Hollow samples – An alternative to autoclave technology


© Fraunhofer IWM
The figure shows the tensile testing machine for tests on hollow samples with internal gas pressure.

Tensile tests with hollow samples can provide meaningful results for assessing a material’s sensitivity to hydrogen. The samples have a hollowed-out center, which is pressurized in the test with a gas mixture containing hydrogen. The significance of the hollow sample technology is evident from current results of tensile tests on pipe steel. It shows a significant decrease in the elongation at break resulting from hydrogen embrittlement in comparison to reference tests in air. Tests with hollow samples can also be carried out more quickly, easily and cheaply than mechanical tests in pressure hydrogen autoclaves. They also reflect the real hydrogen gradients in a pipe.


Hollow samples – An alternative to autoclave technology

Link to the video »Neue Prüfstände zur Wasserstoffversprödung in Metallen«



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