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| Crack Propagation Law of Barrel Coating under Thermal Mechanical Cyclic Load |
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| DOI：10.7643/issn.1672-9242.2022.07.004 |
| KeyWord:coating barrel crack propagation XFEM CZM method thermal stress |
| Author | Institution |
| LI Qiang |
College of Mechatronics Engineering, North University of China, Taiyuan , China |
| ZOU Li-bo |
College of Mechatronics Engineering, North University of China, Taiyuan , China |
| RAN Xiang-chen |
College of Mechatronics Engineering, North University of China, Taiyuan , China |
| ZHAO Chao |
College of Mechatronics Engineering, North University of China, Taiyuan , China |
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| Abstract: |
| The falling off of the coating is an important factor affecting the service life of the barrel. To improve the service life of the barrel, the propagation mechanism of the coating crack of the barrel is studied. Aiming at the crack damage of barrel chromium layer, a method based on extended finite element method (XFEM) and cohesion model (CZM) is proposed. The thermal mechanical coupling finite element model of coating barrel is established. The temperature field is introduced into the finite element model in the way of indirect coupling. In addition, the strength and damage criterion of the interface between coating and substrate are simulated by CZM constitutive model. The initial crack of the coating extends to the coating/substrate interface under thermal stress load. Under the circumstance of high temperature and high pressure, the initial crack propagation speed of the coating is very fast, and it extends to the substrate joint surface after the completion of the first shot. When the initial crack extends to the coating/substrate interface, the existence of the crack tip makes the location have a large shear stress, up to 1 180 MPa, resulting in the cracking of the coating joint surface under the condition of continuous shooting. Under high temperature and high pressure load, the initial crack of the coating quickly extends to the coating/substrate interface, furthermore, the thermal stress borne by the barrel coating is an important factor leading to the cracking of the coating. |
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