Sentence examples for model is unserviceable from inspiring English sources

It is shown that the effect of transverse strains of the interlayer on displacements and stresses cannot be neglected for thick beams and the common quasi-elastic interlayer model is unserviceable for beams with viscoelastic interlayer with the repeatedly loading-unloading path.

"The model is working.

"The model is perfect".

"The model is broken".

What model is it?

"Their model is outdated.

"That model is the right model.

"The first model is the correct model".

Whose model is superior?

This model is the crystal chain model.

The alternative model is the 'regulatory model'.