Theoretical and Applied Fracture Mechanics最新文献_第2页

Weak interface-induced repeated kinking of a central crack in a brittle multilayered plate under remote shear loading 远程剪切加载下脆性多层板中心裂缝的弱界面诱导重复扭结

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-23 DOI: 10.1016/j.tafmec.2024.104732

{"title":"Weak interface-induced repeated kinking of a central crack in a brittle multilayered plate under remote shear loading","authors":"","doi":"10.1016/j.tafmec.2024.104732","DOIUrl":"10.1016/j.tafmec.2024.104732","url":null,"abstract":"<div><div>Understanding the repeated kinking pattern of cracks is essential for controlling the complex fracture trajectories in multilayered composites. While previous studies have explored many aspects of fractures in layered materials, the conditions governing the repeated kinking behavior under basic loading modes remain largely unrevealed. This research elucidates the continual kinking condition for a central crack in a brittle, multilayered plate with closely-parallel weak interfaces under remote shear stresses. Using the strain energy release rate (SERR) ratio criterion, we analytically derived a closed-form solution to the condition through the equivalent crack concept. The solution specifies a value domain for the intersection angle and fracture toughness ratio of weak interfaces, where the load-guided direction competes closely with the weak interface-guided direction to shape the crack trajectory into a repeated kinking pattern. Our theoretical results, validated by a series of finite element (FE) simulations, clarify how closely-parallel weak interfaces induce repeated crack kinking in multilayered materials under remote shear loading. This research paves the way for the deeper understanding of intricate crack trajectories under mixed loads in various practical applications.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532840","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 computationally efficient Element Edge point numerical integration scheme in the meshless method framework for solving fracture problems 无网格法框架下用于解决断裂问题的高效计算元素边缘点数值积分方案

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-23 DOI: 10.1016/j.tafmec.2024.104704

引用次数: 0

Effect of porosity gradient on fracture mechanics of bi-directional FGM structures: Phase field approach 孔隙率梯度对双向 FGM 结构断裂力学的影响：相场方法

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-23 DOI: 10.1016/j.tafmec.2024.104723

引用次数: 0

Improved probabilistic design method to quantify the fracture properties of roller compacted concrete 量化碾压混凝土断裂性能的改进型概率设计方法

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-23 DOI: 10.1016/j.tafmec.2024.104725

{"title":"Improved probabilistic design method to quantify the fracture properties of roller compacted concrete","authors":"","doi":"10.1016/j.tafmec.2024.104725","DOIUrl":"10.1016/j.tafmec.2024.104725","url":null,"abstract":"<div><div>In this paper, the material parameters pertaining to fracture properties of Roller Compacted Concrete (RCC) were evaluated using the boundary element method (BEM). The fictitious crack growth length <span><math><mrow><mi>Δ</mi><msub><mi>a</mi><mtext>fic</mtext></msub></mrow></math></span> is determined by the relative size <span><math><mrow><mrow><mo>(</mo><mi>T</mi><mo>-</mo><msub><mi>a</mi><mn>0</mn></msub><mo>)</mo></mrow><mo>/</mo><msub><mi>d</mi><mi>i</mi></msub></mrow></math></span>, while the individualized values of material parameters <span><math><mrow><mo>(</mo><msub><mi>K</mi><mtext>IC</mtext></msub><mo>&</mo><msub><mi>f</mi><mtext>t</mtext></msub><mo>)</mo></mrow></math></span> of RCC for different water-to-cement ratios were obtained. In this study, the three-parameter Weibull fracture statistical model was proposed for the first time to analyze the discreteness of these individualized values of material parameters <span><math><mrow><mo>(</mo><msub><mi>K</mi><mtext>IC</mtext></msub><mo>&</mo><msub><mi>f</mi><mtext>t</mtext></msub><mo>)</mo></mrow></math></span> of RCC. The statistical analysis minimum value of material parameters <span><math><mrow><mo>(</mo><msub><mi>K</mi><mtext>IC</mtext></msub><mo>&</mo><msub><mi>f</mi><mtext>t</mtext></msub><mo>)</mo></mrow></math></span> of each group is obtained. The failure curves of each group of RCC were predicted from the three-parameter Weibull fracture statistical model, and the simple calculation model for material parameters <span><math><mrow><mo>(</mo><msub><mi>K</mi><mtext>IC</mtext></msub><mo>&</mo><msub><mi>f</mi><mtext>t</mtext></msub><mo>)</mo></mrow></math></span> was validated. Further, a two-point design method was proposed for RCC material parameters <span><math><mrow><mo>(</mo><msub><mi>K</mi><mtext>IC</mtext></msub><mo>&</mo><msub><mi>f</mi><mtext>t</mtext></msub><mo>)</mo></mrow></math></span> with varying strengths and water-to-cement ratios.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554572","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

Dynamic tensile intralaminar fracture and continuum damage evolution of 2D woven composite laminates at high loading rate 高加载速率下二维编织复合材料层压板的动态拉伸层内断裂和连续损伤演化

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-22 DOI: 10.1016/j.tafmec.2024.104731

引用次数: 0

Characterisation of 18Ni 300 steel CT specimens in a fatigue test manufactured by selective laser melting at 0°, 45° and 90° 通过选择性激光熔化法在 0°、45° 和 90° 下制造的 18Ni 300 钢 CT 试样在疲劳试验中的特性分析

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-22 DOI: 10.1016/j.tafmec.2024.104730

{"title":"Characterisation of 18Ni 300 steel CT specimens in a fatigue test manufactured by selective laser melting at 0°, 45° and 90°","authors":"","doi":"10.1016/j.tafmec.2024.104730","DOIUrl":"10.1016/j.tafmec.2024.104730","url":null,"abstract":"<div><div>Maraging steel, 18Ni300, is a high-performance material that shows promising potential for various industrial applications. Selective Laser Melting is utilized in the manufacturing of high-value components. Understanding the fatigue mechanisms of this material is imperative, as its fatigue life is influenced by both surface and internal porosity, as well as defects produced when manufacturing the objects due to the patterns used. The main objective is to analyze the characterization of these pores and clarify their relationship with the fatigue properties of the material under study. Compact tension specimens were manufactured by selective laser melting at three angles (0°, 45° and 90°) with respect to the crack growing direction and fatigue tests were performed. A study of the porosity of the sample was conducted, which established a correlation between the printing angle, growing rate (da/dN curves), and the porosity that is categorised through the aspect ratio and the circularity ratio. It is shown that all manufacturing orientations generate similar pore sizes and area, but the 45° orientation induces pore with slightly higher circularity ratio. The results indicate that the faster fatigue crack growth might be linked to the slight increase in pore area and circularity, and this was observed for 45°.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stress evolution in rocks around tunnel under uniaxial loading: Insights from PFC3D-GBM modelling and force chain analysis 隧道周围岩石在单轴荷载作用下的应力演变：PFC3D-GBM 建模和力链分析的启示

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-21 DOI: 10.1016/j.tafmec.2024.104728

{"title":"Stress evolution in rocks around tunnel under uniaxial loading: Insights from PFC3D-GBM modelling and force chain analysis","authors":"","doi":"10.1016/j.tafmec.2024.104728","DOIUrl":"10.1016/j.tafmec.2024.104728","url":null,"abstract":"<div><div>In underground engineerings, the evolution of the stress state in the surrounding rocks can effectively reveal its fracture mechanism. To precisely describe this microscopic information, the present study utilizes the three-dimensional Grain-based model based on Particle Flow Code (PFC3D-GBM) to construct a square numerical specimen with a pre-existing hole representing a tunnel and subjected it to uniaxial loading. In this model, different types of mineral structures and internal force chain networks are distinguished at a three-dimensional scale. Furthermore, the evolution of force chain networks in the top, bottom, left and right regions around the tunnel is quantitatively characterized. The anti-fracture capability depending on stress state of various structures is calculated and then the fracture mechanism from the point of anti-fracture capability is discussed. The research results indicate that at at the beginning of loading, some red force chains with higher level have appeared on both sides of the tunnel. As the load goes on, red force chain network extending from both sides of the tunnel to the upper and lower ends of the specimen have emerged. The average value and sum value of all force chains show an increasing trend before the peak load and a decreasing trend after the peak load. The average value of force chains within a specific structure can accurately reflect the microscopic mechanical properties of that structure. The average values of force chains on the left and right sides of the tunnel are higher, both in terms of starting points and ascending rates, than those in the upper and lower regions of the tunnel. The orientation distribution of all force chains is relatively uniform, but force chains with higher level are generally align with the loading direction. The fundamental reason for the high degree of fragmentation on the left and right sides of the tunnel is that these regions bear more external load than the upper and lower regions, rather than being inherently more prone to fracture.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532845","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

Structural integrity of polymers processed by additive manufacturing techniques using residual strength diagrams 利用残余强度图分析通过增材制造技术加工的聚合物的结构完整性

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-20 DOI: 10.1016/j.tafmec.2024.104727

引用次数: 0

Influence of loading rate on the mode II fracture characteristics of SCC samples: Experiments and numerical simulations 加载速率对 SCC 样品模式 II 断裂特征的影响：实验和数值模拟

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-20 DOI: 10.1016/j.tafmec.2024.104729

{"title":"Influence of loading rate on the mode II fracture characteristics of SCC samples: Experiments and numerical simulations","authors":"","doi":"10.1016/j.tafmec.2024.104729","DOIUrl":"10.1016/j.tafmec.2024.104729","url":null,"abstract":"<div><div>This paper explores the influence of loading rate on mode II fracture failure in rock. Impact experiments were performed on samples of SCC at five different impact pressures via an SHPB system. This study reveals the correlations among the peak load, fracture toughness, and dynamic elastic modulus of rock mode II fractures under diverse loading rates, as well as the alterations in fracture trajectories. Simultaneously, PFC3D discrete element software has been adopted to numerically simulate the experiments and analysis of the fracture process of rocks and the variations in crack quantity and energy from a microscopic perspective. The results suggest that dynamic mode II fracture tends to increase as the loading rate increases and that the loading rate affects the fracture failure trajectory of a sample. Concurrently, as loading increased, the percentage of shear cracks in the samples gradually decreased, whereas the proportion of tensile cracks gradually increased, indicating that the samples experienced compressive stress after mode II fracture occurred at high loading rates. The proportion of energy absorbed by the samples for crack initiation and development, as well as the kinetic energy of the particles, initially tends to decrease but then increases with increasing loading rate, which is related to whether the loading rate generates secondary cracks. It is hypothesized that there exists a critical loading rate that triggers secondary cracks in SCC samples.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532842","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

On the relation between entropy and crack driving force 熵与裂缝驱动力的关系

IF 5 2区工程技术

Theoretical and Applied Fracture Mechanics Pub Date : 2024-10-19 DOI: 10.1016/j.tafmec.2024.104726

引用次数: 0