Impact Load

By Deepak Yadav|Updated : October 14th, 2022

Before we go into Impact Load, let's first understand load. The force exerted on a surface or body is referred to as the load in engineering. Load and force are synonyms for the same physical quantity. N is the SI unit of load and force. However, the load is usually employed in engineering, whereas force is frequently seen in physics texts.

Impact load is defined as the force provided by a sudden load on a structural part instead of a constant and sustained force applied over a long period. Let's go through this briefly, along with the Impact stress formula derivation.

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Table of Content

What is Impact Load?

Machine members are sometimes subjected to load with a quick impact due to falling or slamming one object on another. The impact load is the load produced as a result of these actions. MSQ-based questions are formulated in the GATE question paper based on the impact load. The impact stress is the stress created in the machine members due to the impact load.

Impact Load GATE Study Notes

There are two application types: gradually and suddenly applied/impact loads. As previously stated, an impact load is created when one object collides with another.

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Impact Stress Derivation

Let's say

  • l = The bar's length.
  • 𝛿l = Bar deformation
  • E = Young's modulus of the bar's material.
  • h = The height from which the load falls.
  • A = The bar's cross-sectional area.
  • σi = Impact stress is created in the bar as a result of the impact load application.
  • P = The force that causes the deflection.

Then,

impact load

Impact Load Formula

Let us now see the derivation of the Impact Load formula for the GATE exam so that we build a strong base for our preparation. 

impact load

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Impact Load Example

If you throw your piano from the 20th-story window and it lands on the ground floor, the ground will be subjected to impact load; if you merely set the piano on the ground, the ground will be subjected to compressive load. The impact load is computed by dividing the overall kinetic energy dissipation by the local deformation. A few more examples important for the GATE ME exam are as follows:

  • Impact by people when running, jumping
  • falling with a tilting ladder
  • Impact of objects when dropped or in the process of being moved, for example, dishes, tools, furniture
  •  Impact of thrown objects.

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FAQs about Impact Load

  • Impact load is defined as the force provided by a sudden load on a structural part as opposed to a constant and sustained force applied over a long period of time.

  • A shock load is one method of introducing harmful vibrations into a system. An impact is a powerful force or shock delivered in a brief amount of time.

  • Impact strength, also known as impact toughness, is the amount of energy that a material can resist when a load is put suddenly on it. It is also known as the force per unit area threshold before the material fractures.

  • Machine members are sometimes subjected to load with a quick impact as a result of falling or slamming one object on another. The impact load is the load produced as a result of these actions.

  • In order to obtain a decent approximation of the maximum dynamic deflection and stress in static stress analysis, the static force (or weight of the mass) must be augmented by an "Impact Factor." The Impact Factor for vertical impacts is always larger than or equal to two for rigid elastic bodies.

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