Fatigue testing may be performed at multiple points during the design of a composite structure. A focus on small-specimen level fatigue test methods, however, suggests a need for more testing method standardization.
A 3D finite element technique to resolve the fidelity-versus-speed dilemma of performing fatigue analysis for large composite structures.
Dan Adams assesses the facesheet or core failures for three-point and four-points flexural loading configurations.
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.
CW columnist Dan Adams explores methods for estimating composite mechanical properties using similar materials.
With growing use of recycled carbon fiber composites, the identification of mechanical testing procedures for rCF becomes increasingly important … and challenging.
Advanced CT-scan analyses can offer deep insight into challenges faced when examining novel composites and hybrid material behavior or performing quality and certification testing. Part two of a two-part series.
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.
Low-cost tests measuring dimensions, thermal behavior and consolidation predict CFRTP part quality.
Additional testing of polymer matrix composites (PMCs) is often performed in alternate environmental conditions to determine properties related to temperature and moisture sensitivity.
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.
The glass transition temperature of polymer matrix composites (PMCs) is determined by a series of tests at increasing temperatures.
Imaging and analysis via computed tomography (CT) has potential for certifiable safety and business sustainability and could be key for interior inspections of composite parts. Part 1 of a two-part series.
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.
CW columnist Dan Adams compares three V-notched shear test configurations used to measure the shear stiffness and shear strength of composite materials.
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.
Orthotropic behavior of composites test specimens makes load introduction uniquely challenging.
Reliable, reproducible data is central to the design and delivery of cost-effective bonded assemblies.
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?
According to Dan Adams’ inside perspective, two elements determine whether a proposed test method for composite materials becomes an ASTM standard.
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?
Flexure tests are simple to perform, yet the state of stress and failure modes are among the most complex.
Despite the many advantages that come with using composites materials in aerospace applications, designing weight-bearing structures from these materials remains a significant challenge.
An initial step in selecting suitable test methods involves consulting the available test literature.
In the past 15 years, progressive damage analysis (PDA) for composites, implemented in finite element analysis software, has been under development.
In my October 2015 column, I wrote an overview of the widely used V-notched shear test methods for composite materials. In this column, we focus on some additional best practices when performing V-notched shear testing of fiber-reinforced composites.