What is abaqus XFEM?

eXtended Finite Element Method or XFEM is a revolutionary technique in the field of fracture mechanics since it lets one model a propagating crack without use of a focused mesh and without any previous knowledge of crack location.

What is Griffiths theory?

The Griffith theory states that a crack will propagate when the reduction in potential energy that occurs due to crack growth is greater than or equal to the increase in surface energy due to the creation of new free surfaces. This theory is applicable to elastic materials that fracture in a brittle fashion.

What is a Griffiths flaw?

Background. In 1921 Griffith [3] described crack growth in brittle materials in terms of the energetics of creating the two new surfaces of the crack. A crack in a brittle material grows if the elastic energy released upon crack extension is greater than that required to create the new surfaces of the crack.

Who is the inventor of crack theory?

Fracture mechanics was developed during World War I by English aeronautical engineer A. A. Griffith – thus the term Griffith crack – to explain the failure of brittle materials.

What is Griffiths law?

Definition. The Griffith theory states that a crack will propagate when the reduction in potential energy that occurs due to crack growth is greater than or equal to the increase in surface energy due to the creation of new free surfaces. This theory is applicable to elastic materials that fracture in a brittle fashion …

How do I perform an XFEM analysis in Abaqus?

Choose the type of XFEM analysis: By default, Abaqus will use the traction-separation cohesive behavior approach. You can select or create a contact interaction property that specifies the compressive and frictional behavior of the cracked faces based on a small-sliding contact formulation.

What are the advantages of using Abaqus/Explicit for Chip modeling?

• The chip with an initial defect is modeled with Abaqus/Standard • The rest of the body is modeled with Abaqus/Explicit—has advantages in handling complex contacts • Cosimulation interactions usingsubcyclingare defined on the chip and the

How does Abaqus create cracks during the simulation?

Regardless of whether you define the initial crack location, Abaqus initiates the creation of cracks during the simulation by searching for regions that are experiencing principal stresses and/or strains greater than the maximum damage values specified by the traction-separation laws.

How do I set the enrichment radius in Abaqus?

Choose Analysis default, to allow Abaqus to determine the enrichment radius. The default radius is three times the typical element characteristic length in the enriched area. Choose Specify and enter a value.