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Technical Notes

ASTM B771-97 Standard Test Method for Short Rod Fracture Toughness of Cemeted Carbides
ASTM Designation: B771-87 (Reapproved 1997). Opens a new window for the ASTM site. You can purchase the B771-97 specification from the ASTM store. This test specification covers the determination of the fracture toughness of cemeted carbides by testing slotted short rod or short bar specimens.

Technical Note 501 A History of Plane-Strain Fracture Toughness Testing
Failures of structures due to brittle fracture under conditions of low stress have been recorded over the last two centuries. Since World War II, the use of high strength materials has increased significantly. The aviation industry in particular has demanded higher and higher strength-to-weight ratios, resulting in the development and application of very high strength materials. Unfortunately, many of these new high strength materials have little resistance to growth of cracks (fracture toughness). Thus, in some structures, the presence of small flaws resulted in failures of these high strength materials at stresses well below those for which the structure was designed. The occurrence of low stress fracture in high strength materials led to the study and development of Fracture Mechanics.

Technical Note 502 Measuring Plane-Strain Fracture Toughness Using Short Rod Specimens
ASTM standard test method E 1304, "Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials," significantly simplifies measurement of plane-strain fracture toughness. This test method was first proposed in 1976 and was accepted as an ASTM standard in 1989. This test method allows measurement of fracture toughness using smaller test specimens and simpler test procedures than previous fracture toughness tests. This Technical Note summarizes test procedures as outlined in E 1304.

Technical Note 503 Advantages of the Short Rod Test Method
ASTM standard test method E 1304, "Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials," commonly referred to as the Short Rod test method, offers some significant advantages in testing fracture toughness.

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