DYNAMIC TESTS ON HIGH STRENGTH STEEL
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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Results of tension tests on specimens machined from a specially fabricated high strength reinforcing steel are presented. Yield stress of the steel was determined over a range of strain rates from the static value of 7 x 10 to the -6th power in.in.sec up to a maximum dynamic strain rate of 0.375 in.in.sec. The increase in yield stress for a given dynamic strain rate is computed from the ratio of the yield stress obtained at the dynamic rate to that obtained at the static rate. The increase in dynamic yield stress for the high strength steel is lower than that previously reported for conventional reinforcing steels. Compared with static test results, the dynamic loading on high strength steel resulted in little increase in ultimate strength and no discernible change in reduction in area or in percent elongation at rupture. Dynamic tests were conducted on two types of machines hydraulic and pneumatic - to provide information about the operating characteristics of the machines. This information was used to formulate the specifications for a dynamic testing machine.
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