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- Help with calculation of impact force of a pendulum type rig.

Hi all,

I have just started work experience at an engineering company in the design department. I've be tasked to develop a test rig, Similar to a charpy rig. Intended to measure the impact strength of materials.

The design will consist of an A-frame structure with swing arm attached to the top axle, on the end of the swing arm is an anvil mass. The arm will swing and strike test pieces which are fixed to a solid, flat steel block fixed at the point of 0°

These numbers are just an example for the purpose of understanding how to do it and as accurately as possible.

Length of swing arm (inc anvil) =2m

Mass of anvil = 250kg

Size of anvil = 200x200x300mm

Mass of swing arm = 30kg

Starting position of swing arm = 90°

Strike point is 0°

Bearings on axle = 100mmOD.. 50mmID

Bearing friction = 0.002ų

Everything will be made from hardened

steel

My initial thought was the impact force wouldn't be overly difficult but after some research it seems to be much more complicated. I am beginning to think I've been setup with lack of information. Any help or advice on how to go about this problem/ what variables are missing would be much appreciated. Attached a rough sketch In case there's any confusion on the construction.

Many thanks

Jay

I have just started work experience at an engineering company in the design department. I've be tasked to develop a test rig, Similar to a charpy rig. Intended to measure the impact strength of materials.

The design will consist of an A-frame structure with swing arm attached to the top axle, on the end of the swing arm is an anvil mass. The arm will swing and strike test pieces which are fixed to a solid, flat steel block fixed at the point of 0°

These numbers are just an example for the purpose of understanding how to do it and as accurately as possible.

Length of swing arm (inc anvil) =2m

Mass of anvil = 250kg

Size of anvil = 200x200x300mm

Mass of swing arm = 30kg

Starting position of swing arm = 90°

Strike point is 0°

Bearings on axle = 100mmOD.. 50mmID

Bearing friction = 0.002ų

Everything will be made from hardened

steel

My initial thought was the impact force wouldn't be overly difficult but after some research it seems to be much more complicated. I am beginning to think I've been setup with lack of information. Any help or advice on how to go about this problem/ what variables are missing would be much appreciated. Attached a rough sketch In case there's any confusion on the construction.

Many thanks

Jay