The endurance limit, sometimes called the fatigue limit, is the stress level below which the material will never fail due to fatigue, no matter the number of load cycles it is subject to. Ferrous alloys (such as steel) and titanium alloys have a definite endurance limit....
Besides the surface factor (https://fea-solutions.co.uk/surface-factor/), the stress concentration factor or notch sensitivity is another key modification that could reduce the endurance limit. The stress concentration factor is used to account for the effect of irregularities or discontinuities such as holes, grooves or notches that are not...
The endurance limit (https://fea-solutions.co.uk/s-n-curves/) of a material is either obtained from a fatigue test (https://fea-solutions.co.uk/static-test-vs-fatigue-test/) or estimated using the ultimate tensile strength of the material if the test data is not available. Such an endurance limit does however not take into account the effects of...
When conducting a strain based fatigue analysis (https://fea-solutions.co.uk/strain-based-fatigue-analysis/), the E-N curves of the materials used are required, where E stands for ε (epsilon), the symbol for strain, and N for the number of loading cycles with the graph showing the mean stress over the number...
When conducting a stress based fatigue analysis (https://fea-solutions.co.uk/stress-based-fatigue-analysis/), the S-N curves of the materials used are required, where S stands for σ (sigma), the symbol for stress, and N for the number of loading cycles with the graph showing the mean stress over the number...
Static Test vs Fatigue Test To obtain mechanical properties for a material, physical specimen tests are performed depending on the types of material properties that are desired. Two examples of these tests are: - Static specimen test - Fatigue specimen test. Static tests are used to obtain the mechanical...
A fatigue analysis is performed to calculate whether a structure will fail after a certain number of repeated loading and unloading, so-called load cycles, rather than after one load cycle as simulated in a static analysis. The fatigue failure is due to initiation and propagation...
Since the beginning of mechanical engineering, static (https://fea-solutions.co.uk/static-vs-dynamic-analysis/) tests have been used to determine the strength of designs. This was suitable for structures such as houses, towers and bridges, subjected to static loads due to self weight (https://fea-solutions.co.uk/mass-and-weight/). With the Industrial Revolution, machines were introduced...
When performing a FEA stress analysis, a linear-elastic (https://fea-solutions.co.uk/elasticity-and-plasticity/) material model is usually selected. In case the resulting peak stresses are found to be above the yield strength of the material, the underlying assumption that the material would behave in a linear-elastic manner has been...
When a welded component is simulated in FEA, there are two ways to represent the welds: - Treating the welded components as a single part. - Modelling the weld seam in detail. As in most cases the weld geometry is small compared to the overall size of the...