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.

公开(公告)号：US20170315036A1

公开(公告)日：2017-11-02

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

CPC classification number: G01N3/18 ,  B21H1/00 ,  F16B1/00 ,  F16B5/0275 ,  G01M99/00 ,  G01N33/20

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.