![]() ![]() We know that in a standard lifting environment the dynamic factor is seldom more than 1.5 and never more than 2 – why? Because a 2 times WLL proof load is such a common requirement in lifting tackle standards. So - if someone lifts a 1000kg payload with a WLL 1000kg sling, we aren’t at all surprised to measure a peak force of more than 1000kgf. They quantify the increase in the force experienced by our sling. This varies depending upon the crane type, the mass of the payload, and how the two are operated. But for standard cranes in a standard lifting environment we’ll expect something in the range of 1.1 times or 1.5 times the force due to gravity. How much is this amplification? Well, this can vary. This gives us dynamic amplification of the forces in our slings. This acceleration is added to the acceleration of gravity that is already there. Well, we know that we accelerate our payloads when we use our crane. It usually does this within a time frame we can measure in seconds (or fractions of seconds). The payload itself goes from a speed of zero to whatever the hoist speed of the crane ends up being. We start with something down low and raise it up off the ground by accelerating it with a crane. Dynamic loadingĪll lifting involves acceleration. More precisely, it is the application of load at a higher rate than has been accommodated in the design of the equipment. The application of a load at a very high rate. ![]() Wednesday, 28 August 2019 What is shock loading? ![]()
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