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FEAnalyst

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- How can I calculate impact force when impactor is in uniform circular motion and then hits the target?

Hi,

how can I calculate the impact force in case when some object is in uniform circular motion and then suddenly hits the target. For example consider lawn mower's blade hitting stone or drum woodchipper's blade hitting branch. Both blades are already moving at full speed when they hit the target. Which equations should I use? Formulas for tangent force in rotary motion do not seem applicable here. The simplest equations for impact force are ##F=m \cdot a## or ##F=\frac{m \Delta v}{\Delta t}##. But what value should I use for acceleration, ##\Delta v## and ##\Delta t## since the blade is already running at full speed? Do I have to know the decceleration occurring when the blade slows down after impact?

Thanks in advance for your help

how can I calculate the impact force in case when some object is in uniform circular motion and then suddenly hits the target. For example consider lawn mower's blade hitting stone or drum woodchipper's blade hitting branch. Both blades are already moving at full speed when they hit the target. Which equations should I use? Formulas for tangent force in rotary motion do not seem applicable here. The simplest equations for impact force are ##F=m \cdot a## or ##F=\frac{m \Delta v}{\Delta t}##. But what value should I use for acceleration, ##\Delta v## and ##\Delta t## since the blade is already running at full speed? Do I have to know the decceleration occurring when the blade slows down after impact?

Thanks in advance for your help