ORIGINAL RESEARCH article
Front. Aerosp. Eng.
Sec. Aircraft Materials and Structures
Volume 4 - 2025 | doi: 10.3389/fpace.2025.1604213
Accurate Prediction of Structural Degradation in Diesel Engine Cylinder Blocks Based on Component Scaling Methods
Provisionally accepted
- 1Beijing Institute of Technology, Beijing, China
- 2Weichai Power Co. Ltd, Weifang, Shandong Province, China
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This paper proposes a method that significantly improves the prediction accuracy of structural degradation in the main bearing wall of diesel engine cylinders. Firstly, based on the component scaling method, a scaling study is conducted on the main bearing wall to obtain a scaled model of the main bearing wall. By performing crack growth rate (da/dN) tests and threshold value (∆Kth) tests on the scaled model, accurate da/dN and ∆Kth data for the main bearing wall are indirectly obtained. Based on this, an accurate da/dN model for the main bearing wall, considering structural and load factors, is constructed, and the accuracy of the scaled model is verified by introducing standard single-edge notched bend (SENB) specimens for comparison. Secondly, based on the scaled model and the da/dN model measured from SENB specimens, structural degradation prediction studies are conducted on the main bearing wall, establishing two prediction models for the structural degradation of the main bearing wall. Finally, fatigue tests are conducted on the main bearing wall to verify the accuracy of the structural degradation prediction model built from the scaled model. Simultaneously, microscopic characterization studies are conducted on the fracture surface of the main bearing wall to determine the microscopic failure mechanism. Fatigue test verification shows that the fracture mode of the main bearing wall is primarily ductile fracture dominated by dimple fracture. The structural degradation prediction model for the main bearing wall built from the scaled model, which fully considers the structural and load factors of the main bearing wall, can more accurately reflect the structural degradation of the main bearing wall compared to traditional SENB specimens.
Keywords: Diesel engine cylinder block, structural degradation, structural and load factors, Crack growth rate model, Crack growth threshold, scaling method
Received: 01 Apr 2025; Accepted: 28 Aug 2025.
Copyright: © 2025 Huang, Xu, Liu and Fu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Weiqing Huang, Beijing Institute of Technology, Beijing, China
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