Advait's thoughts and random notes on vol 6 and some random tangents that may be useful later on
Testing: Use ASTM Standards
Tests that I think we should run
Flatwise Tensile Strength
Used to measure bond strength between between face sheet and core
Face sheet compressive strength
Compressive strength of panel going into panel and core from side (so basically most strength comes from core bc you’re placing the face sheet flat on surface and then crushing)
Compressive strength
Crushing panel from top so that force is in plane w/ fibers
Flexure Creep
A type of creep test that measures the long-term mechanical behavior of a material
Flexural strength test
Determines bending or flexing of panel under a given force
Damage Resistance
CREEP IS IMPORTANT FOR COMPOSITES
What is creep - creep is the gradual deformation of a solid material over time when it's under constant mechanical stress, especially at high temperatures
Composites are viscoelastic materials
Viscoelasticity: the property of a substance of exhibiting both elastic and viscous behavior, the application of stress causing temporary deformation if the stress is quickly removed but permanent deformation if it is maintained
Due to this, composites are more susceptible to creep especially structural composites.
Evaluation of fasteners, inserts, and edges
There are concentrated stresses on attachment points
Most important properties for inserts and fasteners are generally core shear strength and modulus as well as face sheet compression strength
We will most likely be using fasteners and inserts which are put in after the panel is manufactured because this allows us to have a similar strength insert without having a position 100% confirmed
Core can be densified in locations (it hasn’t gone into how tho, not yet at least), and this increases strengths and is useful to prevent crushing and damage on edge of panels
We are most likely going to use the “Edge Cells Filled“ as its the easiest and I don’t think we need more strength than what this provides
In interest of keeping each of these documents short, I am making separate docs for each article (also so that they can be searched and read separately)
*For all notes I will only be focusing on methods and concepts relevant to us (aka stuff we could reasonably buy and manufacture)
Notes on Face Sheets and Adhesives