BigLHArrow S E R V I C E S BigRHArrow



  Engineering Design Services Overview SmallArrowRH



 SmallArrowRH Castings

 SmallArrowRH Extrusions

 SmallArrowRH CNC Parts

 SmallArrowRH Plastics & Injection Moulding

 SmallArrowRH Elastomers

 SmallArrowRH Sheet Metal & Fabrication



 SmallArrowRH Gears & Springs

 SmallArrowRH Hydraulics & Pneumatics

 SmallArrowRH Jigs & Fixtures



 SmallArrowRH Tolerance Analysis

 SmallArrowRH Mechanims

 SmallArrowRH Kinematics



 SmallArrowRH ElectroMechanical

 SmallArrowRH Machine Design

 SmallArrowRH Precision Engineering



BigRHArrowBigRHArrowComputer Aided Engineering (CAE)  BigRHArrowFinite Element Analysis (FEA) Types continued

SmallLHArrow Non-linear Statics SmallRHArrow

The use of non-linear properties can become very important. Non-linear needs to be used when linear approximations of any of the following characteristics become too inaccurate for the problem in hand. Non-linear may be used to solve problems where there may be a combination of non-linear characteristics. These are;

Materials used may be highly non-linear (stress/strain curve) and exhibit properties such as hyperelastic (elastomers such as rubber), viscoelastic (creep such as glass), elasto-plastic (most metals have elasto-plastic properties but it is not significant most of the time). Material models become very important, and the end solution is only ever as good as the information established at the beginning of the analysis - rubbish in = rubbish out!


Geometric non-linearity is where the stress and strain of the model no longer relate to each other. I.e The stiffness of the model changes under load. The model becomes distorted exhibithing enhanced or reduced stiffness giving stresses that no longer have anything to do with the strain exhibited by the model. Geometric non-linearity is usually interpreted as large deflection, even though this is true, geometric non-linearity may occur under very small deflections/strains.


Moving (or non-static) boundary conditions. Now that we've dicsussed matarial and geometric non-linearity, it should become clear that if the model stiffness and materials are changing under load, then so are boundary conditions. For example, if a load is placed ot the end of a cantilver beam, then that load will no longer be applied with the same vector quantity as the beam deforms under the load.


SmallLHArrow Non-Linear Dynamic SmallRHArrow

Pretty much the holy grail of analysis. A combination of all the non-linear and dynamic analysis techniques discussed.