Technical Articles

Our regular series of technical articles is all about clarifying some of the most commonly held misconceptions in the field of materials mechanics and mechanical testing.

Premature Fracture during Tensile Testing

Most metals exhibit pronounced plasticity during deformation. The degree of plastic deformation that a metal can sustain before fracturing can largely be characterised in a tensile test. However, some metals (not many) are brittle, or can fracture prematurely during tensile tests.

Tension and Compression Asymmetry and the Bauschinger Effect

There is quite frequent reference in the literature to “tension/compression asymmetry”, meaning a difference between the inherent (plasticity) responses of a material when subjected to (uniaxial) compression or tension. This is largely a myth. Find out why in this article.

Necking Behaviour during Uniaxial Tensile Testing

Necking is observed in most tensile tests on metals, but detailed interpretation of stress-strain curves in the post-necking regime is complex, and frequently misunderstood.

Size and Shape Effects in Plasticity Testing

We explain why indentation on the nanoscale can never be used to reliably extract bulk mechanical properties from indentation tests, and we review the potential origins of indentation size effects and pop-in phenomena.

The Hard Truth about Hardness Numbers

Here is our view on why hardness numbers are as good as meaningless, and how they could be misleading your decision making processes around material safety and component integrity.

We use cookies

Click ‘Accept’ to allow Plastometrex to use cookies to personalise this site, and to deliver ads and measure their effectiveness on other apps and websites, inclusing social media. Click ‘Reject’ if you do not want us to use cookies for this purpose. Find out more in our Privacy Policy