Status report AHCAL Mechanics Karsten Gadow CALICE Collaboration Meeting KEK, 19.04.2015 Studies of AHCAL absorber structure stability

status report

AHCALMechanics

Karsten GadowCALICE Collaboration MeetingKEK, 19.04.2015

Studies of AHCAL absorber structure stability

Karsten Gadow | CALICE Collaboration Meeting | 19.04.2015 | Page 2

AHCAL Mechanicsstatus report outline


• Submodule assembly and active layer integration

• Submodule transportation

• Submodule installation

• Absorber structure validation (static)

• Absorber structure validation (dynamic)


AHCAL Mechanicsstatus report








AHCAL MechanicsFE Model Parameters

parameters for submodule validations:

• Mesh Type

• shell bodies for all plates

• solid bodies for transportation and assembly brackets

• Mesh Statistics

• ~ 575.000 nodes, 295.000 elements

• refined local sub-models: 1.5M nodes, 870k elements

• Contacts

• bonded contacts (all DOF fixed) on lines and faces of shell bodies

• bolts modeled as spring elements in refined sub-model in case of high load concentrations


AHCAL submodulecase 0 absorber assembly and active layer integration

How to support the submodule during assembly and active layer integration ?


AHCAL submodulecase 0.1 absorber assembly and active layer integration

case 0.1: support on the side plate





case 0.2: support on absorber plate front edge







case 0.3: support on absorber plate 75 mm from side edge






AHCAL submodulecase 0 absorber assembly and active layer integration

conclusion:

• case 0.1 will is the best way to support the submodule

• supporting the submodule according case 0.2 and 0.3 will be not safe for the sensitive layers due to the local deformation of the plates

• to be sure, that the submodule stays on the side walls, we have to foresee an overlap of 3 mm from the edge of the side plates to the first absorber plate surface










AHCAL submodulecase 1 submodule transportation

10x2 M10 screws per bracket and fixed at layer 37 to 46

single crane hook



steel ropes for crane: modeled as 20mm dia. beam elements to central fixed point









conclusion:

• the transportation with one hook is possible without a risk to destroy the absorber stack

• the deformation of the stack is tolerable with the current design of the sensitive layer housings

• the lifting device needs a special investigation










AHCAL submodulecase 2 submodule installation

installation of submodules in front of the cryostat by crane

sub module connection by plates from the front and back side



• 2 x 18 t capacity

• operation with 2 hooks

• precise motor controlled turning

• adaptation for submodules with sensitive layers

18 t

18 t

lifting and turning tool for AHCAL barrel absorber sub-modules available



10x2 M10 screws per bracket layer 27 to 37

2 crane hooks

submodule validationcase 2.0: 0°case 2.1: 22,5°case 2.2: 45°case 2.3: 67,5°case 2.4: 90°case 2.5: 112,5°case 2.6: 135°case 2.7: 157,5°case 2.8: 180°

rotation point in gravity center



lifting beam for rotation and assembly: 4x100mm dia. beam elements to two fixed points



case 2.0



max. equivalent stress

MPa

° rotation



conclusion :

• the simulated behavior of the submodule during the rotation is in a save condition

• the connection to the turning tool has to be investigated more carefully

• during the simulation it turned out, that the connection plates of the submodules has to be modified for installation reasons










AHCAL Mechanicsabsorber structure validation (static)

• gravity + 1g

• realistic support and displacements

• installed ECAL masses



• 10,0 mm maximum deformation

• 50 times exaltation graphic



• ~360 N/mm² maximum tension

• 50 times exaltation graphic



conclusion:

• the static model is understood

• all values of stress and deformation are in a acceptable (safe) range










AHCAL Mechanicsabsorber structure (dynamic)

Absorber structure validation (earth quake)

not enough detailed Information for realistic simulation !



3 Hz -> swinging structure



7.6 Hz -> swinging submodules



24,5 Hz -> swinging interconnections



45 Hz -> swinging plates


AHCAL Mechanicsabsorber structure validation (dynamic)

conclusion:

• start with the modal analyses for the AHCAL absorber structure only

• the absorber plates starts to swing in a long frequency range

• the calculation time for single solutions are to long, we must think about the simplification of the 3D model

• we are far away to understand the overall behavior of the model

• the safe way would be, to validate the calculations with real structures

Documents

Status report AHCAL Mechanics Karsten Gadow CALICE Collaboration Meeting KEK, 19.04.2015 Studies of AHCAL absorber structure stability