Fatigue Life Prediction of 180 Ton Lifting Spreader Construction Material ST43 Using S-N Curve

Abstract

Lifting spreader construction with a maximum capability of 180 tons every day works by carrying transformer loads that vary up to maximum loads. The loads tested were 105 tons, 125 tons, 150 tons and 180 tonsThe tool not only experiences vertical tensile load but also experiences horizontal load due to acceleration or deceleration of the overhead crane. To prevent fracture due to fatigue, the lifting spreader needs to be analyzed its service life. Obtained data of mass transformers per year and construction specification will be dynamically analyzed using SAP2000 software to gain informationmaximum and minimum stress from each of its shell nodes. Data Collectionof stress will be processed through the S-N Curve mechanism and Palmsgren Miner rules to determine the cyclic load of the fatigue life plate of spreader. This analysis found that maximum capacity 180 tons value Sf above from endurance limit state. And the assessmentdecline fatigue life of the lifting spreader based data within 45 years. The researcher recommends a decrease in the value of the capacity till to 10 percent for things that are not expected that result in a decrease in the quality of construction.