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    DUAL-CRITERION DIAGRAM METHODS FOR DESIGNING AND ASSESSING THE LIFE AND STRENGTH OF HIGH-TEMPERATURE ROTATING COMPONENTS
    3.
    发明申请
    DUAL-CRITERION DIAGRAM METHODS FOR DESIGNING AND ASSESSING THE LIFE AND STRENGTH OF HIGH-TEMPERATURE ROTATING COMPONENTS 审中-公开

    公开(公告)号：US20190170607A1

    公开(公告)日：2019-06-06

    申请号：US16236399

    申请日：2018-12-29

    Applicant: East China University of Science and Technology

    Inventor： Fuzhen Xuan

    IPC: G01M5/00 ,  G06F17/50

    Abstract: The disclosure relates to a dual-criterion diagram for designing and assessing the life and strength of high-temperature rotating components and its establishment. In addition, the disclosure relates to a method for designing and assessing the life and strength of high-temperature rotating components based on the dual-criterion diagram for designing and assessing the life and strength of high-temperature rotating components. The advantages of the disclosure include a simple design and assessment process, high operability, and reliable assessment results. The invention is expected to be applied finally to assessment and evaluation of high-cycle fatigue life of rotating components at high temperatures.

    Method of high-temperature nickel-based bolts based on damage tolerance theory
    4.
    发明授权
    Method of high-temperature nickel-based bolts based on damage tolerance theory 有权

    公开(公告)号：US10132732B2

    公开(公告)日：2018-11-20

    申请号：US15528241

    申请日：2016-06-01

    Applicant: East China University of Science and Technology ,  Shanghai Turbine Company LTD

    Inventor： Fuzhen Xuan ,  Jianping Tan ,  Jianguo Gong ,  Xia Liu

    IPC: G01N3/18 ,  G01N33/20 ,  B21H1/00 ,  F16B1/00 ,  G01M99/00

    Abstract: The invention relates to a design method of high-temperature nickel-based bolts based on damage tolerance theory, comprising the following steps: S1: acquiring operating parameters for the design; S2: selecting a material for bolts; S3: acquiring mechanical properties of the materials; S4: determining a pretension stress σp of a single bolt; S5: determining the service stress σs under the steady state; S6: determining the number n, the effective cross-section area A and the distribution of bolts; S7: determining a maximum allowable crack dimension; S8: calculating the maximum allowable service stress σth using the crack propagation threshold Kth at the design temperature; S9: comparing the service stress σs and the maximum allowable service stress σth, if σs is smaller than σth, then the bolts are safe in the design life; otherwise, return to step S4 and reduce the pretension stress σp.

    Creep strength analysis and assessment method and computer device
    6.
    发明授权
    Creep strength analysis and assessment method and computer device 有权

    公开(公告)号：US11320353B2

    公开(公告)日：2022-05-03

    申请号：US17286567

    申请日：2019-10-10

    Applicant: East China University of Science and Technology

    Inventor： Fuzhen Xuan ,  Tianye Niu ,  Jianguo Gong

    IPC: G01N3/18 ,  G01N3/24 ,  G01N25/72

    Abstract: A creep strength analysis and assessment method includes comparing whether a maximum value of a local strain and a membrane strain are less than a corresponding allowable strain, and if less, determining that a component is safe; otherwise, performing the following steps: performing stress linearization on a path to obtain a local primary membrane stress PL and a local primary bending stress Pb; averaging shear stress components on the path to obtain an average shear stress τm; obtaining a strength limit Smt, a time-independent minimum stress strength value Sm and a temperature- and time-dependent stress strength limit St for a given material, a design lifetime and a design temperature; comparing whether PL, PL+Pb and PL+Pb/Kt are less than Smt, KSm and St; and comparing whether τm is less than 0.6Sm and 0.6St, and if less, the component is safe, otherwise, the component is unsafe.

    CREEP STRENGTH ANALYSIS AND ASSESSMENT METHOD AND COMPUTER DEVICE
    7.
    发明申请
    CREEP STRENGTH ANALYSIS AND ASSESSMENT METHOD AND COMPUTER DEVICE 有权

    公开(公告)号：US20210341365A1

    公开(公告)日：2021-11-04

    申请号：US17286567

    申请日：2019-10-10

    Applicant: East China University of Science and Technology

    Inventor： Fuzhen Xuan ,  Tianye Niu ,  Jianguo Gong

    IPC: G01N3/18 ,  G01N3/24 ,  G01N25/72

    Abstract: A creep strength analysis and assessment method includes comparing whether a maximum value of a local strain and a membrane strain are less than a corresponding allowable strain, and if less, determining that a component is safe; otherwise, performing the following steps: performing stress linearization on a path to obtain a local primary membrane stress PL and a local primary bending stress Pb; averaging shear stress components on the path to obtain an average shear stress τm; obtaining a strength limit Smt, a time-independent minimum stress strength value Sm and a temperature- and time-dependent stress strength limit St for a given material, a design lifetime and a design temperature; comparing whether PL, PL+Pb and PL+Pb/Kt are less than Smt, KSm and St; and comparing whether τm is less than 0.6Sm and 0.6St, and if less, the component is safe, otherwise, the component is unsafe.

    CALIBRATION METHOD FOR THE BRITTLE FRACTURE ASSESSMENT PARAMETERS FOR MATERIALS BASED ON THE BEREMIN MODEL
    9.
    发明申请
    CALIBRATION METHOD FOR THE BRITTLE FRACTURE ASSESSMENT PARAMETERS FOR MATERIALS BASED ON THE BEREMIN MODEL 有权
    基于BEREMIN模型的材料脆性断裂参数的校准方法

    公开(公告)号：US20140372060A1

    公开(公告)日：2014-12-18

    申请号：US14365273

    申请日：2012-11-27

    Applicant: East China University of Science and Technology

    Inventor： Fuzhen Xuan ,  Yupeng Cao ,  Hu Hui ,  Penning Li ,  Guozhen Wang

    IPC: G01N3/62 ,  G01N3/40 ,  G06F17/50

    CPC classification number: G01N3/62 ,  G01N3/40 ,  G01N2203/0067 ,  G01N2203/021 ,  G01N2203/0218 ,  G06F17/5018

    Abstract: A calibration method for brittle fracture assessment parameters for pressure vessel materials based on the Beremin model includes selecting at least two types of specimens of different constraints, and calculating the fracture toughness values K0 corresponding to 63.2% failure probability for each type of specimens at a same calibration temperature by using the respective fracture toughness data. The method proceeds by obtaining the stress-strain curve of the material at the calibration temperature, generating finite element models for each type of specimens, and calculating the maximum principal stress and element volume of every element at K=K0 in each model. A series of values of m are assumed to compute a group of σu values for each type of specimens, and then m˜σu curves are plotted for each type of specimens. Brittle fracture assessment parameters are then determined for the material according to the coordinates of the intersection of the m˜σu curves.

    Abstract translation: 基于Beremin模型的压力容器材料的脆性断裂评估参数的校准方法包括选择不同约束条件的至少两种类型的试样，并计算相同于每种类型试样的63.2％失效概率的断裂韧性值K0 通过使用相应的断裂韧度数据来校准温度。 该方法通过在校准温度下获得材料的应力 - 应变曲线，为每种类型的样品生成有限元模型，并计算每个模型中K = K0处的每个元素的最大主应力和元素体积。 假设m的一系列值计算每种类型样本的一组＆sgr u值，然后对于每种类型的样本绘制m〜＆sgr; u曲线。 然后根据m〜＆ugr曲线的交点坐标确定材料的脆性断裂评估参数。

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