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Modeling temperature dependence of tensile fracture strength for rocks considering phase transition and the direct effect of thermal damage 考虑相变和热损伤直接影响的岩石抗拉断裂强度温度依赖性模型
2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-12 DOI: 10.1177/10567895231196263
Ziyuan Zhao, Jianzuo Ma, Shifeng Zheng, Haibo Kou, Jun Qiu, Weiguo Li, Fangjie Zheng, Siyuan Lang
Accurately and conveniently acquiring the tensile fracture strength of rocks at different temperatures is vital no matter for the security or economical design of deep underground engineering projects. Extensive testing in the laboratory, assisted with fitting approaches, is the main method to obtain the high-temperature tensile fracture strength in the available literature. However, the high-temperature destruction test is difficult to conduct and requires numerous time and resources. In this work, considering the main physical mechanisms such as phase transition and thermal damage that affect the tensile fracture strength of rocks at high temperatures, theoretical models for predicting their temperature-dependent tensile fracture strength (TDTFS) are established based on the Force-Heat Equivalence Energy Density Principle. The presented models achieve great prediction on the different variation trends of tensile strength below and above the phase transition temperature, as well as the corresponding sudden change of strength. For rocks without phase transition, the presented model only needs some physical parameters tested at room temperature can get a good prediction capacity on the TDTFS. Moreover, a new theoretical characterization model of the equivalent thermal damage parameter was presented and take a comparison with the previous model. Finally, the potential applications and limitations of the TDTFS model are further discussed. The application threshold of the presented TDTFS models is relatively low, and they may therefore be suitable as a method for providing a rapid and preliminary evaluation of strength at a large temperature range for rock engineering.
准确、方便地获取岩石在不同温度下的抗拉断裂强度,对于深部地下工程的安全设计和经济设计至关重要。在现有文献中,在实验室中进行大量的测试,并辅以拟合方法,是获得高温拉伸断裂强度的主要方法。然而,高温破坏试验很难进行,需要大量的时间和资源。本文考虑了影响岩石高温拉伸断裂强度的相变和热损伤等主要物理机制,基于力-热等效能量密度原理建立了岩石高温相关拉伸断裂强度(TDTFS)理论模型。所提出的模型对相变温度以下和以上的拉伸强度变化趋势以及相应的强度突变有较好的预测效果。对于没有相变的岩石,该模型只需要在室温下测试一些物理参数,就可以获得较好的TDTFS预测能力。提出了一种新的等效热损伤参数理论表征模型,并与已有模型进行了比较。最后,进一步讨论了TDTFS模型的潜在应用和局限性。所提出的TDTFS模型的应用门槛较低,因此可以作为一种快速、初步评估岩石工程大温度范围强度的方法。
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引用次数: 0
A resilience assessment framework for microencapsulated self-healing cementitious composites based on a micromechanical damage-healing model 基于微力学损伤-愈合模型的微囊化自愈胶凝复合材料弹性评估框架
2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-11 DOI: 10.1177/10567895231197237
Kaihang Han, Jiann-Wen Woody Ju, Chengping Zhang, Dong Su, Hongzhi Cui, Xing-Tao Lin, Xiangsheng Chen
In this paper, a resilience assessment framework for microencapsulated self-healing cementitious composites is proposed based on a micromechanical damage-healing model. A 3D micromechanical analytical model is constructed to analyze the performance evolution during the damage-healing process of self-healing concrete. The resilience assessment of microencapsulated self-healing concrete is defined by virtue of the residual stiffness, self-healing effect on stiffness and damage cumulative on stiffness, which corresponds to three main features of resilience; namely, the robustness, recoverability and adaptability. The assessment results indicate that the release of healing agents within microcapsules and healing process of extended microcracks allows the microencapsulated self-healing concrete to have higher resilience than conventional concrete. Moreover, a parameter sensitivity analysis is conducted to investigate the influence of the healing efficiency, the applied initial damage and the fracture toughness of the repaired microcrack on resilience of microencapsulated self-healing concrete. The results indicate that higher healing efficiency and applied initial damage leads to high resilience, and fracture toughness of the repaired microcrack makes less difference to the results. The findings of this paper lay a theoretical foundation for the resilience design of self-healing material layer of underground structures.
基于微力学损伤-愈合模型,提出了微囊化自愈胶凝复合材料的弹性评估框架。建立了三维细观力学分析模型,分析了自愈混凝土损伤-愈合过程中的性能演变过程。微囊化自愈混凝土的回弹性评价是根据剩余刚度、自愈对刚度的影响和损伤累积对刚度的影响来定义的,对应于回弹性的三个主要特征;即鲁棒性、可恢复性和适应性。评价结果表明,微胶囊内愈合剂的释放和扩展微裂缝的愈合过程使得微胶囊化自愈混凝土具有比常规混凝土更高的回弹性。通过参数敏感性分析,研究了修复后微裂纹的修复效率、外加初始损伤和断裂韧性对微囊化自愈混凝土回弹的影响。结果表明,较高的修复效率和施加的初始损伤导致修复后的微裂纹具有较高的回弹率,修复后微裂纹的断裂韧性对修复结果影响较小。研究结果为地下结构自愈材料层的回弹设计奠定了理论基础。
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引用次数: 0
Seepage-stress combined experiment and damage model of rock in different loading and unloading paths 不同加卸载路径下岩石渗流-应力组合试验及损伤模型
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-05 DOI: 10.1177/10567895231193056
Zhi Zheng, Hongyu Xu, Wei Wang, Qiang Zhang, Yujie Wang, Qiancheng Sun, Honghui Tao, Xiaofeng Han
In the excavation of water-related underground projects such as hydropower and energy reserves, the surrounding rock surfers complex stress path and stress state redistribution, resulting in damage and failure under the hydro-mechanical coupling condition. However, the rock hydro-mechanical coupling characteristics under complex stress paths are unclear and corresponding theoretical models are scarce. In this study, a series of tests such as triaxial compression, unloading confining pressure and cyclic loading and unloading were carried out to study the effects of different stress paths, stress levels and seepage pressure on rock deformation, strength, failure and permeability. Based on test results, the damage evolutions under three different testing paths were analyzed, a new seepage-stress coupling statistical damage model which can better simulate the compaction stage is proposed. The prediction results of the proposed model under different stress paths are in good agreement with the experimental results. Under different stress paths, the fitting relationship between parameters R0 and n and σeff is similar and has good correlation.
在水电、能源储备等与水有关的地下工程开挖中,围岩在水-力耦合条件下产生复杂的应力路径和应力状态重分布,造成破坏破坏。然而,复杂应力路径下岩石的水-力耦合特性尚不清楚,相应的理论模型也很少。本研究通过三轴压缩、卸载围压、循环加卸载等一系列试验,研究了不同应力路径、应力水平和渗流压力对岩石变形、强度、破坏和渗透率的影响。在试验结果的基础上,分析了三种不同试验路径下的损伤演化规律,提出了一种能更好地模拟压实阶段的渗流-应力耦合统计损伤模型。该模型在不同应力路径下的预测结果与实验结果吻合较好。在不同应力路径下,参数R0、n与σeff的拟合关系相似,具有较好的相关性。
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引用次数: 0
An entropy-based failure prediction model for the creep process 基于熵的蠕变过程失效预测模型
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-04 DOI: 10.1177/10567895231194654
Zohreh Shirazi, Bijan Mohammadi
The creep process is a life-limiting degradation mechanism for many parts. Consequently, it should have been considered throughout the design process. This study aimed to assess the creep curve of Inconel 718 by designing a fixed blade profile. The finite element model has been done using ABAQUS software. The temperature distribution of the vane was calculated to assess the thermal stress on the vane. For temperature analysis, the film subroutine code was written. The creep life prediction model was evaluated using creep subroutine. This model included an entropy model based on the Boltzmann theory and continuum damage mechanics. Stress and temperature were applied at a range from 100 to 900 MPa and from 620 to 800°C, respectively. Finally, an accumulation damage parameter was computed. In this investigation, all three parts of the creep curve can be achieved simultaneously. There was good agreement between the simulations performed on a vane based on this method and the samples studied in previous research.
蠕变过程对许多零件来说是一种限制寿命的退化机制。因此,在整个设计过程中都应该考虑到这一点。本研究旨在通过设计固定叶片型线来评估Inconel 718的蠕变曲线。利用ABAQUS软件建立了有限元模型。计算叶片的温度分布,以评估叶片上的热应力。对于温度分析,编写了薄膜子程序代码。利用蠕变子程序对蠕变寿命预测模型进行了评估。该模型包括基于玻尔兹曼理论和连续损伤力学的熵模型。施加的应力和温度分别为100 ~ 900 MPa和620 ~ 800℃。最后,计算了累积损伤参数。在本研究中,蠕变曲线的三个部分可以同时得到。基于该方法的叶片模拟结果与以往的研究结果吻合较好。
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引用次数: 0
An encoder-decoder model with embedded attention-mechanism for efficient meshfree prediction of slope failure 一种具有嵌入式注意机制的编码器-解码器模型,用于边坡破坏的有效无网格预测
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-09-01 DOI: 10.1177/10567895231193053
Jun Chen, Dongdong Wang, Like Deng, Jijun Ying
The particle-based meshfree methods provide an effective means for large deformation simulation of the slope failure. Despite the advances of various efficient meshfree algorithmic developments, the computational efficiency still limits the application of meshfree methods for practical problems. This study aims at accelerating the meshfree prediction of the slope failure through introducing an encoder-decoder model, which is particularly enhanced by the attention-mechanism. The encoder-decoder model is designed to capture the long sequence character of meshfree slope failure analysis. The discretization flexibility of meshfree methods offers an easy match between the meshfree particles and machine learning samples and thus the resulting surrogate model for meshfree slope failure prediction has a quite wide applicability. In the meantime, the embedding of the attention-mechanism into the encoder-decoder neural network not only enables a significant reduction of the number of meshfree model parameters, but also maintains the key features of meshfree simulation and effectively alleviates the information dilution issue. It is shown that the proposed encoder-decoder model with embedded attention mechanism gives a more favorable prediction on the meshfree slope failure simulation in comparison to the general encoder-decoder formalism.
基于颗粒的无网格方法为边坡破坏的大变形模拟提供了有效手段。尽管各种高效的无网格算法取得了进展,但计算效率仍然限制了无网格方法在实际问题中的应用。本研究旨在通过引入一种编码器-解码器模型来加速边坡失稳的无网格预测,该模型特别得到了注意机制的增强。为了捕捉无网格边坡破坏分析的长序列特征,设计了编码器-解码器模型。无网格方法的离散化灵活性使得无网格粒子与机器学习样本之间的匹配更加容易,由此得到的替代模型对于无网格边坡破坏预测具有相当广泛的适用性。同时,将注意机制嵌入到编码器-解码器神经网络中,不仅可以显著减少无网格模型参数的数量,而且保持了无网格仿真的关键特征,有效缓解了信息稀释问题。结果表明,与一般的编码器-解码器形式相比,该嵌入注意机制的编码器-解码器模型对无网格边坡破坏模拟具有更好的预测效果。
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引用次数: 0
Theory and methods of constructing equations for the evolutionary damageability of materials 材料演化损伤性方程的理论与方法
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-08-01 DOI: 10.1177/10567895231191149
V. Fedorov
The theory and methods for constructing equations (functions) of evolutionary damage and rupture of materials in the Kachanov model (creep rupture and fatigue rupture) are presented. In general, it is proved that the factorized Kachanov model is identical to the Palmgren-Miner rule, which is often not confirmed experimentally. To construct damageability functions adequate to the experimental data, new mathematical objects (potential and normalized potential) are introduced. If the entire history of changes in the damage variable is known in experiments, then the use of the potential makes it possible to construct a damageability function of any complexity without integrating the evolutionary equation (explicit method). For cases where only rupture moments are recorded in experiments, a criterion for the adequacy of the normalized potential is formulated and an implicit method for its construction is developed. It is supplemented with a recursive algorithm that generates an unlimited number of such potentials. The implicit method is illustrated by examples, following which the reader can construct a damageability equation for his material without a thorough study of the theory.
介绍了在Kachanov模型(蠕变断裂和疲劳断裂)中构造材料演化损伤和断裂方程(函数)的理论和方法。通常,已经证明了因子化的Kachanov模型与Palmgren-Miner规则是相同的,这通常没有得到实验的证实。为了构造适合实验数据的损伤函数,引入了新的数学对象(势和归一化势)。如果损伤变量的整个变化历史在实验中是已知的,那么使用势能可以在不集成进化方程的情况下构建任何复杂度的损伤函数(显式方法)。对于在实验中只记录断裂力矩的情况,制定了归一化电势充分性的标准,并开发了其构造的隐式方法。它补充了一个递归算法,可以生成无限数量的这种势。通过实例说明了隐式方法,读者可以在不深入研究该理论的情况下,为其材料构建一个可损伤性方程。
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引用次数: 0
Experimental study on acoustic emission stress memory function of rock-like specimens under uniaxial compression 类岩石试件单轴压缩声发射应力记忆函数的实验研究
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-08-01 DOI: 10.1177/10567895231183008
Yong Tian, R. Yu, Fanxiu Chen, Fanzhen Meng, Zhaojun Zhang
The Kaiser effect in rock acoustic emission (AE) test is the most direct manifestation of rock memory function. This article focuses on the influence of different deformation stages and different historical stress conditions on stress memory function, and conducts AE testing of rock-like specimens. It explained the stress memory function in AE testing from the perspectives of crack propagation and damage accumulation. The crack initiation stress σci and crack damage stress σcd of specimens were obtained based on the stress-strain curve method, and the different deformation stages were divided. The damage evolution coefficient D e was proposed to measure the size of the stable development range of damage based on the normalized crack initiation and crack damage stress. The historical stress in the elastic stage could be easily identified from the Kaiser effect during the reloading process, even if the time interval reached 120 hours. The Felicity effect appeared during the reloading process when the historical stress was in the stage of stable crack propagation, and the FR value showed a decreasing trend with the extension of the time interval between loading tests. The loading history in the elastic stage was a training for the AE stress memory function under complex historical stress conditions, which restored the Kaiser effect in the stage of stable crack propagation. The distribution of AE events and CT scanning results were also analyzed in the article, and the damage accumulation information characterized by both are basically consistent. The double Kaiser effect phenomenon appeared in the AE test under complex historical stress conditions, although the criterion for discriminating the AE signal at the Kaiser effect point corresponding to the lower stress remained to be further studied and verified.
岩石声发射(AE)试验中的Kaiser效应是岩石记忆功能最直接的表现。本文重点研究了不同变形阶段和不同历史应力条件对应力记忆功能的影响,并对类岩试件进行声发射测试。从裂纹扩展和损伤积累的角度解释声发射试验中的应力记忆功能。基于应力-应变曲线法得到了试样的裂纹萌生应力σci和裂纹损伤应力σcd,并对不同变形阶段进行了划分。基于归一化裂纹起裂和裂纹损伤应力,提出了损伤演化系数D e来衡量损伤稳定发展范围的大小。在重新加载过程中,即使时间间隔达到120 h,也可以很容易地从Kaiser效应中识别出弹性阶段的历史应力。在加载过程中,当历史应力处于稳定裂纹扩展阶段时,出现费利西蒂效应,且随着加载间隔时间的延长,FR值呈减小趋势。弹性阶段的加载历史是对复杂历史应力条件下声发射应力记忆函数的训练,恢复了裂纹稳定扩展阶段的Kaiser效应。本文还对声发射事件的分布与CT扫描结果进行了分析,两者表征的损伤累积信息基本一致。在复杂的历史应力条件下,声发射试验中出现了双Kaiser效应现象,但在较低应力对应的Kaiser效应点处识别声发射信号的判据还有待进一步研究和验证。
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引用次数: 0
Numerical study on the effects of oblique impact on the ballistic behavior of 3D angle interlock woven fabric 斜向冲击对三维角互锁织物弹道性能影响的数值研究
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-12 DOI: 10.1177/10567895231187672
Q. Wei, Dan Yang, Zhongxiang Pan
3D angle interlock woven fabric(3DAWF) has great potential for impact protection. This paper investigates the ballistic mechanism of 3DAWF(5 layers of angle interlock – through the thickness) under normal and oblique impact. The full-size mesoscale model of 3DAWF under different impact directions and angles was established and systematically studied to reveal the 3DAWFs’ ballistic mechanism. The numerical studies of 3DAWF subjected to 0°, 15°, 30°, 45°, and 60° oblique impacts from two impact directions along 3DAWF structure configurations were carried out. We found that 3DAWFs’ ballistic performance increases non-linearly with impact obliquity. The ballistic mechanisms change with impact directions because of 3DAWFs’ anisotropic structure. This work also demonstrates the impact damage mechanism, energy absorption evolution, and stress wave distribution of the 3DAWF under oblique high-velocity impact. The findings are constructive for the 3DAWF applicated in ballistic protection.
三维角度互锁机织物(3DAWF)具有巨大的冲击防护潜力。本文研究了3DAWF(5层贯穿厚度的角度互锁)在法向和斜向冲击下的弹道机理。建立了三维AWF在不同撞击方向和角度下的全尺寸中尺度模型,并对其进行了系统的研究,以揭示三维AWF的弹道机制。对三维AWF结构在0°、15°、30°、45°和60°两个冲击方向上的斜向冲击进行了数值研究。我们发现,3DAWF的弹道性能随着撞击倾角的增加而非线性增加。由于3DAWF的各向异性结构,弹道机制随冲击方向的变化而变化。该工作还展示了3DAWF在斜向高速冲击下的冲击损伤机制、能量吸收演化和应力波分布。研究结果对3DAWF在弹道防护中的应用具有建设性意义。
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引用次数: 0
Strength reduction method for a factor of safety determination of damaged concrete structures 混凝土结构损伤安全系数确定的强度折减法
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-07-07 DOI: 10.1177/10567895231183469
D. Rakić, V. Dunić, M. Zivkovic, S. Radovanović, D. Divac, D. Sumarac
The paper presents the procedure for determining the factor of safety (FoS) using the strength reduction method (SRM) for the case of a concrete damage plasticity constitutive model. The SRM was originally used in a slope stability analysis and in its original form, this method was applied by reducing the shear strength of the material. Since damage in concrete occurs due to exceeding the normal stresses in the principal directions, and not due to exceeding the shear strength, this method was modified and adapted to the concrete damage plasticity constitutive model. Instead of reducing the failure surface, the parameters which describe the mechanical behavior in the case of uniaxial compression and uniaxial tension were reduced. In this way, the reduction of stress and the corresponding strain was carried out in the entire range of total strain, without changing the shape of the failure surface in the deviator plane. For the proposed methodology, a numerical algorithm was developed and implemented into the software PAK. The algorithm was verified through test examples and the obtained results were compared with analytically calculated FoS. The excellent agreement is observed between the FoS obtained by applying the proposed algorithm and the analytically calculated FoS.
本文介绍了在混凝土损伤塑性本构模型的情况下,使用强度折减法(SRM)确定安全系数(FoS)的程序。SRM最初用于边坡稳定性分析,在其原始形式中,该方法是通过降低材料的抗剪强度来应用的。由于混凝土中的损伤是由于超过主方向上的法向应力而发生的,而不是由于超过抗剪强度而产生的,因此对该方法进行了修改,并将其适用于混凝土损伤塑性本构模型。描述单轴压缩和单轴拉伸情况下力学行为的参数没有减少破坏面,而是减少了。通过这种方式,在不改变偏平面中失效面的形状的情况下,在总应变的整个范围内实现了应力和相应应变的减小。对于所提出的方法,开发了一种数值算法,并在PAK软件中实现。通过实例验证了该算法,并将所得结果与解析计算的FoS进行了比较。在应用所提出的算法获得的FoS与解析计算的FoS之间观察到极好的一致性。
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引用次数: 0
A nonlinear rheological shear constitutive model of bolted joints considering initial damage and damage evolution 考虑初始损伤和损伤演化的螺栓连接非线性流变剪切本构模型
IF 4.2 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2023-06-29 DOI: 10.1177/10567895231183468
Xing Zhang, Hang Lin, Huihua Hu, Yanhui Cheng, Wanyi Zhang
Understanding the shear mechanics mechanism of bolted joints is of great significance for predicting and preventing geological disasters. Most current studies seldom consider the rheological effects of bolted joints. In this paper, a comprehensive rheological constitutive model is proposed, accounting for initial damage and damage evolution across different rheological stages and bolt characteristics. The model incorporates an elastoplastic Hooke body for instantaneous deformation, parametric nonlinear Kelvin and viscous models for attenuation and steady creep stages, and a visco-plastic model based on time-dependent shear strength for accelerated creep stage. Additionally, a bolt-rock cooperative deformation model is introduced, considering the evolution of the bolt's elastic modulus. The resulting elasto-viscoplastic constitutive model effectively describes the shear rheological behavior of bolted joints, with its validity and superiority demonstrated through comparisons with shear creep tests and the Maxwell model. This research aims to provide valuable theoretical guidance for the construction and reinforcement of rock mass engineering projects.
了解螺栓连接的剪切力学机理对预测和预防地质灾害具有重要意义。目前的大多数研究很少考虑螺栓连接的流变效应。本文提出了一个综合流变本构模型,考虑了不同流变阶段的初始损伤和损伤演化以及螺栓特性。该模型包括用于瞬时变形的弹塑性Hooke体,用于衰减和稳定蠕变阶段的参数非线性Kelvin和粘性模型,以及用于加速蠕变阶段的基于时间相关剪切强度的粘塑性模型。此外,还引入了一个考虑锚杆弹性模量演变的锚杆-岩石协同变形模型。由此产生的弹粘塑性本构模型有效地描述了螺栓接头的剪切流变行为,通过与剪切蠕变试验和Maxwell模型的比较,证明了其有效性和优越性。本研究旨在为岩体工程的施工与加固提供有价值的理论指导。
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引用次数: 2
期刊
International Journal of Damage Mechanics
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