Validation of an open-sourced strain analysis code to assess fragility in 3D-printed porous structures designed for low-rigidity medical implants

In this paper, we performed a validation study for an open-sourced digital image correlation (DIC) algorithm to evaluate the localized strain behavior of a 3D-printed Ti porous structures designed for low-rigidity bone implants. This study has indicated that strain analysis can be easily conducted on basis of “grain-like pattern” of the additively-manufactured Titanium samples by the DIC code with no additional treatment. The validity of the results was assessed against commercial software for displacement tracking. The characterization of localized strains which supplements current standard mechanical testing could provide insights into the structural mechanics of the 3D-printed porous samples. The investigation of strain distributions is possibly critical for the comprehension of the linkage amongst microstructures and general mechanical property of the materials. This may help elucidate the structural failures in poorly designed microstructures utilized for medical implant applications.

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