Failure Analysis of Nose Landing Gear Axle
An aircraft had experienced an accident and its nose landing gear and some other components were crushed. The left and right axles were found broken. To determine the loads that caused the axle to break a stress analysis was used and in addition the material was also metallurgically observed. The...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/41630 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | An aircraft had experienced an accident and its nose landing gear and some
other components were crushed. The left and right axles were found broken. To
determine the loads that caused the axle to break a stress analysis was used and in
addition the material was also metallurgically observed. The load could be calculated
using the following data, there were:
1. Type and size of fracture.
2. Dimension of component.
3. Strength of material.
It was found that the surface hardness of the axle is harder than the interior.
The heat treatment that has been experienced by the axle was quenching and
tempering. The hardness differential is due to that the different in cooling rate
between surface and the interior. The interior zone has experienced longer cooling
time than the surface, hence the carbon atom diffused outward to form carbide. On
surface the carbon atoms were trapped and forming a martensite phase.
From the stress analysis with mechanical classic method it is found that the
amount of load on nose landing gear axle was exceeding the static force that can
actually be accepted. The load is bigger than the aircraft weight itself, therefore it is
concluded that during landing the aircraft nose landing gear was touching the
runway in the first instance. |
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