Made to Order: Custom Machined Test Specimens
When you require precision test specimens for destructive testing, Laboratory Testing Inc. can fill the order quickly and economically. For quick turnaround on orders, the Machine Shop at LTI can handle all specimen machining for destructive testing including the full spectrum of mechanical test specimens, rough cutting and grinding for metallography specimens and chips for ICP analysis.
We use computerized numerical control (CNC) equipment to prepare the highest quality test specimens and coupons from metals including metal matrix composites, hardened steels, nickel-base alloys, and many plastics. Electrical discharge machining (EDM) services are also available.
Our specimen machining, also called sample machining, is performed according to ASTM standards A370, E8, E23 and customer specifications. LTI is PRI/Nadcap accredited for specimen preparation and is on NIST’s (National Institute of Standards and Technology) Qualified Manufacturers List for Charpy V-notch Impact verification specimens.
Our wide-range of test specimens include the following:
- Flat Tensile
- Round Tensile
- Flat Fatigue
- Izod Impact
- Dynamic Tear
- Stress Rupture
- Stress Corrosion
- Charpy V-Notch Impact
- Compact Tension
- Fracture Toughness
- Round Compression
- Hydrogen Embrittlement
- Face, Root, & Side Bend
- Rotating Beam & Low Cycle Fatigue
- Frequency Severity (Steel Cleanliness)
The Specimen Machining Process
The machining of most test specimens begins with the rough cutting of material to length on a saw. The specific type of specimen required, including shape and features, will dictate whether milling, turning and grinding are also part of the sample machining process. Round specimens require turning on a lathe, since rough-cut specimens are usually square in shape. Milling cuts away material to create flat, angular, curved or a combination of surfaces on the specimen. Grinding is the final step for some specimens that require more refining or a specific finish.
- Capabilities – all test specimens required for destructive testing at LTI
- Materials – metals and many plastics
- Accreditations/Approvals – PRI/Nadcap accredited; NIST’s Qualified Manufacturers List for Charpy V-notch Impact verification specimens
- ASTM A370
- ASTM E8
- ASTM E23