Breakage resistance of a Polycarbonate plate with flowed through drill hole

Click For Summary
SUMMARY

The discussion focuses on calculating the breakage resistance of a polycarbonate (PC) plate with a drilled hole subjected to a volumetric throughput of 35 ml/min. The plate dimensions are 150x40x12 mm, with a drill hole measuring 1.6 mm in diameter and 4 mm in length. Solidworks FloXpress was used to model the water flow speed at 0.5 m/s. The proposed approach treats the drill hole and surrounding plate as a thick-walled hollow cylinder under interior pressure, but the calculated factor of safety of 7.5e5 raises concerns about its validity.

PREREQUISITES
  • Understanding of fluid dynamics principles, particularly in relation to volumetric flow rates.
  • Familiarity with Solidworks FloXpress for modeling fluid flow.
  • Knowledge of material properties, specifically polycarbonate breakage resistance.
  • Basic concepts of pressure calculations in thick-walled cylinders.
NEXT STEPS
  • Research the effects of dynamic viscosity on fluid flow through small diameters.
  • Learn about pressure drop calculations in drilled holes within solid materials.
  • Investigate the phenomenon of cavitation and its implications in fluid dynamics.
  • Explore advanced modeling techniques in Solidworks for simulating stress and strain in materials.
USEFUL FOR

Engineers, material scientists, and fluid dynamics specialists involved in the design and analysis of polycarbonate structures under fluid flow conditions.

Ekaekto
Messages
7
Reaction score
2
Hi everyone,

I was wondering how to best calculate the breakage resistance of a drill hole which is being flowed through with a certain volumetric throughput within a polycarbonate (PC) rectangular plate. Well basically, the breakage resistance of the PC around the drill hole :)

The plate is 150X40X12 mm in LXWXH and the smallest distance of a drill hole to the edge of the plate is 8.8mm. The drill hole is 4mm in length and 1.6mm in diameter (there is a larger drill hole, which I needn't calculate at the 8mm of the rest of the height of the plate ;) )

The volumetric throughput is at 35 ml/min = 5.833333333345e-7 m^3/s, it's water at 20°C, so the dynamic viscosity is 1e-3 kg/ms
The speed of the water through the drill hole was modeled with the use of Solidworks FloXpress to equal 0.5 m/s.
I just want to know whether the PC plate will withstand the volumetric throughput without breaking.

The idea of a friend was to approach this problem as if the drill hole and surround plate was a thick-walled hollow cylinder under only interior pressure with inner diameter=1.6mm and outer diameter=2*8.8+1.6 mm = 19.2mm.
However when he calculated it, he calculated a factor of safety around 7.5e5, which seems exorbitantly high.

Thanks for your help. :)
 
Engineering news on Phys.org
A sectional diagram of the hole would better communicate the situation.
What is the maximum pressure drop through the hole, across the PC plate ?
Is cavitation possible at step changes in diameter ?
 

Similar threads

Volumetric flow from vessel through pipe to another vessel
  • · Replies 8 ·
Replies
8
Views
4K
Sink time of a cap with varying hole diameters
  • · Replies 21 ·
Replies
21
Views
9K
Calculating Water Flow Through Circular Holes: Speed, Pressure Drop & Formulas
  • · Replies 2 ·
Replies
2
Views
4K
Undergrad At what flow rate will water be pushed through a hole in a dam?
  • · Replies 2 ·
Replies
2
Views
7K
How Much Water Flows Through a 1cm Hole in a Minute?
  • · Replies 1 ·
Replies
1
Views
4K
How Do You Calculate Flow Rate and Water Level Change in a Tank with a Hole?
  • · Replies 7 ·
Replies
7
Views
8K