Structural Failure Analysis of a Small Foamed Asphalt Mixture Mixer

Foamed asphalt is the main means of achieving largescale road repairs. Small foam asphalt mixture mixers arc necessary test equipment before the road construction process. To avoid serious injuries due to equipment failure, the structural reliability of the mixer is analyzed using failure mode and effects analysis (FMEA) and fault tree analysis (FTA), Foamed asphalt is a metastable state product, and the mixer operation requires immediate and efficient operation, which results in a relatively complicated structure of the device. Potential faults are easily overlooked in reliability analyses of mixer systems. For FMEA, the familiarity proportionality coefficient should be introduced to ensure accurate ranking of the risk priority numbers and to reduce potential bias due to subjective evaluations by personnel. For FTA. the bottom event with the lowest probability of failure is removed while the bottom event with the smallest risk priority numbers and correlations are combined. The obtained FMEA table and structural fault tree model can improve the accuracy of the risk priority numbers, effectively reduce the workload of the reliability analysis, and obtain the structural reliability with less data.