Miljövarudeklarationer, EPD
EPD, som är en förkortning av Environmental Product Declaration, beskriver en produkts miljöpåverkan sett till dess livscykel. Läs mer här om hur den används.
Never rely on one set of Analysis Results!
The only exception to this is displacements results. However, in most cases we are usually interested in stress results which are required to calculate the factor of safety of our designs. When analysing results, we need to make sure the stress value is not affected by changing the mesh size. I usually get asked a lot on "What element size should I use to get an accurate result?" In response to the question I usually say, "I honestly dont know" but I also say, "Analyse your results 3 times with a different mesh size in each analysis". This is more formally known as manual mesh convergence (sometimes also referred as mesh sensitivity study).
Below is my suggested workflow*.
Step 1 - Analyse with default mesh size.
Step 2 - Analyse again by reducing the mesh element size by half.
Step 3 - Analyse again by further reducing the Step 2 mesh size by half.
Sometimes you may need to run an analysis a fourth time in the case when stress comparison is either very close to 10% or above it. If this is the case I suggest you use local mesh control at the area of high interest rather than changing the global mesh size. This will help to reduce the file size in addition to quicker run times.
However, in some cases the stress value will keep on rising as you make the mesh finer. This phenomenon is referred to as stress singularities (or hotspots) which leads to my next section on stress singularities and how to avoid them.
If you would to watch some of the videos I have created around Autodesk Simulation then please take a look at our Simulation webinar library.
* Some software's have the ability to run a mesh sensitivity study.
EPD, som är en förkortning av Environmental Product Declaration, beskriver en produkts miljöpåverkan sett till dess livscykel. Läs mer här om hur den används.
Ett av de smartaste sätten att ligga steget före är att utbilda sig i Autodesk Civil 3D i kombination med Naviate – två kraftfulla verktyg som tillsammans kan revolutionera ditt sätt att arbeta med projektering.
I denna guide förklarar vi vad en BOM är, hur den fungerar och varför den är så viktig för att lyckas med produktutveckling. Oavsett om du är ny på området eller vill optimera dina BOM-processer är detta en värdefull guide.