The ISO 6892 standard for tensile tests serves as the basis for many national standards such as EN 10002, BS 18, JIS Z 2241, GB 228,
KS B 802 as well as ASTM's E8 or A370 and stipulates testing methods for tensile tests. These standards do not all deliver identical results because the requirements regarding specimen shapes, testing speeds, and the methods for determining the results tend to vary.

Users of Zwick testing machines with a testXpert® standard test program can always be certain that they are applying the correct test parameters, regardless of whether they test to ISO, EN, or ASTM.

The large scope of applications is covered by a broad selection of load frames (zwicki Line, ProLine, Allround Line) with electromechanical, hydraulic, or hybrid drives and different specimen grips such as wedge, wedge screw, pneumatic and hydraulic grips.

The determination of the proof stress and strain at maximum load as well as of the n-value (ISO 10275) requires an accurate extensometer. Zwick’s incremental extensometers – Makro, MuliXtens, OptiXtens, as well as the incremental clip-on extensometer – meet these requirements completely, or even surpass them. They allow very long measurement travel of up to 700 mm in Classes 0.5 or 1.
The r-value (ISO 10113) is determined using a width monitor that can detect changes in width parallel to the strain with high resolution and accuracy.

Units are also available for determining the original cross section with the measurement precision stipulated in the respective standards. Some of these units feature automatic centering.


Bending Tests

Bending tests as described, for example, in DIN EN ISO 7438,
ASTM E 290, JIS Z 2248, and KS 0803, are classic testing procedures for determining plastic deformation.

The bending test results reveal the behavior of the material near the surface of the specimen. The basis for this is the bending angle, which can be determined from the feeder travel measurement.

With the help of the testXpert® software, Zwick testing machines can compensate for the deformation of the load frame, load cell, and the bending tools. This allows the measurement with the testing machine’s crosshead travel monitor to be made with sufficient accuracy. This simplifies the operation of the testing machine for QA purposes in particular.


Testing of Plasticity, the Friction Coefficient, or Abrasion

Tests to the current standards for testing plasticity such as


* DIN 50102 or ASTM E 643 for indentation tests
* DIN 50101 for the Erichsen test
* EN 1669 for the cupping draw test (Earing test)

can be performed with a basic machine (max. indentation force up to
600 KN) and the respective tools, which can be exchanged quickly and simply.

Every testing machine can be modified for determining the friction coefficient or the abrasion of coated sheet metal compliant to VDA 230/01.