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Keywords: sharp indenters
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1981
ISBN-10: 0-8031-0731-5
ISBN: 978-0-8031-0731-1
... Half-penny shaped cracks called median vents are formed about indentations made with sharp indenters in brittle materials. Two fracture mechanics analyses for the formation of median cracks exist and constitute a basis upon which the fracture toughness ( K c ) can be obtained from indentation...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1979
ISBN-10: 0-8031-0365-4
ISBN: 978-0-8031-0365-8
... by performing tests on a number of polycrystalline ceramics, glass-ceramics, and glasses which span a range of fracture toughness from 0.7 to 4.5 MN −3/2 . Various sharp indenter geometries were tested and it was concluded that cracks produced with the Vickers indenter were the easiest to measure. The existing...