Learning Forum

[mihalka1]

Hello fellow users. I'm a student learning ansys mechanical. I'm doing a static 3-point bend test and I was wondering if there is a way to make a crack to form on the tip of the groove, which is round.

I tried the SMART crack growth with a pre-meshed crack, but wasn't able to get a crack to form, even at 5x the calculated force needed at many different mesh sizes.

I also wanted to insert the semi-elliptical crack, but I always get "Mesher failed to generate crack meshing."

The material model is defined by Isoentropic Elasticity and Drucker-Prager + Softening with Fracture Energy.

Any advice to get a crack started and going?

[Sourabh Upadhyay]

Hi,

Please meake sure to define a local coordinate system at the crack tip with X axis orientation in crack growth direction, Y axis orientation in normal to crack plane. Condsider the points mentioned in: 5.5.6. Crack Initiation and Propagation using SMART Crack Growth

A tutorial on premeshed crack is present: (1) ANSYS Mechanical: Fatigue Crack Growth Analysis using SMART Crack Growth - YouTube

Though a nonlinear material can be used for fracture parameter evaluation using any crack types but inclusion of SMART for crack propagation makes the analysis linear. Refer: 5.5.5.2. SMART Crack-Growth Assumptions and Limitations

This course on AIC will be helpful for starting with Fracture simulation: Workshops on Advanced SMART Approaches in Fracture Mechanics | Innovation Space

Many more example can be found in Ansys help.

 

Regards,

Sourabh Upadhyay

 

[ErKo]

 

HI

Just to add to the above some benchmarks to look at:

Appendix A. Fracture Analysis Benchmarks

A.2. Disk-Shaped Compact Tension (CT) Specimen Subjected to Cyclic Tensile Loading

All the best

Erko