material forms are limited to continuous-fiber or discontinuous fiber (tape or 2-dimensional fabric, or both) reinforced composites.
The through-thickness strength results using this test method will in general not be comparable to Test Method D6415 since this method subjects a relatively large
volume of material to an almost uniform stress field while Test Method D6415 subjects a small volume of material to a non-uniform stress field.
Significance and Use
This test method is designed to produce through-thickness failure data for structural design and analysis, quality assurance, and research and development.
Factors that influence the through-thickness tensile strength, and should therefore be reported, include the following: material and fabric reinforcement,
methods of material and fabric preparation, methods of processing and specimen fabrication, specimen stacking sequence, specimen conditioning, environment
of testing, specimen alignment, speed of testing, time at temperature, void content, and volume reinforcement content
Referenced Documents
ASTM Standards
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D3171 Test Methods for Constituent Content of Composite Materials
D3878 Terminology for Composite Materials
D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials
D5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen Preparation
D6415 Test Method for Measuring the Curved Beam Strength of a Fiber-Reinforced Polymer-Matrix Composite
E4 Practices for Force Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E251 Test Methods for Performance Characteristics of Metallic Bonded Resistance Strain Gages
E456 Terminology Relating to Quality and Statistics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1012 Practice for Verification of Testing Frame and Specimen Alignment Under Tensile and Compressive Axial Force Application
E1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases
E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases
E1471 Guide for Identification of Fibers, Fillers, and Core Materials in Computerized Material Property Databases
*** Before conducting ASTM D7291 , it is important to read the entire specification in the relevant ASTM publication.
