Loading in Mode I fracture refers to

Yes sir, i understand your query anf like to give you brief as follows:

Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials.

Fractography is widely used with fracture mechanics to understand the causes of failures and also verify the theoretical failure predictions with real life failures. The prediction of crack growth is at the heart of the damage tolerance mechanical design discipline.

There are three ways of applying a force to enable a crack to propagate:

• Mode I fracture – Opening mode (a tensile stress normal to the plane of the crack)
• Mode II fracture – Sliding mode (a shear stress acting parallel to the plane of the crack and perpendicular to the crack front), and
• Mode III fracture – Tearing mode (a shear stress acting parallel to the plane of the crack and parallel to the crack front).

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