Evaluation of reliability of diesel engine connecting rod by accelerated test method

Nowadays, due to the competitive market, quality evaluation criteria at different stages of production are very important. One of these criteria is reliability, which is calculated using statistical evaluations of after-sales service data in most cases or with the help of accelerated tests at the early stage of the product development life cycle. In this research study, various accelerated test scenarios in proportion to the stresses on the diesel engine have been conducted to evaluate the lifetime of the connecting rod parts. The considered criterion for the reliability analysis is the time between failures which is evaluated after collecting and classifying the data using accelerated tests and confirming independent and uniform distribution of data via MIL-Hdbk, Laplace’s, and Anderson-Darling functions. Finally, the distribution diagram of reliability at different operating times was drawn using log-logistic statistical distribution, according to the best agreement with the experimental results. The results depicted that the reliability of the connecting rod would be equal to (0.99 @ 177417 hrs.) and (0.95@ 212753 hrs.) kilometers of cumulative operation, respectively, and after 448240 kilometers it would be less than 0.05.