Nondestructive tests as an aid to fracture prevention mechanics

✍ Scribed by C.H. Hastings

• Book ID: 103084921
• Publisher: Elsevier Science
• Year: 1970
• Tongue: English
• Weight: 703 KB
• Volume: 290
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/0016-0032(70)90240-1

✦ Synopsis

Meaningful analysis of product strain data or defect allowables requires know- ledge of material macrodefects and property gradients . This knowledge can be supplied by nondestructive tests during design studies involving brittle materials .

An NDT technology, capable of supporting this extension is rapidly developing, parallel with improvements in stress analysis techniques . The nondestructive, quantitative evaluation of material properties in discrete local volumes of materials and products makes knowledge of properties variability gradients available for more precise, nonstatistical analysis of thermorneehanical stress behavior. Even in "defect free" material, failures may be initiated at sites of property--stress gradients . Recent advances, in NDT determination of mechanical properties are reviewed .

Notation

A ratio of Es to El, (dimensionless constant) ED dynamic modulus (lb/in') F,y , secant modulus (lb/in s , ) Er tensile modulus (lb/in 2 ) K constant to adjust units UTS ultimate tensile strength (lb/in 2 )

Vy ultrasonic pulse velocity (in ./psec) s z, total strain to failure (in ./in .) p density (g/cm°)