You’ve made significant progress by studying and devoting time to FEA analysis and simulation. Everyone wants that period to, at long last, be fruitful and meaningful. Even you want to take advantage of the possibility of landing a career in which you have skills. So why don’t you broaden your knowledge to secure your ideal position?
You must be well-prepared to ace the interview if you have one, which you undoubtedly will or already have. You will receive the finite element analysis interview questions here, so prepare and give it your all.
Q1. List some advantages of FEM?
Ans. FEA makes it possible to model complex geometrical and asymmetrical structures with difficult load conditions that are impossible to solve with traditional techniques. Boundary conditions can take many distinct forms. Each element can be given a varied set of material attributes because its properties are evaluated independently.
Q2. What is the difference between FEM and FDM?
Ans. While FEM is a numerical approach for approximating solutions to boundary value issues for partial differential equations, FDM is a numerical method for solving differential equations by comparing derivatives.
Older than FEM, FDM is less computationally intensive but less accurate in some situations when higher-order accuracy is needed. FEM enables a better level of accuracy but uses more computing resources and is more demanding of the mesh’s quality.
Q3. List the properties of the Global stiffness matrix.
Ans. The global stiffness matrix is arranged by the total number of degrees of freedom. The matrix of global stiffness is one (needs boundary conditions to solve the system). The stiffness matrix’s columns are organised as an equilibrium set of the nodal forces necessary to produce each column’s degree of freedom. A system’s symmetric, sparse, square matrix represents its overall stiffness (most terms are null).
Q4. Why do we use polynomials for shape function?
Ans. Due to the following factors, polynomials are frequently utilised as shape functions. Polynomial differentiation and integration are simple. Raising the polynomial’s order can increase the results’ correctness. With a computer, it is simple to create and solve finite element equations using polynomials.
Q5. What is a plane strain condition?
Ans. A state of a strain known as “plane strain” is one in which the standard strain and shear strain directed perpendicular to the body’s plane are both zero. For long bodies in the expected direction with a constant cross-section, subjected to loads acting only in the XY plane, the plane strain assumption is applied; for example, A dam.
Q6. Define aspect ratio.
Ans. The ratio of an element’s most significant dimension to its smallest dimension is the aspect ratio. The precision of the answer frequently decreases as the aspect ratio rises. As closely as feasible to unity should be the aspect ratio.
Q7. Difference between global and local axes.
Ans. True, as differential equations can be approximated using the finite element method, a mathematical technique. The procedure involves discretising the differential equations guiding the modelled behaviour into a set of linear equations. Then, to simulate the entire problem, the short system of equations that specifies these finite elements is coupled with other equations. Then, by minimising an associated error function, the finite element method uses methods from the calculus of variations to approximate a solution.
