Engineering Fracture Mechanics最新文献_第8页

A configurational stress-based model to predict mixed-mode fracture of rock under different environments

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-01 DOI: 10.1016/j.engfracmech.2025.110941

Chao Wang, Jili Feng

{"title":"A configurational stress-based model to predict mixed-mode fracture of rock under different environments","authors":"Chao Wang, Jili Feng","doi":"10.1016/j.engfracmech.2025.110941","DOIUrl":"10.1016/j.engfracmech.2025.110941","url":null,"abstract":"<div><div>This paper investigates mixed-mode fracture in rock under different environments. The principle of energy conservation provides a clear physical interpretation of the configurational stress tensor, revealing that its components represent the change in total energy induced by material element translation. The Mohr–Coulomb yield function is employed to define the boundary of crack-tip plastic zone. A novel configurational stress-based Mohr–Coulomb yield function is proposed, enhancing the accuracy of plastic zone size and shape assessment. Additionally, a fracture criterion is developed based on the local properties of the crack-tip plastic zone, and then the time factor of Burgers body is incorporated to elucidate the rheological fracture properties of rock. Utilizing this fracture criterion, the impacts of drying–wetting cycles, heating–cooling cycles, thermal treatment and chemical corrosion on rock fracture are investigated. The proposed fracture criterion accurately predicts crack initiation angles and fracture loads, aligning with predictions of the maximum tensile stress criterion and experiments. It is found that the fracture loads decrease with the number of drying–wetting and heating–cooling cycles. The crack-tip plastic zone is observed to expand over time, leading to a reduction in the fracture loading envelope. Furthermore, the fracture loading envelope generally decreases with increasing thermal treatment temperature, and the mixed-mode fracture resistance is the minimum in acidic environments. This paper provides a valuable reference for addressing the challenges of rock mixed-mode fracture under different environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110941"},"PeriodicalIF":4.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of crystal orientation on mechanical properties and stress distribution in monocrystalline sapphire

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-01 DOI: 10.1016/j.engfracmech.2025.110996

Xingyu Wang, Wen Zheng, Huixin Xing, Xiaoyu Bao, Qingliang Zhao, Yinchuan Piao

{"title":"Influence of crystal orientation on mechanical properties and stress distribution in monocrystalline sapphire","authors":"Xingyu Wang, Wen Zheng, Huixin Xing, Xiaoyu Bao, Qingliang Zhao, Yinchuan Piao","doi":"10.1016/j.engfracmech.2025.110996","DOIUrl":"10.1016/j.engfracmech.2025.110996","url":null,"abstract":"<div><div>The deformation behavior of monocrystalline materials is intricately linked to the anisotropic nature of their mechanical characteristics, slip motion, and cleavage motion. To systematically analyze the deformation and fracture behavior of monocrystalline sapphire and address existing shortcomings in the detection of its mechanical properties, we conducted a series of nanoindentation experiments and analyses across various crystal orientations of sapphire. A model for the stress field was developed by considering slip motion, cleavage fracture, and the mechanical properties of monocrystalline sapphire. Our findings indicate that cracks propagate in specific directions and exhibit anisotropic characteristics. The hardness and elastic modulus of sapphire across distinct planes follow the order: R < N < C < M < A, while the fracture toughness exhibits the opposite trend. Results concerning the stress field distribution, Schmid factor, and cleavage factor reveal that the M and A planes are more susceptible to brittle cracking and cleavage fracture, whereas the R and N planes are more likely to undergo plastic deformation.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110996"},"PeriodicalIF":4.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crack growth analysis of shear deformable plate under bending and tension

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-01 DOI: 10.1016/j.engfracmech.2025.110997

X.B. Yan, L. Ning, J.C. Wen, X. Li, P.H. Wen

引用次数: 0

Directional development mechanism of hard rock fracture under true triaxial stress: Insights from macroscopic and microscopic fracture perspectives

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-01 DOI: 10.1016/j.engfracmech.2025.111000

Liangjie Gu , Guo-Qiang Zhu , Shuo Yu , Yangyi Zhou , Yan Zhang , Yao Hu

{"title":"Directional development mechanism of hard rock fracture under true triaxial stress: Insights from macroscopic and microscopic fracture perspectives","authors":"Liangjie Gu , Guo-Qiang Zhu , Shuo Yu , Yangyi Zhou , Yan Zhang , Yao Hu","doi":"10.1016/j.engfracmech.2025.111000","DOIUrl":"10.1016/j.engfracmech.2025.111000","url":null,"abstract":"<div><div>The excavation of hard rocks in deep engineering frequently leads to disasters such as rockbursts, spallings, and collapses. Traditional triaxial tests, which neglect the effect of the intermediate principal stress, fail to reveal the failure mechanism of deep hard rocks. Under true triaxial stress, the intermediate principal stress inhibits volumetric deformation and expansion of rocks, resulting in directional failure. However, the fracture characteristics of hard rocks remain qualitative, lacking a mechanistic explanation. Therefore, based on true triaxial compression tests, complemented by acoustic emission and scanning electron microscopy, the directional development mechanism of hard rock fracture under true triaxial conditions is interpreted from both macroscopic and microscopic fracture perspectives. The macroscopic results show that as the intermediate principal stress increases and the minimum principal stress decreases, the macroscopic failure angle increases, the roughness of the rock failure surface decreases, and the fracture plane becomes increasingly perpendicular to the minimum principal stress, leading to the directional development of fractures. Microscopically, the development of microcracks is suppressed by the intermediate principal stress. As the intermediate principal stress increases and the minimum principal stress decreases, microcracks extend more severely in directions parallel to the intermediate principal stress, reducing intergranular fracture and increasing transcrystalline fracture and the proportion of tensile cracks. The differences in macroscopic deformation and microscopic tensile and shear fractures induced by true triaxial stress reveal the mechanism of directional rock fracture.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111000"},"PeriodicalIF":4.7,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimentally validated macro-mesoscopic simulation study on the fatigue short crack initiation and propagation in polycrystalline structure utilizing CP-XFEM

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110995

Bin Xie , Tianye Yu , Ruizhi Li , Zhongbing Luo , Konstantinos P. Baxevanakis , Ping Zhang

{"title":"Experimentally validated macro-mesoscopic simulation study on the fatigue short crack initiation and propagation in polycrystalline structure utilizing CP-XFEM","authors":"Bin Xie , Tianye Yu , Ruizhi Li , Zhongbing Luo , Konstantinos P. Baxevanakis , Ping Zhang","doi":"10.1016/j.engfracmech.2025.110995","DOIUrl":"10.1016/j.engfracmech.2025.110995","url":null,"abstract":"<div><div>The structural life assessment method based on short crack initiation and propagation is an important approach for predicting the fatigue life of engineering components. In this study, a macro-mesoscopic simulation method for short crack initiation and propagation in polycrystalline structures is developed utilizing the CP-XFEM approach. By incorporating random grain morphology and orientation, the model effectively captures the dispersion in crack initiation and propagation behaviors, including edge cracking, grain boundary cracking, and sub-surface cracking. The simulation uses the total cumulative plastic shear strain as the criterion for crack propagation and adopts the slip plane corresponding to the most active slip system to determine crack direction, accurately reflecting the slip-dominated propagation behavior of short cracks in Ni-based superalloys. The results demonstrate tortuous crack paths and fluctuating propagation rates along the slip direction. Comparison of simulation results with experimental data shows that the model predicts fatigue life with high accuracy, achieving error margins within 16% for verification group specimens. The alignment of life distribution between the test and verification groups further validates the reliability of this simulation approach for fatigue life prediction in engineering applications.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110995"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-temperature three-point bending fatigue test of laser repaired GH4169 superalloy based on BSL 3D DIC

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110968

Wei He , Mingming Xie , Mengqi Lei , Xing Sun , Lei Huang , Bo Liu , Huimin Xie , Jiaqiang Li , Qihong Fang

{"title":"High-temperature three-point bending fatigue test of laser repaired GH4169 superalloy based on BSL 3D DIC","authors":"Wei He , Mingming Xie , Mengqi Lei , Xing Sun , Lei Huang , Bo Liu , Huimin Xie , Jiaqiang Li , Qihong Fang","doi":"10.1016/j.engfracmech.2025.110968","DOIUrl":"10.1016/j.engfracmech.2025.110968","url":null,"abstract":"<div><div>Laser repair (LR) is an important branch of additive manufacturing and one of the core technologies in strategic emerging industries like equipment remanufacturing. Fatigue failure analysis of LR parts in service is the basis for an in-depth application of LR technology in aerospace, etc. The advanced digital image correlation (DIC) method can provide strong support due to its advantages such as full-field, non-contact, and in-situ deformation measurement. However, the extreme service environments and the non-uniformity of core LR structures bring challenges. This paper investigates the fatigue crack growth behavior of the LR nickel-based superalloy GH4169 at 650 °C using the high-temperature bi-prism-based single-lens (BSL) 3DDIC system, which primarily comprises a double telecentric lens, a bi-prism, and a CMOS camera equipped with a narrow bandpass filter. A fatigue-DIC synchronization technique and an automatic crack tip localization algorithm for numerous high-temperature DIC images are developed, which performs well even under crack branching conditions. Experimental results demonstrate that the automatic localization algorithm achieves an error within 5 % and a computational speed within 3 s per image, effectively addressing the aforementioned challenges and improving analysis efficiency. A new parameter named crack opening ratio (COR) is then applied for the crack closure effect characterization. The evolution laws of thecrack closure effect throughout the whole high-temperature fatigue process for pure substrate, pure deposited, and LR specimens are comparatively analyzed, and the influence of the LR interface on the crack growth behavior is clarified. Furthermore, as one major fatigue crack growth model, Paris’ law is modified by considering the crack closure effect.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110968"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High cycle fatigue limit assessment of foreign object damaged aerofoil blades considering the residual stress induced by impact 考虑到冲击引起的残余应力，对异物损坏的机翼叶片进行高循环疲劳极限评估

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110993

Chen Wang , Yibo Shang , Liucheng Zhou , Zhenhua Zhao , Xiaosheng Zhang , Lingfeng Wang , Bin Li , Weifeng He , Wei Chen

{"title":"High cycle fatigue limit assessment of foreign object damaged aerofoil blades considering the residual stress induced by impact","authors":"Chen Wang , Yibo Shang , Liucheng Zhou , Zhenhua Zhao , Xiaosheng Zhang , Lingfeng Wang , Bin Li , Weifeng He , Wei Chen","doi":"10.1016/j.engfracmech.2025.110993","DOIUrl":"10.1016/j.engfracmech.2025.110993","url":null,"abstract":"<div><div>Foreign object damage (FOD) is a critical factor that impacts the operational safety of aero-engine fan blades and is both frequent and inevitable. Therefore, it is necessary to develop an accurate high cycle fatigue (HCF) limit prediction model to enhance the reliability of assessment criteria for fan blades after FOD. Notch and residual stress are the key factors affecting HCF performance. In this paper, FOD tests were conducted to obtain notched airfoil blades and tested their HCF limits. Furthermore, the residual and vibration stress near the aerofoil blade notch were obtained by combining numerical simulation and experiments. The evolution of the residual stress was determined so that the actual stress field near the notch was accurately reconstructed, and the location of the dangerous point was obtained then, based on the theory of critical distance (TCD), an HCF limit prediction model was established and compared with the current Peterson and TCD models without considering residual stress. The results show that the TCD model considering residual stress can accurately predict the HCF limit of FOD aerofoil blades, with an error of 9.70 %±8.66 %, which is lower than the Peterson model (19.60 %±17.56 %) and the TCD model without residual stress (16.58 %±11.62 %).</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"318 ","pages":"Article 110993"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the tensile fracture behavior and failure criteria of domestic Zr-2.5Nb alloy under different stress triaxiality conditions

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110991

Xikai Xu , Zhiyi Wu , Chen Bao , Yupeng Cao , Guannan Zhao

{"title":"Investigation of the tensile fracture behavior and failure criteria of domestic Zr-2.5Nb alloy under different stress triaxiality conditions","authors":"Xikai Xu , Zhiyi Wu , Chen Bao , Yupeng Cao , Guannan Zhao","doi":"10.1016/j.engfracmech.2025.110991","DOIUrl":"10.1016/j.engfracmech.2025.110991","url":null,"abstract":"<div><div>The pressure tube (PT) is a critical component of the CANDU (CANada Deuterium Uranium) heavy water reactor, which imposes extremely high safety standards for its materials. This study investigates the tensile fracture behavior of unirradiated Zr-2.5Nb alloy, a domestically produced material for PTs, through a combination of experiments and finite element simulation. The full-range stress–strain relationship for this alloy was established using the finite-element-analysis aided testing (FAT) method. Based on the geometry of the tube, axial and transverse specimens were prepared and subjected to tensile testing. The deformation of the specimens at different stages was monitored, and the stress triaxiality was extracted through finite element simulation. The stress triaxiality distribution laws of the sheet specimens with notch in the direction of width (SNW) and the sheet specimen with a central hole (SCH) were analyzed. Additionally, the parameters of the Johnson-Cook (J-C) failure model were calibrated, and specimens with notches at different angles were designed for verification. The results showed that the Johnson-Cook failure model effectively simulates the tensile deformation and failure behavior of the domestic Zr-2.5Nb alloy. Fracture morphology was examined using scanning electron microscope (SEM), revealing the morphological characteristics of dimples, elongated dimples, and slip marks. The fracture modes of domestically produced Zr-2.5Nb alloy tensile specimens with different notches and orientations were obtained.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"318 ","pages":"Article 110991"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural feature-based physics-informed neural network for creep residual life prediction of P91 steel

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110989

Zhi Liu, Zhou Zheng, Peng Zhao, Jian-Guo Gong, Xiao-Cheng Zhang, Fu-Zhen Xuan

{"title":"Microstructural feature-based physics-informed neural network for creep residual life prediction of P91 steel","authors":"Zhi Liu, Zhou Zheng, Peng Zhao, Jian-Guo Gong, Xiao-Cheng Zhang, Fu-Zhen Xuan","doi":"10.1016/j.engfracmech.2025.110989","DOIUrl":"10.1016/j.engfracmech.2025.110989","url":null,"abstract":"<div><div>Creep residual life prediction of materials at elevated temperature is an important topic in the field of structural integrity. Traditional creep residual life prediction methods only consider mechanical parameters (e.g. stress, strain, temperature), while the microstructural features are rarely mentioned, reducing the prediction accuracy. In this work, taking the P91 steel as an example, a microstructural feature-based physics-informed neural network (PINN) for predicting creep residual life was developed by integrating the microstructural characteristics and mechanical parameters. The influence of microstructural features on the prediction results was discussed, and the prediction results of the proposed model and some conventional machine learning methods were compared. The effect of the strain data on creep residual life prediction results was included. The results indicated that the introduction of the microstructural evolution mechanisms (i.e. coarsening of precipitations and subgrain growth) could enhance the creep residual life prediction capacity of the proposed PINN model. The proposed PINN model outperforms the aforementioned traditional machine learning methods in predicting the creep residual life of materials. This model also exhibits excellent prediction performance without incorporating the creep strain data as an input feature, demonstrating the generalization ability and robustness of the proposed model.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110989"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel framework of neural network for notch fatigue life prediction by integrating self-attention mechanism and implicit physical constraints

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-02-28 DOI: 10.1016/j.engfracmech.2025.110994

Chenglong Yu , Qinzheng Yang , Xiaoan Hu

{"title":"A novel framework of neural network for notch fatigue life prediction by integrating self-attention mechanism and implicit physical constraints","authors":"Chenglong Yu , Qinzheng Yang , Xiaoan Hu","doi":"10.1016/j.engfracmech.2025.110994","DOIUrl":"10.1016/j.engfracmech.2025.110994","url":null,"abstract":"<div><div>Notch fatigue life prediction is critical aspect of structural integrity analysis. This study proposes a new neural network framework − Attention Physics-Informed Neural Network (AttPINN), integrating self-attention mechanism and implicit physical constraints with neural networks. The self-attention mechanism was integrated to extract hidden pattern in input data by allocating attention to input features automatically. Implicit physical constraints were introduced to capture nonlinear relationships between input data and fatigue life without any prior knowledge. For the training and validation datasets with five types of notches and a life range of 10<sup>3</sup>-10<sup>7</sup> cycles, the AttPINN predictions were within ± 2 scatter bands, while results from conventional machine learning model and traditional fatigue life equations were within ± 6 and even ± 15 scatter bands. Moreover, the prediction accuracies satisfy within the ± 3 scatter bands for test dataset. This study highlights that the self-attention mechanism significantly improves the neural network feature extraction and modeling efficiency. Implicit physical constraints enhance the generalization ability of the model, particularly for fatigue data with various notch geometries and materials. Results show that AttPINN significantly improved the prediction accuracy as well as generalization ability, making it a promising tool for notch fatigue evaluation.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110994"},"PeriodicalIF":4.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0