Method suitable for predicting cyclic load deformation behaviors in multiple control modes
A technology of cyclic load and control mode, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, measuring devices, special data processing applications, etc., to achieve the effect of simple determination process and easy operation
Active Publication Date: 2021-12-03
NANJING UNIV OF TECH
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Problems solved by technology
It is currently difficult to find a reasonable constitutive model to describe the deformation behavior under such complex control modes
In addition, there is no method that can describe and predict multiple control mode cyclic loads (low-cycle fatigue load, strain-controlled creep fatigue load, stress-strain mixed-controlled creep fatigue load, stress-controlled ratchet creep load) through a set of parameters. deformation behavior under
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[0063] The selected material is P92 steel, a high-temperature martensitic heat-resistant steel commonly used in power plants, and three cycle tests are carried out at 650 °C according to step S1. According to the standard [National Standard GB / T 26077-2010], the strain-controlled low-cycle fatigue test is carried out, the strain amplitude is ±0.4%, and the strain rate is 1×10 -3 ; Follow the standard [National Standard GB / T 38822-2020] to implement the strain-controlled creep fatigue test, the strain amplitude is ±0.4%, and the strain rate is 1×10 -3 , apply tensile load, and the load time is 180s; follow the literature [Zhang T, Wang X, Ji Y, et al.Cyclic deformation and damage mechanisms of 9% Crsteel under hybrid stress-strain controlled creep fatigue interactionloadings[J]. International Journal of Fatigue,2021,151:106357.] Implemented stress-strain mixed control creep fatigue test under two load states, the fatigue part of the strain control of the two tests is the same, ...
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The invention discloses a method suitable for predicting cyclic load deformation behaviors in multiple control modes, which comprises the following steps: taking four samples made of the same material, and carrying out a low-cycle fatigue test, a strain controlled creep fatigue test and a stress-strain mixed controlled creep fatigue test at the same temperature to obtain corresponding data; establishing a unified viscoplastic constitutive model, comprising strain decomposition, a flow rate, hardening in all directions and the same direction and movement hardening of the unified viscoplastic constitutive model; on the basis of the test data, simplifying the proposed unified viscoplastic constitutive model step by step, and finally determining all model parameters; and determining a final unified viscoplastic model by using the determined model parameters, and predicting the deformation behavior of the same material under the cyclic load of other multiple control modes by using the model. The method has the advantages of being easy to operate, high in precision and wide in applicability, and deformation behaviors under various cyclic loads can be predicted at the same time through one set of parameters.
Description
technical field [0001] The invention relates to the fields of constitutive models and cyclic deformation prediction, in particular to a method suitable for predicting the deformation behavior of cyclic loads in various control modes. Background technique [0002] The constitutive model is a theoretical method used to describe various inelastic deformation behaviors of materials under cyclic loading, such as cyclic hardening, cyclic softening, creep deformation, stress relaxation, etc. In recent years, with the rapid development of computer technology, the secondary development of the constitutive model through large-scale finite element software can monitor the deformation behavior and damage distribution of the actual loaded parts in real time. However, this advanced technology puts forward higher requirements on the accuracy and universality of the constitutive model. [0003] Although some relatively mature constitutive models have been developed, such as Chaboche model,...
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IPC IPC(8): G06F30/20G16C60/00G16C10/00G01N3/32G06F119/04
CPCG06F30/20G16C60/00G16C10/00G01N3/32G01N2203/0005G01N2203/0073G01N2203/0075G01N2203/0682G06F2119/04Y02T90/00
Inventor 王小威张天宇周德文姜勇张显程巩建鸣涂善东
Owner NANJING UNIV OF TECH