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关键词

应力 3

应力状态 3

残余应力 3

DX桩 2

应力波 2

强度理论 2

有限元 2

D1 turnover / photoinhibition / photoprotection / photosynthesis / tomato / xanthophyll cycle 1

EFP 1

H2S应力腐蚀 1

LED灯具；加速老化测试；中位寿命；滑动平均误差 1

TC4钛合金 1

k-ε模型 1

一维应力波 1

三向受力状态 1

三塔悬索桥 1

不等围压 1

临界应力 1

临震信号 1

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Fatigue and impact analysis and multi-objective optimization design of Mg/Al assembled wheel considering rivetingresidual stress

《机械工程前沿（英文）》 2022年第17卷第3期 doi: 10.1007/s11465-022-0701-7

摘要： The multi-material assembled light alloy wheel presents an effective lightweight solution for new energy vehicles, but its riveting connection remains a problem. To address this problem, this paper proposed the explicit riveting-implicit springback-implicit fatigue/explicit impact sequence coupling simulation analysis method, analyzed the fatigue and impact performance of the punching riveting connected magnesium/aluminum alloy (Mg/Al) assembled wheel, and constructed some major evaluation indicators. The accuracy of the proposed simulation method was verified by conducting physical experiments of single and cross lap joints. The punching riveting process parameters of the assembled wheel joints were defined as design variables, and the fatigue and impact performance of the assembled wheel was defined as the optimization objective. The connection-performance integration multi-objective optimization design of the assembled wheel considering riveting residual stress was designed via Taguchi experiment, grey relational analysis, analytic hierarchy process, principal component analysis, and entropy weighting methods. The optimization results of the three weighting methods were compared, and the optimal combination of design variables was determined. The fatigue and impact performance of the Mg/Al assembled wheel were effectively improved after optimization.

关键词： magnesium/aluminum assembled wheel riveting residual stress fatigue analysis impact analysis multi-objective optimization

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The formation mechanism and the influence factor of residual stress in machining

null

《机械工程前沿（英文）》 2014年第9卷第3期页码 265-269 doi: 10.1007/s11465-014-0311-0

摘要：

Residual stresses generated in cutting process have important influences on workpiece performance. The paper presents a method of theoretical analysis in order to explicate the formation mechanism of residual stresses in cutting. An important conclusion is drawn that the accumulated plastic strain is the main factor which determines the nature and the magnitude of surface residual stresses in the workpiece. On the basis of the analytical model for residual stress, a series of simulations for residual stress prediction during cutting AISI 1045 steel are implemented in order to obtain the influences of cutting speed, depth of cut and tool edge radius on surface residual stress in the workpiece. And these influences are explained from the perspective of formation mechanism of residual stress in cutting. The conclusions have good applicability and can be used to guide the parameters selection in actual production.

关键词： residual stress analytical model strain plastic cutting parameter

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Improved analytical model for residual stress prediction in orthogonal cutting

null

《机械工程前沿（英文）》 2014年第9卷第3期页码 249-256 doi: 10.1007/s11465-014-0310-1

摘要：

The analytical model of residual stress in orthogonal cutting proposed by Jiann is an important tool for residual stress prediction in orthogonal cutting. In application of the model, a problem of low precision of the surface residual stress prediction is found. By theoretical analysis, several shortages of Jiann’s model are picked out, including: inappropriate boundary conditions, unreasonable calculation method of thermal stress, ignorance of stress constraint and cyclic loading algorithm. These shortages may directly lead to the low precision of the surface residual stress prediction. To eliminate these shortages and make the prediction more accurate, an improved model is proposed. In this model, a new contact boundary condition between tool and workpiece is used to make it in accord with the real cutting process; an improved calculation method of thermal stress is adopted; a stress constraint is added according to the volume-constancy of plastic deformation; and the accumulative effect of the stresses during cyclic loading is considered. At last, an experiment for measuring residual stress in cutting AISI 1045 steel is conducted. Also, Jiann’s model and the improved model are simulated under the same conditions with cutting experiment. The comparisons show that the surface residual stresses predicted by the improved model is closer to the experimental results than the results predicted by Jiann’s model.

关键词： residual stress analytical model orthogonal cutting cutting force cutting temperature

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Multiscale model of micro curing residual stress evolution in carbon fiber-reinforced thermoset polymer

Xinyu HUI, Yingjie XU, Weihong ZHANG

《机械工程前沿（英文）》 2020年第15卷第3期页码 475-483 doi: 10.1007/s11465-020-0590-6

摘要： In this study, the micro curing residual stresses of carbon fiber-reinforced thermoset polymer (CFRP) composites are evaluated using a multiscale modeling method. A thermochemical coupling model is developed at the macroscale level to obtain the distributions of temperature and degree of cure. Meanwhile, a representative volume element model of the composites is established at the microscale level. By introducing the information from the macroscale perspective, the curing residual stresses are calculated using the microscale model. The evolution of curing residual stresses reveals the interaction mechanism of fiber, matrix, and interphase period during the curing process. Results show that the curing residual stresses mostly present a tensile state in the matrix and a compressive state in the fiber. Furthermore, the curing residual stresses at different locations in the composites are calculated and discussed. Simulation results provide an important guideline for the analysis and design of CFRP composite structures.

关键词： CFRP curing residual stress multiscale modeling finite element method

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decouple the contributions of friction and plastic deformation to machined surface temperatures and residualstress patterns in finish dry cutting

Subhash ANURAG, Yuebin GUO,

《机械工程前沿（英文）》 2010年第5卷第3期页码 247-255 doi: 10.1007/s11465-010-0097-7

摘要： Temperature on the machined surface is critical for surface integrity and the performance of a precision component. However, the temperature of a machined surface is challenging for in-situ measurement. Furthermore, the individual contribution of tool/work friction and plastic deformation of work materials to surface temperature is very difficult to quantify because the measured temperature is always the resultant temperature. This lack of understanding on the temperature distribution blocks the design of effective cutting tool geometries and materials to minimize surface temperature. This study provides a finite element method based on a predictive model to decouple the contributions of tool/work friction and material plastic deformation to surface temperature in a dry cutting process. The study shows that the plastic deformation of work material contributes to the majority of surface temperature, whereas the tool/work friction contribution is secondary. High temperatures are produced when more materials are plowed under the cutting edge. A large tool/work friction leads to higher surface temperatures, and the use of a cutting tool with physical properties in process simulation significantly improves the accuracy of predicted surface temperatures. Residual stress reversal from subsurface maximum residual to surface maximum residual stress may occur when tool/work friction increases.

关键词： surface temperature friction residual stress finite element analysis (FEA) dry cutting tool property

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石化特种设备中的硫化氢应力腐蚀与残余应力

张亦良,徐金泉,王羽辞

《中国工程科学》 2009年第11卷第8期页码 38-43

摘要：

针对石化特种设备中硫化氢（H₂S）应力腐蚀问题现状，综合比较了国际权威机构NACE，EFC以及ISO发布的最新标准、规范，对H2S应力腐蚀的环境界定、试验方法、影响因素、应力腐蚀评价准则及对材料的要求等做了扼要的综述。同时对焊接残余应力的产生、测定方法、消除措施等进行了论述，列举了实际参与研究的发生应力腐蚀容器的实例及残余应力的影响。

关键词： H2S应力腐蚀规范指南评价准则焊接残余应力

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An improved algorithm for McDowell’s analytical model of residual stress

null

《机械工程前沿（英文）》 2014年第9卷第2期页码 150-155 doi: 10.1007/s11465-014-0295-9

摘要：

The analytical model for two-dimensional elastoplastic rolling/sliding contact proposed by McDowell is an important tool for predicting residual stress in rolling/sliding processes. In application of the model, a problem of low predicting precision near the surface layer of the component is found. According to the volume-constancy of plastic deformation, an improved algorithm for McDowell’s model is proposed in order to improve its predicting accuracy of the surface residual stress. In the algorithm, a relationship between three normal stresses perpendicular to each other at any point within the component is derived, and the relationship is applied to McDowell’s model. Meanwhile, an unnecessary hypothesis proposed by McDowell can be eliminated to make the model more reasonable. The simulation results show that the surface residual stress predicted by modified method is much closer to the FEM results than the results predicted by McDowell’s model under the same simulation conditions.

关键词： residual stress McDowell’s model volume-constancy of plastic deformation FEM elastoplastic rolling/sliding contact

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Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked

Xiaobo REN, Odd M. AKSELSEN, B?rd NYHUS, Zhiliang ZHANG

《结构与土木工程前沿（英文）》 2012年第6卷第3期页码 217-223 doi: 10.1007/s11709-012-0169-3

摘要： Welding residual stress is one of the main concerns for fabrication and operation of steel structures due to its potential effect on structural integrity. This paper focuses on the effect of welding residual stress on the ductile crack growth resistance of circumferentially cracked steel pipes. Two-dimensional axi-symmetry model has been used to simulate the pipe. Residual stresses were introduced into the model by using so-called eigenstrain method. The complete Gurson model has been employed to calculate the ductile crack growth resistance. Results show that residual stresses reduce the ductile crack growth resistance. However, the effect of residual stresses on ductile crack growth resistance decreases with the increase of crack growth. The effect of residual stress has also been investigated for cases with different initial void volume fraction, material hardening and crack sizes.

关键词： residual stress ductile crack growth resistance complete Gurson model eigenstrain method

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基于变形力监测数据的残余应力场推断和表征方法

赵智伟, 刘长青, 李迎光, James Gao

《工程（英文）》 2023年第22卷第3期页码 49-59 doi: 10.1016/j.eng.2022.07.018

摘要：

残余应力是材料的基本属性之一，与零件的几何/尺寸稳定性和疲劳寿命直接相关。针对具有高精度要求的大型零件，其残余应力场的准确测量和预测一直是一个挑战。目前的残余应力场测量技术分为基于应变的有损法以及效率和精度较低的无损法。本文提出了一种基于变形力推断残余应力场的无损法。本方法通过能够反映去除材料后不平衡残余应力场整体效应的变形力来推断零件的残余应力场。利用虚功原理建立了变形力与残余应力场之间的力学关系，并引入正则化方法求解残余应力场。为验证方法的有效性，本文进行了理论验证和实际实验验证。实验结果表明，该方法对于大型结构件的残余应力场测量具有可靠的精度和灵活性。在数字化和智能制造的趋势下，该方法的基本原理为利用加工监测数据预测和补偿由残余应力引起的零件加工变形提供了重要参考。

关键词：残余应力场精密加工变形力反问题在位测量

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铝合金AA5182-O自冲摩擦铆焊与自冲铆接工艺比较研究 Article

马运五, 山河, 牛嗣哲, 李永兵, 林忠钦, Ninshu Ma

《工程（英文）》 2021年第7卷第12期页码 1741-1750 doi: 10.1016/j.eng.2020.06.015

摘要：

本文分别采用自冲铆接（SPR）和自冲摩擦铆焊（F-SPR）工艺连接铝合金AA5182-O。从接头宏观形貌、铆接力、显微硬度分布、准静态力学性能和疲劳性能等方面对两个工艺进行了系统比较。研究结果表明，FSPR工艺不仅在铆钉与板材之间形成了机械互锁，而且还实现了固相连接；而SPR工艺仅实现了机械互
锁。F-SPR 工艺在摩擦热软化的作用下，获得相同机械互锁所需的铆接力比SPR工艺降低了63%。随着F-SPR 模式转换深度的降低，铆钉周围铝合金加工硬化程度增加。当模式转换深度小于3.0 mm时，FSPR接头比SPR接头具有更高的铝合金硬度。F-SPR 接头中的固相连接和较高的铝合金硬度有效提升了接头的刚度和抗剪切能力，从而使接头的准静态拉剪强度和疲劳寿命与SPR接头相比均有显著提升。

关键词：自冲铆接自冲摩擦铆焊机械连接准静态强度疲劳

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激光相变热处理对TC４电子束焊缝残余应力的影响

鲁金忠,张永康,孔德军,任旭东,邹世坤,王西昌

《中国工程科学》 2007年第9卷第5期页码 72-76

摘要：

利用CO₂激光相变热处理技术对TC4钛合金电子束焊缝进行了处理，研究了激光功率、光斑直径、辅助气体等激光工艺参数对电子束焊缝残余应力分布的影响。实验结果表明，激光相变热处理改善了焊缝残余应力的分布，使焊缝表面残余应力由拉应力转变为压应力，其压应力值随着激光功率的增加而增大，随着激光光斑直径的减小而增加；辅助气体为O₂时残余压应力值比辅助气体为N₂大30～40MPa，激光相变热处理显著提高了TC4钛合金电子束焊缝的残余压应力及其使用寿命。

关键词：激光相变热处理 TC4钛合金电子束焊缝残余应力

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TA2板料激光热应力弯曲成形及其力学性能研究

周益军,张永康,游文明

《中国工程科学》 2007年第9卷第10期页码 40-44

摘要：

用HVS-1000显微硬度测试仪、X-350A型X射线应力测定仪，以2.5 kW SM2000SM快轴流CO₂激光器对0.6 mm厚的TA2板料进行扫描，按照正交试验理论安排成形工艺参数，研究了TA2板料弯曲成形时主要工艺参数对弯曲角度的影响，以及试样表面残余应力的分布和试样断面上的显微硬度变化。结果表明：正交试验中的4个工艺参数的作用是不同的，按其变化对弯曲变形量影响的大小排序，依次是扫描次数、光斑直径、激光束功率、扫描速度；成形参数对试样表面的残余应力分布也存在一定的影响；试样变形区断面上的显微硬度变化呈现出一定的规律。

关键词：激光技术热应力板料弯曲成形残余应力显微硬度

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Application of metal magnetic memory test in failure analysis and safety evaluation of vessels

Yiliang ZHANG, Song YANG, Xuedong XU

《机械工程前沿（英文）》 2009年第4卷第1期页码 40-48 doi: 10.1007/s11465-009-0003-3

摘要： Metal magnetic memory test (MMMT), which is a new subject in the field of nondestructive examination, can determine regions of stress concentration by testing the distribution of the magnetic field of metal structures so as to effectively diagnose premature defects. MMMT and other test methods are applied in the study to put a propylene purifier of a temperature-jump accident and a leaked ammonia vessel through safety evaluation. Results are as follows: The margin of safety declines after the purifier is overburnt; several stress concentrations are observed within the overburnt area and the level of stress concentration rises after one-month operation; and overpressure operation of the purifier must be strictly avoided and carefully monitored during later operation. Cracks are observed on the ammonia vessel after one year’s service. Extremely high residual stress is the primary cause of cracks. After four years in service, the residual stresses existing in the area of the base metal and weld zone are still greater than 0.5 , which results in numerous cracks due to stress corrosion. From the MMMT result of the ammonia vessel’s defects, it can be seen that the derivative of magnetic density (d p/d ) is an important reference variable. Within the 31 leakage points, 67.7% of them whose dHp/dx values are more than 10, and 96.8% of them whose dHp/dx values are more than 8.

关键词： Metal magnetic memory test (MMMT) nondestructive testing (NDT) residual stress propylene purifier ammonia vessel

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金属板料激光喷丸成形新技术

周建忠,张兴权,王广龙,杨超君,张永康

《中国工程科学》 2005年第7卷第11期页码 94-97

摘要：

激光喷丸塑性成形金属板料是从激光强化发展起来的新技术。当激光诱导冲击波的峰值超过材料的动态屈服极限时，板料冲击区的表层发生微观塑性变形，导致了板料厚度方向上不均勻应力分布，使板料发生宏观变形。不同的激光脉冲参数在板料内部产生不同的残余应力，不同的残余应力使板料发生不同的变形，通过控制喷丸的工艺参数来控制板料内部应力场的精确分布，就可实现板料的精确变形。其显著特点是成形精确，且表层留有有益的残余压应力。

关键词：激光喷丸成形金属板料残余应力

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Secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams

Lizhao DAI; Wengang XU; Lei WANG; Shanchang YI; Wen CHEN

《结构与土木工程前沿（英文）》 2022年第16卷第3期页码 388-400 doi: 10.1007/s11709-022-0809-1

摘要： An experimental study is performed on five post-tensioned concrete beams to explore the effects of different fracture positions on secondary transfer length and residual prestress of fractured strand. A numerical model is developed and used to predict the secondary transfer length and residual prestress of fractured strand in post-tensioned concrete beams. The model change interaction, which can deactivate and reactivate the elements for simulating the removal and reproduction of parts of the model, is used to reproduce the secondary anchorage of fractured strand. The numerical model is verified by experimental results. Results shows that the fractured strand can be re-anchored in concrete through the secondary anchorage, and the secondary transfer length of fractured strand with the diameter of 15.2 mm is 1133 mm. The residual prestress of fractured strand increases gradually in the secondary transfer length, and tends to be a constant beyond it. When the fractured strand is fully anchored in concrete, a minor prestress loss will appear, and the average prestress loss is 2.28% in the present study.

关键词： post-tensioned concrete beams strand fracture secondary transfer length residual prestress