TY - JOUR
T1 - Correlation of dynamic compressive properties, adiabatic shear banding, and ballistic performance of high-strength 2139 and 7056 aluminum alloys
AU - Kim, Selim
AU - Jo, Min Cheol
AU - Park, Tae Won
AU - Ham, Jinhee
AU - Sohn, Seok Su
AU - Lee, Sunghak
N1 - Funding Information:
This work was supported by the Agency for Defense Development (grant No. UE161030GD ), the BK21 Plus Center for Creative Industrial Materials, and the Korea University Grant for Prof. S.S. Sohn. This work was also supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE, P0002019 , The Competency Development Program for Industry Specialist ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/2/15
Y1 - 2021/2/15
N2 - In this study, laboratory-scale Split Hopkinson pressure bar (SHPB) tests were conducted on commercial armor plates composed of 2139 and 7056 Al alloys to investigate their dynamic compressive properties in relation to adiabatic shear band (ASB) formation. The results were then correlated to those of the ballistic performance as measured from V50 ballistic impact tests. In the SHPB tests, the 2139 alloy was compressed and flattened with traces of cracking, whereas cracks initiated in a shear mode in the 7056 alloy and propagated to produce several pieces. The cracking behavior was further analyzed by interrupted SHPB tests, which confirmed that shear cracking occurred through the formation of deformed ASBs and subsequent locally transformed ASBs. These processes started much earlier in the 7056 alloy; therefore, it showed a lower critical strain for initiating the ASBs and lower resistance to ASB formation. This result corresponded well with the actual V50 ballistic impact test results, which confirmed the better ballistic performance of the 2139 alloy. The resistance to dynamic and ballistic deformation was quantitatively discussed using the susceptibility to ASB formation.
AB - In this study, laboratory-scale Split Hopkinson pressure bar (SHPB) tests were conducted on commercial armor plates composed of 2139 and 7056 Al alloys to investigate their dynamic compressive properties in relation to adiabatic shear band (ASB) formation. The results were then correlated to those of the ballistic performance as measured from V50 ballistic impact tests. In the SHPB tests, the 2139 alloy was compressed and flattened with traces of cracking, whereas cracks initiated in a shear mode in the 7056 alloy and propagated to produce several pieces. The cracking behavior was further analyzed by interrupted SHPB tests, which confirmed that shear cracking occurred through the formation of deformed ASBs and subsequent locally transformed ASBs. These processes started much earlier in the 7056 alloy; therefore, it showed a lower critical strain for initiating the ASBs and lower resistance to ASB formation. This result corresponded well with the actual V50 ballistic impact test results, which confirmed the better ballistic performance of the 2139 alloy. The resistance to dynamic and ballistic deformation was quantitatively discussed using the susceptibility to ASB formation.
KW - Adiabatic shear band (ASB)
KW - Aluminum alloy
KW - Ballistic performance
KW - Split hopkinson pressure bar (SHPB)
UR - http://www.scopus.com/inward/record.url?scp=85099247615&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2021.140757
DO - 10.1016/j.msea.2021.140757
M3 - Article
AN - SCOPUS:85099247615
SN - 0921-5093
VL - 804
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
M1 - 140757
ER -