Effect of yield stress and specimen size on the position of fracture toughness peak (FTP) in Ji-aW curves

✍ Scribed by J Xie; Y.W Shi

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 585 KB
• Volume: 33
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(89)90106-9

✦ Synopsis

Early work showed that there was a fracture toughness peak (FTP) as the fracture toughness changed with crack length/specimen width (aj W). It could be thought of as a "safe crack" for the cracks whose length is smaller than that where the FTP is located. In the present paper, it is indicated that the crack length of FTP is J,-a/W curves decreases with increasing yield stress of material and specimen size and decreasing test temperature. The reason for the fracture toughness being insensitive to the (a/W) for the ultra-high strength and brittle material is explained.