Shot Peening Equipments

By Crystals Group

Fri, Mar 31, 2017

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The difference and control in methods are related to shot size, coverage, striking angle and intensity. Any constituent (such as shaft, gears, connecting rods, propeller shaft, knuckle joints etc.) that undergo vacillating load or emphasis or power etc, undergoes an emphasis called as fatigue stress. Fatigue emphasis could be an alternative in load levels or complete emphasis-neutral- strain cycle or an emphasis- neutral or strain-neutral cycle. In short any constituents that undergo alternative in emphasis knowledge’s in fatigue emphasis.

Fatigue failure is a sudden failure with littlest indication or signs before the failure happen. That means detection of such failure can be hard and costlier. Mostly designers likely to design constituents with extra tolerance (particularly one which include human life with higher FOB) i.e. over-design the constituents so that it does not fail but Fatigue is a phenomena in which constituents encountering fatigue load can fail well below its yield emphasis.

Hence any constituents that are designed way above its loading capacity can fail if the loading is vacillating in nature. Thus when it comes to design of an aircraft constituent or Automotive or any constituent that have direct result to human, developers and designers pay carefully to material/constituent that encounter fatigue emphasis/loading. It’s a common understanding that all material/constituents exist of micro cracks (even if the constituent are tedious job, there are small micro cracks present in it), which are not visible for naked eyes, these can be visible with any micro- scope above 40X Zoom.

Now when material undergoes fatigue loading these micro cracks tends to join with other micro cracks to form macro cracks which can be visible to naked eyes if analyzed with extreme care. Further during service these macro cracks fails the material without any indication in a sudden fashion.

Now what shot peening does is when we hit or bombard the material/constituents with abrasives, a small dent or dimple is formed on the surface of the constituent. These dimples forces the micro cracks present on the material to close. Thus eliminating the root cause (micro cracks) from the material/component. No, eventually the components will fail but the cycle of failure when compared to non-shot peened material will be much higher approximately (200 – 2000%) depending on the constituent and application. i.e. is if a propeller shaft fails after ‘X’ cycle, by undergoing shot peening method the constituent life can be raised to 200 or more times the X cycle depending on the process.

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