Title:Numerical Analysis of Residual Stresses Effect in Multi-materials
Volume: 17
Issue: 1
Author(s): Sara Ramdoum*
Affiliation:
- Department of Mechanic, Laboratory Study and Research in Industrial Technology, ERTI, Faculty of Technology,
University of Blida 1, Ouled Vaich, Algeria
Keywords:
Metal, ceramic, finite element method, multi-materials, stresses, thermal, mechanical.
Abstract:
Background: In this study, the effect of mechanical and physical properties of the
metal and temperature is highlighted. The purpose of this study is to analyze the effect of these
stresses on multi-materials. This work aimed to conduct a three-dimensional numerical study by
the finite element method on the levels and distributions of the stresses in the
Al2O3/NI/HAYNES multi-materials. These stresses of thermal and mechanical origin are generally
detrimental to the service life of multi-material.
Methods: The use of numerical resolution by finite element method is the most suitable for complex
mechanical problems. It allows a more in-depth analysis of all points of the structure. In this
study, a fundamental tool was constructed to resolve the mechanical behavior of materials subjected
to complex solicitations. Therefore, the ABAQUS calculation code version 6.14 was used
to analyze the residual stresses.
Results: By interpreting the results in terms of stress variation, we identified the areas at risk; in
particular, the nature of a joint effect plays a decisive role in the assembly of the right material in
its mechanical resistance. This nature is defined in terms of stiffness (Young's modulus) and differential
expansion (coefficient of thermal expansion).
Conclusion: The presence of strong residual stresses can constitute a risk of damage to several materials.
The difference between the coefficients of thermal expansion of the two materials (metal and ceramic)
linked together induces, in these two constituents, normal internal stresses. This difference determines
the level and distribution of these constraints. Moreover, the sign of this difference determines
the state of the normal stresses.
