Method for predicting structural failure by strength-criterion-driven peridynamic model

    公开(公告)号:US11321503B2

    公开(公告)日:2022-05-03

    申请号:US17431433

    申请日:2020-12-01

    摘要: A method for predicting a structural failure by a strength-criterion-driven peridynamic model is provided. By building a peridynamic model driven by the strength-criterion of structural materials and then applying geometric and material parameters and working conditions of a structure, a life period from a deformation to a complete break of the structure is predicted. The method is of a high reliability, a wide application range, and a high calculation efficiency. The method simulates an initiation and a propagation of multiple cracks on complex structures under complex load conditions until the structure is destroyed.

    Method of structural cold working-residual compressive stress distribution quantitative matching design

    公开(公告)号:US11168380B2

    公开(公告)日:2021-11-09

    申请号:US17058644

    申请日:2020-07-09

    摘要: To solve the technical problem of the incapacity to perform a quantitative matching design of residual compressive stress in the process of prior structural cold working-residual compressive stress design, the invention provides a method of structural cold working-residual compressive stress distribution quantitative matching design, characterized by treating the fatigue strength of a mechanical structure and parts as a field, and matching a structural stress field and a fatigue strength field organically, to quantitatively match the residual compressive stress in conjunction with characteristics of the cold working process. The method specifically includes determination of the maximum stress amplitude and a gradient distribution thereof at a dangerous position of the structure, determination of an ideal fatigue strength distribution of the dangerous cross-section of the structure, determination of a fatigue strength field according to curves of end quenching tests for material and a requirement for heat treatment, determination of the limit of the residual compressive stress according to characteristics of the structural cold working process, and determination of an actual residual compressive stress distribution of the dangerous cross-section in conjunction with cold working and the fatigue strength distribution.