Development of a shear device for precise simple shear measurements of rubber mats

Abstract

This contribution deals with the development of a new shear specimen, which allows precise simple shear measurements for large shear values. The main idea is that the shear load for the rubber mat is applied via steel pins. A form fit connection has the advantage that for the load application, no clamping force or high friction coefficient is required. In addition, the disadvantages resulting from vulcanisation or bonding, for example, shrinkage, are avoided. This offers the big advantage that homogeneous ageing tests can be performed, and also fibre‐reinforced materials can be tested. In order to show the potential of the new pin design, simulation results are compared to each other, and also a first experimental implementation is conducted. The new shear specimen can be used for phenomenological investigations of rubber properties, like Payne effect, Mullins effect, anisotropy, permanent set, softening, recovery, creep and relaxation behaviour.

Digital image correlation based characterization of rubber material at large shear deformations in an extended temperature range

“…In Figure 2, the assembly of the shear device consisting of the U‐profile, the I‐profile, adapters, and pins are depicted. A detailed description of the device and the rubber mat preparation (punching process and DIC coating) can be found in the work of [11]. The shear device itself is installed in a testing machine from ZWICK/ROELL, see Figure 2.…”

“…As a consequence, there is no risk of buckling. For more information about numerical studies of buckling and experimental validation of buckling phenomena see [11].…”

“…Especially for tests in an extended temperature range a loading system without bonding/vulcanization is required. In [10] as well as [11] a new shear device with pins is presented, which enables precise shear measurements using a form fit connection.…”