The problem is :
- in tiny displacements (the deformations of the structure ensuing from its loading area unit negligible and don’t have an effect on much, not its geometry),
- quasi-static (no dynamic effect),
- almost equal (no modification in temperature).
These simplifications permit straightforward and quick calculations, machine-controlled (by computer) or by hand. However, they’re generally inappropriate, in particular:
Highly heterogeneous or anisotropic materials area unit ofttimes used, like composite materials, wood, bolstered concrete;
some applications involve vital elastic deformations, particularly with versatile materials (composite materials, polymers), it’s then now not within the linear domain or that of tiny displacements.
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Bon courage 🙂