Characterization and measurement of the mode 1 dynamic initiation of cracks in metals at intermediate strain rates—A review

✍ Scribed by R.A.W. Mines

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 905 KB
• Volume: 9
• Category: Article
• ISSN: 0734-743X
• DOI: 10.1016/0734-743x(90)90034-s

✦ Synopsis

Dynamic initiation of cracks in metals occurs as a result of impact loading. In general, for the case of small scale yielding, the fracture toughness of the material reduces with elevated strain rate, whereas for large scale yielding fracture toughness increases with strain rate. The review concentrates on the modelling of the crack tip stress field at intermediate strain rates (~ < 100 s-1 ) and on the micromechanical causes of the rate dependency of dynamic initiation fracture toughness. The validation of developed fracture criteria requires careful experimental testing, and problems associated with instrumented impact testing are discussed. Some results are given for 150M 12 and 817M40/En24 structural steels.