Development of ASTM standards for composites: An insider’s perspective

According to Dan Adams’ inside perspective, two elements determine whether a proposed test method for composite materials becomes an ASTM standard.


FASTIGUE: Empowering digital twins of large-scale composite structures

A 3D finite element technique to resolve the fidelity-versus-speed dilemma of performing fatigue analysis for large composite structures.


Flexure testing of sandwich composites

Dan Adams assesses the facesheet or core failures for three-point and four-points flexural loading configurations. 


The Single Cantilever Beam test for sandwich composites

After several years of research and development, the Single Cantilever Beam test method is in the process of standardization within ASTM's Committee D30 on Composites.


Estimating composite properties using data from similar materials

CW columnist Dan Adams explores methods for estimating composite mechanical properties using similar materials.

Carbon Fibers

The challenge of identifying test procedures for recycled carbon fiber composites

With growing use of recycled carbon fiber composites, the identification of mechanical testing procedures for rCF becomes increasingly important … and challenging.


Strain measurement in composites testing

Columnist Dan Adams explores the most important considerations and most common methods for strain measurement.


Mechanical testing of textile composites

Standardized mechanical testing methods abound, but they often focus on composites with unidirectional layers. Here are some modifications to common test methods for testing textile composites.


Measuring thermoplastic prepreg tape quality for part process control

Low-cost tests measuring dimensions, thermal behavior and consolidation predict CFRTP part quality.


Environmental testing of composites

Additional testing of polymer matrix composites (PMCs) is often performed in alternate environmental conditions to determine properties related to temperature and moisture sensitivity.


Design engineering of tailored preforms

Tailored preforming has opened new doors in composites fabrication, but designing for it requires tools that understand and work with this complex process.


Composite material testing: How do I know if my measured composite properties are correct, or even reasonable?

CW columnist Dan Adams explores methods for determining correctness of measured mechanical properties for fiber-reinforced composites.


Glass transition temperature testing of composites

The glass transition temperature of polymer matrix composites (PMCs) is determined by a series of tests at increasing temperatures.


Overcoming barriers to adoption of structural autocomposites

Although much attention has been focused on material costs and development of high-rate, automated manufacturing processes for structural autocomposites, production of viable products depends on the ability to design and simulate the structures for these exciting new FRP applications. 


Shear testing of high-shear strength composite laminates

CW columnist Dan Adams compares three V-notched shear test configurations used to measure the shear stiffness and shear strength of composite materials.


Fiber-optic sensors shed light on the toughest composite design challenges

Designers of composites are learning that if they are to be able to guarantee component and system performance, repeatability and reliability, it is critical that they have access to more sensor and test data.


Gripping composite test specimens: Options and guidance

Orthotropic behavior of composites test specimens makes load introduction uniquely challenging.


Application of video extensometry to ASTM D 5656

Reliable, reproducible data is central to the design and delivery of cost-effective bonded assemblies.


What’s the most important type of mechanical test for composites?

 When the opportunity arises, I like to ask those familiar with composites testing this question: What type of mechanical test do they consider to be the most important for composite materials?


Tackling the traceability of composite materials

Have you ever looked outside an airplane window during in-flight turbulence and wondered how strong the wings really are and how much load they can take?


Can flexure testing provide estimates of composite strength properties?

Flexure tests are simple to perform, yet the state of stress and failure modes are among the most complex.  


Software has a critical role in certification of composite designs for aerospace

Despite the many advantages that come with using composites materials in aerospace applications, designing weight-bearing structures from these materials remains a significant challenge.


Choosing composite material testing methods

An initial step in selecting suitable test methods involves consulting the available test literature. 


How ready are progressive damage analysis tools?

In the past 15 years, progressive damage analysis (PDA) for composites, implemented in finite element analysis software, has been under development.

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