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Determination of Elastoplastic Mechanical Properties of the Weld and Heat Affected Zone Metals in Tailor-Welded Blanks by Nanoindentation Test

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Chinese Journal of Mechanical Engineering 2015年第5期28卷 911-918页

作者： MA Xiangdong GUAN Yingping YANG Liu Key Laboratory of Advanced Forming & Stamping Technology and Science of Ministry of Education Yanshan University

The elastoplastic mechanical properties of the weld and heat affected zone metals have comparatively major impact on the forming process of tailor-welded blanks. A few scholars investigated the elastoplastic mechanical properties of the weld and heat affected zone, but they only simply assumed that it was a uniform distribution elastoplastic material different from the base materials. Four types of tailor-welded blanks which consist of ST12 and 304 stainless steel plates are selected as the research objects, the elastoplastic mechanical properties of the tailor-welded blanks weld and heat affected zone metals are obtained based on the nanoindentation tests, and the Erichsen cupping tests are conducted by combining numerical simulation with physical experiment. The nanoindentation tests results demonstrate that the elastoplastic mechanical properties of the weld and heat affected zone metals are not only different from the base materials, but also varying between the weld metals and the heat affected zone metals. Comparing the Erichsen cupping test resulted from numerical with that from experimental method, it is found that the numerical value of Erichsen cupping test which consider the elastoplastic mechanical properties of the weld and heat affected zone metals have a good agreement with the experimental result, and the relative error is only 4.8%. The proposed research provides good solutions for the inhomogeneous elastoplastic mechanical properties of the tailor-welded blanks weld and heat affected zone metals, and improves the control performance of tailor-welded blanks forming accuracy.

关键词： tailor-welded blanks elastoplastic mechanical properties nanoindentation test Erichsen cupping test

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Precision and Flexible Bending Control Strategy Based on Analytical Models and Data Models

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 112-130页

作者： Yongchuan Duan Le Tian Fangfang Zhang Yu Liu Haidi Qiao Liu Yang Yingping Guan Key Laboratory of Advanced Forming&Stamping Technology and Science Ministry of Education of ChinaYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

forming of various customized bending parts,small batches,as well as numerous types of materials is a new challenges for Industry 4.0,the current control strategies can not meet the precision and flexibility requirement,expected control strategy of bending processes need to not only resist unknown interferences of process condition and models,but also produce various new parts automatically and *** this paper,a precision and flexible bending control strategy based on analytical models and data models is proposed to build adaptive bending *** analytical prediction models for loading and unloading are established and suitable for various materials,a sequential identification strategy is proposed to search nominal properties using the four sub-optimization models.A data-based feedback model is established to prevent over-bending and eliminate online *** models are merged into a precision and flexible control *** system firstly uses sub-optimization models to search the nominal point which is near to target point,secondly the system further uses feedback model to eliminate residual error between the nominal point and target *** with four kinds sheet metals,the allowable ranges for variables are determined for a good *** target bending angles were set to 20°,40°,and 60°.Forty parts were tracked for each kind material,the adaptive bending system converged after one iteration,and exhibited better performances.

关键词： Air bending Springback control Flexible bending control Feedback compensation

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An Iterative Compensation Algorithm for Springback Control in Plane Deformation and Its Application

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 212-223页

作者： Rui Ma Chunge Wang Ruixue Zhai Jun Zhao Key Laboratory of Advanced Forging & Stamping Technology and ScienceMinistry of Education of China Yanshan University College of Mechanical Engineering Yanshan University College of Mechanical and Energy Engineering Ningbo Institute of Technology Zhejiang University Key Laboratory of Roll Forming Technology Research

In order to solve the springback problem in sheet metal forming, the trial and error method is a widely used method in the factory, which is time-consuming and costly for its non-direction and non-quantitative. Finite element simulation is an e ective method to predict the springback of complex shape parts, but its precision is sensitive to the simulation model, particularly material model and boundary conditions. In this paper, the simple iterative method is introduced to establish the iterative compensation algorithm, and the convergence criterion of iterative parameters is put forward. In addition, the new algorithm is applied to the V-free bending and stretch-bending processes, and the convergence of curvature and bending angle is proved theoretically and verified experimentally. At the same time,the iterative compensation experiments for plane bending show that, the new method can predict the next compensaantido tnh ev atlaureg ebta cseurdv oatnu trhe ew sitphri tnhgeb earcrko ro fo fe laecshs ttehsat,n s0 o. 5 th%a ta rteh eo btatraigneet db aefntedri n2 g-3 a nitgelrea tiwoitnhs.t Thhei se rrreosre aorf clhe sps rtohpaons e±s 0 a.1%new iterative compensation algorithm to predict springback in sheet metal forming process, where each compensation value depends only on the iteration parameter di erence before and after springback for the same forming process of same material.

关键词： Springback control Iterative compensation algorithm Convergence criterion V-free bending Stretchbending

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Parameter calibration of anisotropic GTN model and forming limit for S600 aluminum alloy sheet

Engineering Research Express

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Engineering Research Express 2025年第2期7卷

作者： Chen, Xiaohua Wang, Zhanshan Zhang, Xuejian Dong, Guojiang Yang, Zhuoyun Yu, Shuang Wang, Yang Yang, Yiru Department of Mechanical and Electrical Engineering Suzhou Vocational Institute of Industrial Technology Suzhou 215104 China National-Local Joint Engineering Research Center for Advanced Manufacturing Forming Technology and Equipment Yanshan University Qinhuangdao 066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao 066004 China

High strength aluminum alloy sheet has obvious anisotropic characteristics and negligible necking in plastic deformation, making its fracture judgment in forming process more difficult than other metals. Taking S600 aluminum alloy sheet as the research object, a coupling model of anisotropic yield criterion and micro-damage theory namely Yld2000-GTN model was established, and its VUMAT subroutine was embedded into ABAQUS software in this study. The proposed model can improve the accuracy of fracture prediction for high-strength aluminum alloy sheet during plastic deformation. Uniaxial tension test and shear test were used to adjust the anisotropic parameters in Yld2000-GTN model. Uniaxial tension test was also employed to adjust damage parameters in Yld2000-GTN model with a new proposed method named sectional type parameter identification method (STPIM) basing on response surface method (RSM) and objective function method (OFM). However, these damage parameters could not accurately simulate the Force-Stroke curves of other notched samples with the highest error up to 18.94%. To correct this error, the relationship between stress triaxiality and damage parameters was further investigated and used to modify damage parameters. Taking the modified parameters into simulation, the prediction error of Force-Stroke curve for all notched samples was reduced to less than 5%. Finally, the theoretical forming limit diagram (FLD) of S600 aluminum alloy sheet was established by the modified parameters, and its accuracy was verified by the bulging test with hemispherical punch. © 2025 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

关键词： anisotropic yield criterion forming limit diagram micro-damage VUMAT subroutine Yld2000-GTN model

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Yield Characteristics Strengthening and Yield Strength Anti-Dispersion Identification Based on Bending Deformation

Research Square

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Research Square 2020年

作者： Duan, Yong-Chuan Qiao, Hai-Di Zhang, Fang-Fang Liu, Yu Tian, Le Yang, Liu Guan, Ying-Ping Key Laboratory of Advanced Forming & Stamping Technology and Science Ministry of Education of China Yanshan University Hebei Qinhuangdao066004 China College of Mechanical Engineering Yanshan University Hebei Qinhuangdao066004 China

The online derivation of material yield is important for consistency control of product quality. Compare with other deformation, bending deformation is more suitable for online identification. The transition portion of bending force stroke curve is related to the yield strength of material, but for a wide set of materials with different thickness and properties, its longer transition curve shows higher identification scattering. In this paper, the yield characteristics strengthening method and the new anti-dispersion identification method are studied to reduce the scattering. It is found that the yield characteristics are comprehensively affected by several factors. The higher yield strength, together with thinner thickness, can weaken the yield characteristics. The thicker material with wider die span can strengthen the yield characteristics. Window vector method (WV) and standardized fitting residual method (SFR) are proposed. Through the numerical study found that the yield load obtained by WV method shows a most accurate correlation with yield strength. A novel piecewise correlation equation is proposed and added a thickness variable to eliminate partial dispersion from varied thickness. Furthermore, this paper uses the experimental data to extract the generalization error of new correlation model fitted by yield loads from WV method, maximum error is below 12%. This method can improve the accuracy and efficiency of online ranking materials. © 2020, CC BY.

关键词： Yield stress

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Precision and Flexible Bending Control strategy Based on Analytical Models and Data Models

Research Square

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Research Square 2020年

作者： Duan, Yong-Chuan Zhang, Fang-Fang Liu, Yu Qiao, Hai-Di Yang, Liu Guan, Ying-Ping Key Laboratory of Advanced Forming & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao Hebei066004 China College of Mechanical Engineering Yanshan University Qinhuangdao Hebei066004 China

forming of various customized bending parts, small batches, as well as numerous types of materials is a new challenges for Industry 4.0, the current control strategies can not meet the precision and flexibility requirement, expected control strategy of bending processes need to not only resist unknown interferences of process condition and models, but also produce various new parts automatically and efficiently. In this paper, a precision and flexible bending control strategy based on analytical models and data models is proposed to built adaptive bending systems. New analytical prediction models for loading and unloading are established and suitable for various materials, a sequential identification strategy is proposed to search nominal properties using the four sub-optimization models. A data-based feedback model is established to prevent over-bending and eliminate online deviation. Above models are merged into a precision and flexible control strategy. the system firstly uses sub-optimization models to search the nominal point which is near to target point, secondly the system further uses feedback model to eliminate residual error between the nominal point and target point. Compared with four kinds sheet metals, the allowable ranges for variables are determined for a good convergence. The target bending angles were set to 20°, 40°, and 60°. Forty parts were tracked for each kind material, the adaptive bending system converged after one iteration, and exhibited better performances. © 2020, CC BY.

关键词： Analytical models

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A through process modeling using multi-assistant software applied to radial fatigue life predication of a 356-T6 wheels

Research Square

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Research Square 2020年

作者： Duan, Yong-Chuan Zhang, Fang-Fang Tian, Le Guan, Ying-Ping Hu, Jin-Hua Key Laboratory of Advanced Forming & Stamping Technology and Science Ministry of Education of China Yanshan University Hebei Qinhuangdao066004 China College of Mechanical Engineering Yanshan University Hebei Qinhuangdao066004 China Technical Center CITIC Dicastal Limited company Hebei Qinhuangdao066004 China

In order to solve the problem of isolated design in multi-process using multi-assistant software, a through-software radial fatigue life prediction model was established, the effects of shrinkage cavity, SDAS and mean stress on fatigue life were considered. The casting process of the aluminum alloy wheel was simulated based on ProCast, and the data of SDAS and porosity of different parts were predicted based on the solidification process;The data mapping algorithm between tetrahedral mesh elements was developed to realize the unidirectional transformation of microcosmic data from a cast model to a static mechanical model, the radial loading mechanical analysis model of a wheel containing microcosmic information was established;The fatigue life prediction model was established by Fesafe based on the specific mechanical and fatigue parameters of each node. Based on the self-developed TCD software, the integrated coupling method of the three software prediction models was realized. The application of this method on the virtual fatigue prediction experiment of unidirectional tensile specimen reduce the result dispersion between virtual and physical experiment, and the predicted life result error is reduced from 51% to 16%. The proposed method lays a solid foundation of the optimization design and lightweight design of aluminum alloy wheels. © 2020, CC BY.

关键词： Wheels

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Enhanced Identification of Damage Evolution in Two-Dimensional Woven Laminated Materials Through Multimodal Information Fusion of Acousto-Optic-Force Data

SSRN

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SSRN 2024年

作者： Zhang, Fangfang Xiao, Yang Duan, Yongchuan Xiao, Yuangan Wu, Honglin Zhu, Song Key Laboratory of Advanced Forming & Stamping Technology and Science Ministry of Education of China Yanshan University Hebei Qinhuangdao066004 China College of Mechanical Engineering Yanshan University Hebei Qinhuangdao066004 China Chongqing Hongjiang Machinery Co. Ltd. Chongqing402160 China

Non-destructive testing is a widely used inspection method for the safe maintenance of large composite structures. Acoustic signals and optical images, etc, are indirectly associated with damage. However, the complex damage modes of composites and the specific usage scenarios cause limitations, such as a modal signal that is stage-sensitive and selection-sensitive to the damage mode. This study proposes an advanced method to analyze the evolution of damage in composite materials using multimodal information fusion for enhanced identification while mitigating dispersion of recognition results. First, a experimental system is established with a synchronous data sampling logic. By combining mechanical, acoustic, and optical signals, we obtained a three-stage characteristic association of damage initiation, evolution, and instability of unidirectional stretching and three-point bending. Damage initiation identification was facilitated by distinguishability of the typical features, followed by combining the load and acoustic emission. The damage instability was determined by combining the optical and load signals. By combining the acoustic and load signals, the three damage modes and their corresponding peak frequency ranges were determined. Multimodal signals were combined to determine the association rules, laying a theoretical foundation for the reliable identification of multimodal and incomplete model damage in composites. © 2024, The Authors. All rights reserved.

关键词： Information fusion

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A Mechanical Model of Internal Expansion Over Bending and Calibration (Ieobc) Process For Large-Diameter Pipe End

SSRN

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SSRN 2024年

作者： Qi, Shaocong Yu, Gaochao Shi, Zhaocheng Zhang, Zifeng Han, Yashuai Zhao, Feiping Li, Senlin Zhao, Jun Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China China Department of Mechanical Engineering Imperial College London LondonSW7 2AZ United Kingdom National-Local Joint Engineering Research Center for Advanced Manufacturing Forming Technology and Equipment Yanshan University China Hebei Engineering Technology Research Center of Metal Precision Plastic Processing Yanshan University China Nantong Chaoli Rolling Machine Producing Co. Ltd Nantong China

In the process of laying urban pipeline networks, it is necessary to cut the pipes, and the residual stress of the cut pipes is released, resulting in an increase in the ovality of the cut section. Therefore, roundness calibration of the pipe ends is required. The internal expansion over bend and calibration (IEOBC) process is an efficient technique used for on-site calibration of the ovality of pipe ends. To accurately analyze the deformation behavior of pipe ends and improve its ovality, the mechanical model of the IEOBC process is established based on the static equilibrium equation, elastic-plastic deformation physical equation, deformation coordination equation, and constraint equation, which can be regarded as a statically indeterminate problem. The variation law of the ovality in the pipe end cross-section during the calibration process is analyzed. A control strategy for pipe end IEOBC process was proposed based on the functional relationship between the ovality and relative displacement. Calibration experiments are conducted on a mobile intelligent calibration machine. After the IEOBC process, the pipe end cross-section with initial ovality of 2.31% and 2.69% was reduced to 0.18% and -0.31%, respectively, meeting the pipe specification of API SPEC 5L. The IEOBC process and the control strategy proposed in this study can be applied to the roundness calibration of pipe end cross-section during pipe installation. © 2024, The Authors. All rights reserved.

关键词： Expansion

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