 |
| |
|
|
FRACTURE TOUGHNESS
TENSILE CLEVISES
Clevises of all types and sizes can be designed and fabricated. A typical pair are shown in the above photograph, these conforming to ASTM Standard E 399 (Reference 1). This particular set was designed to test large (9" square, 0.50" thick) single-edge-notched compact tension steel specimens. Such clevises are typically fabricated of high strength, heat treated tool steel, per the ASTM standard. Heat treated 440C stainless steel can be used if the clevises are to be subjected to a hostile environment. Other clevis designs and special attachment fittings of all sizes and configurations are available, or can be designed and fabricated to meet the specific requirements of any application to metals, composites, plastics, or ceramics testing. A number of standards exist for these purposes. For example, Reference 2 is an applicable ASTM standard for testing plastics, while Reference 3 addresses polymer matrix composites. References 4 and 5 are additional ASTM standards for metals. Reference 6 addresses fatigue crack growth.
When testing
low strength materials such as plastics, clevises fabricated of
lower cost steels can often be used.
Sources of Additional Information: 1) 1) ASTM Standard E 399-90 (Reapproved 1997), "Plane-Strain Fracture Toughness of Metallic Materials," American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1970). 2) 2) ASTM Standard D 5045-99 (1999), "Plane-Strain Fracture Toughness and Strain Energy Release Rate of Plastic Materials,” American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1990). 3) 3) ASTM Standard E 1922-97 (1997), "Translaminar Fracture Toughness of Laminated Polymer Matrix Composite Materials,” American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1997). 4) 4) ASTM Standard E 1290-02 (2002), "Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement,” American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1989). 5) 5) ASTM Standard E 1820-01 (2001), "Measurement of Fracture Toughness,” American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1996). 6) 6) ASTM Standard E 647-00 (2000), "Measurement of Fatigue Crack Growth Rates,” American Society for Testing and Materials, West Conshohocken, Pennsylvania (first issued in 1978).
Top of Page | Home
Page | General Info | Company
Profile | Product Index Copyright 2005 - Wyoming Test Fixtures, Inc.
Wyoming Test Fixtures Inc. 2960 E. Millcreek Canyon Rd. Best experienced with |
