For the verification of the glued connections in a crash simulation, I would like to apply a connector element including failure.
To that end, an adhesive(glue) with /MAT/LAW59, /PROP/TYPE43 and /FAIL/CONNECT should be defined.
As a start, Example RD-E 4802 Solid and Spring Spotweld in Crash box is looked into, since this is the most resembling example.
However, two point remain unclear to me:
- The Youngs modulus of the adhesive(glue) is defined independent of height (i.e. [MPa/mm]), as stated in the theory manual and reference manual.
However, in this example this seems not to be the case.
The provided E = 210GPa, over a spotweld thickness of 1.8mm. That would mean that /MAT/LAW59/E = 210000/1.8 = 116666.67MPa/mm. However, the example .hm file uses a value of 21GPa.
Could you provide clarity w.r.t the Young’s (and shear) modulus? Should it be divided by the element height/connector height and is it than still possible to use >1 coat (multiple elements over the connector height) ? - It is unclear to me what is used as failure criteria.
The reference manual and example manual state that a relative displacement criteria is used (without SI unit).
However, in HM this variable is called epsilon_maxN (or epsilon_maxT) which would normally refer to a strain.
Furthermore, the example reference concludes from the Strain(VonMises) plot, that elements have failed.
Could you provide me clarity w.r.t the criteria on which is based when an element fails (and thus is deleted) and whether this is influenced by element/connector height?
