The testing plant of materials is part of the accredited testing laboratory.
The test is performed both in the normative version (most often according to ČSN EN ISO 6892-1) and for atypical samples including non-standardized measuring procedures (e.g. testing of glued and soldered joints, very thin profiles, wood species, composite polymer materials, etc.). Two measuring devices are available for measurement: up to 100 kN, we use a universal ZD 10/90 tensile machine; up to 1,000 kN, we use a universal ZD 100 tensile machine. Since they are universal machines, other measurements such as static bending tests, static pressure tests, static shear tests, spring testing, dynamic tests, etc., can be performed after a simple adjustments using measuring devices is made.
Tensile tests are based on two basic procedures:
- Tensile test at ambient temperature
- Tensile test at reduced temperature
The standard specifies the requirements for test equipment, types of test specimens and test procedures. For some cases of tests, the laboratory also refers to the relevant special standards.
The list of test procedures the laboratory is accredited for can be found in the Appendix to the certificate.
Tensile tests are carried out on objects of full cross-section, e.g. pipes, wires and bars of smaller dimensions, on machined objects of tape types of rectangular or segmental cross-section and on objects of circular cross-section. The dimension of the cross-section tested must correspond to the length of the specimen, including the ends (so-called heads) for clamping in the test machine. If enough material is available, a sample length of 300 mm in the tested direction will be sufficient for most applications.
Production of test specimens according to the standard can be provided by a qualified supplier.
Impact bending test
The laboratory is equipped with a LabTest CHK450J Charpy Hammer with digital angle sensing. There is a replaceable cutting edge with a radius of 2 mm according to ISO ČSN ISO 148-1.
The standard defines the dimensions of the test specimens, the operational calibration of the test equipment and the actual performance of the test at ambient temperature as well as at defined temperatures. The laboratory is equipped with a device for setting the temperature of test specimens from -70°C to +20°C.
The result of the impact bending test is the work consumed to break the test specimen with a notch. The previous conversion to the area unit is, with some exceptions, no longer used. All figures are related to a standard body size of 10 x 10 mm with a V or U-notch of 2 mm, thus to an area of 10 x 8 mm.
The testing laboratory is equipped with a notching machine and prepares notches on the material samples delivered.
Testing plant of materials
Manager: Ing. Miroslav Kretek
More information about the contacts can be found here