NiTi Rotary File Deformation FEA

@miskinarati

The key challenge in NiTi rotary file analysis is accurately capturing superelastic material behavior, cyclic loading, large deformation, and contact with the root canal without oversimplifying the physics. I can develop the Abaqus FEA model for the NiTi rotary file, including appropriate NiTi constitutive behavior, nonlinear geometry/contact, boundary conditions, and torsional/bending loading. I can then evaluate deformation, stress/strain response, and failure-prone regions and correlate the results with the expected file behavior. I have 7+ years of FEA experience with nonlinear structural simulations and Abaqus-based engineering analysis. Do you already have the NiTi material stress–strain/phase-transformation data and the required root-canal geometry?

@mahmoudralizadeh

Capturing the helical-flute stress concentration and the superelastic NiTi transformation response under simultaneous canal contact, bending, and torsion is the key to making this model clinically meaningful not simply producing stress contours from a rotating CAD model. The workflow I would use is: - inspect and clean the supplied CAD while preserving the variable taper and flute-root geometry; - build a locally refined 3-D mesh around the flute roots, tip, and high-curvature regions, with a mesh-sensitivity check on displacement and peak strain; - define a superelastic NiTi constitutive model using the available austenite/martensite properties, transformation stresses, and transformation strain; - establish nonlinear file–canal contact and reproduce the shaping path using the canal geometry together with the recorded torque/speed conditions; - evaluate combined bending/torsional response, tip displacement, stress/strain concentration, transformation response, and the locations most likely to initiate excessive deformation; - compare the numerical displacement and strain pattern against your high-speed-video and discarded-file observations. My background combines 7+ years of engineering work, extensive engineering design/SolidWorks experience, and validation-focused numerical simulation workflows, including mesh-independence and quantitative result verification. That validation discipline is especially important here because peak strain in a NiTi file can be highly sensitive to flute geometry, contact definition, and local mesh density. The final scope can include the editable/native solver model, mesh and material setup, boundary-condition/contact summary, contour plots, quantitative tip-displacement and strain results, mesh/convergence evidence, and a concise engineering methods report. Large raw solver result databases would be included only if specifically required. One scope point should also be kept explicit: deformation/strain-hotspot prediction is different from fatigue-life or cycles-to-fracture prediction; the latter would require suitable material-specific cyclic-fatigue data. Please send the CAD file, available NiTi material data, canal geometry/curvature, torque-speed records, and any measured displacement data so I can verify the modelling inputs and define the baseline case correctly.

@anantp31

Hi, I can help with the FEA of the NiTi rotary file, including realistic torsional, bending, and combined loading conditions. I have experience with ANSYS-based simulation and mechanical analysis, including mesh refinement/independence, material modelling, deformation analysis, and interpreting stress/strain results. My previous work includes CFD and thermal simulations of a C-D nozzle, spiral solar air heater, and Li-ion battery, with quantitative post-processing and validation. For this project, I can work on the 3D mesh, NiTi material definition, contact/loading setup, deformation and strain contours, and provide a clear interpretation of critical regions. I will also structure the simulation setup and methods so the analysis can be reproduced later. I’m particularly interested in this project because it combines FEA, mechanical behaviour, and real-world loading conditions.

@KhatimiIlyass

Hello, I have carefully reviewed your technical requirements regarding the 3D FEA simulation of NiTi rotary endodontic files under combined bending and torsion loads. To accurately capture the clinical physics, standard elastic-plastic solvers are insufficient. I will implement a dedicated Superelastic / Shape Memory Alloy (SMA) constitutive model (Auricchio formulation in ANSYS/Abaqus) to precisely represent the austenite-martensite phase transformation and pseudo-elastic plateau of your NiTi alloy. Execution Plan: 1. Geometry & Fine Meshing: Geometry repair and sweep/hybrid refined meshing tailored to the variable taper and helical flute edges. 2. Material Calibration: Implementation of transformation stress parameters and transformation strain limits. 3.Non-Linear Contact & Boundary Conditions: Non-linear frictional contact between the rotating file and the root canal geometry, applying rotational speed and continuous cyclic bending. 4. Analysis &Deliverables: Stress concentration mapping (Kt), accumulated transformation/plastic strain contours, tip deflection correlation against your experimental records, full project database files, and a concise methodological report. I am ready to start immediately upon receiving your CAD model and motor speed-torque data. For more information about my profile you can check my LinkedIn account ILYASS KHATIMI Best regards, Ilyass KHATIMI Mechanical Simulation & CAE Engineer