Data on the viscoelastic behavior of neoprene rubber

The present article contains data on the multi-step cyclic stress relaxation tests associated with the viscoelastic behavior of the neoprene rubber. Herein, the present data aims the accurate prediction of the time dependent mechanical behavior of the polymeric materials. The findings of the present data include the demonstration of the Mullin׳s stress-softening phenomenon, clearly. These data findings may serve as a benchmark to validate the more advanced phenomenological model developments in future as compared to the existing ones.


a b s t r a c t
The present article contains data on the multi-step cyclic stress relaxation tests associated with the viscoelastic behavior of the neoprene rubber. Herein, the present data aims the accurate prediction of the time dependent mechanical behavior of the polymeric materials. The findings of the present data include the demonstration of the Mullin's stress-softening phenomenon, clearly. These data findings may serve as a benchmark to validate the more advanced phenomenological model developments in future as compared to the existing ones.
& 2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Subject area
Materials Science More specific subject area Polymeric Materials Type of data Graph, Figure  How  Value of the data The obtained multi-step cyclic stress relaxation test data are a good candidate to validate the viscoelastic behavior of neoprene rubber through the constitutive modeling of the rubber-like materials.
The findings of the data may serve as a benchmark to validate the more advanced phenomenological model developments in future as compared to the existing ones.
These data also add the potential value in characterizing physical mechanisms of the polymeric rubbery materials in future.

Data
Attaining the multistep-stress relaxation test data is a classical way to model the time-dependent behaviour of the soft materials, and it allows to access different deformation phenomena too [1,2]. Herein, the experimental data include the multi-step cyclic stress relaxation tests in appropriate details. These details contain four different tests with the corresponding strain rates and relaxation time as shown in the Table 1. We designed four multi-step cyclic stress relaxation tests to investigate the time-dependent behavior of neoprene rubber.

Specimen detail
For the data collection, a neoprene rubber material was used for the multi-step cyclic stress relaxation tests. Four dumbbells specimens of neoprene rubber were made according to ASTM specification D638-10 (Type-I) (ASTM-D638, 2010), and the experiment is conducted at room temperature. The standard gage length of the test specimen was 50 mm as shown in Fig. 5.

Machine detail
For the data collection, Tinius Olsen H5KS universal testing machine with 250 N load cell capacity was used to test the viscoelastic property of the neoprene rubber.

Working method
For the data collection, the strain steps were taken as 50%, 100%, and 150% in all the tests. In the Test-1, the specimen was first strained up to 50% at a strain rate of 0.01 s -1 and hold there for 20 s.   Then, it was again strained up to 100% and was held there for predefined relaxation period 20 s. Further, it was again strained up to the final value of 150%. This completes the half cycle of loading. Now, for the unloading cycle, the whole process was repeated immediately at the predefined strain rate of 0.01 s -1 and 20 s relaxation time. The same experimental procedure was performed for the other tests also with the corresponding strain rate and the relaxation time shown in Table 1. The other tests detail may be obtained from the output plots as shown in Figs. 1-4.

Data applications
The collected data on the multistep-cyclic stress relaxation tests for a neoprene rubber get applications in the field of soft material modeling, which may help to enhance the accuracy of the time dependent behavior.

Acknowledgments
Thanks are extended to the Indian Institute of Technology Patna, India for in-kind supports and the experimental facility.

Transparency document. Supporting information
Transparency data associated with this article can be found in the online version at https://doi.org/ 10.1016/j.dib.2018.10.081.