Ming-yong Jia, Fei Chen, Lei Zhang, Zhifeng Huang, Q. Shen
To join dissimilar metals with large differences in characteristics, such as molybdenum (Mo) and stainless steels (SS), is essential to take full advantage of their combined performances. In this work, Mo and SS304 have been jointed with Ni interlayer by using a diffusion bonding technique at different bonding temperatures. The results show that a MoNi brittle intermetallic compound is easy to form in the interface of the Mo/SS304 joint with increasing the bonding temperature, which will reduce the shear strength of the joint because a crack is easy to form between Mo and the intermetallic compounds. Meanwhile, Mo/SS304 joints have also been prepared by using NixCu1-x (x=0.45, 0.24, or 0) as an interlayer. The result shows that reducing Ni content can avoid the formation of intermetallic compounds, and the fracture occurs between the interlayer and Mo diffusion zone far away from the Mo side. This work shows that the fracture properties of the Mo/SS304 joint can be modified by changing the composition of the interlayer. The best shear strength of the Mo/SS304 joint is 140 MPa. This work is important for providing an effective approach to join Mo and SS304 using a low-temperature diffusion bonding method.
{"title":"Interfacial Microstructure and Mechanical Behavior of Low-Temperature Diffusion Bonded Mo/SS304 Joints Using Ni xCu 1-x Interlayers","authors":"Ming-yong Jia, Fei Chen, Lei Zhang, Zhifeng Huang, Q. Shen","doi":"10.2139/ssrn.3834115","DOIUrl":"https://doi.org/10.2139/ssrn.3834115","url":null,"abstract":"To join dissimilar metals with large differences in characteristics, such as molybdenum (Mo) and stainless steels (SS), is essential to take full advantage of their combined performances. In this work, Mo and SS304 have been jointed with Ni interlayer by using a diffusion bonding technique at different bonding temperatures. The results show that a MoNi brittle intermetallic compound is easy to form in the interface of the Mo/SS304 joint with increasing the bonding temperature, which will reduce the shear strength of the joint because a crack is easy to form between Mo and the intermetallic compounds. Meanwhile, Mo/SS304 joints have also been prepared by using Ni<sub>x</sub>Cu<sub>1-x</sub> (x=0.45, 0.24, or 0) as an interlayer. The result shows that reducing Ni content can avoid the formation of intermetallic compounds, and the fracture occurs between the interlayer and Mo diffusion zone far away from the Mo side. This work shows that the fracture properties of the Mo/SS304 joint can be modified by changing the composition of the interlayer. The best shear strength of the Mo/SS304 joint is 140 MPa. This work is important for providing an effective approach to join Mo and SS304 using a low-temperature diffusion bonding method.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90240213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Existing research on Doubly fed Induction Generator (DFIG) short-circuit current studies are based on hypothesis the rotor current is zero when the Crowbar is input after the fault, which ignores the impact of rotor current attenuation process. It would bring the error to the calculation results. To solve this problem, on the basis of analyzing variation process of DFIG’s transient equivalent potential and the influence of rotor current attenuation process, the flux is calculated accurately. An accurate calculation equivalent model for DFIG short-circuit current is proposed. With the RTDS, an experiment platform with physical controller of converter is founded, the proposed model is validated. The effect of short circuit current to wind farms transmission line is studied, and an improved protection scheme is put forward.
{"title":"An Improved Fault Current Calculation Method and Protection Scheme of Doubly-Fed Induction Generator","authors":"Jun Yin","doi":"10.2139/ssrn.3873132","DOIUrl":"https://doi.org/10.2139/ssrn.3873132","url":null,"abstract":"Abstract Existing research on Doubly fed Induction Generator (DFIG) short-circuit current studies are based on hypothesis the rotor current is zero when the Crowbar is input after the fault, which ignores the impact of rotor current attenuation process. It would bring the error to the calculation results. To solve this problem, on the basis of analyzing variation process of DFIG’s transient equivalent potential and the influence of rotor current attenuation process, the flux is calculated accurately. An accurate calculation equivalent model for DFIG short-circuit current is proposed. With the RTDS, an experiment platform with physical controller of converter is founded, the proposed model is validated. The effect of short circuit current to wind farms transmission line is studied, and an improved protection scheme is put forward.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85288841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, the absorption, particularly at higher frequencies, is significantly enhanced, resulting in a broader absorption bandwidth. By raising the temperature of strontium titanate, the center absorption frequency shifts to higher frequency and the bandwidth increases. At a Fermi energy of 1 eV and temperature of 400 K, the device exhibits an ultra-broad bandwidth of 3.36 THz and remarkable peak absorption exceeding 99%. Moreover, the absorber is insensitive to incident angles, maintaining a stable broad-bandwidth beyond 3.3 THz within a large incident angle of 55° and 50° for TE and TM polarizations, respectively. The physical mechanisms are elucidated by the impedance matching theory and electric field analyses. The structure shows great potential in tunable broadband terahertz absorbers and related applications.
{"title":"A Dual-Tunable Ultra-Broadband Terahertz Absorber Based on Graphene and Strontium Titanate","authors":"Jiali Wu, Xin Yan, X. Yuan, Yang'an Zhang, Xia Zhang","doi":"10.2139/ssrn.3927081","DOIUrl":"https://doi.org/10.2139/ssrn.3927081","url":null,"abstract":"An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, the absorption, particularly at higher frequencies, is significantly enhanced, resulting in a broader absorption bandwidth. By raising the temperature of strontium titanate, the center absorption frequency shifts to higher frequency and the bandwidth increases. At a Fermi energy of 1 eV and temperature of 400 K, the device exhibits an ultra-broad bandwidth of 3.36 THz and remarkable peak absorption exceeding 99%. Moreover, the absorber is insensitive to incident angles, maintaining a stable broad-bandwidth beyond 3.3 THz within a large incident angle of 55° and 50° for TE and TM polarizations, respectively. The physical mechanisms are elucidated by the impedance matching theory and electric field analyses. The structure shows great potential in tunable broadband terahertz absorbers and related applications.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87368430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Liu, Said El Chamaa, M. Wenman, C. Davies, F. Dunne
Hydride formation in zircaloy-4 under cyclic thermomechanical loading has been investigated using characterized notched beam samples in four-point beam testing, and microstructurally-representative crystal plasticity modelling of the beam tests which incorporates an atomistically-informed thermodynamically-equilibrium model for hydrogen concentration. The model provided the locations within the microstructure of high hydrogen content, above that required for saturation, hence predicting the anticipated locations of hydride observations in the experiments. The strain rate sensitivity of this alloy over the temperature range considered led to considerable intragranular slip and corresponding stress redistribution, and cyclic strain ratcheting leading to high hydrostatic stresses and in turn hydrogen concentrations, which explains the locations of experimentally observed hydride formation. The interstitial hydrogen interaction energy as well as the intragranular geometrically necessary dislocation density were shown to be important in controlling the spatial distributions of observed hydrides.
{"title":"Hydrogen Concentration and Hydrides in Zircaloy-4 During Cyclic Thermomechanical Loading","authors":"Yang Liu, Said El Chamaa, M. Wenman, C. Davies, F. Dunne","doi":"10.2139/ssrn.3828268","DOIUrl":"https://doi.org/10.2139/ssrn.3828268","url":null,"abstract":"Hydride formation in zircaloy-4 under cyclic thermomechanical loading has been investigated using characterized notched beam samples in four-point beam testing, and microstructurally-representative crystal plasticity modelling of the beam tests which incorporates an atomistically-informed thermodynamically-equilibrium model for hydrogen concentration. The model provided the locations within the microstructure of high hydrogen content, above that required for saturation, hence predicting the anticipated locations of hydride observations in the experiments. The strain rate sensitivity of this alloy over the temperature range considered led to considerable intragranular slip and corresponding stress redistribution, and cyclic strain ratcheting leading to high hydrostatic stresses and in turn hydrogen concentrations, which explains the locations of experimentally observed hydride formation. The interstitial hydrogen interaction energy as well as the intragranular geometrically necessary dislocation density were shown to be important in controlling the spatial distributions of observed hydrides.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79897502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Qu, R. Maaß, Zengqian Liu, D. Tönnies, L. Tian, R. Ritchie, Zhefeng Zhang, C. Volkert
Brittle materials, such as oxide glasses, are usually very sensitive to flaws, giving rise to a macroscopic fracture strength that is much lower than that predicted by theory. The same applies to metallic glasses (MGs), with the important difference that these glasses can exhibit certain plastic strain prior to catas- trophic failure. Here we consider the strongest metallic alloy known, a ternary Co 55 Ta 10 B 35 MG. We show that this macroscopically brittle glass is flaw-insensitive at the micrometer scale. This discovery emerges when testing pre-cracked specimens with self-similar geometries, where the fracture stress does not de- crease with increasing pre-crack size. The fracture toughness of this ultra-strong glassy alloy is further shown to increase with increasing sample size. Both these findings deviate from our classical under- standing of fracture mechanics, and are attributed to a transition from toughness-controlled to strength- controlled fracture below a critical sample size.
脆性材料，如氧化玻璃，通常对缺陷非常敏感，导致其宏观断裂强度远低于理论预测。这同样适用于金属玻璃(mg)，重要的区别是，这些玻璃在失营养衰竭之前可以表现出一定的塑性应变。这里我们考虑已知最强的金属合金，三元Co 55 Ta 10 B 35 MG。我们证明了这种宏观脆性玻璃在微米尺度上是缺陷不敏感的。这一发现出现在测试具有自相似几何形状的预裂试样时，其中断裂应力不会随着预裂尺寸的增加而减小。该合金的断裂韧性随试样尺寸的增大而增大。这两个发现都偏离了我们对断裂力学的经典理解，并归因于临界样本量以下从韧性控制断裂到强度控制断裂的转变。
{"title":"Flaw-Insensitive Fracture of a Micrometer-Sized Brittle Metallic Glass","authors":"R. Qu, R. Maaß, Zengqian Liu, D. Tönnies, L. Tian, R. Ritchie, Zhefeng Zhang, C. Volkert","doi":"10.2139/ssrn.3848993","DOIUrl":"https://doi.org/10.2139/ssrn.3848993","url":null,"abstract":"Brittle materials, such as oxide glasses, are usually very sensitive to flaws, giving rise to a macroscopic fracture strength that is much lower than that predicted by theory. The same applies to metallic glasses (MGs), with the important difference that these glasses can exhibit certain plastic strain prior to catas- trophic failure. Here we consider the strongest metallic alloy known, a ternary Co 55 Ta 10 B 35 MG. We show that this macroscopically brittle glass is flaw-insensitive at the micrometer scale. This discovery emerges when testing pre-cracked specimens with self-similar geometries, where the fracture stress does not de- crease with increasing pre-crack size. The fracture toughness of this ultra-strong glassy alloy is further shown to increase with increasing sample size. Both these findings deviate from our classical under- standing of fracture mechanics, and are attributed to a transition from toughness-controlled to strength- controlled fracture below a critical sample size.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84246039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An assembly line is a production process that divides labour by breaking up the manufacture of a product into steps that are completed in a pre-defined sequence Assembly lines were used in the late 1800s when workers used pulley systems to move products from one station to the next Henry Ford created the first moving assembly line, combining Olds' idea with conveyor belts, to mass-produce the Model T in 1913. The modern assembly line is used in many different industries, increasing output, cutting down costs, and boosting profits.
{"title":"Installation of Assembly Line in Most Economic Manner in Industry","authors":"Kaushal Ahirwar","doi":"10.2139/ssrn.3911368","DOIUrl":"https://doi.org/10.2139/ssrn.3911368","url":null,"abstract":"An assembly line is a production process that divides labour by breaking up the manufacture of a product into steps that are completed in a pre-defined sequence Assembly lines were used in the late 1800s when workers used pulley systems to move products from one station to the next Henry Ford created the first moving assembly line, combining Olds' idea with conveyor belts, to mass-produce the Model T in 1913. The modern assembly line is used in many different industries, increasing output, cutting down costs, and boosting profits.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76543626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The recent requirements in construction for lower energy consumption have accelerated the trend towards the use of high performance buildings. In these Nearly Zero Energy Buildings (NZEB), simple measures such as natural light control are practiced for maximising the light intake and minimising the heat gain, as required. These modern building envelopes interact with the external environment and are designed to respond to occupant demand, achieving the target energy efficiency and comfort needs. In these kinetic façades, shape morphing triggered by buckling is targeted for energy-saving structural applications. Among the structural forms that are suitable for such applications are thin plates, which are prone to buckling under small in-plane strains. This study presents a novel concept with application in shading control modules. In the proposed models, buckling of slender plates are configured to create a bistable mechanism with closed and open states. The proposed mechanism is simulated using finite element software to validate the feasibility of the core concept and to evaluate buckling as a reliable mechanism in kinetic façade control modules.
{"title":"Shading module with buckling as driver for shape morphing","authors":"M. Khezri, K. Rasmussen","doi":"10.2139/ssrn.3881757","DOIUrl":"https://doi.org/10.2139/ssrn.3881757","url":null,"abstract":"The recent requirements in construction for lower energy consumption have accelerated the trend towards the use of high performance buildings. In these Nearly Zero Energy Buildings (NZEB), simple measures such as natural light control are practiced for maximising the light intake and minimising the heat gain, as required. These modern building envelopes interact with the external environment and are designed to respond to occupant demand, achieving the target energy efficiency and comfort needs. In these kinetic façades, shape morphing triggered by buckling is targeted for energy-saving structural applications. Among the structural forms that are suitable for such applications are thin plates, which are prone to buckling under small in-plane strains. This study presents a novel concept with application in shading control modules. In the proposed models, buckling of slender plates are configured to create a bistable mechanism with closed and open states. The proposed mechanism is simulated using finite element software to validate the feasibility of the core concept and to evaluate buckling as a reliable mechanism in kinetic façade control modules.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91461416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-30DOI: 10.15587/2706-5448.2021.235421
V. Lebedev, T. Chumachenko, A. Bespalova, T. Nikolaeva, Y. Omelchenko
The object of research is the process of circular and surface grinding of titanium alloy and corrosion-resistant steel, namely, the cutting forces arising from mechanical processing. One of the most problematic areas in work is the selection of the required grinding modes, material and grinding wheel grain size.
In the course of the experiment, we used samples of VT8 titanium alloy and 12Х18N9T steel, on which the grinding process was studied with wheels made of various materials (electrocorundum, cubic boron nitride (CBN), diamond). The values of the cutting forces Py and Pz were obtained in the latitude of permissible modes, which are most often used in circular and flat grinding, and can reach maximum values, respectively, Py=27 N, Pz=15.5 N. The data were obtained at a low wheel speed from electrocorundum, about 15 m/s and grain size 8. By reducing the grain size of the wheel, we get the effect of increasing the energy consumption of the grinding process, due to the increase in the values of the cutting forces. If we compare the cutting forces arising from grinding with different wheels, then the following can be noted. Compared to electrocorundum wheels, when using CBN wheels, the cutting forces are reduced by 20–25 %, and when grinding with diamond wheels (despite the high wear of the diamond wheel), the effect of cutting forces is reduced by 25–30 %. This is due to the fact that cutting conditions are the most favorable for diamond and CBN grains, which makes it possible to use more intense cutting conditions.
The results of the study allow predicting the performance of the grinding wheel, reducing the energy consumption of production, and also adjusting the processing mode of the part to obtain the necessary quality indicators of the surface layer and the geometric dimensions of the part.
研究对象是钛合金和耐蚀钢的圆磨和面磨过程，即机械加工产生的切削力。工作中最棘手的问题之一是选择所需的磨削方式、材料和砂轮粒度。在实验过程中，我们以VT8钛合金和12Х18N9T钢为样品，对不同材料(电刚玉、立方氮化硼(CBN)、金刚石)的砂轮进行磨削过程研究。切削力Py和Pz的取值在圆磨和平磨中最常用的允许模态纬度上，分别可以达到最大值Py=27 N, Pz=15.5 N。数据是在低轮速下由电刚玉获得的，约为15 m/s，晶粒尺寸为8。通过减小砂轮的晶粒尺寸，由于切削力值的增加，我们得到了增加磨削过程能耗的效果。如果我们比较用不同的砂轮磨削所产生的切削力，那么可以注意到以下几点。与电刚玉砂轮相比，使用CBN砂轮时，切削力降低了20 - 25%，而使用金刚石砂轮磨削时(尽管金刚石砂轮磨损高)，切削力的效果降低了25 - 30%。这是由于切削条件对金刚石和CBN晶粒最有利，这使得使用更强的切削条件成为可能。研究结果可以预测砂轮的性能，降低生产能耗，还可以调整零件的加工方式，以获得必要的表面层质量指标和零件的几何尺寸。
{"title":"Analysis of Cutting Forces During Grinding of Titanium Alloy and Corrosion-Resistant Steel by Diamond, Electrocorundum and Cubic Borine Nitrid Wheels","authors":"V. Lebedev, T. Chumachenko, A. Bespalova, T. Nikolaeva, Y. Omelchenko","doi":"10.15587/2706-5448.2021.235421","DOIUrl":"https://doi.org/10.15587/2706-5448.2021.235421","url":null,"abstract":"The object of research is the process of circular and surface grinding of titanium alloy and corrosion-resistant steel, namely, the cutting forces arising from mechanical processing. One of the most problematic areas in work is the selection of the required grinding modes, material and grinding wheel grain size.<br><br>In the course of the experiment, we used samples of VT8 titanium alloy and 12Х18N9T steel, on which the grinding process was studied with wheels made of various materials (electrocorundum, cubic boron nitride (CBN), diamond). The values of the cutting forces Py and Pz were obtained in the latitude of permissible modes, which are most often used in circular and flat grinding, and can reach maximum values, respectively, Py=27 N, Pz=15.5 N. The data were obtained at a low wheel speed from electrocorundum, about 15 m/s and grain size 8. By reducing the grain size of the wheel, we get the effect of increasing the energy consumption of the grinding process, due to the increase in the values of the cutting forces. If we compare the cutting forces arising from grinding with different wheels, then the following can be noted. Compared to electrocorundum wheels, when using CBN wheels, the cutting forces are reduced by 20–25 %, and when grinding with diamond wheels (despite the high wear of the diamond wheel), the effect of cutting forces is reduced by 25–30 %. This is due to the fact that cutting conditions are the most favorable for diamond and CBN grains, which makes it possible to use more intense cutting conditions.<br><br>The results of the study allow predicting the performance of the grinding wheel, reducing the energy consumption of production, and also adjusting the processing mode of the part to obtain the necessary quality indicators of the surface layer and the geometric dimensions of the part.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75077993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The paper shows how to make the incremental-iterative solution significantly more efficient and robust in geometrically non-linear structural problems discretized via displacement-based finite element formulations. The main idea is to relax the constitutive equations at each integration point (IP) during the iterations. The converged solution remains unchanged while the iteration matrix is computed using independent IP stresses. This reduces the number of iterations to obtain convergence and allows very large steps in incremental analyses. The computational cost of each iteration is the same as the original Newton method. Importantly, the robustness of the iterative process is unaffected by high membraneto-flexural stiffness ratios as opposite to the standard Newton method.
{"title":"A robust and efficient iterative strategy for nonlinear analysis of structures subjected to buckling","authors":"D. Magisano, F. Liguori, L. Leonetti, G. Garcea","doi":"10.2139/ssrn.3868245","DOIUrl":"https://doi.org/10.2139/ssrn.3868245","url":null,"abstract":"The paper shows how to make the incremental-iterative solution significantly more efficient and robust in geometrically non-linear structural problems discretized via displacement-based finite element formulations. The main idea is to relax the constitutive equations at each integration point (IP) during the iterations. The converged solution remains unchanged while the iteration matrix is computed using independent IP stresses. This reduces the number of iterations to obtain convergence and allows very large steps in incremental analyses. The computational cost of each iteration is the same as the original Newton method. Importantly, the robustness of the iterative process is unaffected by high membraneto-flexural stiffness ratios as opposite to the standard Newton method.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81381312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. J. Bianco, A. Habtemariam, C. Könke, F. Tartaglione, V. Zabel
This paper presents alternative complementary shear and transversal elongation modes of Generalized Beam Theory (GBT) for thin-walled hollow circular cross-sections. It also compares them to the recent developments concerning membrane’s shear and transversal elongation. The main features of the alternative complementary modes are: i) despite of Poisson’s effect, each complementary mode is related to a clear membrane’s behavior: transversal elongation and shear deformation; ii) The coupling between these complementary modes is minimized, as well as the coupling between theses modes and the respective traditional GBT’s mode; iii) there is no coupling related to transversal stain energy either for membrane’s behavior, neither for plate’s behavior. To illustrate the presented alternative, complementary modes and its limitations, a detailed example applied in a short and deep pipe is carried out and its final results are compared not only with a full shell element model, but also with the recent developments in GBT.
{"title":"Alternative complementary shear and transversal elongation modes in Generalized Beam Theory (GBT) for thin‐walled circular cross‐sections","authors":"M. J. Bianco, A. Habtemariam, C. Könke, F. Tartaglione, V. Zabel","doi":"10.2139/ssrn.3868242","DOIUrl":"https://doi.org/10.2139/ssrn.3868242","url":null,"abstract":"This paper presents alternative complementary shear and transversal elongation modes of Generalized Beam Theory (GBT) for thin-walled hollow circular cross-sections. It also compares them to the recent developments concerning membrane’s shear and transversal elongation. The main features of the alternative complementary modes are: i) despite of Poisson’s effect, each complementary mode is related to a clear membrane’s behavior: transversal elongation and shear deformation; ii) The coupling between these complementary modes is minimized, as well as the coupling between theses modes and the respective traditional GBT’s mode; iii) there is no coupling related to transversal stain energy either for membrane’s behavior, neither for plate’s behavior. To illustrate the presented alternative, complementary modes and its limitations, a detailed example applied in a short and deep pipe is carried out and its final results are compared not only with a full shell element model, but also with the recent developments in GBT.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80918955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：