Test Specimen Machining at MVMTC

Thursday, January 22, 2015

Here at MVMTC, destructive physical analysis (DPA) is carried out to evaluate the physical characteristics of materials. These tests are generally less invasive than non-destructive testing and tend to offer more conclusive results in strength, ductility, hardness, composition or susceptibility to corrosion. Paired together, this information is also often used when doing failure analysis.

Each DPA test is done on a sample of material known as a test specimen, which is prepared in our machine shop. Our machinists prep each specimen to exacting dimensions and/or project dependent specifications.

Our Process
During the production of test specimens there are four typical processes performed: sawing, milling, turning and grinding. All specimens begin in the sawing phase, followed by one or more of the other three stages.

During the sawing process, specimens are rough-cut to spec based on the sample material or as stated in our detailed documentation. In general, sawing takes the sample and cuts it down to a workable size, close to that of the final specimen.

Turning is done on our lathe by rotating a part against a stationary cutting tool. Since rough-cut specimens are typically square in shape, this step becomes a requirement of all round specimens such as tensile and fatigue specimens. Turning can also reduce the gage length and allows us to thread the ends of a specimen when needed.

Milling is essentially the cutting away of material by feeding a specimen past a rotating cutter. The specimen surface can be flat, angular or curved and can be milled to a variety of shapes. Milling helps precision machine our tensile and hardness samples as well as further refine charpy specimens for grinding.

Grinding is the final step for most specimens. During grinding, a rotating abrasive wheel smoothes the surface to give the material a refined look or attain a desired finished.

Our Machine Shop
The machine shop at MVMTC prepares all types of test specimens. Our machinists are well versed in ASTM specifications and can create test samples for mechanical, corrosion or metallographic testing, just to name a few. Most of our specimens are machined from metal, metal composites, hardened steels and/or nickel alloys using our CNC capabilities.

Overall, our machine shop provides a convenient solution for our clients. These services are also provided for companies who perform their own in-house testing. For more information visit our website.

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