Fatigue Life Estimation for Welds of Truck Frames for Rolling Stock Using Stress Frequency in Service Load

Effects of Vehicle Running Conditions on Stress Frequency Distribution of Welds on Truck Frames for Railway Rolling Stock

“…In the case of calculating equivalent stress according to the modified Miner's rule and evaluating fatigue life, as shown in a former report (1) , m can be assumed as 5.5. This numerical value comes from evaluation of rolling stock truck frames using the results of discussion on the distribution situation of stress frequency and the evaluation of fatigue life using previous examples of damage in actual situations (1) (5) .…”

“…We took the characteristics of stress distribution caused by service loads in previous running tests and assessed the feasibility of estimating stress frequency distribution by roughly applying the maximum stress estimated by the design load at the design stage (referred to below as the design stress) (1) . The validity of fatigue life estimation was also investigated in consideration of examples of past damage using the equivalent stress per 10 km obtained from the stress frequency caused by service loads.…”

Fatigue Life Estimation of Welds on Truck Frames for Rolling Stock Based on Stress Frequency Caused by Service Loads

“…This chapter examines the possibility of estimating fatigue life for welds on truck frames in stress measurement positions A -H at the toe of the weld and at a, b and c on the solid surface near the weld using the equivalent stress per 10 kmσ eq/10 km calculated from the accumulated stress frequency caused by service loads, and the running distance at which cracks occurred from previous examples of damage (13) .…”

Fatigue Life Estimation of Welds on Truck Frames of Rolling Stock Based on Stress Frequency Distribution

“…The value calculated using m=3 seems to be the closest to σ max in all calculations. This chapter examines the possibility of estimating fatigue life of welds on truck frames at stress measurement positions A − H located at the toe of the weld and at the positions a, b and c on the solid surface near the weld, using the equivalent stress per 10 km σ eq/10km calculated from the accumulated frequency of stress caused by service loads, and the running distance at which cracks occurred in past examples of damage [13].…”