On Solving Nonlinear Elasticity Problems Using a Boundary-Elements-Based Solution Method
Abstract
:1. Introduction
2. Governing Equations and Solution Method
2.1. Basic Definitions and Governing Equations
2.2. Solution Method Using the LPI-BEM
- Particular Integral:
1/ Initialisation: material data, loading steps, etc. |
2/ Conventional BEM phase
|
3/ Radial point interpolation phase
|
4/ Apply boundary conditions:
|
5/ Nonlinear solution phase Do until the final load increment
|
6/ End program |
3. Numerical Examples
3.1. Material Models
- Isotropic Saint Venant–Kirchhoff Model
- Isotropic Neo–Hookean Model
- Isotropic Mooney–Rivlin Model
- The Transversely Isotropic Saint Venant–Kirchhoff Model
- Neo–Hookean Transversely Isotropic Model
3.2. Case of Uni-Axial Loading
3.2.1. Unit Cube under Tension
- Saint Venant–Kirchhoff Solid:
- Neo–Hookean Solid:
- Mooney–Rivlin Solid:
- Transversely Isotropic Saint Venant–Kirchhoff Solid:
- Transversely Isotropic Neo–Hookean Solid:
3.2.2. Cases of a Cylindrical Specimen under Uniaxial Loading
3.3. Simple Shear of a Cubic Specimen
3.4. Constrained Tension of a Cubic Specimen
3.5. Bending of a Prismatic Bar
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Material | |||||
---|---|---|---|---|---|
Set 1 | 7.22 | 23 | 0.14 | 0.08789 | 4.20 |
Set 2 | 4.71 | 13.7 | 0.14 | 0.0997 | 1.49 |
SVK_T1 | SVK_T2 | NH_T1 | NH_T2 | |||||
---|---|---|---|---|---|---|---|---|
Anal | Num | Anal | Num | Anal | Num | Anal | Num | |
1.225 | 0.9273 | 0.92726 | 0.92456 | 0.9242 | 0.9359 | 0.93592 | 0.93356 | 0.93356 |
1.45 | 0.8315 | 0.83144 | 0.82479 | 0.8226 | 0.8682 | 0.868178 | 0.8632 | 0.86324 |
1.675 | 0.7032 | 0.70318 | 0.6902 | 0.6884 | 0.7952 | 0.79524 | 0.7874 | 0.78746 |
1.9 | 0.5189 | 0.51884 | 0.4931 | 0.4894 | 0.7162 | 0.716116 | 0.7054 | 0.7054 |
Saint Venant–Kirchhoff | Neo–Hookean | SVK_T1 | NH_T1 | |||||
---|---|---|---|---|---|---|---|---|
−1.8571 | −3.24745 | −3.09577 | −4.018277 | |||||
Anal | Num | Anal | Num | Anal | Num | Anal | Num | |
0.775 | 0.775 | 0.775 | 0.775 | 0.775 | 0.775 | 0.775 | 0.7625 | |
1.03917 | 1.03918 | 1.0507 | 1.0507 | 1.054 | 1.05436 | 1.063 | 1.0543 | |
−2.30175 | −8.612425 | −3.837 | −7.9176 | |||||
Anal | Num | Anal | Num | Anal | Num | Anal | Num | |
0.55 | 0.6044 | 0.55 | 0.55 | 0.55 | 0.6044 | 0.55 | 0.5152 | |
1.0675 | 1.06159 | 1.1179 | 1.1179 | 1.0933 | 1.08523 | 1.1298 | 1.1238 |
Model | ||||||||
---|---|---|---|---|---|---|---|---|
Stress component | Saint–Venant | Neo–Hookean | Mooney–Rivlin | SV_T1 | SV_T2 | NH_T1 | NH_T2 | |
0.755 | 0.3125 | 0.1042 | 0.436 | 0.2854 | 0.1979 | 0.1291 | ||
0.417 | 0 | −0.208 | 0.238 | 0.1563 | 0 | 0 | ||
0.104 | 0 | 0.1042 | 0.078 | 0.0532 | 0.0377 | 0.0260 | ||
1.354 | 1.25 | 1.25 | 0.792 | 0.5164 | 0.7917 | 0.5164 |
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Korbeogo, A.R.; Bonzi, B.K.; Kouitat Njiwa, R. On Solving Nonlinear Elasticity Problems Using a Boundary-Elements-Based Solution Method. Appl. Mech. 2023, 4, 1240-1259. https://doi.org/10.3390/applmech4040064
Korbeogo AR, Bonzi BK, Kouitat Njiwa R. On Solving Nonlinear Elasticity Problems Using a Boundary-Elements-Based Solution Method. Applied Mechanics. 2023; 4(4):1240-1259. https://doi.org/10.3390/applmech4040064
Chicago/Turabian StyleKorbeogo, Aly Rachid, Bernard Kaka Bonzi, and Richard Kouitat Njiwa. 2023. "On Solving Nonlinear Elasticity Problems Using a Boundary-Elements-Based Solution Method" Applied Mechanics 4, no. 4: 1240-1259. https://doi.org/10.3390/applmech4040064