A Damage Life Evaluation Method for Fatigue Crack Initiation and Propagation Based on Crystal Plasticity
A technology for fatigue crack and life assessment, applied in the field of metal sheet metal forming, can solve the problem of inability to quantitatively and intuitively calculate fatigue crack initiation and propagation behavior, and achieve important scientific significance and engineering application value, good compatibility and portability Effect
Active Publication Date: 2021-07-27
SICHUAN UNIV +1
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[0004] Aiming at the above-mentioned deficiencies in the prior art, a damage life evaluation method based on crystal plasticity of fatigue crack initiation and propagation provided by the present invention solves the problem that the behavior of fatigue crack initiation and propagation cannot be quantitatively and intuitively calculated
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[0048] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0049] Such as figure 1 As shown, a damage life assessment method for fatigue crack initiation and growth based on crystal plasticity includes the following steps:
[0050] S1. According to CT metal specimens, construct a mesoscale grid calculation model of microstructure information;
[0051] S2. Calculate the shear strain increment according to the mesoscale grid calculation model, and construct the mesoscale material co...
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The invention discloses a method for evaluating damage life of fatigue crack initiation and propagation based on crystal plasticity, which comprises the following steps: S1. Constructing a mesoscale grid calculation model of microstructure information according to CT metal specimens; S2. Mesoscale grid calculation model, calculate the shear strain rate increment, and construct the mesoscale material constitutive model; S3, based on the mesoscale material constitutive model, construct the crack growth driving force model; S4, based on the crack growth driving force model , build a fatigue damage model based on energy, and evaluate the damage life; the invention solves the problem that the fatigue crack initiation and propagation behavior cannot be quantitatively and intuitively calculated.
Description
technical field [0001] The invention relates to the technical field of metal sheet metal forming, in particular to a damage life evaluation method based on crystal plasticity of fatigue crack initiation and propagation. Background technique [0002] The crack initiation and propagation behavior of materials is directly related to the fatigue failure performance. Studies have shown that crack initiation occupies most of the fatigue life cycle, while the propagation behavior is easily affected by the material microstructure including crystal interface, slip, etc. Therefore, crack initiation and propagation has always been a research hotspot and one of the bottlenecks restricting the application of materials engineering. [0003] The traditional detection of fatigue crack behavior is based on standard CT specimens tested in crack growth testing equipment. This method is mainly aimed at the crack growth process, but the detection of crack initiation process is relatively rough,...
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IPC IPC(8): G01N23/046
CPCG01N23/046G01N2223/03G01N2223/607G01N2223/646
Inventor 张宏张玮王林森王清远刘永杰李浪何超王宠
Owner SICHUAN UNIV