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Maintaining the state of the art
8 August 2025
AFMA now has the capability to create surface flaws for mechanical test specimens in house! We have successfully installed multiple flaws in tool steel using both copper and copper tungsten electrodes in a .005" by .010" flaw profile, and will soon be repeating the process on other alloys like Ti 6-1, Inconel 718, and 2024 T6 aluminum. Once complete, we will be seeking a sponsor for assistance in qualifying as a surface flaw supplier.
1 August 2025
Here are some close-up photos of a set of novel fixturing used for our 3 point bending fatigue specimen tests. The interesting feature about these fixtures is that a current can be run through both ends of the specimen and they will be able to read the resulting PD signal for crack length measurement. Results below show that the signal using this approach is very stable through the duration of the test.
7 July 2025
Check out the latest photo gallery of some of the equipment offered through AFMA, including the ADWin-X device enclosure with BNC connectors, cooling fan, heatsink, and Hyper-PD connectors, DCPD amplifiers, relays, and custom built cables for use with both the ADWin-X and ADWin Gold systems.
System and equipment pricing can be found on the FLcgs page here.
14 May 2025
On May 14th of this year, Keith presented the results of our work on the development of a unified low cycle fatigue design system for low-carbon Type 316 stainless steel. This model was based on previous research by Hamada and Nakajima, whose results formed the basis of the JSME design standard for AISI316LN and JJ-1 stainless steel at 4K. The AFMA model also uses test data from Commonwealth Fusion Systems at 77K and publicly available literature at room temperature.
LCF behavior of both Type 316LN and Inconel 718 were evaluated using Hartman and Glinka's approach of predicting fatigue behavior on the basis of monotonic material properties, specifically elastic modulus and Brinell hardness. Results of this evaluation were encouraging and suggest additional work and further development at other temperatures could make this method useful as a basis for preliminary design.
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