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6016 合金 1

6016 铝合金 1

MnAl 1

三维 1

低合金高强度钢 1

双层辉光离子渗金属 1

固溶处理 1

应力应变模型 1

抗凹性能 1

无氢渗碳 1

时效硬化高速钢 1

有限层 1

横观各向同性 1

比奥固结 1

气雾化 1

永磁体 1

激光冲击 1

烘烤硬化 1

烘烤硬化性 1

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Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA

《结构与土木工程前沿（英文）》 2015年第9卷第4期页码 420-440 doi: 10.1007/s11709-015-0305-y

摘要： In this paper, elasto-plastic XFEM simulations have been performed to evaluate the fatigue life of plane crack problems in the presence of various defects. The stress-strain response of the material is modeled by Ramberg-Osgood equation. The von-Mises failure criterion has been used with isotropic hardening. The -integral for two fracture modes (mode-I and mode-II) is obtained by decomposing the displacement and stress fields into their symmetric and antisymmetric parts, then individual stress intensity factors are extracted from -integral. The fatigue life obtained by EPFM is found quite close to that obtained by LEFM.

关键词： XFEM von-Mises yield criterion isotropic hardening fatigue crack growth J-integral

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Strengthening of the concrete face slabs of dams using sprayable strain-hardening fiber-reinforced cementitious

《结构与土木工程前沿（英文）》 2022年第16卷第2期页码 145-160 doi: 10.1007/s11709-022-0806-4

摘要： In this study, sprayable strain-hardening fiber-reinforced cementitious composites (FRCC) were applied to strengthen the concrete slabs in a concrete-face rockfill dam (CFRD) for the first time. Experimental, numerical, and analytical investigations were carried out to understand the flexural properties of FRCC-layered concrete slabs. It was found that the FRCC layer improved the flexural performance of concrete slabs significantly. The cracking and ultimate loads of a concrete slab with an 80 mm FRCC layer were 132% and 69% higher than those of the unstrengthened concrete slab, respectively. At the maximum crack width of 0.2 mm, the deflection of the 80-mm FRCC strengthened concrete slab was 144% higher than that of the unstrengthened concrete slab. In addition, a FE model and a simplified analytical method were developed for the design and analysis of FRCC-layered concrete slabs. Finally, the test result of FRCC leaching solution indicated that the quality of the water surrounding FRCC satisfied the standard for drinking water. The findings of this study indicate that the sprayable strain-hardening FRCC has a good potential for strengthening hydraulic structures such as CFRDs.

关键词： strain-hardening cementitious composites engineered cementitious composites sprayable shotcrete strengthening concrete-face rockfill dam digital image correlation

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Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith

《结构与土木工程前沿（英文）》 doi: 10.1007/s11709-023-0003-0

摘要： Using an in situ lunar regolith as a construction material in combination with 3D printing not only reduces the weight of materials carried from the Earth but also improves the automation of lunar infrastructure construction. This study aims to improve the printability of a geopolymer based on a BH-1 lunar regolith simulant, including the extrudability, open time, and buildability, by controlling the temperature and adding admixtures. Rheological parameters were used to represent printability with different water-to-binder ratios, printing temperatures, and contents of additives. The mechanical properties of the hardening geopolymer with different filling paths and loading directions were tested. The results show that heating the printed filaments with a water-to-binder ratio of 0.32 at 80 °C can adjust the printability without adding any additive, which can reduce the construction cost of lunar infrastructure. The printability of the BH-1 geopolymer can also be improved by adding 0.3% Attagel-50 and 0.5% polypropylene fiber by mass at a temperature of 20 °C to cope with the changeable environmental conditions on the Moon. After curing under a simulated lunar environment, the 72-h flexural and compressive strengths of the geopolymer specimens reach 4.1 and 48.1 MPa, respectively, which are promising considering that the acceleration of gravity on the Moon is 1/6 of that on the Earth.

关键词： geopolymer lunar regolith simulant 3D printing rheology printability

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Seismic analysis of steel structures considering damage cumulation

SHEN Zuyan, WU Aihui

《结构与土木工程前沿（英文）》 2007年第1卷第1期页码 1-11 doi: 10.1007/s11709-007-0001-7

摘要： The research on the development of a reliable analytical model for seismic analysis of steel structures is presented. The non-linear damage cumulation hysteretic model incorporating the deterioration of stiffness, strength and strain hardening for structural steel is proposed and validated. The complete loading history, energy dissipation and the effect of the maximum plastic strain are taken into account in the model. The constants in the model are determined from regression analysis of experimental results of simple standard tensile and cyclic tests. Finite element formulations for beam and structural solid element considering the damage cumulation are derived. A computer program capable of calculating the hysteretic model of steel members, predicting the damage state and crack initiation, and carrying out non-linear time history seismic analysis of steel structures is developed. Solutions obtained from the model are in good agreement with experimental results. It was demonstrated that the damage cumulation effect is considerable and important in structural seismic analysis.

关键词： hardening regression analysis computer program cumulation hysteretic strength

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Topology optimization of transient problem with maximum dynamic response constraint using SOAR scheme

《机械工程前沿（英文）》 2021年第16卷第3期页码 593-606 doi: 10.1007/s11465-021-0636-4

摘要： This paper proposes a novel method for the continuum topology optimization of transient vibration problem with maximum dynamic response constraint. An aggregated index in the form of an integral function is presented to cope with the maximum response constraint in the time domain. The density filter solid isotropic material with penalization method combined with threshold projection is developed. The sensitivities of the proposed index with respect to design variables are conducted. To reduce computational cost, the second-order Arnoldi reduction (SOAR) scheme is employed in transient analysis. Influences of aggregate parameter, duration of loading period, interval time, and number of basis vectors in the SOAR scheme on the final designs are discussed through typical examples while unambiguous configuration can be achieved. Through comparison with the corresponding static response from the final designs, the optimized results clearly demonstrate that the transient effects cannot be ignored in structural topology optimization.

关键词： topology optimization solid isotropic material with penalization transient response aggregation function second-order Arnoldi reduction

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Stress-strain relationship with soil structural parameters of collapse loess

SHAO Shengjun, LONG Jiyong, YU Qinggao

《结构与土木工程前沿（英文）》 2008年第2卷第2期页码 151-160 doi: 10.1007/s11709-008-0020-z

摘要： Through the tri-axial shearing tests of unsaturated intact loess and based on the concept of comprehensive soil structural potential, this paper reveals the changing laws of soil structural property under the tri-axial stress conditions and establishes a mathematical expression equation of structural parameters, whereby reflecting the effects of unsaturated loess water content, stress and strain states, which is introduced into the shearing stress and shearing strain relation to obtain the structural stress-strain relation. The tests reveal that the loess dilatancy is of shearing contraction and shearing expansion, whereby indicating that there is a good linear relation between the stress ratio and shearing expansion strain ratio. The larger consolidation confining pressure is, the larger the stress of shearing contraction and expansion critical point is; and the larger water content is, the smaller the strain ratio of shearing contraction and expansion critical point is. Finally, the constitutive model is established to reflect the variation in loess structure, stress-strain softening and hardening, and shearing contraction and shearing expansion features. Through the comparative analysis, the stress-strain curves described by the constitutive relationship are found to be in good conformity with test results, whereby testing the rationality of the model in this paper.

关键词： hardening shearing expansion unsaturated structural property mathematical expression

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Effect of styrene-butadiene-styrene copolymer on the aging resistance of asphalt: An atomistic understanding from reactive molecular dynamics simulations

《结构与土木工程前沿（英文）》 2021年第15卷第5期页码 1261-1276 doi: 10.1007/s11709-021-0761-5

摘要： To reveal the potential influence of styrene-butadiene-styrene (SBS) polymer modification on the anti-aging performance of asphalt, and its mechanism, we explored the aging characteristics of base asphalt and SBS-modified asphalt by reaction force field (ReaxFF) and classical molecular dynamics simulations. The results illustrate that the SBS asphalt is more susceptible to oxidative aging than the base asphalt under oxygen-deficient conditions due to the presence of unsaturated C=C bonds in the SBS polymer. In the case of sufficient oxygen, the SBS polymer inhibits the oxidation of asphalt by restraining the diffusion of asphalt molecules. Compared with the base asphalt, the SBS asphalt exhibits a higher degree of oxidation at the early stage of pavement service and a lower degree of oxidation in the long run. In addition, SBS polymer degrades into small blocks during aging, thus counteracting the hardening of aged asphalt and partially restoring its low-temperature cracking resistance.

关键词： SBS asphalt oxidative aging asphalt hardening ReaxFF molecular dynamics

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Anisotropy of multi-layered structure with sliding and bonded interlayer conditions

Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU

《结构与土木工程前沿（英文）》 2020年第14卷第3期页码 632-645 doi: 10.1007/s11709-020-0617-4

摘要： A better understanding of the mechanical behavior of the multi-layered structure under external loading is the most important item for the structural design and the risk assessment. The objective of this study are to propose and develop an analytical solution for the mechanical behaviors of multi-layered structure generated by axisymmetric loading, and to investigate the impact of anisotropic layers and interlayer conditions on the multi-layered structure. To reach these objectives, first, according to the governing equations, the analytical solution for a single layer was formulated by adopting the spatial Hankel transform. Then the global matrix technique is applied to achieve the analytical solution of multi-layered structure in Hankel domain. The sliding and bonded interlayer conditions were considered in this process. Finally, the numerical inversion of integral transform was used to solve the components of displacement and stress in real domain. Gauss-Legendre quadrature is a key scheme in the numerical inversion process. Moreover, following by the verification of the proposed analytical solution, one typical three-layered flexible pavement was applied as the computing carrier of numerical analysis for the multi-layered structure. The results have shown that the anisotropic layers and the interlayer conditions significantly affect the mechanical behaviors of the proposed structure.

关键词： multi-layered structure Hankel transformation anisotropic transversely isotropic interlayer condition Gauss-Legendre quadrature

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New model of load transfer function for pile analysis based on disturbed state model

LIU Qijian, YANG Linde, WU Jun

《结构与土木工程前沿（英文）》 2007年第1卷第4期页码 443-447 doi: 10.1007/s11709-007-0060-9

摘要： Based on the disturbed state concept (DSC), a new model of load transfer function for pile analysis is established by the idea that the deformed material between pile and soil can be treated as a mixture of two constituent parts, which are in intact or critical state and assumed to obey random distribution. Starting from the homogenization theory of heterogeneous materials and statistics method, a parameter to describe the disturbance degree is proposed, and a formula to determine the parameter has been derived by using the plastic displacement of a pile as distribution variable. In the model, shear intensity of elements in an intact state are simulated by Duncan-Zhang model and that in a critical state by Mohr-Coulomb criterion. The model of this paper has few parameters, which can reflect the aspects of load transfer function, such as hardening, softening and the effects of confining pressure. The well agreement between the in-situ data and the predicted shows that the validity of the model herein. So the proposed model in this paper is easy to be used in engineering practice.

关键词： hardening homogenization displacement engineering Duncan-Zhang

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横观各向同性土体三维比奥固结有限层解法

梅国雄,宰金珉,赵维炳,殷建华

《中国工程科学》 2004年第6卷第7期页码 43-47

摘要：

建立了三维横观各向同性土体固结的有限层求解方法，并编制了相应的计算程序；通过2个算例的分析对比，验证了计算方法和程序的正确性；探讨了横观各向同性地基参数对三维地基固结的影响，给出了对工程有价值的相关计算图表和结论。

关键词：有限层比奥固结三维横观各向同性

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高强度合金抗疲劳应用技术研究与发展

越振业

《中国工程科学》 2005年第7卷第3期页码 90-94

摘要：

评述了超高强度钢、高强度A1合金和Ti合金表面完整性抗疲劳应用技术的研究和发展。高强度合金疲劳性能对应力集中敏感，不适当的加工工艺和切削热等造成的表面损伤和髙拉应力使其疲劳和应力腐蚀性能损失殆尽。先进的表面完整性加工尤其是表面改性可显著提高疲劳性能，如激光冲击使7475-T761拉-拉疲劳寿命提高约89%，7075-T6裂纹扩展速率降低到原来的1/1500;超声喷丸使超高强度钢低周疲劳强度提高约50%，Ti7A14Mo合金髙周疲劳强度提高约15%;表面超硬化可使Vasco X-2M齿轮钢接触疲劳寿命提高30～35倍等。

关键词：高强度合金表面完整性激光冲击表面超硬化

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6016铝合金热处理工艺研究

张钧萍,金庆生,马鸣图

《中国工程科学》 2014年第16卷第1期页码 103-107

摘要：

通过硬度测试、力学性能测试和烘烤硬化性能测试，研究了6016 铝合金冷轧板材的热处理工艺，结果表明：合金的硬度随着固溶温度升高和固溶时间延长而增加；合金进行预时效处理时，随着预时效时间的增加硬度出现先降低后升高的现象，且预时效温度越高，硬度下降值越大；在本试验条件下，满足覆盖件性能要求的6016合金的热处理工艺为：540 ℃×20 min固溶水淬+120 ℃×10 min预时效处理。

关键词： 6016 合金固溶处理预时效处理烘烤硬化

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材料的一种新型应力应变模型

张于贤,王红

《中国工程科学》 2007年第9卷第8期页码 88-91

摘要：

为研究自增强超高压容器的残余应力，提出了一个新型的应力应变模型，该模型比别的模型更接近于自增强超高压容器用钢的实际工作情况；以某材料为例介绍了确定该新型模型的方法，并对其误差进行了分析，论述了由一般的拉伸曲线求解该新型的应力应变关系模型的可行性及可靠性。

关键词：低合金高强度钢自增强应力应变模型硬化参数

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铝合金板材抗凹性能研究

张钧萍,马鸣图,方刚,金庆生

《中国工程科学》 2014年第16卷第1期页码 108-112

摘要：

通过力学性能测试、烘烤硬化性能测试和抗凹性能测试，研究了用于制备汽车覆盖件的6016 铝合金板材的抗凹性能以及抗凹性与材料力学性能和烘烤硬化性能之间的关系。结果表明：6016 铝合金板材经两年自然时效后，其强度略有增加，加工硬化指数n 值和延伸率增大；板材在不同温度条件下经30 min烘烤后强度增加，烘烤硬化值随着温度升高而显著增加，表现出良好的烘烤硬化性能；板材的抗凹性能与烘烤工艺有关，烘烤温度越高，烘烤后材料的屈服强度越高，板材的抗凹性能越好。

关键词： 6016 铝合金烘烤硬化性抗凹性能

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快速球磨法高效实现各向同性气雾化MnAl 粉的纳米化制备 Article

J. Rial, E.M. Palmero, A. Bollero

《工程（英文）》 2020年第6卷第2期页码 172-176 doi: 10.1016/j.eng.2019.03.013

摘要：

为了提高永磁体性能尤其是矫顽力，对气雾化MnAl粉末首次进行了30 s短时间球磨。结果表明，如此短的处理时间加上随后的退火可以高效地得到纳米结构和可控的相变。球磨过程中产生的微应变引起的缺陷与退火过程中形成的β相共同起到钉扎中心的作用，从而提高了矫顽力。研究表明，为了在磁化强度和矫顽力之间达到折中，在铁磁性τ-MnAl相和β相的形成之间找到一个平衡是很重要的。球磨（30 s）和退火后获得的矫顽力高达4.2 kOe (1 Oe = 79.6 A·m^–1)，与早期文献报道的球磨时间超过20 h时的矫顽力相当。球磨后粉末的退火温度降低了75 ℃，矫顽力提高了2.5倍，而退火后的气雾化材料的剩磁基本保持不变，为合成各向同性的MnAl基粉末开辟了一条新的途径。

关键词：永磁体纳米结构相变 MnAl 气雾化球磨法

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标题作者时间类型操作

Elasto-plastic fatigue crack growth analysis of plane problems in the presence of flaws using XFEM

Sachin KUMAR,A. S. SHEDBALE,I. V. SINGH,B. K. MISHRA

期刊论文

Strengthening of the concrete face slabs of dams using sprayable strain-hardening fiber-reinforced cementitious

期刊论文

Printability and hardening performance of three-dimensionally-printed geopolymer based on lunar regolith

期刊论文

Seismic analysis of steel structures considering damage cumulation

SHEN Zuyan, WU Aihui

期刊论文

Topology optimization of transient problem with maximum dynamic response constraint using SOAR scheme

期刊论文

Stress-strain relationship with soil structural parameters of collapse loess

SHAO Shengjun, LONG Jiyong, YU Qinggao

期刊论文

Effect of styrene-butadiene-styrene copolymer on the aging resistance of asphalt: An atomistic understanding from reactive molecular dynamics simulations

期刊论文

Anisotropy of multi-layered structure with sliding and bonded interlayer conditions

Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU

期刊论文

New model of load transfer function for pile analysis based on disturbed state model

LIU Qijian, YANG Linde, WU Jun

期刊论文

横观各向同性土体三维比奥固结有限层解法

梅国雄,宰金珉,赵维炳,殷建华

期刊论文

高强度合金抗疲劳应用技术研究与发展

越振业