TY - JOUR
T1 - Impact of strain rate on the Indentation Size Effect
T2 - Evidence of an intimate link between Size effect, Strain Rate and Ductility in Soda-lime Silica glass
AU - Shrestha, Pratikshya
AU - Smedskjaer, Morten M.
AU - Bauchy, Mathieu
AU - Hoover, Christian G.
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/8/1
Y1 - 2024/8/1
N2 - Many glasses exhibit the so-called indentation size effect (ISE), where the indentation hardness decreases with the maximum applied force. Here, we seek to uncover the connection between the ISE and strain rate in soda-lime silica (SLS) glass using micro-indentation. Two different loading protocols: constant loading rate (CLR), resulting in a nonlinear strain rate through the depth of indent, and a non-linear loading rate that gives a constant strain rate (CSR) with depth, are used to determine Hardness for six different strain rates and seven peak forces. A modified Bernhardt size effect law is then used to determine the extent of the ISE and load-independent hardness. We show that a small increase in micro-ductility, which can be achieved by either switching from a CLR to CSR protocol or by increasing the applied rates, can greatly reduce the extent of the ISE and slightly reduce the load-independent hardness.
AB - Many glasses exhibit the so-called indentation size effect (ISE), where the indentation hardness decreases with the maximum applied force. Here, we seek to uncover the connection between the ISE and strain rate in soda-lime silica (SLS) glass using micro-indentation. Two different loading protocols: constant loading rate (CLR), resulting in a nonlinear strain rate through the depth of indent, and a non-linear loading rate that gives a constant strain rate (CSR) with depth, are used to determine Hardness for six different strain rates and seven peak forces. A modified Bernhardt size effect law is then used to determine the extent of the ISE and load-independent hardness. We show that a small increase in micro-ductility, which can be achieved by either switching from a CLR to CSR protocol or by increasing the applied rates, can greatly reduce the extent of the ISE and slightly reduce the load-independent hardness.
KW - Constant loading rate
KW - Constant strain rate
KW - Hardness
KW - Micro-Ductility
KW - Micro-indentation
KW - Modulus
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U2 - 10.1016/j.jnoncrysol.2024.123031
DO - 10.1016/j.jnoncrysol.2024.123031
M3 - Article
AN - SCOPUS:85194343873
SN - 0022-3093
VL - 637
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 123031
ER -