Mechanical Engineering

# GabeRM

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1. ## Pendulum Hammer Impact Force Calculation

The document quality is pretty horrendous 😂
2. ## Pendulum Hammer Impact Force Calculation

For future reference for anyone that comes across this post or is interested in more information. I came across this paper from 1972 by EW Clements: https://apps.dtic.mil/dtic/tr/fulltext/u2/746444.pdf "Shipboard Shock and Navy Devices for its Simulation", which goes into detail and actually measures impact velocities, peak anvil acceleration, and other relevant information.
3. ## Pendulum Hammer Impact Force Calculation

I guess I really didn't search hard enough. Thanks for finding this! I noticed in the paper that it refers to it as MIL-DTL-901D and I was looking for 901e. The difference being that the 901e is the most recent updated version, I didn't think to look for 901d. Again, thanks for the help, it's very much appreciated. This definitely will help me.
4. ## Pendulum Hammer Impact Force Calculation

Picture of test machine for reference
5. ## Pendulum Hammer Impact Force Calculation

This particular test is MIL-DTL-901e. The information given within the standard is essentially what I have provided. No detailed drawings of the shock machine showing complete dimensions, no information on materials of the hammer/anvil, no spring coefficients, really no information to allow you to fully model this test. That is why I will settle for ballpark numbers. But I appreciate you taking the time to try to assist me in this problem. I will take a look at the link you suggested and see if I can produce some numbers. I appreciate your response. It definitely would be useful if there were some available values in the spec and if I had access to a machine to use an accelerator to get readings would be ideal, but I don't have access to one.
6. ## Pendulum Hammer Impact Force Calculation

Here's a video of this type of test being done for reference.
7. ## Pendulum Hammer Impact Force Calculation

That is correct. Not fixed, however it is limited to some x distance travel in the vertical direction. To clarify what I would like to calculate, it is the max G experienced by the anvil after impact. Does that clarify your question? This is ultimately a shock test to determine if whatever is placed on the anvil can withstand a high G value. Really only looking to know the max Gs experienced by the anvil. Honestly, the information I have is limited to what I've given, but I may be looking it at incorrectly or trying to figure out an answer that can't be obtained with the information given.
8. ## Pendulum Hammer Impact Force Calculation

Thank you for your reply. I will take a look at the source you've suggested. Thank you also for clarifying my confusion in the force/g mix-up. To answer your question, in this problem you can negate the friction from the bearing, air drag, etc. The hammer is released from a certain angle above the horizontal plane and it then swings and impacts on the bottom of the anvil. The anvil and hammer then separate, with the anvil traveling straight vertically and the hammer swinging back down and stopped with a brake. The anvil is free to travel upwards until it is stopped at some x distance. The parameters of this problem are very vague and the goal is to get an estimate of the g-value the anvil will experience in this set up.
9. ## Pendulum Hammer Impact Force Calculation

Hi all, I'm a bit embarrassed but I'm extremely rusty with a lot of engineering principles. I've mainly been working in automation and controls within a manufacturing setting and have not done anything like this in ages. Anyways, I have a problem I need to solve and I need to determine the impact force in Gs exerted on the Anvil table by the hammer in the attached image. Some guidance in how to solve this problem/sources of where I can find additional material to refresh on this is greatly appreciated. Thanks!!
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