Method for evaluating service life of exhaust system

The invention provides a life evaluation method for an exhaust system, which comprises the following steps of: performing a fatigue endurance test on a key structure part of the exhaust system, and fitting a structure life curve with set confidence and set reliability; performing a road spectrum acquisition test on the exhaust system, acquiring a strain load spectrum on the peripheral side of the key structure part of the exhaust system, and obtaining an alternating load spectrum through calibration; calculating a structural damage value of the key structural part of the exhaust system according to the obtained structural life curve and the alternating load spectrum; comparing the relationship between the structural damage value and the structural damage threshold value, if the structural damage value is greater than the structural damage threshold value, not passing the life evaluation, and if the structural damage value is less than or equal to the structural damage threshold value, passing the life evaluat