Crack Path Control Method Based On Image Recognition And Development Of Software

Due to the aging,damage of materials or the rapid change of external environment,engineering components often fracture easily.Fracture is one of the main failure modes of materials,and the presence of cracks will greatly reduce the mechanical properties of engineering components,which will even bring a serious threat to property and life.When cracks occur in mechanical equipment,if effective control measures are not taken,cracks propagation may damage important precision areas or critical process structures in the mechanical equipment,and accelerate the failure of the equipment.Therefore,when the components of the mechanical equipment cannot be replaced in time,it is the great significance to study the crack propagation control method to ensure the operation of the mechanical equipment for a short time and to slow down the failure of the equipment.This paper uses the ABAQUS simulation platform,and optimizes the best arrangement method of holes to achieve the crack propagation control based on the optimization algorithm theory and crack path image recognition method,thus the crack control problem is turned into the structural optimization problem,the specific work content is as follows:(1)the optimization model is combined with the optimization algorithm,and the single-object optimization algorithms and the multi-objective optimization algorithms are introduced to solve the path control problems of the single crack and multiple cracks.Then,the Ramberg-Osgood stress-strain constitutive relationship is used to analyze the elastoplastic fracture mode,and the solver of extended finite element method in the finite element software ABAQUS is applied to the numerical simulation of the hole model.(2)In order to improve the accuracy of the analysis and calculation for crack hole model,the ABAQUS script file was developed a second time,and the automatic division method of the complex model grid unit was proposed by using the structured technology.(3)In order to solve the problem that the crack path is difficult to quantify in postprocessing,this paper proposes a crack path coordinate extraction scheme based on image recognition.This scheme uses a threshold segmentation algorithm to extract the path pixels of the cracks image in the simulation result file,and combines the discontinuity of different cracks to recognize the multiple cracks pixels.The physical coordinates of the corresponding pixels are obtained with the principle of coordinate conversion.In addition,the crack path image recognition scheme was detected by using the test image,and the accuracy of the scheme in extracting the crack coordinates was verified.(4)In order to achieve the closed-loop optimization of the crack control method based on image recognition,this article uses the ABAQUS graphical interface tool and the secondary development toolkit to develop a simple and intuitive user interface.The software is a plug-in running in the ABAQUS/CAE environment,which can provide crack control methods under different problems according to user needs.At the same time,the developed software is used to perform functional tests on single cracks a nd multiple cracks in two dimensional and three dimensional examples.The results show that the arrangements of holes provided by the developed software can e ffectively control the propagation of single and multiple cracks,and avoid the destruction of the key areas and structures successfully.