Composite testing challenges, Part 1: Introduction to mechanical testing of composites

A range of standardized mechanical tests for complex composites are available and still under development for materials development, design and quality control requirements. 


Durability testing of adhesively bonded composites

Current test method development shows potential for the composite wedge test, a standardized durability-based test for adhesively bonded composites. 

Fatigue testing of composites

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.

Part 2: Applying CT scan data analysis and visualization to composites

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. 
#design-and-testing #composites4_0

Applying CT scan data analysis and visualization to composites

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.
#design-and-testing #composites4_0

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.
#regulation #design-and-testing


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.
#composites4_0 #infrastructure #uas


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.
#design-and-testing #adhesives


Estimating composite properties using data from similar materials

CW columnist Dan Adams explores methods for estimating composite mechanical properties using similar materials.
#design-and-testing #generalaviation #sustainability

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.
#sustainability #airbus #bulkmoldingcompound


Strain measurement in composites testing

Columnist Dan Adams explores the most important considerations and most common methods for strain measurement.
#design-and-testing #sustainability


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.
#design-and-testing #weaving #braiding


Measuring thermoplastic prepreg tape quality for part process control

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


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-and-testing #sustainability #aramidfiber


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.
#weaving #ndi #outofautoclave


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.
#generalaviation #weaving #design-and-testing


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.
#sustainability #design-and-testing


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. 
#design-and-testing #adhesives


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.