Language

AutoFEM Static Analysis

The main goal of static analysis is to check a structure used in machine-building or construction for strength.
At that, for the purposes of static analysis, it is assumed that forces applied to the structure do not change with time going on.
Most often, assessment of the static strength is carried out by way of comparing calculated strains in the structure and the yield point of the respective material. If the structure's strains do not exceed the material's yield point, this means that, with the applied loads, the system suffers only elastic deformations and the shape of the structure will be completely restored after the load disappears. Such mode of the item's functioning is most favourable in most cases.
If the structure's strains exceed the material's yield point, the deformations which the item suffers from the applied loads become irreversible and the structure will be irreversibly deformed. As a rule, under operating conditions of the item, this is inadmissible, and one should avoid such cases. (For more detail about strength theories, see the AutoFEM Analysis user manual.)
It is for such check of the structure's strength that the AutoFEM Static Analysis module is intended. It ensures the calculation of strength and strained condition for machine-building and construction structures directly in the AutoCAD environment. In advance, a 3D model of the system subject to calculation must be created or imported in AutoCAD. The functionality of the static analysis module permits to solve a variety of problems related to strength calculation. It has the following functional possibilities:

  • take into account the geometric non-linearity;
  • determine the stress-strain state of temperature effect;
  • perform calculations of contact problems;

Accounting for the influence of different types of mechanic loads such as force, pressure, linear acceleration, centripetal acceleration, and torque moment, load of bearing, hydrostatic pressure, additional mass, and rigidity (elastic base). Also, one can account for and set preliminary deformations of the structure (preliminary strained condition).


Setting window parameters for static analysis

If it is assumed that under the load a part may suffer significant displacement, one should conduct static analysis which takes into account large displacements.

Large displacement (nonlinear)
Large displacements

The non-linear problem-solver organizes the process of incremental loading and provides the solution of the linear system of equations at each loading step.


Setting window parameters for non-linearity
Accounting for the influence of non-uniform distribution of temperatures on strains in the structure (thermal elasticity). Temperature fields for the analysis of temperature strains can be obtained from results of thermal calculations within the AutoFEM Thermal Analysis module.


Setting window parameters for the solution of thermal elasticity problem

Contact study
Contact problem

As a result of solving the problem of modelling the stressed state of the structure, numerous results are available, such as:

  • fields of displacements of the structure in nodes of finite-element mesh;
  • fields of strains - normal strains, shear strains, equivalent strains;
  • fields of components of the stresses - normal stresses, shear stresses, equivalent stress (von Mises stress);
  • energy of deformation;
  • reaction forces;
  • field of distribution of safety factors - factor of safety by principal stress, factor of safety by normal stress, factor of safety by equivalent stress.

This information is usually sufficient to predict the behaviour of structures and make a decision how to optimize the geometric shape of the product.

Below you can find various examples of using AutoFEM Static Analysis for solving problems of strength calculations.

Verification Examples of AutoFEM Static Analysis


Bending a cantilevered beam under a concentrated load


Bending a T-shaped beam


Deflection of a beam under a uniformly distributed load


Static analysis of a round plate clamped along the contour


Square plate subjected to force at centre


Clamped square plate under uniform loading


Cylindrical reservoir with walls of constant thickness


Torsion of a shaft with circular cross-section


Torsion of a beam with the square cross-section


Bar subjected to self-weight


Analysis of rotating solid disc of constant thickness

 

Deflection of the beam with the weight

 

Beam on elastic foundation

 

Large deflection of a plate

 

Bending a Beam under 3 Forces

 

Extension of a Beam under the Action of Two Forces

 

Torsion of a Shaft under the Action of Two Torques

 

Stresses and deformations of an orthotropic plate at biaxial tension

Thermoelasticity

 

Thermal deformations of a 3-D brick

 


Contact problems

 

Contact of flat spring


Contact between a cylindrical bar and a ring

Quick Start (Tutorial) on AutoFEM Static Analysis (online tutorial)

Welcome!

This lesson will help you to carry out the static strength calculation of the part with the help of the AutoFEM Analysis.

You will learn to:
create a Static Analysis study;
create a finite element mesh;
specify materials;
specify loads and restraints;
obtain calculation results in the form of colour plots.

Download tutorial video of the AutoFEM Static Analysis Module