Abstract
In this study, finite element analyses are performed to obtain a stress-strain curve for ductile materials by a combination between the distributions of axial stress and strain at a certain time as a result of one single Taylor impact test. In the modified Taylor impact test proposed here, a measurement of the external impact force by the Hopkinson pressure bar placed instead of the rigid wall, and an assumption of bi-linear distribution of an axial internal force, are introduced as well as a measurement of deformed profiles at certain time. In order to obtain the realistic results by computations, at first, the parameters in a nonlinear rate sensitive hardening law are identified from the quasi-static and impact tests of pure aluminum at various strain rates and temperature conducted. In the impact test, a miniaturized testing apparatus based on the split Hopkinson pressure bar (SHPB) technique is introduced to achieve a similar level of strain rate as 104 s−1, to the Taylor test. Then, a finite element simulation of the modified test is performed using a commercial software by using the user-subroutine for the hardening law with the identified parameters. By comparing the stress-strain curves obtained by the proposed method and direct calculation of the hardening law, the validity is discussed. Finally, the feasibility of the proposed method is studied.
Highlights
The Taylor impact test, established by Taylor [1], is a quite simple impact compressive test
A miniaturized testing apparatus based on the split Hopkinson pressure bar (SHPB) technique is introduced to achieve the similar level of strain rate as 104 s−1 and to avoid the punching or indentation displacement [13]
It can be found that the stress-strain curve obtained from the miniature coincided with the result of the conventional testing apparatus in the range of the target strain rate apparatus almost coincided with result of testing apparatus in the range of the for this experiment
Summary
The Taylor impact test, established by Taylor [1], is a quite simple impact compressive test. In this test, a cylindrical slender specimen is shot to, and strikes the surface of a rigid body wall. The length of the deformed specimen is measured to determine the mechanical properties of the materials. As a result of the test, maximum strain rates as high as 103 –105 s−1 can be obtained. The test is applicable to a wide variety of materials such as metals [2], polymers [3,4], foams [5,6] etc. The test was originally used for measuring the impact yield strength, and the fairly reliable value of the strength can be obtained
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