Niall O Cuilleanain (Supervisor: H. Gerwig)

Tungsten HCal: Single Section Analysis

Initial results of improved structural integrity due to Tungsten plates

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1 (steel structure only): The Tungsten plates are represented by point masses- ‘dead weight’.

Model 2 (both steel structure & the connected Tungsten plates):Here we see a symmetrical half of a module of the Tungsten HCal.

Both models are supported at the section’s external face (3 or 9 o’clock position), and under Standard Gravity.

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1 -Deformation

Max. Total Deformation: 2.97mm

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 2

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 2 - Deformation

Max. Total Deformation: 1.63mm

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1 v. Model 2

Max. Deformation: 2.97mm Max. Deformation: 1.63mm

c. -33%

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1-Equivalent Stress distribution

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 2

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 2 – Eqv. Stress distribution (plates are ‘hidden’)

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 2 – Eqv. Stress distribution

Niall O Cuilleanain (Supervisor: H. Gerwig)

Model 1 v. Model 2

Max. Stress: 169MPa Max Stress: 63MPa

c. -63%

Niall O Cuilleanain (Supervisor: H. Gerwig)

Conclusions- Main points

• The modulus of elasticity of the pure Tungsten plates were underestimated

E=350GPa, as opposed to E= c. 400GPa.

• The analyses must be redone with bolted rather than welded connections, which will inherently give smaller reductions.

• The presence of the brackets between each plate must be considered.

• These are promising initial results.

Niall O Cuilleanain (Supervisor: H. Gerwig)

Where next?• After the single section analysis, I wish to compare the 2 models of the entire HCal structure, in order to analyze the reductions given;

i.e. Model 1 (including the point masses), and Model 2 (including the actual Tungsten plates), as we have seen here.

• How can we improve the structural integrity?

Niall O Cuilleanain (Supervisor: H. Gerwig)

Other current analyses

• Crane support of a single section: -where best to support a single section? -how much does it deform in each case?

• Single Tungsten plate (12mm):-what deformations are produced when the

plate is supported in different ways & at different points?

Niall O Cuilleanain (Supervisor: H. Gerwig)

Other current analyses

Entire HCal (Tungsten modeled by point masses): - What deformations and stresses are produced in the HCal? (supported at 3 & 9 o’clock positions)