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of another system, especially a computer program designed for that purpose
CFD Projects
CAE Projects
Customized Software Tools
Railway Transportation System
Design of Crash Buffer
Izod test
The Izod test has been modeled on Abaqus using the results of the actual test. The material has been calibrated by matching the energy absorbed during the Izod test. The material will be used with the crash analysis on actual model with crash buffer.
To model the Izod test, the test specimen and a striking hammer were modeled. The hammer was modeled as a rigid body having mass and velocity of an actual hammer just before the impact. The top and bottom surfaces of the test specimen were constrained as per actual conditions. Material properties were given as per the report of the test conducted on the material by Escorts. Then the material softening curve was modeled to represent the energy absorbed in the test.
Conclusion
It was concluded from the study that the present design of the shear plate does not meet the required force and time requirements. The shear plate is much weaker than the desired strength and breaks during the normal operation of the crash buffer and does not provide the peak as desired for the trigger mechanism for the crash buffer.
The simulation model for the crash simulation has been developed during the course of this project. Utilizing this simulation model the design of the shear plate can be modified to meet the desired loading conditions.
Objective
When two coaches collide with some velocity, the initial impact is taken by the crash buffers provided at the end of the coaches. The elastic spring, provided in the buffer, takes the initial load of the impact until the inner tube touches the back surface of the buffer. Some of the impact energy is taken by the spring and is stored in the form of potential energy. The reaction forces then start building up and when they reach a particular value, the shear plates fail by exhibiting a Mode II failure. This force value acts as a trigger mechanism for impact. Thereafter the buffer crushes further and the impact energy is absorbed by the buckling of the outer tube.
