Materials Testing

DYNAFLOW, INC. investigates materials resistance to erosion by cavitation and liquid and solid particle impact, material fatigue, and material behavior at high strain rates. Our capabilities enable:

Accelerated testing - compressing the effects of years of service life into hours of testing
Harsh Environment exposure

Recent Applications Include

Turbine blades
Artificial heart valves
Helicopter blades
Fuel pumps
Aircraft wings
Ship propellers
Radiators
Cavitationpeening
Fuel metering Valve

Cavitation Erosion Test

Cavitating Water Jets for conducting both ASTM G-134 and other test procedures.

Cavitating Water Jets offer the advantages of:

Rapid tests using jet facility
Easily adjustable erosive power
Accommodation of materials with widely differing erosion resistance
Economical obtainment of meaningful data
Broad range of test sample size and geometries
Controlled ambient pressure

Cavitating Jet Erosion Test of Stainless Steel.

High Frequency Vibratory Cavitation

High Frequency Vibratory Cavitation induces growth and collapse of cavitation bubble clouds by high frequency (14-20 kHz) oscillation of a sample immersed in a liquid.

ASTM G-32 and similar tests
Controlled ambient temperatures and a variety of liquids
Ultrasonic horns for conducting ASTM G-32 and similar test

Calibration of horn tip for the ultrasonic vibratory cavitation erosion test (ASTM G32)

Liquid Impact Erosion Test

Rotating Disk for studying the effects of multiple liquid drop impact

ASTM G-73 and similar test
Impact speed up to 750 ft/s
Simultaneous multiple sample testing
Sub atmospheric pressure testing
Controlled number of impacts and test duration

Rotating Disk for Liquid Impact.

Interrupted Water Jets

Interrupted Water Jets create impulsive impact pressures from a droplet stream

High speeds and frequencies
Great flexibility in sample size and geometry

Strobe Photo of High Velocity Interrupted Jet.

Fatigue Test

High Frequency via magnetostrictive device

Accelerated testing at 14-20 kHz
Rapid evaluation of materials subject to high cycle fatigue

Low Frequency

3-30 Hz flexure
Exposure to a salt water environment

Failed high Frequency Fatigue Test Sample.

High Strain Rate Properties

Split Hopkinson Pressure Bar measures properties at high loading rates which can differ by an order of magnitude from those for quasi static loading

Compressive and tensile stress-strain curves
Fracture
Strain rates in the thousands of in/in/sec

DYNAFLOW conducts a full range of research, development, and consulting studies on erosion, cavitation, and their effects on materials including analytical, numerical and experimental work. Numerical models are available for:

Cavitation bubble and bubble cloud dynamics and interaction with surrounding bodies
Fluid- structure interaction effects
The effects of stress wave propagation in multilayered media -e.g., coatings