Recent content by Graham1874

FAO Nidum: The attached conversion sheet explains the conversions from standard units to microscale units. Examples: 15 nanometres is equal to 15 x 10^9 metres. Then look at chart to convert to micro-units, giving 0.015 units to be input for FE model. 304GPa is equal to 304 x 10^9 Pascals...

I hate to bump my thread but I still haven't managed to derive an expression for the force vector. Anyone able to help?

For my project I have been advised that, to get the best mark, I need to back up my Abaqus results with mathematical calculations to prove that the Abaqus model can be considered legitimate. So yes, I will need to back up the visualisations with mathematical proof of the behaviour. I want to be...

Hi Nidum, That's very interesting! I am modelling the AFM in Abaqus FEA software but I'm a complete beginner so it's taken me 3 weeks to create the model! Can I ask: 1. Did you apply the displacement to the whole of Section A? 2. Did you make the Section A as a rigid body? 3. What material...

Thanks for your reply, haruspex. First of all, the important question for me - at this stage - is 'What are the y and z components of the force vector at the position of probe-substrate contact?'. I understand that this can be taken further but I purely want to analyse whether there is a y...

Hi haruspex, You're right, my diagram is incorrect with respect to the illustrated bending section. Linked to this, I am not sure if the probe tip will move in the negative y-direction (horizontal) to accommodate for the horizontal component of the length being decreased due to the bending? If...

Also, I have realized that friction will need to be considered because it will be opposing the horizontal movement of the tip caused by the horizontal component of the force vector at the tip. Hence this will create the static equilibrium condition. Let me know if you need any further...

Thanks Nidum, yes it's a plain rectangular strip.

For my study, I am primarily looking at the force vectors in a static state - although the full scenario is actually quasi-static I believe, as time does pass but none of the parameters I'm measuring are time-dependent. With this I am trying to decipher whether the common assumption that the...

I think I may have to consider the support at the probe tip as Pinned, and I'm not sure what, if any, to consider as the support for Section A? It is fixed in all DOFs apart from the z-direction. Any further help with this? I haven't managed to get very far, but this attached file shows the way...

Hi Nidum, thanks for your quick reply. Yes, the AFM probe is being used in that manner. For this stage of the project, I am wanting to assume initial contact between probe/surface on an assumed-flat surface to see the force components and moments which are acting at the point of contact. To...

To give a bit of context, I am doing my final year university project on micro-mechanical interactions between an AFM probe and a sample surface. I do not have notes for a system this complicated, as we always considered our systems to be rigid bodies. I was always relatively clueless at...

Homework Statement To give a bit of context, I am doing my final year university project on micro-mechanical interactions between an AFM probe and a sample surface. I do not have notes for a system this complicated, as we always considered our systems to be rigid bodies. I was always...